DSU III DBU
Data Service Unit
USER MANUAL
Part Number Version
1200037L1 Switched 4-Wire Version
1202037L1 Switched 4-Wire Version Second Generation
1200037L2 V.32 Version
1202037L2 V.32 Version Second Generation
1200037L3 Switched 2-Wire Version
1202037L3 Switched 2-Wire Version Second Generation
1200037L4 ISDN Version
1202037L4 ISDN Version Second Generation
1202037L5 V.34 Version
61200.037L1-1G
July 1997
Trademark:
DATAPATH is a registered trademark of CAE electronics and is used by Northern
Telecom under license.
Hayes is a registered trademark of Hayes Microcomputer Products, Inc.
901 Explorer Boulevard
P.O. Box 140000
Huntsville, AL 35814-4000
Phone: (205) 963-8000
© 1997 ADTRAN, Inc.
All rights reserved.
Printed in USA.
FCC regulations require that the following information be provided in this manual:
1. This equipment complies with Part 68 of the FCC rules. On the bottom of the equipment
housing is a label that shows the FCC registration number and ringer equivalence number
(REN) for this equipment. If requested, provide this information to the telephone company.
2. If this equipment causes harm to the telephone network, the telephone company may temporarily
discontinue service. If possible, advance notification is given, otherwise, notification is given
as soon as possible. The telephone company will advise the customer of the right to file a
complaint with the FCC.
3. The telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the proper operation of this equipment; advance notification and
the opportunity to maintain uninterrupted service is given.
4. If experiencing difficulty with this equipment, please contact ADTRAN for repair and
warranty information. The telephone company may require this equipment to be
disconnected from the network until the problem is corrected, or it is certain the equipment is
not malfunctioning.
5. This unit contains no user-serviceable parts.
6. An FCC compliant telephone cord with a modular plug is provided with this equipment. In
addition, an FCC compliant cable appropriate for the dial backup option ordered is provided
with this equipment. This equipment is designed to be connected to the telephone network or
premises wiring using an FCC compatible modular jack, which is Part 68 compliant.
7. The following information may be required when applying to the local telephone company for
leased line facilities:
Service Digital Facility Service Order Network
Type Interface Code Code Jacks
2.4 kbps Digital Interface 04DU5-24 6.0F RJ-48S
4.8 kbps Digital Interface 04DU5-48 6.0F RJ-48S
9.6 kbps Digital Interface 04DU5-96 6.0F RJ-48S
19.2 kbps Digital Interface 04DU5-19 6.0F RJ-48S
38.4 kbps Digital Interface 04DU5-38 6.0F RJ-48S
56 kbps Digital Interface 04DU5-56 6.0F RJ-48S
64 kbps Digital Interface 04DU5-64 6.0F RJ-48S
8. The following information may be required when applying to the local telephone company for
a dial-up line for the V.34 or V.32:
Service REN FIC USOC
Type
Loop Start (V.32) 0.3B 02LS2 RJ-11C
Loop Start (V.34) 0.8B 02LS2 RJ-11C
9. The REN is useful in determining the quantity of devices you may connect to your telephone
line and still have all of those devices ring when your number is called. In most areas, the sum
of the RENs of all devices should not exceed five. To be certain of the number of devices you
may connect to your line as determined by the REN, call your telephone company to
determine the maximum REN for your calling area.
10.This equipment may not be used on coin service provided by the telephone company.
Connection to party lines is subject to state tarriffs. (Contact your state public utility
commission or corporation commission for information.)
Table of Contents
FEDERAL COMMUNICATIONS COMMISSION
RADIO FREQUENCY INTERFERENCE STATEMENT
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio frequencies. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to correct the interference at his own expense.
Shielded cables must be used with this unit to ensure compliance with Class A FCC limits.
Change or modifications to this unit not expressly approved by the
party responsible for compliance could void the user's authority to
operate the equipment.
CANADIAN EMISSIONS REQUIREMENTS
This digital apparatus does not exceed the Class A limits for radio noise emissions
from digital apparatus as set out in the interference-causing equipment standard
entitled "Digital Apparatus," ICES-003 of the Department of Communications.
Cet appareil nuerique respecte les limites de bruits radioelectriques applicables aux
appareils numeriques de Class A prescrites dans la norme sur le materiel brouilleur:
"Appareils Numeriques," NMB-003 edictee par le ministre des Communications.
Table of Contents
CANADIAN EQUIPMENT LIMITATIONS
Notice: The Canadian Industry and Science Canada label identifies certified
equipment. This certification means that the equipment meets certain telecommunications network protective, operational, and safety requirements. The
Department does not guarantee the equipment will operate to the user's satisfaction.
Before installing this equipment, users should ensure that it is permissible to be
connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some
cases, the company's inside wiring associated with a single line individual
service may be extended by means of a certified connector assembly (telephone
extension cord). The customer should be aware that compliance with the above
conditions may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian
maintenance facility designated by the supplier. Any repairs or alterations made
by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe
system, if present, are connected together. This precaution may be particularly
important in rural areas.
Caution: Users should not attempt to make such connections themselves, but
should contact the appropriate electric inspection authority, or an electrician, as
appropriate.
The Load Number (LN) assigned to each terminal device denotes the percentage
of the total load to be connected to a telephone loop which is used by the device,
to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all devices does not exceed 100.
ISDN Service Ordering Information for the ADTRAN DSU III DBU With ISDN Dial
Backup
For ADTRAN DSU III DBU ISDN applications, the following guide can be used as
an aid in ordering basic ISDN service from your local telephone company. The
ADTRAN DSU III DBU ISDN includes NT1 and Terminal adapter functionality and
supports data rates up to 64 kbps.
Request an ISDN Basic Rate Interface (BRI) line with the following features:
U-interface reference point
2B1Q line coding
1B+D Service (supports up to 64 kbps)
The DSU III DBU ISDN supports the following switch types and software
protocols:
AT&T 5ESS Custom, 5E6 and later software, National ISDN-1
NT1 DMS-100 BCS-32 and later software (Pvc1), National ISDN-1 (Pvc2)
Siemens EWSD National ISDN-1
Request that the ISDN line allocate one DYNAMIC Terminal Endpoint Identifier
(TEI) for the number.
For service offered from an AT&T 5ESS, request a point-to-point line with the
following features:
Feature: Value
B1 Service: On Demand (DMD)
Data Line Class: Point-to-Point
Maximum B Channels: 1 (1B+D)
Circuit Switched Data (CSD) Bearer Channels: Any
Number of CSD Calls: 1 (1B+D)
Terminal Type: Type A
Turn the Following Features Off:
Packet Mode Data
Multi-line Hunt
Multiple Call Appearances
Electronic Key Telephone Sets (EKTS)
Shared Dictionary Numbers
Accept Special Type of Number
Intercom Groups
Network Resource Selector (Modem Pools)
Message Waiting
Hunting
InterLata Competition
For service offered from a Northern Telecom DMS-100, request a Point-to-Point
Multi-Point line with the following features:
Line Type: Basic Rate, Functional
Electronic Key Telephone Sets (EKTS): No
Call Appearance Handling (CACH): No
Non-Initializing Terminal: No
Circuit Switched Service: Yes
Packet Switched Service: No
TEI: Dynamic
Bearer Service: Circuit Switched voice and data permitted on any B channel (packet mode
data not permitted)
Table of Contents
Table of Contents
Table of Contents
Chapter 1. Introduction
Product Overview .................................................................................................................. 1
DDS Operation........................................................................................................................ 3
Dial Backup Operation .......................................................................................................... 4
Dial Backup Options ....................................................................................................... 4
4-Wire Switched 56 Backup Option....................................................................... 4
2-Wire Switched 56 Backup Option....................................................................... 4
V.32 bis Backup Option ........................................................................................... 4
V.34 Backup Option ................................................................................................. 5
1B+D Basic Rate ISDN Backup Option ................................................................. 5
Entering Dial Backup Mode........................................................................................... 5
Operation During Critical Times ........................................................................... 5
Loss of Sealing Current .................................................................................... 5
Out of Service (OOS) Signal ............................................................................ 6
No Receive Signal ............................................................................................. 6
All 1s or all 0s Condition.................................................................................. 6
Operation During Noncritical Times .................................................................... 6
Conditions for Returning to the DDS Circuit.............................................................. 6
Warranty and Customer Service........................................................................................... 7
Chapter 2. Installation
Unpack, Inspect, Power Up ........................................................................................... 9
Receipt Inspection ........................................................................................................... 9
ADTRAN Shipments Include................................................................................. 9
Customer Provides................................................................................................... 9
Power Up ........................................................................................................................10
Network Interface Connection ........................................................................................... 10
DTE Data Connection/Primary DTE .................................................................................11
Secondary Channel Connection ......................................................................................... 13
Configuration ........................................................................................................................ 15
Configuration Methods ................................................................................................ 15
AT Commands............................................................................................................... 16
V.25 bis Commands ...................................................................................................... 17
SDLC Option........................................................................................................... 17
Character Format ............................................................................................ 17
Command Structure ....................................................................................... 17
61200.037L1-1 DSU III DBU User Manual i
Table of Contents
Bi-Sync Option........................................................................................................ 17
Character Format ............................................................................................ 17
Command Structure ....................................................................................... 17
Asynchronous Option ........................................................................................... 18
Character Format ............................................................................................ 18
Command Structure ....................................................................................... 18
Command Descriptions......................................................................................... 18
Syntax and Possible Responses ............................................................................ 19
CNL (Configuration Local)............................................................................ 19
CNR (Configuration Remote) ....................................................................... 19
Remote Command......................................................................................................... 19
Chapter 3. Operation
Menu Structure .............................................................................................................. 21
Main Menu ..................................................................................................................... 21
Status................................................................................................................. 21
Test .................................................................................................................... 22
Configuration (CONFIG) ............................................................................... 22
Dial .................................................................................................................... 22
Basic Menu Navigation ................................................................................................ 22
Front Panel............................................................................................................................. 23
LCD Window................................................................................................... 24
Enter .................................................................................................................. 24
Numeric Keypad ............................................................................................. 24
Shift ................................................................................................................... 24
Quick................................................................................................................. 25
Cancel ............................................................................................................... 25
Up and Down Arrows .................................................................................... 25
LED Description .............................................................................................. 25
Rear Panel .............................................................................................................................. 26
Chapter 4. Configuration Overview
Local and Remote Configuration ....................................................................................... 29
Chapter 5. Configuring Network Options
Network Options .................................................................................................................. 33
Loop Rate........................................................................................................................ 35
Network Address .......................................................................................................... 36
Remote Configuration .................................................................................................. 36
Clock Source................................................................................................................... 37
ii DSU III DBU User Manual 61200.037L1-1
Table of Contents
Chapter 6. Configuring DTE Options
DTE Options .......................................................................................................................... 39
DTE Rate ......................................................................................................................... 39
Connector Type ............................................................................................................. 42
Data Format.................................................................................................................... 43
DTE Command Option................................................................................................. 44
Transmit Clock............................................................................................................... 45
Clear to Send (CS) Options .......................................................................................... 46
Anti -Stream ................................................................................................................... 48
CD Options..................................................................................................................... 49
Data Terminal Ready (TR) Options ............................................................................ 50
Data Set Ready (SR) Options ....................................................................................... 51
Secondary Rate .............................................................................................................. 52
Chapter 7. Configuring Test Options
Test Options ........................................................................................................................... 55
Test Timeout................................................................................................................... 56
Remote Digital Loopback (RDL) ................................................................................. 56
EIA LLB........................................................................................................................... 57
EIA RLB .......................................................................................................................... 57
DBU Answer Test .......................................................................................................... 58
Chapter 8. Configuring Dial Options
Dial Options .......................................................................................................................... 59
Phone Number............................................................................................................... 61
ISDN Dial Backup .................................................................................................. 61
Setting the Service Profile Identifier (SPID) ................................................ 61
Setting the Local Directory (LOC) Number ................................................ 62
DBU Options for All Models ....................................................................................... 63
Automatic DBU ............................................................................................... 63
Number to Dial................................................................................................ 63
Originate/Answer .......................................................................................... 63
When Out of Service (OOS)........................................................................... 63
No Receive (RX) Signal .................................................................................. 63
No Sealing Current ......................................................................................... 63
When all 1s/0s................................................................................................. 64
Auto Restore .................................................................................................... 64
Redial Counter................................................................................................. 64
Fail Timer.......................................................................................................... 64
Wait to Redial................................................................................................... 65
61200.037L1-1 DSU III DBU User Manual iii
Table of Contents
DBU Options for 2-wire and 4-wire............................................................................ 66
Network Type .................................................................................................. 66
DBU Options for V.32 bis and V.34 ........................................................................... 66
Error Control.................................................................................................... 66
Flow Control .................................................................................................... 66
Compression .................................................................................................... 66
DBU Options for ISDN ................................................................................................. 68
Switch Type...................................................................................................... 68
DBU Passcode ................................................................................................................ 68
Chapter 9. Dial Options
Dial Options .......................................................................................................................... 69
Answer Unit Connected to DDS Line ........................................................................ 70
Dial Backup...................................................................................................... 70
Originate Unit Connected to DDS Line...................................................................... 70
Dial Backup...................................................................................................... 70
Stay on Leased ................................................................................................. 70
DBU Online Test.............................................................................................. 70
Dial Options During Dial Backup........................................................................ 70
Hang Up ........................................................................................................... 70
Stay On Line..................................................................................................... 70
Chapter 10. Status
Status ...................................................................................................................................... 71
Network Rate, DTE Rate, and Data Format .............................................................. 71
Dial Backup Information .............................................................................................. 72
Type of Dial Backup Service .......................................................................... 72
Current Status of Dial Backup Mode ........................................................... 72
DSU Operation and Network Status .......................................................................... 74
Current DSU III DBU Status ................................................................................. 74
Current DDS Network Status............................................................................... 74
DTE Control Leads and Status .................................................................................... 75
Chapter 11. Testing and Troubleshooting
Test Overview........................................................................................................................ 77
Initiating a Test .............................................................................................................. 78
Test Status Display ........................................................................................................ 79
Exiting a Test ..................................................................................................................79
Troubleshooting .................................................................................................................... 81
Messages from the DSU/CSU ..................................................................................... 81
iv DSU III DBU User Manual 61200.037L1-1
Table of Contents
Troubleshooting New Installs ..................................................................................... 82
Test Sequence for Troubleshooting New Installs or Existing Circuits ........... 83
Local Unit Diagnostics ......................................................................................................... 84
DTE & Loop (LL) ........................................................................................................... 86
Test Description...................................................................................................... 86
Test Purpose............................................................................................................ 86
Initiating .................................................................................................................. 87
Interpreting Test Results ....................................................................................... 87
Loop Only (RT) .............................................................................................................. 88
Test Purpose............................................................................................................ 88
Initiating .................................................................................................................. 88
Interpreting Test Results ....................................................................................... 89
DTE Only ........................................................................................................................90
Test Purpose............................................................................................................ 90
Initiating .................................................................................................................. 90
Interpreting Test Results ....................................................................................... 91
DTE With Test Pattern .................................................................................................. 92
Test Purpose............................................................................................................ 92
Initiating .................................................................................................................. 92
Interpreting Test Results ....................................................................................... 93
Test Pattern..................................................................................................................... 94
Test Purpose............................................................................................................ 94
Initiating .................................................................................................................. 95
Interpreting Test Results ....................................................................................... 95
Self Test ........................................................................................................................... 96
Test Purpose............................................................................................................ 96
Initiating .................................................................................................................. 96
Interpreting Test Results ....................................................................................... 96
Remote Unit Diagnostics ..................................................................................................... 97
Test Purpose............................................................................................................ 97
Initiating .................................................................................................................. 98
Test Results ............................................................................................................. 98
Interpreting Test Results ....................................................................................... 98
DBU Connection ................................................................................................................... 99
Test Purpose............................................................................................................ 99
Initiating ................................................................................................................ 100
Interpreting Test Results ..................................................................................... 100
Chapter 12. Manual Command
Manual Command.............................................................................................................. 101
61200.037L1-1 DSU III DBU User Manual v
Table of Contents
Appendix A. AT Commands .......................................................................................... 105
Appendix B. Default Configuration Profiles
Default Configuration Profiles ......................................................................................... 109
Profile 1........................................................................................................... 109
Profile 2........................................................................................................... 109
Profiles 3 and 4 .............................................................................................. 109
Appendix C. DSU to Modem Interconnect
Modem Tail Circuit Application ........................................................................................113
Appendix D. EIA-232 Connector
56 and 64 kbps Application................................................................................................115
Appendix E. Specifications Summary
Specification and Features..................................................................................................117
Operating Modes ...........................................................................................117
Data Rates........................................................................................................117
DTE Rates ........................................................................................................117
DTE Interface Data Rates ..............................................................................117
FCC Approval.................................................................................................117
DTE Interfaces ................................................................................................118
Data Buffering ................................................................................................118
Clocking...........................................................................................................118
Diagnostics ......................................................................................................118
Line Requirements .........................................................................................118
Line Interface ..................................................................................................118
Receiver Sensitivity........................................................................................118
Environment ...................................................................................................118
Physical............................................................................................................118
Power ...............................................................................................................118
Glossary ................................................................................................................................119
Index ..................................................................................................................................... 127
List of Tables
Table 2-A Pin Assignments for Line 1 Connector ........................................................ 10
Table 2-B Pin Assignments for Line 2 Connector .........................................................11
Table 2-C Pin Assignments for Primary EIA-232 Connector ..................................... 12
vi DSU III DBU User Manual 61200.037L1-1
Table of Contents
Table 2-D Pin Assignments for Primary V.35 Connector ............................................ 13
Table 2-E Pin Assignments for Auxiliary EIA-232 Connector ................................... 14
Table 5-A Network Options AT Commands ................................................................. 34
Table 6-A DTE Rate Options AT Commands ................................................................ 41
Table 6-B Data Format Commands................................................................................ 43
Table 6-C Transmit Clock AT Commands..................................................................... 45
Table 6-D CS Options AT Commands ............................................................................ 47
Table 6-E Short and Long Delays at Different Operating Speeds ............................. 47
Table 6-F Anti-Stream AT Commands .......................................................................... 49
Table 6-G CD Options AT Commands ........................................................................... 50
Table 6-H TR Options AT Commands ........................................................................... 51
Table 6-I SR Options AT Commands ............................................................................ 52
Table 6-J Secondary Rate AT Commands ................................................................... 53
Table 7-A Test Options AT Commands.......................................................................... 55
Table 8-A AT Commands for Storing Phone Numbers ............................................... 62
Table 8-B DBU Options AT Commands for All Models ............................................. 65
Table 8-C DBU Options AT Commands for V.32 bis and V.34 Backup ..................... 67
Table 11-A Messages from the DSU/CSU....................................................................... 81
Table 11-B Troubleshooting New Installs ....................................................................... 82
Table 11-C Test AT Commands......................................................................................... 84
Table 11-D DTE with Test Pattern Commands ............................................................... 85
Table 11-E Remote Tests and AT Commands ................................................................. 97
Table 12-A Manual Commands ...................................................................................... 103
Table A-A A T Commands............................................................................................... 105
Table B-A Default Configuration Profiles.....................................................................110
List of Figures
Figure 1-1 Typical Point-to-Point Application for DSU III DBU ................................. 2
Figure 3-1 Example of Basic Menu Navigation ........................................................... 23
Figure 3-2 DSU III DBU Front View .............................................................................. 24
Figure 3-3 DSU III DBU Rear View ............................................................................... 27
Figure 4-1 Complete Configuration Menu ................................................................... 31
Figure 5-1 Setting Loop Rate Options ........................................................................... 35
Figure 5-2 Setting the Network Address ...................................................................... 36
Figure 5-3 Remote Configuration .................................................................................. 36
Figure 5-4 Setting the Clock Source ............................................................................... 37
Figure 6-1 Selecting DTE Rates ...................................................................................... 40
Figure 6-2 Selecting the Connector Type ...................................................................... 42
Figure 6-3 Selecting Asynchronous or Synchronous Data Format ........................... 43
Figure 6-4 Selecting DTE Command Option ............................................................... 44
61200.037L1-1 DSU III DBU User Manual vii
Table of Contents
Figure 6-5 Transmit Clock Options................................................................................ 45
Figure 6-6 Selecting CS Options ..................................................................................... 46
Figure 6-7 Anti-Stream Options ..................................................................................... 48
Figure 6-8 Selecting CD Options .................................................................................... 49
Figure 6-9 Selecting Data Terminal Ready (TR) Options ........................................... 50
Figure 6-10 Setting Data Set Ready (SR) Options .......................................................... 51
Figure 6-11 Setting the Secondary Rate .......................................................................... 52
Figure 7-1 Setting Test Timeout Option ........................................................................ 56
Figure 7-2 Remote Digital Loopback ............................................................................. 56
Figure 7-3 EIA Local Loopback Options....................................................................... 57
Figure 7-4 EIA Remote Loopback Options ................................................................... 57
Figure 7-5 DBU Answer Test Option............................................................................. 58
Figure 8-1 Dial Backup Options ..................................................................................... 60
Figure 8-2 Editing Stored Phone Numbers .................................................................. 61
Figure 9-1 Dial Options Menu........................................................................................ 69
Figure 10-1 Status Display ................................................................................................ 71
Figure 11-1 Normal Operation Before Initiating Loopback Test................................. 77
Figure 11-2 Initiating a Test .............................................................................................. 78
Figure 11-3 Sample Test Status Displays ........................................................................ 79
Figure 11-4 Complete Test Menu..................................................................................... 80
Figure 11-5 DTE & Loop Test ........................................................................................... 86
Figure 11-6 Initiating a DTE & Loop Test....................................................................... 87
Figure 11-7 Loop Only Test............................................................................................... 88
Figure 11-8 Initiating a Loop Only Test .......................................................................... 89
Figure 11-9 DTE Only Test Diagram ............................................................................... 90
Figure 11-10 Initiating a DTE Only Test............................................................................ 91
Figure 11-11 DTE with Test Pattern................................................................................... 92
Figure 11-12 Initiating a DTE with Test and Test Pattern ............................................... 93
Figure 11-13 Test Pattern Only ........................................................................................... 94
Figure 11-14 Initiating a Test Using a Test Pattern.......................................................... 95
Figure 11-15 Initiating a Self Test ....................................................................................... 96
Figure 11-16 V.54 RDL with Test Pattern .......................................................................... 97
Figure 11-17 Initiating a Remote Test................................................................................ 98
Figure 11-18 DBU Connection Test.................................................................................... 99
Figure 11-19 Initiating a DBU Connection Test ............................................................. 100
Figure 12-1 Manual Command ...................................................................................... 102
Figure C-1 DSU to Modem Interconnect ......................................................................113
Figure D-1 EIA-232 Connector .......................................................................................115
viii DSU III DBU User Manual 61200.037L1-1
PRODUCT OVERVIEW
The ADTRAN DSU III DBU (dial backup data service unit)
provides a reliable, high-speed data connection for customer
data terminal equipment (DTE) through digital data service
(DDS) lines. The DSU III DBU provides automatic dial backup
of the dedicated circuit. There are five backup options available:
4-wire switched 56 (SW56), 2-wire SW56, V.32 bis/42 bis, V.34,
and 1B+D ISDN. The DSU III DBU supports both synchronous
and asynchronous data communication over the DDS or DBU
networks.
Chapter 1. Introduction
Chapter 1
Introduction
The DSU III DBU provides both V.35 and EIA-232 electrical and
physical DTE interfaces to accommodate a variety of applications. A second EIA-232 interface is provided if the unit is
configured for use on DDS with secondary channel services.
To ensure a reliable connection, the unit features an extended
receiver capability which permits operation over long loops
(3.4 miles or 5.5 km of 26 AWG at 56 kbps).
The 4-wire SW56 DBU model is compatible with AT&T Accunet
and Sprint SW56 type services. The 2-wire SW56 DBU is compatible with DATAPATH® type of SW56 services. The V.32 bis/
42 bis DBU and the V.34 DBU allow switched backup over the
public switched telephone network (PSTN). The 1B+D ISDN
model is compatible with National ISDN and supports a Uinterface to the Basic Rate ISDN.
61200.037L1-1 DSU III DBU User Manual 1
Chapter 1. Introduction
Figure 1-1 shows a typical point-to-point application for the DSU
III DBU.
PCs
RINTER
P
BRIDGE/ROUTER
Local
Area
Network
SERVER
DEDICATED
PRIVATE NETWORK
POWER SUPPLYPOWER SUPPLY POWER SUPPLYPOWER SUPPLY
+5V+5V
+12V+12V
-12V-12V
-5V
CHECK
DSU III ARDSU III AR DSU III ARDSU III AR DSU III ARDSU III AR DSU III ARDSU III AR DSU III S4WDSU III S4W DSU III S4WDSU III S4W DSU III S4WDSU III S4W DSU III DBUDSU III DBUDSU III S4WDSU III S4W DSU III DBUDSU III DBU DSU III DBUDSU III DBU DSU III DBUDSU III DBU DSU S2WDSU S2W DSU S2WDSU S2W DSU S2WDSU S2W
SHELF
CONTROLLER
RS
RS
RS
RS
CS
CS
CS
CS
TD
TD
TD
TD
RD
RD
RD
RD
CD
CD
CD
CD
ALM
ALM
ALM
ALM
DTE
DTE
DTE
DTE
LOOP
LOOP
LOOP
LOOP
RDL
RDL
RDL
RDL
PTRN
PTRN
PTRN
PTRN
ERROR
ERROR
ERROR
ERROR
DIALMATE
DIAL STATUS
CANCEL
TEST CONFIG ENTER
SELECT
SELECT
SELECT
SELECT
TEST
TEST
TEST
TEST
1 2 3
4 5 6
7 8 9
0
1 1622 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515
2 or 4-wire
SW56
PUBLIC SWITCHED
DIGITAL NETWORK
2 or 4-wire
SW56
DSU III DBU
ENTER
RS CS TD RD CD ALM TSTRS CS TD RD CD ALM TST
CANCEL
DSU III DBU
Typical Point-to-Point Application for DSU III DBU
+5V+5V
+12V+12V
-12V-12V
-5V
RS
CS
TD
RD
CD
ALM
DTE
LOOP
RDL
PTRN
ERROR
SELECT
TEST
CHECK
RS
RS
RS
RS
RS
RS
RS
RS
RS
CS
CS
CS
TD
TD
TD
RD
RD
RD
CD
CD
CD
ALM
ALM
ALM
DTE
DTE
DTE
LOOP
LOOP
LOOP
RDL
RDL
RDL
PTRN
PTRN
PTRN
ERROR
ERROR
ERROR
SELECT
SELECT
SELECT
TEST
TEST
TEST
RS
CS
CS
CS
CS
CS
CS
CS
TD
TD
TD
TD
TD
TD
TD
RD
RD
RD
RD
RD
RD
RD
CD
CD
CD
CD
CD
CD
CD
ALM
ALM
ALM
ALM
ALM
ALM
ALM
DTE
DTE
DTE
DTE
DTE
DTE
DTE
LOOP
LOOP
LOOP
LOOP
LOOP
LOOP
LOOP
RDL
RDL
RDL
RDL
RDL
RDL
RDL
PTRN
PTRN
PTRN
PTRN
PTRN
PTRN
PTRN
ERROR
ERROR
ERROR
ERROR
ERROR
ERROR
ERROR
SELECT
SELECT
SELECT
SELECT
SELECT
SELECT
SELECT
TEST
TEST
TEST
TEST
TEST
TEST
TEST
S
MART 16 SHELF
V.32 bis
ISDN
NETWORK
PUBLIC SWITCHED
TELEPHONE NETWORK
V.32 bis
P
RINTER
PCs
Local
Area
1 2 3
DAEBF
4 5 6
7 8 9
SHIFT SHIFT
*
C
#0
BRIDGE/ROUTER
Network
SERVER
Figure 1-1
2 DSU III DBU User Manual 61200.037L1-1
DDS OPERATION
Chapter 1. Introduction
DDS is a nationwide service that allows interconnection and
transport of data at speeds up to 64 kbps. The local exchange
carriers provide the local loop service to DDS customers and
may provide data for routing Inter-LATA to an interexchange
carrier. In DDS mode, the DSU III DBU supports the 56/64 kbps
DDS service rate yielding DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4
(sync or async), 56 kbps, and 64 kbps. An additional rate of 57.6
is available in asynchronous mode. The unit can be configured
to run slower DTE rates (async or sync) over the 56 kbps service.
Secondary channel operation is supported at all service rates up
to 56 kbps, providing terminal rates of 75, 150, 300, 600, 1200,
and 2400 bps. The secondary rates available depend on the
service rate configured.
61200.037L1-1 DSU III DBU User Manual 3
Chapter 1. Introduction
DIAL BACKUP OPERATION
There are five backup options available: 4-wire SW56, 2-wire
SW56, V.32 bis/42 bis,V.34, and 1B+D ISDN. Contact the local
telco provider to determine which services are available.
Dial Backup Options
4-Wire Switched 56 Backup Option
This dial-up 4-wire DDS allows customers to pay for data
connection only for the time the unit is active. The regional
operating companies provide the 4-wire local loop service to
SW56 customers. In SW56 mode, the DSU III DBU supports
DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4 (asynchronous or synchronous), and 56 kbps (synchronous). An additional DTE rate of
57.6 kbps is available in async modes.
2-Wire Switched 56 Backup Option
DATAPATH is a switched digital service offered under various
service names by the local service provider. The services are
generally provided by the Northern Telecom DMS/SL100 family
of central office switches. DATAPATH allows the customer to
pay for high speed data transfer, up to 56 kbps, only when the
unit is active. The dial-up service is delivered via a 2-wire local
loop that can be up to 18,000 feet at a signal level of -45 dB.
V.32 bis Backup Option
The V.32 bis/42 bis modem in an asynchronous mode can use
V.42 bis data compression to make up for a slower connection
rate. V.42 bis increases the effective data throughput from 14.4
kbps to as high as 57.6 kbps, depending on the data type. No
compression is supported in synchronous operation. In synchronous applications the maximum speed supported for backup is
14.4 kbps.
4 DSU III DBU User Manual 61200.037L1-1
V.34 Backup Option
The V.34 modem has all of the V.32 bis modem's modes of
operation, plus V.34 and V.FC modes. This allows the V.34
option to run synchronous rates up to 28.8 kbps as opposed to
the V.32 at 14.4 kbps. In asynchronous mode the throughput at
57.6 kbps is less dependent on data types.
1B+D Basic Rate ISDN Backup Option
1B+D Basic Rate ISDN service provides the customer with a
switched 56/64 kbps circuit. The default data rate for this option
is 56K. The 64 kbps data rate may be revised by using the
SMART dial string as described in the section ISDN Dial Backup
in the chapter Configuring Dial Options. This option provides a U
interface to the ISDN network.
Entering Dial Backup Mode
When a condition for entering dial backup mode is detected, the
Alarm LED turns on, and the buzzer sounds. The buzzer
alternates between 30 seconds on and 30 seconds off unless the
DDS line is restored or it is disabled by using the Quick key and
selecting Turn Off Beep. See the section Front Panel in the
chapter Operation for more information on the Quick key.
Chapter 1. Introduction
Operation During Critical Times
The following four conditions will cause a DSU III DBU to enter
dial backup mode:
Loss of Sealing Current
Sealing current is a low voltage DC current provided by the
central office (CO) to prevent corrosion over the copper wires
used in the local loop. Sealing current may also be used for local
loop testing purposes. An absence of sealing current generally is
an indication that the loop is open.
61200.037L1-1 DSU III DBU User Manual 5
Chapter 1. Introduction
Out of Service (OOS) Signal
An OOS signal, generated by the network, indicates a device (or
devices) in the network is out of service.
No Receive Signal
This is an indication that the local loop copper pairs may be
either open or shorted or the OCU in the CO is inoperative. In a
private network this may indicate that the transmitter of the
remote DSU is inoperative.
All 1s or all 0s Condition
This condition is usually generated by the network to indicate
some device (or devices) in the network is inoperative. Upon
detecting an all 1s or all 0s condition, the DSU III DBU initiates a
handshake routine to determine whether the remote unit's DTE
is the source of the all 1s or 0s condition or if an actual network
failure exists.
Operation During Noncritical Times
The DSU III DBU may be configured not to enter dial backup
mode if data terminal ready (DTR) is low. This feature prevents
the DSU III DBU from entering dial backup during noncritical
times such as nights and weekends.
For more information, see the chapter Configuring Dial Backup
Options.
Conditions for Returning to the DDS Circuit
The DSU III DBU can be configured to automatically revert to
the DDS circuit from the dial backup mode or wait to be returned to the DDS manually. Once the DSU III DBU enters dial
backup mode, the unit polls the DDS circuit once every 100 ms to
determine if the condition causing the DDS circuit failure has
been corrected. Once the DSU III DBU determines that the
problem has been properly corrected and the DDS circuit is
stable, it will wait for the amount of time specified in the restore
timer (1 - 255 minutes) before reverting to the DDS circuit.
Polling of the DDS circuit is non-intrusive and return to the DDS
6 DSU III DBU User Manual 61200.037L1-1
circuit generally takes 2 - 3 seconds. The backup connection is
maintained for one minute after the DDS circuit is restored.
For more information see the chapter Configuring Dial Backup
Options.
WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within five years
from the date of shipment if it does not meet its published
specifications or fails while in service. For detailed warranty,
repair and return information refer to the ADTRAN Equipment
Warranty and Repair and Return Policy Procedure.
Return Material Authorization (RMA) is required prior to
returning equipment to ADTRAN.
For service, RMA requests, or further information, contact one of
the numbers listed on the inside back cover of this manual.
Chapter 1. Introduction
61200.037L1-1 DSU III DBU User Manual 7
Chapter 1. Introduction
8 DSU III DBU User Manual 61200.037L1-1
UNPACK, INSPECT, POWER UP
Receipt Inspection
Carefully inspect the DSU III DBU for any shipping damage. If
damage is suspected, file a claim immediately with the carrier
and contact ADTRAN Customer Service. If possible, keep the
original shipping container for use in shipping the DSU III DBU
for repair or for verification of damage during shipment.
Chapter 2. Installation
Chapter 2
Installation
ADTRAN Shipments Include
The following items are included in ADTRAN shipments of the
DSU III DBU:
• DSU III DBU unit
• An 8-position modular to 8-position modular cable
• The user manual
• Appropriate cable for the backup option selected
Customer Provides
The customer must provide an EIA-232 interface cable with
standard 25-pin male D-type connectors (Cannon or Cinch DB19604-432) or a V.35 cable.
61200.037L1-1 DSU III DBU User Manual 9
Chapter 2. Installation
Power Up
Each DSU unit is provided with a captive eight-foot power cord,
terminated by a three-prong plug which connects to a grounded
115 VAC power receptacle.
Power to the DSU must be provided from a grounded 115 VAC, 60 Hz
receptacle.
NETWORK INTERFACE CONNECTION
The DSU III DBU has two eight-position modular jacks labelled
LINE 1 and LINE 2. The line 1 connector is used for connecting
to the dedicated (DDS) network. The pinout for the line 1
connector is listed in Table 2-A.
Pin Name Description
1 R1 Transmit Data from DSU to Network-Ring 1
2 T1 Transmit Data from DSU to Network-Tip 1
3-6 - Not Used
7 T Receive Data from Network to DSU-Tip
8 R Receive Data from Network to DSU-Ring
Table 2-A
Pin Assignments for Line 1 Connector
The line 2 connector is used for connection to the switched
backup network. The pinout for the line 2 connector depends on
the model of DBU unit. Pinouts for 4-wire Switched 56, 2-wire
Switched 56, V.32 bis, V.34, and 1B+D ISDN DBU options are
shown in Table 2-B.
10 DSU III DBU User Manual 61200.037L1-1
Pin Name Description
4-wire Switched 56
1 R1 Transmit Data from DSU to Network-Ring 1
2 T1 Transmit Data from DSU to Network-Tip 1
3-6 - Not Used
7 T Receive Data from Network to DSU-Tip
8 R Receive Data from Network to DSU-Ring
2-wire Switched 56, V.32 bis, V.34, and 1B+D ISDN
1-3 - Not Used
4 T Network-Tip
5 R Network-Ring
6 - 8 - Not Used
DTE DATA CONNECTION/PRIMARY DTE
The primary DTE should be connected to either the EIA-232 DTE
connector or the CCITT V.35 DTE connector. The maximum
cable lengths recommended are 50 feet for the EIA-232, and 100
feet for the CCITT V.35. The pin assignments for the connectors
are listed in Tables 2-C and 2-D.
Chapter 2. Installation
Table 2-B
Pin Assignments for Line 2 Connector
The V.35 connector is recommended for use with data rates
above 19.2 kbps. The EIA-232 connector works up to 56 kbps
with a low capacitance cable or with the external transmit clock
option selected. The primary DTE rate is configured from the
front panel. The primary DTE equipment can operate in asynchronous or synchronous modes.
To prevent possible radio frequency interference emissions, a shielded
cable is required.
61200.037L1-1 DSU III DBU User Manual 11
Chapter 2. Installation
Table 2-C
Pin Assignments for Primary EIA-232 Connector
Pin E I A Description
1 AA Protective Ground (PG)
2 BA Transmit Data (SD)
3 B B Receive Data (RD)
4 CA Request-to-Send (RS)
5 CB Clear-to-Send (CS)
6 C C Data Set Ready (SR)
7 AB Signal Ground (SG)
8 CF Received Line Signal Detector (CD)
9 - +12 Test Point
10 - -12 Test Point
15 D B Transmit Clock (TC)
17 DD Receive Clock (RC)
18 - Local Loopback (LL)
20 CD Data Terminal Ready (TR)
21 - Remote Loopback (RL)
22 CE Ring Indicator (RI)
24 DA External TX Clock (ETC)
25 - Test Indicator (TI)
12 DSU III DBU User Manual 61200.037L1-1
Chapter 2. Installation
)
)
Table 2-D
Pin Assignments for Primary V.35 Connector
Pin CCITT Description
A 101 Protective Ground (PG)
B 102 Signal Ground (SG)
C 105 Request to Send (RTS)
D 106 Clear To Send (CTS)
E 107 Data Set Ready
F 109 Received Line Signal Detector (CD)
H - Data Terminal Ready (DTR)
J - Ring Indicator (RI)
L - Local Loopback (LL)
N - Remote Loopback (RL)
R 104 Received Data (RD-A)
T 104 Received Data (RD-B)
V 115 Receiver Signal Element Timing (SCR-A)
X 115 Receiver Signal Element Timing (SCR-B)
P 103 Transmitted Data (SD-A)
S 103 Transmitted Data (SD-B)
Y 114 Transmitter Signal Element Timing (SCT-A
AA 114 Transmitter Signal Element Timing (SCT-B
U 113 External TX Signal Element (SCX-A)
W 113 External TX Signal Element (SCX-B)
NN - Test Indicator (TI)
SECONDARY CHANNEL CONNECTION
If used, the secondary DTE should be connected to the auxiliary
EIA-232 connector. The pinout for the connector is shown in
Table 2-E.
61200.037L1-1 DSU III DBU User Manual 13
Chapter 2. Installation
Table 2-E
Pin Assignments for Auxiliary EIA-232 Connector
Pin CCITT Description
1 AA Protective Ground (PG)
2 B A Transmit Data (SD)
3 BB Receive Data (RD)
4 CA Request to Send (RS)
5 C B Clear to Send (CS)
6 C C Data Set Ready (SR)
7 AB Signal Ground (SG)
8 CF Carrier Detect (CD) - on all the time
14 DSU III DBU User Manual 61200.037L1-1
CONFIGURATION
The DSU III contains four different user profiles (sets of configuration options) that are stored in read-only memory. These
profiles are listed in the appendix Default Configuration Profiles.
The unit is shipped from the factory with profile 1 (default
configuration) loaded into the nonvolatile configuration
memory. If profile 1 matches the desired system requirements,
then no additional configuration is required to put the unit into
service. If profile 1 does not match the desired system requir ements, modify the default configuration or select another profile
more closely matching the desired configuration and modify.
When a new profile is loaded or the existing profile is modified,
it is stored in the nonvolatile configuration memory. The DSU III
DBU is then configured with that profile every time power is
turned on or the unit is reset.
See the chapter Manual Command for information on loading
default configuration profiles.
Configuration Methods
Chapter 2. Installation
The DSU III DBU provides three methods for local configuration
and three different methods for remote configuration: AT
commands, V.25 commands, and front panel commands.
61200.037L1-1 DSU III DBU User Manual 15
Chapter 2. Installation
AT Commands
In addition to the front panel, the DSU III DBU can be configured and controlled with in-band AT commands from an asynchronous DTE port just as modems are.
To exit the data mode and enter the command mode, the asynchronous DTE device must transmit a proper escape sequence of
three pluses (+++) to the DSU III DBU. A specified time delay
must occur between the last data character and the first escape
sequence character. This is the guard time delay, and it can be
changed by writing a value to the S12 register. The default value
for the guard time is one second. For a valid escape sequence to
occur, the DTE must transmit the escape code character three
times in succession with delay between each character being less
than the guard time.
Once the command mode is entered, AT commands can be
transmitted to the DSU III DBU to configure most of the options
or initiate tests to check both the DSU III DBU and the network
connections. All command lines must begin with the AT character set in either capital or lower case letters.
The command line may contain a single command or a series of
commands after the AT attention code. When a series of commands is used, the individual commands may be separated with
spaces for readability. The maximum length for a command line
is 40 characters. Each command line is executed by the DSU III
DBU upon receipt of a terminating character. The default
terminating character is a carriage return (ASCII 013), but it can
be changed by writing a different value to register S3.
Before the terminating character is transmitted, the command
line can be edited by using the backspace character (ASCII 008)
to erase errors so the proper commands can be entered.
Valid AT commands for the DSU III DBU are listed in the appendix AT Commands.
16 DSU III DBU User Manual 61200.037L1-1
V.25 bis Commands
When configured for the V.25 bis option, the DSU III DBU
accepts in-band dialing and configuration commands from both
synchronous and asynchronous DTE ports.
The V.25 bis option supports the following protocols:
• SDLC
• Bi-Sync
• Asynchronous
SDLC Option
Character Format
• Data bits - 8
• Parity bit - Ignored
Command Structure
[F][A][C][V.25 bis COMMAND][FCS][F]
The address field [A] is FFH. The control field [C] is set to 13H
except for cases of multi-frame responses. For this case, the
control field is set to 03H in all but the last frame. The 03H in the
control field indicates that other frames are to follow while the
13H in the control field indicates the final frame.
Chapter 2. Installation
Bi-Sync Option
Character Format
• Data bits - 7
• Parity bit - Odd
Command Structure
[SYN][SYN][STX][V.25 bis COMMAND][ETX]
61200.037L1-1 DSU III DBU User Manual 17
Chapter 2. Installation
Asynchronous Option
Command Descriptions
Character Format
• Start bit - 1
• Data bits - 7
• Parity bit - Even
• Stop bit - 1
Command Structure
[V.25 bis COMMAND][CR][LF]
The ADTRAN V.25 bis command set is a subset of the CCITT
V.25 bis command set. In addition to the CCITT commands
supported, ADTRAN has added configuration commands for
both local and remote DSUs. The ADTRAN V.25 bis command
set follows:
CNL Configuration local
CNR Configuration remote
Possible responses to V.25 bis commands follows:
VALA Valid V.25 command processed
INV An invalid command detected
INVCU Unknown command detected
INVPS Invalid parameter syntax
INVPV Invalid parameter value
INVBL Invalid local password
INVBM Invalid remote password
If verbose responses are disabled (ATV0), the following threecharacter responses are the only ones returned:
VAL Valid V.25 command processed
INV Invalid command received
18 DSU III DBU User Manual 61200.037L1-1
Syntax and Possible Responses
CNL (Configuration Local)
This command is used to pass AT commands to the local DSU
via the V.25 bis command processor. This allows the DSU III
DBU to be configured with AT commands using a synchronous
interface. The format is as follows:
CNL[LOCAL PASSWORD];AT[ONE OR MORE AT COMMANDS]
A local password may not be required depending on the present
configuration of the unit. Responses to CNL commands are
returned in the data format currently configured. Possible
responses include: VALA and INVAn.
CNR (Configuration Remote)
This command is used to pass AT commands over the network
to the remote DSU via the V.25 bis command processor. This
allows a remote DSU III DBU to be configured from a synchronous interface. The format of this command follows:
CNR[REMOTE PASSWORD];AT[ONE OR MORE AT COMMANDS]
Chapter 2. Installation
The remote password may or may not be required depending on
the present configuration of the remote unit. Responses to the
CNR commands are returned in the data format currently
configured. Possible responses include: VAL and INVAn.
Remote Command
The DSU III DBU can be controlled remotely from another DSU
III DBU. The Configuration (CONFIG) menu allows the DSU III
DBU remote configuration capability to be enabled or disabled.
For more information, see the chapter Configuration Overview.
61200.037L1-1 DSU III DBU User Manual 19
Chapter 2. Installation
20 DSU III DBU User Manual 61200.037L1-1
MENU STRUCTURE
The DSU III DBU uses a multilevel menu approach to access its
many features. All menu operations are displayed in the LCD
window.
The opening menu is the access point to all other operations.
Each Main menu item has several functions and submenus to
identify and access specific parameters.
Chapter 3. Operation
Chapter 3
Operation
LCD display of the Main menu:
1=STATUS 2=TEST
3=CONFIG 4=DIAL
Main Menu
There are four branches of the main menu: Status, Test, Configuration (CONFIG), and Dial.
Status
Status is used to display all relevant information for the network
and DTE interfaces. It displays the current operating data mode,
loop status, DTE data rate and format, and DTE interface lead
status. The system returns to the status display when idle.
61200.037L1-1 DSU III DBU User Manual 21
Chapter 3. Operation
Test
Test is used to control local and remote testing. Select local or
remote testing, and the type of test and test pattern when
required.
Configuration (CONFIG)
Configuration is used to select network and DTE operating
parameters. When certain loop rates (56 or 64 kbps) are selected,
a scramble option submenu is displayed instead of the DTE Rate
menu to control scrambling.
Dial
Dial provides manual dialing functions. Key in a number to dial
or select one of the ten stored numbers.
Basic Menu Navigation
Four function keys on the left side of the DSU III DBU keypad
allow the various menu branches to be entered, exited, and
scrolled through. The four function keys are defined below:
Enter Selects a displayed item.
Up Arrow Scrolls up a menu tree.
Down Arrow Scrolls down a menu tree.
Cancel Exits (back one level) from the current
branch of the menu.
To choose a menu item, press the corresponding number or
alpha character on the keypad (press Shift to activate menu
items with alpha selections). The item flashes on and off to show
it is the currently selected (active) choice. Pressing either the Up
or Down Arrow scrolls through the available menu items. Press
Enter to select the item.
22 DSU III DBU User Manual 61200.037L1-1
Chapter 3. Operation
The following example and Figure 3-1 illustrate how to select the
DSU III DBU loop rate options:
1. Select Configuration (CONFIG) by pressing 3, then press
Enter.
2. Select LOCAL or REMOTE configuration by pressing the
corresponding number , then press Enter.
3. Use the Up and Down Arrows to view submenu items.
4. Choose an item on the submenu such as Network Options
(NETWORK OPT).
5. To select NETWORK OPT press 1, then press Enter.
6. To select LOOP RATE options, press 1, then press Enter.
1=LOOP RATE
1=LOCAL 1=NETWORK OPT. 2=NETWORK ADDR.
3=CONFIG 2=DTE OPTIONS 3=REMOTE CONFIG
2=REMOTE 3=TEST OPTIONS 4=CLOCK SOURCE
4=DIAL OPTIONS
5=MANUAL COMMAND
Figure 3-1
Example of Basic Menu Navigation
FRONT PANEL
The DSU III DBU faceplate is shown in Figure 3-2.
61200.037L1-1 DSU III DBU User Manual 23
Chapter 3. Operation
DSU III DBU
RS CS TD RD CD ALM TST
The following function descriptions apply to both the standalone unit and the rackmount unit when using the DATAMATE
modules.
LCD Window
The LCD window displays menu items and messages in 2 lines
by 16 characters.
Enter
Enter selects active menu items. To activate a menu item, press
the number of the item. When the menu item is flashing (active),
press Enter to select it. A submenu item is invoked or a configu-
ration parameter is set. The display of COMMAND AC-
CEPTED indicates a valid operation.
ENTER
CANCEL
A
1
45ED6
789
SHIFT QUICK
*
B
2
0
C
3
F
#
Figure 3-2
DSU III DBU Front View
Numeric Keypad
The numeric keypad contains the numbers 0 through 9 and
alpha characters A through F, which are used to activate menu
items. Numbers 0 through 9 are also used to enter parameters.
Shift
Alpha characters are entered by pressing Shift before each
desired character.
To activate a menu item designated by an alpha character rather
than a number, display the menu item using the Up and Down
Arrows; press and release Shift, then press the letter. Press
Enter to select the item.
24 DSU III DBU User Manual 61200.037L1-1
Chapter 3. Operation
If a key is pressed without using Shift, the numbered item
becomes active instead of the alpha item. If this happens, repeat
the correct procedure.
Quick
The Quick key used during most operations returns immediately to the Main menu. During a test, the Quick key displays
the Exit Test screen. During dial backup, Quick displays a menu
with options to Hang Up or Stay on the Line.
Cancel
Cancel stops the current activity and returns to the previous
menu. Repeat until the desired menu level is reached. When a
submenu item is displayed, press Cancel to exit the current
display and return to the previous menu. Repeat as necessary.
Up and Down Arrows
Up and Down Arrows scroll through the submenu items avail-
able in the current menu. Submenu items appear two at a time
in a circular or wrapping fashion. When the submenu items are
scrolled, they continuously appear from beginning to end in a
forward (Down Arrow) or reverse (Up Arrow) pattern.
LED Description
The DSU III DBU has seven LED indicators: RS, CS, TD, RD,
CD, ALM, and TST. These LEDs are identified as follows:
RS: Request to Send Reflects the status of the request to send
pin of the EIA-232 connector.
CS: Clear to Send Reflects the status of the clear to send
pin of the EIA-232 connector.
TD: Transmit Data This LED is active when data is trans-
mitted from the DTE.
RD: Receive Data This LED is active when data is received
from the network.
61200.037L1-1 DSU III DBU User Manual 25
Chapter 3. Operation
CD: Carrier Detect This LED is active when frame synchro-
nization is achieved and the DSU III
DBU is ready to transfer data.
REAR PANEL
ALM: Alarm Indication
This LED activates whenever an alarm
condition exists. Alarm conditions
include:
• Open loop on network
• No frame synchronization
• Unit in dial backup
• Problem on dial backup line
TST: Test Mode This LED is on whenever the unit is in
test mode.
The rear panel contains three DTE connectors which provide
primary channel V.35 or EIA-232, and a secondary channel EIA232 port (auxiliary EIA -232). An 8-pin telco jack, a captive
power cord, and a power switch are also located on the rear
panel. Pin assignments for the DTE and network connections
are listed in the chapter Installation. The DSU III DBU rear panel
is shown in Figure 3-3.
26 DSU III DBU User Manual 61200.037L1-1
Chapter 3. Operation
12
AUXILIARY EIA-232
LINE 1
PRIMARY EIA-232
LINE 2
4
3
5
Identification of Numbers
Item Function
1. Auxiliary EIA-232 Secondary channel services
2. Power Switch Used to turn power on or off
3. Line 1 Connection to the dedicated circuit
4. Line 2 Connection to dial backup
5. Primary EIA-232 DTE interface
6. Primary V.35 High speed DTE interface
7. 115 VAC Connection Power cord connection
PRIMARY V.35
ON
OFF
115 VAC
60HZ .15A
6
7
Figure 3-3
DSU III DBU Rear View
61200.037L1-1 DSU III DBU User Manual 27
Chapter 3. Operation
28 DSU III DBU User Manual 61200.037L1-1
Configuration Overview
LOCAL AND REMOTE CONFIGURATION
The DSU III DBU can be configured locally using the front panel,
or communications can be established with a remote DSU so the
front panel of the local DSU can be used to configure the remote
DSU. During remote configuration the DSU III DBU prompts for
the remote address before displaying the Configuration menus.
Chapter 4. Configuration Overview
Chapter 4
The Configuration menu consists of a group of five submenus
relating to a specific interface or function of the DSU III DBU that
requires setup:
1=Network Opt. Network Interface Parameters
2=DTE Options DTE Interface Parameters
3=Test Options Unit Test Options
4=Dial Options Unit Dialing Options
5=Manual Command ADTRAN Specific Commands
The DSU III DBU contains four different user profiles (sets of
configuration options) stored in read only memory; see the
appendix Default Configuration Profiles. The unit is shipped from
the factory with profile number 1 (default configuration) loaded
into the current (nonvolatile configuration) memory. If profile 1
matches requirements for the system, then no additional configuration is required to put the unit into service. If profile 1
does not match system requirements it can be modified, or one
61200.037L1-1 DSU III DBU User Manual 29
Chapter 4. Configuration Overview
of the other profiles that more closely matches the system
requirements can be loaded into current memory. When a
different profile is loaded, or the existing profile is modified, it is
stored in the current (nonvolatile configuration) memory. The
DSU III DBU is then configured with that profile every time
power is turned on or until the unit is reset.
For detailed information on configuration see the chapters
Configuring Network Options, Configuring DTE Options, Configuring Test Options, Configuring Dial Backup Options, and Manual
Command.
A complete Configuration menu is shown in Figure 4-1.
30 DSU III DBU User Manual 61200.037L1-1
Chapter 4. Configuration Overview
1=AUTO
2=2.4K
3=4.8K 1=NO SEC. CH.
4=9.6K 2=SEC. CHANNEL
5=19.2K
1=LOOP RATE 7=56K
1=NETWORK OPT.
2=DTE OPTIONS 3=V.25 SYNC 2=ENABLED
3=TEST OPTIONS 3=EIA LLB EN/DIS 1=DISABLED 2=TIME 10 SEC. 2=CS DELAY LONG 2=DISABLED
1=LOCAL 1=IGNORED 9=REDIAL COUNTER ENTER REDIAL
3=CONFIG A=SR OPTIONS 3=OFF LOCD ONLY TIME: - -
2=REMOTE ENTER ADDRESS B=SECONDARY RATE 1=OFF B=WAIT TO REDIAL WAIT TO REDIAL
4=DIAL OPTIONS C=ERROR CONTROL 1=BUFFERED
5=MANUAL COMMAND COMMAND: 00 COMMAND: HH 7=AUTO V.42/MNP 1=DISABLED
2=NETWORK ADDR. ENTER NETWORK 1=DTE RATE Options vary according
3=REMOTE CONFIG. 1=DISABLED 1=RS-232
4=CLOCK SOURCE 1=MASTER 3=DATA FORMAT 1=ASYNCHRONOUS 1=ASYNC 9 BITS NUMBER NNNNNNN
1=TEST TIMEOUT (0=OFF) : 00 SEC 2=EXTERNAL 1=FORCED ON 2=DBU ANSWER 1=ENABLED
2=RDL EN/DIS 1=RDL IGNORED 6=CS OPTIONS 3=FOLLOWS CD 2=CS DELAY LONG 5=NO RX SGNL 1=ENABLED
4=EIA RLB EN/DIS 1=DISABLED 8=CD OPTIONS 1=FORCED ON 8=AUTO RESTORE RESTORE TIMER
5=DBU ANS. TEST 1=DISABLED 9=TR OPTIONS 2=COMMAND SWITCH 1=FORCED ON COUNT: - -
6=38.4K
8=64K
ADDRESS:00 to loop rate STORED NUMBER TO
2=ENABLED 2=CONNECTOR TYPE 2=V.35 ISDN Dial Backup
2=FROM NETWORK 2=SYNCHRONOUS 2=ASYNC 10 BITS STORED NUMBER 10 EDIT LOC
4=DTE CMD OPTION 2=AT COMMANDS SET 1=AUTOMATIC DBU 1=DISABLED
ENTER TIMEOUT 5=TRANSMIT CLOCK 1=NORMAL 3=ORIGIN/ANSWER 1=DBU ORIGINATE
2=RDL ACCEPTED 2=DISABLED
2=ENABLED 3=TIME 30 SEC. 7=WHEN ALL 1s/0s 1=ENABLED
2=ENABLED 2=NORMAL (0=OFF): - - MIN
2=ENABLED 3=NO DBU IF OFF 2=OFF OOS ONLY A=FAIL TIMER AUTO DBU FAIL
VALUE:00 D=FLOW CONTROL 2=XON/XOFF
7=ANTI-STREAM 1=TIMER OFF 4=FOLLOWS RS+CD 1=CS DELAY SHORT 6=NO SEAL CUR. 1=ENABLED
1=DISABLED
4=V.25 BSC/ASYNC 2=NUMBER TO DIAL 1=DBU WITH #1
4=TIME 60 SEC. 2=DISABLED
2=75 TIME: - - SEC
3=150 2-wire & 4-wire Dial Backup
4=300 C=NETWORK TYPE 1=AT&T/MCI/OTHER
5=600 2=US SPRINT
6=1.2K
7=2.4K V.32bis and V.34 Dial Backup
3=ASYNC 11 BITS DIRECTORY NUM NNNNNNN
2=FOLLOWS RS 1=CS DELAY SHORT 4=WHEN OOS 2=DISABLED
4=OFF TEST ONLY
1=PHONE NUMBER EDIT: (1-10) NNNNNNN
STORED NUMBER 9 EDIT SPID
2=DBU OPTIONS 2=DIRECT
E=COMPRESSION 1=DISABLED 4=RTS/CTS
C=SWITCH TYPE 2=NT DMS-100
3=RELIABLE MNP
4=AUTO MNP
5=RELIABLE V.42
6=REL. V.42/MNP
2=ENABLED 5=UNI. XON/XOFF
ISDN Dial Backup
1=AT&T 5ESS
3=NATIONAL ISDN1
2=DBU WITH #2
3=CTS ONLY
Figure 4-3
Complete Configuration Menu
61200.037L1-1 DSU III DBU User Manual 31
Chapter 4. Configuration Overview
32 DSU III DBU User Manual 61200.037L1-1
NETWORK OPTIONS
The Network Options configuration parameters control the loop
operation of the DSU III DBU.
Once a parameter is set, Command Accepted is displayed briefly
before returning to the active menu.
Chapter 5. Configuring Network Options
Chapter 5
Configuring Network Options
Table 5-A shows the AT commands used to set the Network
Options.
61200.037L1-1 DSU III DBU User Manual 33
Chapter 5. Configuring Network Options
p
Front Panel AT Command
Rate Commands
Loo
AUTO no secondary channel %B0
2.4K no secondary channel %B1
4.8K no secondary channel %B2
9.6K no secondary channel %B3
19.2K no secondary channel %B4
38.4K no secondary channel %B5
56K no secondary channel %B6
64K clear channel %B7
2.4K with secondary channel %B9
4.8K with secondary channel %B10
9.6K with secondary channel %B11
19.2K with secondary channel %B12
38.4K with secondary channel %B13
56K with secondary channel %B14
Network Address
XX (decimal) _N=xx
Remote Configuration
Disabled &P 4
Enabled &P 5
Clock Source
Master _X0
From Network _X1
Table 5-A
Network Options AT Commands
34 DSU III DBU User Manual 61200.037L1-1
Loop Rate
The Loop Rate option sets the loop operating speed. The unit
should be set to the rate required by the DDS Service. The DSU
III DBU also supports subrate DTE data over a 56 kbps loop.
The loop rate must be set independently of the DTE rate.
Eight loop rate selections are available (shown in Figure 5-1).
After selecting any loop rate other than Auto or 64 kbps the
option for a secondary channel is available. The secondary
channel rate is determined by the current loop rate.
The DSU III DBU does not support subrates operating over a 64 kbps
loop rate.
1=NETWORK OPT.
1=LOCAL 3=REMOTE CONFIG.
3=CONFIG 2=DTE OPTIONS
2=REMOTE ENTER ADDRESS 3=TEST OPTIONS
4=DIAL OPTIONS
5=MANUAL COMMAND
Chapter 5. Configuring Network Options
1=AUTO
2=2.4K
3=4.8K
4=9.6K 1=NO SEC. CH.
1=LOOP RATE 5=19.2K 2=SEC. CHANNEL
6=38.4K
7=56K
8=64K
2=NETWORK ADDR
4=CLOCK SOURCE
Figure 5-1
Setting Loop Rate Options
The default factory setting is Auto, with no secondary channel.
The various loop rates and format selections are listed in Table 5A with the equivalent AT commands that perform the same
configuration functions.
61200.037L1-1 DSU III DBU User Manual 35
Chapter 5. Configuring Network Options
Network Address
A two-digit decimal address can be assigned to each DSU III
DBU. This addressing capability makes it possible to perform
remote configuration and testing in point-to-point and multidrop networks. Figure 5-2 shows the menu path used to change
the network address. The factory default setting is 0.
1=NETWORK OPT.
1=LOCAL 3=REMOTE CONFIG.
3=CONFIG 2=DTE OPTIONS
2=REMOTE ENTER ADDRESS 3=TEST OPTIONS
4=DIAL OPTIONS
5=MANUAL COMMAND
Remote Configuration
This option sets up the DSU III DBU to accept or reject remote
configuration commands. Figure 5-3 shows the menu path for
enabling/disabling remote configuration. The factory default
setting is Enabled.
1=NETWORK OPT.
1=LOCAL 4=CLOCK SOURCE
3=CONFIG 2=DTE OPTIONS
3=TEST OPTIONS
2=REMOTE ENTER ADDRESS 4=DIAL OPTIONS
5=MANUAL COMMAND
1=LOOP RATE
ENTER NETWORK
2=NETWORK ADDR ADDRESS:0
4=CLOCK SOURCE
Figure 5-2
Setting the Network Address
1=LOOP RATE
2=NETWORK ADDR
1=DISABLED
3=REMOTE CONFIG. 2=ENABLED
Figure 5-3
Remote Configuration
36 DSU III DBU User Manual 61200.037L1-1
Clock Source
Chapter 5. Configuring Network Options
The Clock Source options specify the timing source for the DSU
III DBU’s internal circuitry. The factory default setting is From
Network (see Figure 5-4).
1=LOOP RATE
2=NETWORK ADDR
1=NETWORK OPT. 3=REMOTE CONFIG.
3=CONFIG 2=DTE OPTIONS
1=LOCAL 4=CLOCK SOURCE 2=FROM NETWORK
3=TEST OPTIONS
2=REMOTE ENTER ADDRESS 4=DIAL OPTIONS
5=MANUAL COMMAND
When operating on a DDS network, the timing should be From
Network. On a point-to-point private network, one DSU III DBU
must be set for Master, the others set for From Network.
1=MASTER
Figure 5-4
Setting the Clock Source
61200.037L1-1 DSU III DBU User Manual 37
Chapter 5. Configuring Network Options
38 DSU III DBU User Manual 61200.037L1-1
DTE OPTIONS
DTE Rate
Chapter 6. Configuring DTE Options
Chapter 6
Configuring DTE Options
The DTE Options menu is used to select the configuration
parameters that control the operation of the DTE Interface of the
DSU III DBU.
The DSU III DBU supports six DTE rates over a 56 kbps circuit
with no secondary channel and seven DTE rates over a 64 kbps
circuit. If a DTE rate higher than the current loop rate is selected,
the DTE rate automatically sets to match the slower loop rate;
the DSU III DBU briefly displays DTE RATE SAME AS THE
NETWORK before returning to the status screen. The factory
default setting is SAME AS LOOP.
61200.037L1-1 DSU III DBU User Manual 39
Chapter 6. Configuring DTE Options
y
4 kb
y
56 kbps Loop Rate
Secondar
Channel
1=NETWORK OPT. 2=SCRAMBLER ON
1=DTE RATE
2=DTE OPTIONS 2=4.8K
1=LOCAL 5=TRANSMIT CLOCK 6=56K/57.6K 1=SCRAMBLER OFF
3=CONFIG 7=ANTI-STREAM 3=SUPPRESS LBE
2=REMOTE ENTER ADDRESS 8=CD OPTIONS
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL COMMAND B=SECONDARY RATE
2=CONNECTOR TYPE 3=9.6K
3=DATA FORMAT 4=19.2K
4=DTE CMD OPTION 5=38.4K
6=CS OPTIONS 7=SAME AS LOOP 2=SCRAMBLER ON
1=SCRAMBLER OFF
3=DATA INVERT
6
ps Loop Rate or
56 kbps Loop Rate
No Secondar
1=2.4K
Channel
Figure 6-1
Selecting DTE Rates
The AT commands for setting the DTE rate options are shown in
Table 6-A.
40 DSU III DBU User Manual 61200.037L1-1
Chapter 6. Configuring DTE Options
y
F
Table 6-A
DTE Rate Options AT Commands
Front
Panel
1=2.4K %K3 DTE rate: 2.4K sync and async
2=4.8K %K4 DTE rate: 4.8K sync and async
3=9.6K %K5 DTE rate: 9.6K sync and async
4=19.2K %K6 DTE rate: 19.2K sync and async
5=38.4K %K7 DTE rate: 38.4K sync and async
6=56K/57.6K %K8
7=SAME AS LOOP %K9 DTE rate matches loop rate
1=SCRAMBLER OF
2=SCRAMBLER ON _F1 DTE data scrambler enabled
3=DATA INVERT _F2
3=SUPPRESS LBE _F2
AT
Command
DTE rate: 56K sync or 57.6K
as
_F0 DTE data scrambler disabled
DTE data invert enabled (56 kbps
secondary channel loop rate
only)
Suppresses loopback enable
code (LBE) in transmit data from
the DTE after 30 bytes in a row
detected (64 kbps loop rate only)
Description
nc
If the DSU III DBU is set for a loop rate of 56 kbps secondary
channel or 64 kbps then scrambler on/off options are available.
The factory default setting is Scrambler Off.
For point-to-point operation at 56 kbps with secondary channel, the
network requires that the primary and secondary channel data not be
all zeros simultaneously. For HDLC protocol applications, this
constraint can be eliminated by selecting either the Data Invert option
or the Scrambler On option.
For 64 kbps clear channel operation, there is a possibility the DTE data
sequences might mimic network loop maintenance functions and
erroneously cause other network elements to activate loopbacks. To
prevent this, the Scrambler On option should be selected for both the
local and remote DSU III DBU.
61200.037L1-1 DSU III DBU User Manual 41
Chapter 6. Configuring DTE Options
Connector Type
The Connector Type option is used to specify which of the
primary channel connectors is used to connect to the DTE.
Figure 6-2 shows the menu path used to set the connector type.
The factory default setting is V.35. There are no AT commands
available to set the connector type.
1=NETWORK OPT.
1=DTE RATE
2=DTE OPTIONS 1=RS-232
2=CONNECTOR TYPE 2=V.35
1=LOCAL 3=DATA FORMAT
4=DTE CMD OPTION
3=CONFIG 5=TRANSMIT CLOCK
2=REMOTE ENTER ADDRESS 6=CS OPTIONS
7=ANTI-STREAM
8=CD OPTIONS
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL COMMAND B=SECONDARY RATE
Selecting the Connector Type
Figure 6-2
42 DSU III DBU User Manual 61200.037L1-1
Data Format
y
The Data Format option is used to select either the synchronous
or asynchronous mode of operation for the DTE interface. The
factory default setting is Synchronous (see Figure 6-3). If asynchronous is chosen, the length of the data bytes must be selected.
1=NETWORK OPT.
1=DTE RATE
2=DTE OPTIONS 1=ASYNC 9 BITS
1=LOCAL 3=ASYNC 11 BITS
3=CONFIG 4=DTE CMD OPTION
2=REMOTE ENTER ADDRESS 5=TRANSMIT CLOCK
3=TEST OPTIONS
4=DIAL OPTIONS
5=MANUAL
Table 6-B shows the AT commands that can be used to set the
Data Format to asynchronous or synchronous.
2=CONNECTOR TYPE
3=DATA FORMAT 1=ASYNCHRONOUS 2=ASYNC 10 BITS
6=CS OPTIONS
7=ANTI-STREAM
8=CD OPTIONS
Selecting Asynchronous or Synchronous Data Format
Chapter 6. Configuring DTE Options
2=SYNCHRONOUS
Figure 6-3
Data Format Commands
Front
Panel
1=ASYNCHRONOUS &Q0 1=ASYNCHRONOUS
2=SYNCHRONOUS &Q2 2=SYNCHRONOUS
For as
nchronous options, select the length of the data bytes.
1=ASYNC 9 BITS N/A 1=ASYNC 9 BITS
2=ASYNC 10 BITS N/A 2=ASYNC 10 BITS
3=ASYNC 11 BITS N/A 3=ASYNC 11 BITS
61200.037L1-1 DSU III DBU User Manual 43
AT
Command
Front
Panel
Table 6-B
Chapter 6. Configuring DTE Options
DTE Command Option
The DTE Command option is used to enable AT commands from
the DTE, enable V.25 bis (SDLC) commands, enable V.25 (Bisync
and Async), or disable all DTE command modes (see Figure 6-4).
1=NETWORK OPT.
1=DTE RATE
2=CONNECTOR TYPE
3=DATA FORMAT
2=DTE OPTIONS 4=DTE CMD OPTION 2=AT COMMAND SET
1=LOCAL 4=V.25 BSC/ASYNC
3=CONFIG 5=TRANSMIT CLOCK
2=REMOTE ENTER ADDRESS 6=CS OPTIONS
7=ANTI-STREAM
8=CD OPTIONS
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL B=SECONDARY RATE
Selecting DTE Command Option
1=DISABLED
3=V.25 SYNC
Figure 6-4
44 DSU III DBU User Manual 61200.037L1-1
Chapter 6. Configuring DTE Options
Transmit Clock
The Transmit Clock option is used to select the source of the
clock used to transfer data from the DTE into the DSU III DBU.
Figure 6-5 shows the menu path used to set the Transmit Clock
option.
1=NETWORK OPT.
1=DTE RATE
2=CONNECTOR TYPE
3=DATA FORMAT
4=DTE CMD OPTION
2=DTE OPTIONS 1=NORMAL
5=TRANSMIT CLOCK 2=EXTERNAL
1=LOCAL
6=CS OPTIONS
3=CONFIG 7=ANTI-STREAM
2=REMOTE ENTER ADDRESS 8=CD OPTIONS
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL B=SECONDARY RATE
Transmit Clock Options
Figure 6-5
Table 6-C shows the AT commands used to set the Transmit
Clock options.
Table 6-C
Transmit Clock AT Commands
Front
Panel
1=NORMAL &X0 TX clock from DSU selected
2=EXTERNAL &X1 ETC clock from DTE selected
AT
Command
Description
The External clock option is normally used in modem tail circuit
applications. A DSU to modem interconnect diagram for this
application is shown in the appendix DSU to Modem Interconnect.
The External clock option is also recommended when the
61200.037L1-1 DSU III DBU User Manual 45
Chapter 6. Configuring DTE Options
EIA-232 connector is used for 56 kbps and 64 kbps applications.
A special DSU cable diagram for this application is shown in the
appendix EIA-232 Connector. Using this option and special cable
eliminates data errors caused by excessive delays in the DTE
transmit clock receiver and transmit data driver.
Clear to Send (CS) Options
The CS Options menu is used to select the control mode for the
CS lead. Figure 6-6 shows the menu path used to access the CS
options menu. The default factory setting is Follows RS with CS
Delay Short.
1=NETWORK OPT.
2=DTE OPTIONS 1=DTE RATE
1=LOCAL 3=DATA FORMAT
3=CONFIG 5=TRANSMIT CLOCK 1=FORCED ON 1=CS DELAY SHORT
2=REMOTE ENTER ADDRESS 2=FOLLOWS RS 2=CS DELAY LONG
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL B=SECONDARY RATE
2=CONNECTOR TYPE
4=DTE CMD OPTION
6=CS OPTIONS 3=FOLLOWS CD
7=ANTI-STREAM 4=FOLOWS RS+CD 1=CS DELAY SHORT
8=CD OPTIONS 2=CS DELAY LONG
Figure 6-6
Selecting CS Options
If one of the options chosen involves request to send (RS), then
the delay from RS to CS must be selected. Table 6-D shows the
AT Commands used to set the CS options.
46 DSU III DBU User Manual 61200.037L1-1
Chapter 6. Configuring DTE Options
Table 6-D
CS Options AT Commands
Front
Panel
1=FORCED ON &R0 CS always on
2=FOLLOWS RS &R1 CS state same as RS state
3=FOLLOWS CD &R2 CS state same as CD state
4=FOLLOWS RS+CD &R3 CS state same as RS and CD state
For Follows RS options, select the length of the delay.
1=CS DELAY SHORT _D0 Short delay from RS to CS selected
2=CS DELAY LONG _D1 Long delay from RS to CS selected
AT
Cmd.
Description
Specified times for the short and long delays at the different
operating speeds are shown in Table 6-E.
Table 6-E
Short and Long Delays at Different Operating Speeds
Rate Short Delay Long Delay
64 1.1ms 16.1ms
56 1.1ms 16.1ms
19.2 1.5ms 16.5ms
4.8 1.5ms 16.5ms
2.4 1.5ms 16.5ms
61200.037L1-1 DSU III DBU User Manual 47
Chapter 6. Configuring DTE Options
Anti-Stream
The Anti-Stream option is used to select the anti-stream timeout.
Figure 6-7 shows the menu path used to access the Anti-Stream
options menu. The anti-stream timeout is the maximum time the
DSU III DBU transmits data into the network from the DTE.
This feature prevents one DTE device on a multi-drop network
from continuously tying up the transmit circuit back to the
master DSU.
The anti-stream timer is reset to zero when RS changes to the
active state and is updated every second while RS is active.
When the anti-stream timeout expires, the DSU III DBU stops
transmitting DTE data into the network but continues to accept
data from it. This condition exists until the DTE deactivates the
RS input.
1=NETWORK OPT.
1=DTE RATE
2=CONNECTOR TYPE
2=DTE OPTIONS 3=DATA FORMAT
4=DTE CMD OPTION
1=LOCAL 5=TRANSMIT CLOCK 1=TIMER OFF
6=CS OPTIONS 2=TIME 10 SEC.
3=CONFIG 7=ANTI-STREAM 3=TIME 30 SEC.
2=REMOTE ENTER ADDRESS 8=CD OPTIONS 4=TIME 60 SEC.
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL B=SECONDARY RATE
Figure 6-7
Anti-Stream Options
The factory default setting is Timer Off. Table 6-F shows the
available options and their AT commands.
48 DSU III DBU User Manual 61200.037L1-1
Chapter 6. Configuring DTE Options
Table 6-F
Anti-Stream AT Commands
Front
Panel
AT
Command
Description
1=Timer Off %T0 Anti-stream timer disabled
2=Time 10 Sec. %T1 Timeout equals 10 seconds
3=Time 30 Sec. %T2 Timeout equals 30 seconds
4=Time 60 Sec. %T3 Timeout equals 60 seconds
CD Options
The CD Options menu is used to select the control mode for the
receive line signal detector (CD) lead. The default factory setting
is Normal; see Figure 6-8.
1=NETWORK OPT.
1=DTE RATE
2=DTE OPTIONS 3=DATA FORMAT
1=LOCAL 5=TRANSMIT CLOCK
3=CONFIG 7=ANTI-STREAM 1=FORCED ON
2=REMOTE ENTER ADDRESS 8=CD OPTIONS 2=NORMAL
3=TEST OPTIONS 9=TR OPTIONS
4=DIAL OPTIONS A=SR OPTIONS
5=MANUAL B=SECONDARY RATE
2=CONNECTOR TYPE
4=DTE CMD OPTION
6=CS OPTIONS
Figure 6-8
Selecting CD Options
Table 6-G shows the equivalent AT commands for setting CD
options.
61200.037L1-1 DSU III DBU User Manual 49
Chapter 6. Configuring DTE Options
CD Options AT Commands
Front
Panel
1=FORCED ON &C0 On all the time
2=NORMAL &C1 On only when data present on loop
AT
Command
Descriptions
Data Terminal Ready (TR) Options
The TR Options menu is used to select the DSU III DBU response
to the data terminal ready (TR) lead. The factory default setting
is Ignored; see Figure 6-9.
1=NETWORK OPT.
1=DTE RATE
2=CONNECTOR TYPE
2=DTE OPTIONS 4=DTE CMD OPTION
1=LOCAL 6=CS OPTIONS
3=CONFIG 8=CD OPTIONS 1=IGNORED
2=REMOTE ENTER ADDRESS 9=TR OPTIONS 2=COMMAND SWITCH
3=TEST OPTIONS
4=DIAL OPTIONS
5=MANUAL
3=DATA FORMAT
5=TRANSMIT CLOCK
7=ANTI-STREAM
A=SR OPTIONS 3=NO DBU IF OFF
B=SECONDARY RATE
Table 6-G
Figure 6-9
Selecting Data Terminal Ready (TR) Options
Table 6-H shows the equivalent AT commands for setting TR
options.
50 DSU III DBU User Manual 61200.037L1-1
Chapter 6. Configuring DTE Options
Table 6-H
TR Options AT Commands
Front
Panel
AT
Command
Descriptions
1=IGNORE &D0 Ignore the TR input
2=COMMAND SWITCH &D2
Switch to command state if
TR is off
3=NO DBU IF OFF &D3 No dial backup if TR is off
Data Set Ready (SR) Options
The SR Options menu is used to select the operating mode for
the data set ready (SR) lead. Use Shift + A to activate the SR
Options submenu press Enter to enter the SR Options submenu.
The factory default setting is Off Test Only (shown in Figure 6-
10).
1=NETWORK OPT. 2=CONNECTOR TYPE
2=DTE OPTIONS 4=DTE CMD OPTION
1=LOCAL 6=CS OPTIONS
3=CONFIG 3=TEST OPTIONS 8=CD OPTIONS 1=FORCED ON
2=REMOTE ENTER ADDRESS 4=DIAL OPTIONS 9=TR OPTIONS 2=OFF OOS ONLY
5=MANUAL A=SR OPTIONS 3=OFF TEST ONLY
1=DTE RATE
3=DATA FORMAT
5=TRANSMIT CLOCK
7=ANTI-STREAM
B=SECONDARY RATE 4=OFF TEST +OOS
Figure 6-10
Setting Data Set Ready (SR) Options
Table 6-I shows the AT commands for setting SR options.
61200.037L1-1 DSU III DBU User Manual 51
Chapter 6. Configuring DTE Options
Table 6-I
SR Options AT Commands
Front
Panel
AT
Command
Descriptions
1=FORCED ON &S0_C1 Always on
2=OFF OOS ONLY &S1_C1 Off when network out of service
3=OFF TEST ONLY &S0_C0 Off for test only
4=OFF TEST+OOS &S1_C0 Off for test and OOS
Secondary Rate
The Secondary Rate option is used to select the operating speed
for the secondary channel if the secondary channel option was
selected during setup of the Network Options. See Figure 6-11.
Use Shift + B to activate the secondary rate submenu. The
factory default is Off.
1=NETWORK OPT.
1=DTE RATE
2=CONNECTOR TYPE
3=DATA FORMAT
2=DTE OPTIONS 4=DTE CMD OPTION
5=TRANSMIT CLOCK
1=LOCAL 6=CS OPTIONS 1=OFF
7=ANTI-STREAM 2=75
3=CONFIG 8=CD OPTIONS 3=150
2=REMOTE ENTER ADDRESS 9=TR OPTIONS 4=300
A=SR OPTIONS 5=600
B=SECONDARY RATE 6=1.2K
7=2.4K
3=TEST OPTIONS
4=DIAL OPTIONS
5=MANUAL
Figure 6-11
Setting the Secondary Rate
52 DSU III DBU User Manual 61200.037L1-1
Chapter 6. Configuring DTE Options
Table 6-J shows the equivalent AT commands for setting the
secondary rate option.
Table 6-J
Secondary Rate AT Commands
Front
Panel
1=OFF _Y0 No secondary channel selected
2=75 _Y1 Secondary chanel rate: 75 bps
3=150 _Y2 Secondary channel rate: 150 bps
4=300 _Y3 Secondary channel rate: 300 bps
5=600 _Y4 Secondary channel rate: 600 bps
6=1.2K _Y5 Secondary channel rate: 1200 bps
7=2.4K _Y6 Secondary channel rate: 2400 bps
AT
Command
Descriptions
61200.037L1-1 DSU III DBU User Manual 53
Chapter 6. Configuring DTE Options
54 DSU III DBU User Manual 61200.037L1-1
TEST OPTIONS
g
Chapter 7. Configuring Test Options
Chapter 7
Configuring Test Options
The Test Options menu enables or disables different test modes
and specifies the maximum test time allowed. Table 7-A shows
the AT commands for setting the Test options.
Table 7-A
Test Options AT Commands
Front
Panel
Enter Timeout S18=x Specify 0 - 255 second test timeout
RDL Ignored &T5
RDL Accepted &T4 RDL request accepted
EIA LLB Disabled _A0 Responds to local loopback
EIA LLB Enabled _A1 No response to local loopback
EIA RLB Disabled _R0 No response to remote loopback
EIA RLB Enabled _R1 Responds to remote loopback
61200.037L1-1 DSU III DBU User Manual 55
AT
Command
Description
RDL request from remote DSU
i
nored
Chapter 7. Configuring Test Options
Test Timeout
The Test Timeout option sets the length of time a DSU III DBU
remains in a test mode before automatically returning to the data
mode. Enter the timeout in two-digit decimal value. The factory
default setting is off (0). Figure 7-1 shows the menu path used to
access Test Timeout.
1=NETWORK OPT.
2=DTE OPTIONS
1=LOCAL 1=TEST TIMEOUT ENTER TIMEOUT
3=TEST OPTIONS 2=RDL EN/DIS (0=OFF) : 00 SEC
3=CONFIG 3=EIA LLB EN/DIS
2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS
5=DBU ANS. TEST
4=DIAL OPTIONS
5=MANUAL
Setting Test Timeout Option
Remote Digital Loopback (RDL)
Figure 7-1
The RDL option specifies whether or not the DSU III DBU
responds to an RDL request from the far end of the circuit. The
factory default setting is RDL Accepted. Figure 7-2 shows the
menu path for the RDL option.
1=NETWORK TYPE
2=DTE OPTIONS
1=TEST TIMEOUT 1=RDL IGNORED
3=TEST OPTIONS 2=RDL EN/DIS 2=RDL ACCEPTED
1=LOCAL 3=EIA LLB EN/DIS
4=EIA RLB EN/DIS
3=CONFIG 5=DSU ANS. TEST
2=REMOTE ENTER ADDRESS 4=DIAL OPTIONS
5=MANUAL
Figure 7-2
Remote Digital Loopback
56 DSU III DBU User Manual 61200.037L1-1
Chapter 7. Configuring Test Options
EIA LLB
The EIA LLB (Electronics Industries Association local loopback)
option specifies whether or not the DSU III DBU responds to the
local loopback input from the DTE. The factory default setting
is Disabled. Figure 7-3 shows the menu path used to access the
EIA LLB option.
1=NETWORK TYPE
2=DTE OPTIONS
1=LOCAL 1=TEST TIMEOUT
3=TEST OPTIONS 2=RDL EN/DIS
3=CONFIG 3=EIA LLB EN/DIS 1=DISABLED
2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS 2=ENABLED
5=DBU ANS. TEST
4=DIAL OPTIONS
5=MANUAL
Figure 7-3
EIA Local Loopback Options
EIA RLB
The EIA RLB (remote loopback) option specifies whether or not
the DSU III DBU responds to the RLB input from the DTE. The
factory default setting is Disabled. Figure 7-4 shows the menu
path for the EIA RLB options.
1=NETWORK TYPE
2=DTE OPTIONS
1=LOCAL 1=TEST TIMEOUT
3=TEST OPTIONS 2=RDL EN/DIS
3=CONFIG 3=EIA LLB EN/DIS
2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS 1=DISABLED
5=DBU ANS. TEST 2=ENABLED
4=DIAL OPTIONS
5=MANUAL
Figure 7-4
EIA Remote Loopback Options
61200.037L1-1 DSU III DBU User Manual 57
Chapter 7. Configuring Test Options
DBU Answer Test
The dial backup connection can be tested while data is passing
on the DDS. In order for this test to be performed, DBU Answer
Test must be enabled on the remote unit. If DBU Answer Test is
not enabled, the remote unit will not accept a DBU test from the
other end.
1=NETWORK TYPE
2=DTE OPTIONS
1=LOCAL 1=TEST TIMEOUT
3=TEST OPTIONS 2=RDL EN/DIS
3=CONFIG 3=EIA LLB EN/DIS
2=REMOTE ENTER ADDRESS 4=EIA RLB EN/DIS 1=DISABLED
5=DBU ANS. TEST 2=ENABLED
4=DIAL OPTIONS
5=MANUAL
DBU Answer Test Option
Figure 7-5
58 DSU III DBU User Manual 61200.037L1-1
DIAL OPTIONS
Chapter 8. Configuring Dial Options
Chapter 8
Configuring Dial Options
The Dial Options menu stores up to ten phone numbers, defines
the dial backup operation when the DDS circuit fails, and
programs the passcode security feature of the DSU III DBU.
Figure 8-1 shows the full Dial Backup Options (4=Dial Options)
menu. Shaded items are restricted to the specified DBU version.
61200.037L1-1 DSU III DBU User Manual 59
Chapter 8. Configuring Dial Options
A
/ANSW
A
A
A
(
A=FA
A
M
W
4=A
1=PHONE NUMBER EDIT: (1-10) NNNNNNN
3=CONFIG 4=DIAL OPTIONS 2=DBU WITH #2
2=DBU OPTIONS 5=NO RX SGNL 1=DISABLED
STORED NUMBER TO
ISDN Dial Backup
STORED NUMBER 9 NUMBER NNNNNNN
STORED NUMBER 10 DIRECTORY NUM NNNNNNN
1=AUTOMATIC DBU 1=DISABLED
2=NUMBER TO DIAL 1=DBU WITH #1
3=ORIGIN
4=WHEN OOS 1=DISABLED
6=NO SE
7=WHEN ALL 1s/0s 1=DISABLED
8=AUTO RESTORE RESTORE TIMER
9=REDIAL COUNTER ENTER REDIAL
B=WAIT TO REDIAL WAIT TO REDIAL
C=NET
C=ERROR CONTROL 2=DIRECT
D=FLOW CONTROL 4=RTS/CTS
E=COMPRESSION 2=ENABLED
C=SWITCH TYPE 2=NT DMS-100
L CUR. 1=DISABLED
IL TIMER
2-Wire & 4-Wire Dial Backup
ORK TYPE 1=AT&T/MCI/OTHER
V.32 bis and V.34 Dial Backup
2=EN
BLED
ER 1=DBU ORIGINATE
2=DBU ANSWER
2=ENABLED
2=EN
BLED
COUNT: 5
TI
E: 10 SEC
2=US SPRINT
1=BUFFERED
3=RELIABLE MNP
UTO MNP
5=RELIABLE V.42 1=DISABLED
6=REL. V.42/MNP 2=XON/XOFF
7=AUTO V.42/MNP 3=CTS ONLY
1=DISABLED
ISDN Dial Backup
1=AT&T 5ESS
3=NATIONAL ISDN1
EDIT SPID
EDIT LOC
2=EN
BLED
2=ENABLED
0=OFF): 1 MIN
UTO DBU FAIL
TIME: 3X10 SEC
5=UNI. XON/XOFF
3=DBU PASSCODE
1=ENABLE/DISABLE
2=ENTER CODE
Figure 8-1
Dial Backup Options
60 DSU III DBU User Manual 61200.037L1-1
Chapter 8. Configuring Dial Options
Phone Number
The DSU III DBU stores up to ten numbers of 36 digits each. Edit
a phone number by reentering the entire number. This process
overwrites the previously stored number. Figure 8-2 shows the
menu path used to access the Phone Number option.
1=NETWORK TYPE
1=LOCAL 3=TEST OPTIONS
3=CONFIG 1=PHONE NUMBER EDIT: (1-10) NNNNNNN
2=REMOTE ENTER ADDRESS 4=DIAL OPTIONS
2=DTE OPTIONS
STORED NUMBER TO
5=MANUAL 3=DBU PASSCODE STORED NUMBER 9 NUMBER NNNNNNN
2=DBU OPTIONS EDIT SPID
ISDN Dial Backup
Table 8-A shows the AT Commands available for the Phone
Number options.
If a clear channel 64 kbps circuit is required to back up the DDS
circuit, placing a #4 at the end of the SMART dial string (phone
number entered into stored number 1-8) establishes the backup
connection at 64 kbps instead of 56 kbps. For example:
2059718000#4.
Setting the Service Profile Identifier (SPID)
For ISDN dial backup, the service profile identifier (SPID) is
stored in Stored Number 9. The SPID is a sequence of digits
identifying ISDN terminal equipment to the ISDN switch when
more than one ISDN set has been attached to the same central
office line. The SPID is assigned by the telco when the ISDN line
is installed and normally resembles the phone number.
STORED NUMBER 10 DIRECTORY NUM NNNNNNN
EDIT LOC
Figure 8-2
Editing Stored Phone Numbers
Only the AT&T 5ESS switch is capable of recognizing a point-topoint configuration, eliminating the need for a SPID. All other
switch types require a SPID.
61200.037L1-1 DSU III DBU User Manual 61
Chapter 8. Configuring Dial Options
Setting the Local Directory (LOC) Number
For ISDN dial backup, the LOC is stored in Stored Number 10.
AT
Command
&Zn= Store Phone Number
&Z9= Enter SPID Number for ISDN dial backup
&Z10= Edit LOC for ISDN dial backup
Table 8-A
AT Commands for Storing Phone Numbers
Description
62 DSU III DBU User Manual 61200.037L1-1
DBU Options for All Models
The DBU Options are used to select the modes of operation for
the Dial Backup features. There are ten standard options available with additional options for specific backup services. Table
8-B lists the DBU options and their AT commands for all models.
Automatic DBU
The Automatic DBU option specifies whether the unit automatically enters dial backup mode or waits for manual setup. The
factory default setting is Disable.
Number to Dial
The Number to Dial option offers a selection of stored numbers
for the unit to automatically dial. If the leased line fails, and the
DSU III DBU is set to originate, it dials the numbers (in chronological order) specified under this option to set up the dial
backup line. The factory default setting is Dial Stored #1.
Originate/Answer
This option specifies whether the DSU III DBU originates or
waits to answer if the dedicated circuit fails. One end must be
set to Originate and the other to Answer. The factory default
setting is Answer.
Chapter 8. Configuring Dial Options
When Out of Service (OOS)
When enabled, the DSU III DBU enters backup mode if an outof-service condition is detected. The factory default setting is
Enable.
No Receive (RX) Signal
When enabled, the DSU III DBU enters backup mode when a
loss of signal is detected. The factory default setting is Enable.
No Sealing Current
When enabled, the DSU III DBU enters backup mode when a
loss of sealing current is detected. The factory default setting is
Enable.
61200.037L1-1 DSU III DBU User Manual 63
Chapter 8. Configuring Dial Options
When all 1s/0s
When this option is enabled, the DSU III DBU monitors the
receive data for strings of 1s or 0s that are longer than the Fail
Timer. If this condition is detected, the local DSU III DBU
initiates a handshake routine with the remote unit to determine
if the DTE is generating the constant data pattern or if the
network has failed.
Auto Restore
Once the DDS circuit is restored, the DSU III DBU remains in
backup until the DDS circuit is active for the length of time
specified for the restore timer. The selection is entered in minutes (up to 255). If set to 0, the DDS must be restored manually.
The factory default setting is 1 minute.
Redial Counter
This option sets the number of times the DSU III DBU redials the
far end when entering backup mode. The redial count, which is
manually entered, can be up to a maximum of 99 attempts. If the
DSU III DBU encounters a busy or reorder, it attempts to establish the call the specified number of times. The factory default
setting is 5.
RESTORE TIMER
(0=OFF) __ __ MIN
ENTER REDIAL
COUNT: __ __
Fail Timer
This option sets the amount of time the dedicated circuit failure
condition must be active before the DSU III DBU attempts
backup. The amount of time, which is manually entered, can be
up to a maximum of 99 seconds. The factory default setting is 3
seconds.
AUTO DBU FAIL
TIME: __ __ SEC
64 DSU III DBU User Manual 61200.037L1-1
Chapter 8. Configuring Dial Options
p
Wait to Redial
This option works in conjunction with the preceding Redial
Counter. It selects the amount of time between redial attempts to
connect the backup line. The amount of time, which is manually
entered, can be up to a maximum of 99 seconds. The factory
default setting is 10 seconds.
WAIT TO REDIAL
TIME: __ __ SEC
Table 8-B
DBU Options AT Commands for All Models
DBU Options
Automatic DBU
1=Disabled _K0 Automatic DBU disabled
2=Enabled _K1 Automatic DBU enabled
Number to Dial
1=DBU with #1 _B0 Dial stored #1
2=DBU with #2 _B1 Dial stored #2
Originate/Answer
1=DBU Originate _E0 Originates call if DDS fails
2=DBU Answer _E1 Answers call if DDS fails
When Out of Service (OOS)
1=Enabled _G1 DBU when OOS
2=Disabled _G0 No DBU for OOS
No Receive (RX) Signal
1=Enabled _H1 DBU when RX signal absent
2=Disabled _H0 No DBU when RX signal absent
No Sealing Current
1=Enabled _I1 DBU when sealing current absent
2=Disabled _I0 No DBU when sealing current absent
When all 1s/0s
1=Disabled
2=Enabled
Auto Restore S31=x Sets restore timer
Redial Counter S57=x Sets redial counter
Fail Timer S58=x Sets fail timer
Wait to Redial S59=x Sets time between redial attempts
AT
CMD Descri
_P0
_P1
No DBU when all 1s/0s detetected
DBU when all 1s/0s condition exists
tion
61200.037L1-1 DSU III DBU User Manual 65
Chapter 8. Configuring Dial Options
DBU Options for 2-wire and 4-wire
Network Type
This option selects the company providing the switched digital
service. When US Sprint is selected, an automatic echo canceler
suppressor tone is emitted by the DSU III DBU when dialing.
Options include: AT&T/MCI/Other and US Sprint.
DBU Options for V.32 bis and V.34
Table 8-C shows the equivalent AT commands for setting Error
Control, Flow Control , and Compression options.
Error Control
This option determines the type of error control to be negotiated
at the start of a V.32 bis or V.34 modem connection. The factory
default setting is AUTO V.42/MNP.
Flow Control
This option is used to select the type of flow control used by the
V.32 bis or V.34 modem. The factory default setting is CTS Only.
Compression
This option is used to select V.42 bis data compression for V.32
bis or V.34 operation when running asynchronously. When
enabled, data throughput speeds as high as 57.6 kbps may be
achieved. For synchronous applications, the speed is limited to a
maximum of 14.4 kbps for the V.32 and 28.8 kbps for the V.34.
The factory default setting is Enabled.
66 DSU III DBU User Manual 61200.037L1-1
Chapter 8. Configuring Dial Options
DBU Options AT Commands for V.32 bis and V.34 Backup
DBU Options
Error Control
1=Buffered \N0
2=Direct \N1
3=Reliable MNP \N2 Reliable MNP operation. Uses MNP error control.
4=Auto MNP \N3
5=Reliable V.42 \N4
6=Rel. V.42/MNP \N5
7=Auto
V.42/MNP
Flow Control
1=Disabled \Q0 Flow control disabled
2=XON/XOFF \Q1 Enables XOn/XOff flow control
3=CTS Only \Q2 Enables CTS flow control from DCE
AT
CMD
\N6
Description
Normal operation. No error control. Allows speed matching,
buffering, and flow control.
Direct operation. No error control, no buffer, and no flow
control.
Auto-Reliable MNP operation. Tries MNP error control first;
uses normal operation if necessary.
Reliable V.42 (LAPM) operation. Uses V.42 (LAPM) error
control. If V.42 (LAPM) error control cannot be used the call
is disconnected.
Reliable V.42 (LAPM) or MNP operation. Uses either V.42
(LAPM) or MNP error control. If neither can be used the call
is disconnected.
Auto-Reliable V.42 (LAPM) or MNP operation. Tries to use
V.42 (LAPM) error control first, and MNP error control next.
If neither can be used, then Normal operation is used.
Table 8-C
4=RTS/CTS \Q3 Enables CTS flow control from DCE and RTS from DTE
5=UN. XON/XOFF \Q4 Unidirectional XOn/XOff
Compression
1=Disabled %C0 Compression disabled
2=Enabled %C1 Compression enabled
61200.037L1-1 DSU III DBU User Manual 67
Chapter 8. Configuring Dial Options
DBU Options for ISDN
Switch Type
This option selects the type of telco CO switch providing the
ISDN service. There are three options for ISDN switch types:
• AT&T 5ESS
• NT DMS-100
• National ISDN1
DBU Passcode
The dial backup passcode adds an additional level of security to
the DSU III DBU. A passcode of one to ten characters can be
programmed into the unit.
When a dial backup connection is established, the originate unit
transmits a pre-programmed passcode to the answer unit over
the dial backup connection before the connection is considered
valid. The answer unit compares the received passcode to a preprogrammed passcode. If the passcode matches, the receive unit
sends a Passcode OK message to the originate unit and goes online. If the passcode does not match, the receive unit sends an
Invalid Passcode message to the originate unit and terminates
the dial backup connection. If a passcode is not received by an
answer unit with passcode enable, or if the Passcode OK
message is not received by an originate unit with passcode
enable, the dial backup connection is terminated.
68 DSU III DBU User Manual 61200.037L1-1
DIAL OPTIONS
Chapter 9. Dial Options
Chapter 9
Dial Options
The dial options available in the dial menu (4=Dial) vary
whether the DSU III DBU is currently in dial backup mode or
connected to the DDS line (see Figure 9-1).
Answer Unit Connected to DDS Line
1=DIAL BACKUP COMMAND ACCEPTED
Originate Unit Connected to DDS Line
1=DIAL BACKUP 1=DIAL STORED Select Stored Number 1-A
2=ENTER DIAL # NNNNNNN
2=STAY ON LEASED
3=DBU ONLINE TEST
4=DIAL
During Dial Backup
1=HANG UP
2=STAY ON LINE
Figure 9-1
Dial Options Menu
61200.037L1-1 DSU III DBU User Manual 69
Chapter 9. Dial Options
Answer Unit Connected to DDS Line
Dial Backup
The message COMMAND ACCEPTED is displayed and the
DSU III DBU waits for an incoming call. When an incoming call
is detected the DSU III DBU answers the call and enters dial
backup.
Originate Unit Connected to DDS Line
Dial Backup
The DSU III DBU prompts to dial a stored number or enter a
number to dial for dial backup.
Stay on Leased
The DSU III DBU remains on the leased line and does not enter
dial backup mode.
DBU Online Test
This option allows the dial backup connection to be tested
manually without interrupting the data on the DDS. A stored or
manually entered number can be used.
DBU Answer Test must be enabled on the far end to perform a DBU
on-line test.
Dial Options During Dial Backup
Hang Up
Terminates the dial backup connection and attempts to reestablish communication on the DDS line.
Stay On Line
This DSU III DBU remains in dial backup mode and returns to
the Main menu.
70 DSU III DBU User Manual 61200.037L1-1
STATUS
Chapter 10. Status
Chapter 10
Status
The status selection displays two lines of the current operational
status of the network and the DTE interfaces.
After 30 seconds of no front panel operation the DSU III DBU
automatically reverts to the Status display; see Figure 10-1.
This screen only
displayed during test.
Network Rate, DTE Rate, and Data Format
This display line (see Figure 10-1) indicates the current loop rate
on the first line. The DTE data rate and format (as selected in
configuration) are shown on the second line.
61200.037L1-1 DSU III DBU User Manual 71
DTE & LOOP
LOOP 64K
DTE 9.6K SYNC
SW56 DBU STATUS
OPEN LOOP
UNIT IN TEST
OPEN LOOP
Test being performed
1
1
1
1
Network Rate
DTE Rate/Data Format
Dial Backup Mode
Dial Backup Status
DSU Operational Status
DDS Network Status
Figure 10-1
Status Display
Chapter 10. Status
Dial Backup Information
Type of Dial Backup Service
This display line (see Figure 10-1) indicates the type of dial
backup service installed in the DSU III DBU. The following
messages are displayed according to the dial backup option
installed in the DSU III DBU:
DU DBU Status 2-wire Switched 56 backup option in-
stalled.
ISDN DBU Status 1 B+D Basic Rate ISDN backup option
installed.
SW56 DBU Status 4-wire Switched 56 backup option
installed.
V.32 DBU Status V.32 backup option installed.
V.34 DBU Status V.34 backup option installed.
DBU Status No backup service option card installed
Not Installed in the DSU III DBU unit.
Current Status of Dial Backup Mode
This display line (see Figure 10-1) indicates the backup service
status. Possible messages include the following:
Answering Call The DSU III DBU detected an incoming
call message and is initiating call setup
procedure.
Call Disconnect Call disconnect message received from
the remote end.
72 DSU III DBU User Manual 61200.037L1-1
Chapter 10. Status
Called Unit Busy The unit called is currently busy and
cannot be connected (ISDN only).
Dialing The unit is dialing the selected number.
Going to DBU The DSU III DBU is entering dial backup
mode.
Idle Messages are not being transmitted but
the service is immediately available for
use.
Incoming Call Incoming call messages being received.
In Dial Backup The DSU III DBU is currently in dial
backup mode.
No RX Signal Sealing current detected but no data
signal received from telco.
No wink from CO Switched 56 provider encountered a
service problem (4-Wire SW56 only).
Not Installed No dial backup option installed in the
DSU III DBU.
OOS/OOF From Net Out-of-service signal or out-of-frame
condition exists. The call cannot be
completed because the called terminal or
the called terminal's access line is out of
service or is faulty (2-wire and 4-wire
SW56 only).
Open Loop The physical connection to the backup
line has been broken (2-wire and 4-wire
SW56 only).
DBU Line in RDL Remote end initiated a test.
61200.037L1-1 DSU III DBU User Manual 73
Chapter 10. Status
Test From Telco The network provider has activated the
DBU Test Pattern The DSU III DBU is currently performing
Waiting for Call The originating DSU III DBU is waiting
DSU Operation and Network Status
Current DSU III DBU Status
This display line (see Figure 10-1) indicates current DSU III DBU
status. Possible messages are:
Data Mode In data mode, the data set ready (SR) and
Unit in Test The DSU III DBU is currently in test
CSU loopback (2-wire and 4-wire SW56
only).
a test with a pattern.
on a call from the remote end.
request to send (RTS) circuits are on, and
the DSU III DBU is ready to send data.
mode, use the Arrows to scroll through
the menus to display the type of test
being performed.
Current DDS Network Status
This display line (see Figure 10-1) displays the status of the main
telco line. For normal operation this should display LOOP IS
NORMAL, other possible messages are described as follows:
Answering Call The DSU III DBU detects an incoming
call.
Check Telco The transmit and receive (Tx/Rx) pairs of
the loop connection are reversed. The
pairs should be swapped for normal
operation.
Going To DBU This message is displayed briefly while
switching from the dedicated service to
dial backup mode.
74 DSU III DBU User Manual 61200.037L1-1
In Dial Backup The DSU is in dial backup mode.
LL Test From Telco An LL test has been initiated from the
Loop is Normal The DSU is connected to the dedicated
OOS/OOF The telco is transmitting an out-of-service
Open Loop The DDS physical connection has been
Waiting for Call The DBU module is waiting for a call.
DTE Control Leads and Status
Four additional DTE interface leads are displayed with their
current status (on or off) displayed below. The leads are identified as follows:
Chapter 10. Status
telco.
line.
code.
broken.
TR - Data terminal ready
SR - Data set ready
LLB - Local loopback
RLB - Remote loopback.
61200.037L1-1 DSU III DBU User Manual 75
Chapter 10. Status
76 DSU III DBU User Manual 61200.037L1-1
TEST OVERVIEW
Chapter 11. Testing and Troubleshooting
Chapter 11
Testing and Troubleshooting
The DSU III DBU performs a variety of diagnostic functions that
isolate portions of the circuit to identify the problem source.
Tests may be initiated and terminated from the front panel or the
DTE interface. In asynchronous mode, AT commands can
control the testing from the DTE interface. For synchronous
operation, V.25 bis commands can provide test control.
The unit also responds to standard DDS network tests initiated
from telco test centers. In addition, it can run several tests such
as local and remote loopbacks to aid in problem isolation.
DTE DTE
TD
RD
LOCAL
DSU/CSU
Tx
Rx
Tx
Rx
TELCO
REMOTE
DSU/CSU
Tx
Rx
Tx
Rx
TD
RD
Figure 11-1
Normal Operation Before Initiating Loopback Test
All diagnostic tests disrupt data flow.
61200.037L1-1 DSU III DBU User Manual 77
Chapter 11. Testing and Troubleshooting
Initiating a Test
Initiate tests using the following procedure:
1. Select Test from the Main menu by pressing 2, then press
Enter.
2. Specify local, remote, or DBU testing by selecting the corresponding number , followed by Enter.
3. Use the Up and Down arrows to view test options.
4. Select a test from the available options by pressing the
corresponding number , followed by Enter.
The example in Figure 11-2 shows the menu path for initiating a
local DTE and Loop test.
1=LOCAL UNIT 5=TEST PATTERN
1=DTE & LOOP(LL)
2=LOOP ONLY (RT)
3=DTE ONLY
4=DTE WITH TP
6=SELF TEST
2=TEST 2=REMOTE UNIT ENTER TEST UNIT
ADDRESS:0
3=DBU CONNECTION DIAL STORED #
ENTER DIAL #
Figure 11-2
Initiating a Test
Once a test is initiated, Please Wait is displayed briefly followed
by the status screen.
78 DSU III DBU User Manual 61200.037L1-1
Test Status Display
TEST PATTERN
TST ERR = 00
LOOP 56K
DTE 56K SYNC
TR SR LLB RLB
OFF OFF OFF OFF
UNIT IN TEST
LOOP IS NORMAL
While this menu is on the display:
Press 1 to clear errors.
Press 2 to inject an error.
Use the Up and Down arrows
to display other status screens.
The Test Status display appears automatically during a test. The
Test Status display is similar to the status screen described in the
chapter Status, with additional prompts for the type of test and
the number of errors (for tests with a test pattern).
Figure 11-3 shows an example of a Test Status Display for a test
with a test pattern.
Chapter 11. Testing and Troubleshooting
Exiting a Test
61200.037L1-1 DSU III DBU User Manual 79
During a test, press Quick to access the Exit Test/Display Status
menu or press Cancel to return to the Main menu. The Exit
Test/Display Status menu provides the following options, which
are available only after a test has been initiated (see Figure 11-4):
Exit Test Exits the current test and returns to the
Display Status Reenters test display.
Figure 11-3
Sample Test Status Displays
Main menu.
Chapter 11. Testing and Troubleshooting
1=DTE & LOOP(LL)
2=LOOP ONLY (RT)
3=DTE ONLY
4=DTE WITH TP 4=STRESS PTRN #2
5=TEST PATTERN 4=STRESS PTRN #2
1=LOCAL UNIT 6=STRESS PTRN #4
6=SELF TEST
2=TEST 2=REMOTE UNIT ENTER TEST UNIT 3=STRESS PTRN #1 1=EXIT TEST
ADDRESS:0 4=STRESS PTRN #2
STATUS DISPLAY
STATUS DISPLAY
STATUS DISPLAY
1=2047 PATTERN
2=511 PATTERN 1=EXIT TEST
3=STRESS PTRN #1
5=STRESS PTRN #3
6=STRESS PTRN #4
1=2047 PATTERN
2=511 PATTERN
3=STRESS PTRN #1 1=EXIT TEST
5=STRESS PTRN #3
STATUS DISPLAY
1=2047 PATTERN
2=511 PATTERN
5=STRESS PTRN #3
6=STRESS PTRN #4
7=DATA FROM DTE
1=EXIT TEST
2=DISPLAY STATUS
1=EXIT TEST
2=DISPLAY STATUS
1=EXIT TEST
2=DISPLAY STATUS
STATUS DISPLAY
STATUS DISPLAY
STATUS DISPLAY
2=DISPLAY STATUS
2=DISPLAY STATUS
2=DISPLAY STATUS
3=DBU CONNECTION DIAL STORED # 1=EMPTY
ENTER DIAL # 3=EMPTY
2=EMPTY
4=EMPTY
5=EMPTY
6=EMPTY
7=EMPTY
8=EMPTY
9=EMPTY
A=EMPTY
Figure 11-4
Complete Test Menu
80 DSU III DBU User Manual 61200.037L1-1
TROUBLESHOOTING
p
p
p
p
This section is intended to provide a quick and easy means of
diagnosing suspected problems associated with local or remotely
attached ADTRAN DSU/CSUs.
Messages from the DSU/CSU
Messages on the LCD display and LEDs display information
concerning the status of the unit and the local loop. If the Alarm
LED is On, one or more of the messages shown in Table 11-A is
displayed on the LCD.
The Status menu must be selected in order for the unit to display status
messages. Pressing Quick returns to the Main menu where STATUS
can be selected.
Message Meaning
Good local loop signal
LOOP IS NORMAL
OPEN LOOP
NO RX SIGNAL
OOS/OOF
FROM NET
CHECK TELCO LINE
TEST FROM TELCO
being received from
the telco.
Unit not receiving a
signal from the telco.
Unit detects sealing
current but no data
signal from telco.
Unit detects an out-ofservice or out-of-frame
condition from the
telco.
Transmit/receive pair
reversal detected.
Telco activated a
loopback to test the
DDS circuit.
Chapter 11. Testing and Troubleshooting
Table 11-A
Messages from the DSU/CSU
Probable Cause Action
Indicates good local
loop.
Bad telco cable from
the DSU to telco jack
or bad circuit to telco.
Bad conductor in telco
cable from DSU to
telco jack or bad
circuit to telco.
Telco is having
problems with DDS
circuit or remote unit
is turned off or
disconnected.
Telco wall jack wired
incorrectly.
Telco is testing circuit. Wait until test is
No action required;
unit properly
connected to telco
circuit.
Replace telco cable
from DSU to wall jack.
If a problem persists,
contact telco
Replace telco cable
from DSU to wall jack.
If a problem persists,
contact telco
Check remote unit.
Contact telco service
provider.
Switch wire pairs in
wall jack or contact
telco service
complete or contact
telco service
rovider.
rovider.
rovider.
rovider.
61200.037L1-1 DSU III DBU User Manual 81
Chapter 11. Testing and Troubleshooting
Troubleshooting New Installs
Before initiating diagnostics on a newly installed unit and/or
DDS circuit and before contacting ADTRAN Technical Support,
please check the items in Table 11-B to ensure the unit is configured properly.
After verifying the items listed in Table 11-B the unit should
operate properly and display the following:
DA TA MODE
LOOP IS NORMAL
If a status message other than DATA MODE LOOP IS NORMAL is shown, begin performing diagnostics described in the
section Test Sequence for Troubleshooting New Installs or Existing
Circuits.
Configuration
Item to Check
DTE Type RS-232 or V.35
Loop Rate Auto, 2.4 to 64 kbps
Data Format Async or Sync
DTE Cable N/A
Telco Cable N/A
Power the unit
Off and then On.
Option Selection
N/A
Table 11-B
Troubleshooting New Installs
Action
Select the type of DTE interface option to
connect to the DSU/CSU from the
configuration menu.
Select the DDS loop rate of the DDS circuit
from the configuration menu.
Select the type of data to be used from the
configuration menu.
Verify DTE cable connection to the proper
DTE connector on the DSU/CSU.
Verify the telco cable is securely connected to
the DSU/CSU and wall jack.
Verify the unit passes self test during powerup (displayed on the LCD).
82 DSU III DBU User Manual 61200.037L1-1
Chapter 11. Testing and Troubleshooting
Test Sequence for Troubleshooting New Installs or Existing Circuits
If your DSU is suspected of having problems, perform a Self
Test to determine if the unit is in good health.
If your DSU is receiving excessive errors requiring retransmission of data, first perform a DTE with Test Pattern to determine
if the unit's internal transmitter and receiver is operating error
free. If problem persists, perform a Remote Test to verify the
connection between the local and remote unit is error fr ee. Run
the test using all available test patterns.
If an external BERT tester is available, these additional tests may be
performed:
• DTE & Loop Test
• DTE Only Test
• Loop Only Test
If the unit fails any of these tests or the problem has not been
determined, contact ADTRAN Technical Support; see inside back
cover.
61200.037L1-1 DSU III DBU User Manual 83
Chapter 11. Testing and Troubleshooting
play
p
LOCAL UNIT DIAGNOSTICS
The local DSU III DBU can perform six different tests; see Table
11-C.
Table 11-C
Test AT Commands
Front
Panel
Dis
DTE & Loop (LL) &T10 TD/RD and RX/TX Loopbacks
Loop Only (RT) &T11 RX/TX Loopback at DTE Interface
DTE Only &T1 TX/RX Loopback at Network Interface
DTE with TP &T8 TX/RX Loopback with Test Pattern
Test Pattern &T9 Transmit/Receive Test Pattern
Self Test Z Check Internal Components (Resets Unit)
Exit Test &T0 Sto
TD = Customer Transmit Data
RD = Customer Receive Data
TX = Network Transmit Data
RX = Network Receive Data
AT
Command
Description
s test, returns to data mode
The test patterns shown in Table 11-D are available for the DTE
with Test Pattern and Test Pattern tests.
84 DSU III DBU User Manual 61200.037L1-1
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