Adtran DSU III DBU User Manual
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
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