Adtran DSU 5600 User Manual

DSU 5600

Data Service Unit

USER MANUAL

61200.078L1-1D
May 1997

901 Explorer Boulevard

P.O. Box 140000

Huntsville, AL 35814-4000

Phone: [phone]

© 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

56 kbps Digital Interface 04DU5-56 6.0F RJ-48S

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.

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.

Table of Contents

Table of Contents

Table of Contents

Chapter 1. Introduction

General Description................................................................................................................ 1

Physical Description ............................................................................................................... 2

Front Panel ....................................................................................................................... 2

LED Identification .................................................................................................... 2

DTE Status (Green) ........................................................................................... 2

Network Status (Red) ....................................................................................... 2

Test Status/Error (Yellow/Red) ...................................................................... 3

Select and Test Buttons ............................................................................................ 3

Rear Panel ......................................................................................................................... 4

Chapter 2. Installation

Unpacking................................................................................................................................ 7

ADTRAN Shipments Include ........................................................................................ 7

Customer Provides .......................................................................................................... 7

Warranty and Customer Service .......................................................................................... 8

Powering .................................................................................................................................. 8

Configuration .......................................................................................................................... 8

DTE Rate and Scrambler - SW 1, SW 2, SW 3 .............................................................. 8

Loop Rate - SW 4 ............................................................................................................. 9

Clear To Send (CS) - SW 5 .............................................................................................. 9

Carrier Detect (CD) - SW 6 ........................................................................................... 10

Data Set Ready (SR) - SW 7 .......................................................................................... 10

Remote Digital Loopback (RDL) - SW 8..................................................................... 10

Network Connections ...........................................................................................................11

DTE Connections .................................................................................................................. 12

Chapter 3. Test Modes

Self Test ................................................................................................................................... 13

Near End Test ........................................................................................................................ 14

DTE Only Test ................................................................................................................ 14

DTE With Test Pattern (TP) ......................................................................................... 16

DTE and Loop Test (LL) ............................................................................................... 18

Loop Only Test .............................................................................................................. 20

Far End Tests ......................................................................................................................... 21

Remote Digital Loopback (RDL) ................................................................................. 21

61200.078L1-1 DSU 5600 User Manual i

Table of Contents

RDL With Test Pattern (TP) ......................................................................................... 21

Test Pattern (PTRN) ...................................................................................................... 22

Remote Tests .......................................................................................................................... 23

Chapter 4. Specifications Summary

Specifications and Features ................................................................................................. 25

Loop Interface .................................................................................................. 25

Line Requirements .......................................................................................... 25

Loop Rates ........................................................................................................ 25

Receiver Sensitivity ......................................................................................... 25

DTE Interfaces ................................................................................................. 25

DTE Data Rates................................................................................................ 25

DTE Operating Modes ................................................................................... 25

Diagnostics ....................................................................................................... 26

Power ................................................................................................................ 26

Environment .................................................................................................... 26

Index ....................................................................................................................................... 27

List of Tables

Table 2-A Switch Settings for DTE Async Rate .............................................................. 9

Table 2-B Network Connections......................................................................................11

Table 2-C Pin Assignments for Primary EIA-232 Connector ..................................... 12

List of Figures

Figure 1-1 DSU 5600 Front Panel ....................................................................................... 4

Figure 1-2 DSU 5600 Rear Panel ........................................................................................ 5

Figure 3-1 DTE Only Test Diagram ................................................................................. 15

Figure 3-2 DTE with Test Pattern Test Diagram ............................................................ 17

Figure 3-3 DTE and Loop Test Diagram ......................................................................... 19

Figure 3-4 Loop Only Test Diagram ................................................................................ 20

ii DSU 5600 User Manual 61200.078L1-1

GENERAL DESCRIPTION

The ADTRAN DSU 5600 is a technologically advanced, high
performance Data Service/Channel Service Unit (DSU/CSU)
that provides the interface between telco provided Digital Data
Service (DDS) and the customer’s Data Terminal Equipment
(DTE).

The DSU 5600 supports both 56 kbps and 64 kbps loop service
rates and provides either synchronous or asynchronous modes
of operation for the DTE interface. When the DTE interface is
configured for synchronous operation, the DSU 5600 matches
the selected loop rate. When the DTE interface is configured for
asynchronous operation, it supports asynchronous data commu­nications over either a 56 kbps or 64 kbps DDS service. In
asynchronous mode, the DTE can be configured to operate at
any of the standard asynchronous communication rates from 1.2
kbps to 57.6 kbps. All setup or configuration is accomplished
with a single eight position DIP switch that is accessible from
the back panel of the unit.

Chapter 1. Introduction

Chapter 1

Introduction

The DSU 5600 has an industry standard EIA-232 interface
provided on a 25 pin connector.

61200.078L1-1 DSU 5600 User Manual 1

Chapter 1. Introduction

PHYSICAL DESCRIPTION

The DSU 5600 is a stand alone unit designed to be used either on
a desktop or mounted on a wall. The physical measurements of
the DSU 5600 are:

Length = 8.32 inches
Width = 6.50 inches
Height = 1.56 inches
Weight = 1.50 pounds

Front Panel

As shown in Figure 1-1, the front panel of the DSU 5600 contains
eleven LED indicators that display DTE interface, network, and
test status. These indicators are defined in the following section
LED Identification.

LED Identification

DTE Status (Green)

INDICATOR DEFINITION SOURCE

RS Request To Send DTE

CS Clear To Send DSU
TD Transmit Data DTE
RD Receive Data DSU
CD Carrier Detect DSU

The active state for the status indicators (RS, CS, and CD) is On; the
On state for the data indicators (TD and RD) represents a SPACE
condition.

Network Status (Red)

ALM On indicates a problem on the local loop or within

the DDS network.
Off indicates a normal loop and network conditions.

2 DSU 5600 User Manual 61200.078L1-1

Chapter 1. Introduction

Test Status/Error (Yellow/Red)

DTE On indicates DTE interface test in progress.

Flashing indicates loop interface test (CSU Loopback)

has been initiated by the telco.

Loop On solid indicates loop interface test has been

initiated from local DSU.
Flashing indicates loop interface test (CSU or DSU
Loopback) has been initiated by the telco.

RDL On solid indicates remote digital loopback test has

been initiated from the local DSU.
Flashing indicates remote digital loopback test has
been initiated from the remote DSU.

PTRN On indicates integral pattern generator is being

utilized for testing.

Error On solid indicates remote digital loopback test has

been initiated from the local DSU.
Flashing indicates remote digital loopback test has
been initiated from the remote DSU.

For more information on the tests indicated by the indicators
described previously see the chapter Test Modes.

Select and Test Buttons

The front panel also contains two push-button switches for
selecting and controlling the various test modes for the DSU

5600.

Select Each time this switch is pressed the current test

mode is displayed by turning On one or more LEDs
to indicate the specific test.

Test Once the desired test mode is displayed on the test

status indicators, the test is initiated by activating
this switch. This switch is also activated to termi­nate any test in progress.

61200.078L1-1 DSU 5600 User Manual 3

Chapter 1. Introduction

CDRDTDCSRS ALM

DSU 5600

TEST

LOOPDTE

ERRORPTRNRDL

Rear Panel

SELECT

1

32 4 5

TEST

1. DTE Status LEDs

2. Network Status Indicator

3. Test Status/Error Indicators

4. Select Push Button Switch

5. Test (Start/Stop) Push Button Switch (Alternate Action)

Figure 1-1

DSU 5600 Front Panel

A drawing of the rear panel of the DSU 5600 is shown in Figure
1-2. The 25-pin connector labeled PRIMARY EIA-232 provides
the synchronous/asynchronous DTE interface. Connection to the
DDS network is made using the 8-pin modular jack (RJ-48S)
labeled TELCO. The pin assignments for these connectors are
listed in the sections Network Connections and DTE Connections.

All setup or configuration parameters for the DSU 5600 are
selected with an eight position DIP switch that is accessible from
the rear panel. This switch is labeled OPTIONS, and reference is
made to the options chart on the bottom of the unit. The indi­vidual options are explained in detail in the section Powering.

A power cord is also shown on the rear panel of the DSU 5600.
The captive power cord on the back panel provides connection
to the AC/DC power supply.

4 DSU 5600 User Manual 61200.078L1-1

TELCO OPTIONS

TELCO OPTIONS

(LISTED ON BOTTOM)

(LISTED ON BOTTOM)

1234567812345678

12345678

1234567812345678

12345678

1234567812345678

12345678

PRIMARY EIA-232

PRIMARY EIA-232

Chapter 1. Introduction

115 VAC

115 VAC

60HZ .06A

60HZ .06A

Figure 1-2

DSU 5600 Rear Panel

61200.078L1-1 DSU 5600 User Manual 5

Chapter 1. Introduction

6 DSU 5600 User Manual 61200.078L1-1

UNPACKING

After unpacking the DSU 5600, carefully inspect it for shipping
damages. If damage is suspected, file a claim immediately with
the carrier and then contact ADTRAN Technical Support. If
possible, keep the original shipping container for use in return­ing the unit to ADTRAN for repair or verification of shipping
damage.

ADTRAN Shipments Include

Chapter 2. Installation

Chapter 2

Installation

The following items are included in ADTRAN shipments of the
DSU 5600:

• The DSU 5600 unit

• Network interface cable (an 8-position modular to 8-position
modular)

• The user manual

Customer Provides

The customer must provide an EIA-232 interface cable with
standard 25-pin male D-type connectors (Cannon or Cinch DB­19604-432).

61200.078L1-1 DSU 5600 User Manual 7

Chapter 2. Installation

WARRANTY AND CUSTOMER SERVICE

For information regarding warranty and customer service see
the inside cover of this manual.

POWERING

The DSU 5600 is equipped with a captive six-foot power cord
that is terminated with a three-prong plug for connecting to a
grounded power receptacle.

Ensure that a grounded, 115 VAC, 60 Hz receptacle is used for power­ing the DSU 5600.

When the DSU 5600 is plugged into an AC power source, it
performs a SELF TEST that tests all LED indicators plus various
circuit blocks within the unit. Proper operation plus failures are
indicated via the LED indicators.

CONFIGURATION

The DSU 5600 has eight options for controlling the operation of
both the network and DTE interfaces. These options are selected
by setting individual switches on the eight position DIP switch
that is accessible from the rear panel. A label of the switch
settings and their respective options is attached to the bottom of
the unit for convenience.

DTE Rate and Scrambler - SW 1, SW 2, SW 3

These three switches select the data rate for the DTE interface
and enable or disable the scrambler. As shown in Table 2-A,
combinations of up and down settings for these switches select
specific data rates and enable or disable the scrambler.

When operating at 64 kbps synchronously in Frame Relay networks the
scrambler must be disabled. When operating synchronously on a 64
kbps DDS loop not supporting Frame Relay the scrambler should be
enabled.

8 DSU 5600 User Manual 61200.078L1-1

Loop Rate - SW 4

When the SW4 switch is in the down (56 kbps) position, the
network interface of the DSU 5600 is configured for operation at
56 kbps, and when this switch is in the up (64 kbps) position, the
network interface is configured for 64 kbps operation.

For 64 kbps clear channel operation, there is a possibility that the
DTE data sequences might mimic network loop maintenance
functions and erroneously cause other network elements to
activate loopbacks. To prevent this, a data scrambler is enabled
when the 64 kbps option is selected.

Chapter 2. Installation

Table 2-A

Switch Settings for DTE Rate

DTE Rate SW 1 SW 2 SW 3

1.2 and 2.4 kbps Async Down Down Down
Sync, Scrambler Disabled Up Down Down

4.8 kbps Async Down Up Down

9.6 kbps Async Up Up Down

19.2 kbps Async Down Down Up

38.4 kbps Async Up Down Up

57.6 kbps Async Down Up Up
Sync, Scrambler Enabled Up Up Up

Clear To Send (CS) - SW 5

When this switch is in the down (normal) position Clear To Send

(CS) follows the Request To Send (RS) lead with 250 µ ± 125 µ of

delay. The only exceptions to this occur when network or test
conditions prevent data from being transferred over the DTE
interface. During these conditions CS is turned Off.

For the up (On) position CS is forced On all the time.

61200.078L1-1 DSU 5600 User Manual 9

Chapter 2. Installation

Carrier Detect (CD) - SW 6

When this switch is in the down (normal) position, Carrier
Detect (CD) is On any time customer data is being received and
Off when the receive circuit is idle, (not carrying customer data).

When this switch is in the up (On) position, CD is forced On all
the time.

Data Set Ready (SR) - SW 7

When this switch is in the down (On) position, Data Set Ready
(SR) is forced On all the time. For the up (normal) position, SR is
turned Off when the network is out of service or a test is in
progress.

Remote Digital Loopback (RDL) - SW 8

When this switch is in the down (enable) position, the DSU 5600
accepts the industry standard V.54 Remote Digital Loopback
(RDL) command from the far end of the circuit.

When this switch is in the up (disable) position, the DSU 5600
does not respond to a V.54 loopback command from the far end
of the circuit.

10 DSU 5600 User Manual 61200.078L1-1

NETWORK CONNECTIONS

This interface consists of four leads paired to provide separate
transmit and receive circuits. The four leads are provided on the
eight position modular jack (RJ-48S) labeled TELCO on the rear
panel of the DSU 5600. The pin assignments for this connector
are shown in Table 2-B.

Pin

Number

1 Transmit Data (R) From Customer to Network Interface
2 Transmit Data (T) From Customer to Network Interface
3-6 Not Used
7 Receive Data (T-1) From Network Interface to Customer
8 Receive Data (R-1) From Network Interface to Customer

Chapter 2. Installation

Table 2-B

Network Connections

Function Signal Direction

61200.078L1-1 DSU 5600 User Manual 11

Chapter 2. Installation

DTE CONNECTIONS

The Data Terminal Equipment is attached to the connector
labeled PRIMARY EIA-232 at the rear of the DSU 5600. The pin
assignments for all pins used on this connector are shown in
Table 2-C.

Table 2-C

Pin Assignments for Primary EIA-232 Connector

Pin

Number

1 A A Protective Ground (PG)
2 BA Send 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 Receive Line Signal Detector (CD)
9 - Not Used
10 - Not Used
11-14 - Not Used
15 D B Transmit Clock (SCT)
16 - Not Used
17 D D Receive Clock (SCR)
19-24 - Not Used

Function Signal Direction

A shielded EIA-232 cable is required to prevent possible radio fre­quency interference emissions.

12 DSU 5600 User Manual 61200.078L1-1

SELF TEST

Chapter 3. Test Modes

Chapter 3

Test Modes

In addition to a self test mode, other DSU 5600 test modes allow
the user to isolate problems to specific components of the
communications circuit. These various test modes for the DSU
5600 are initiated and terminated from the front panel using
Select and Test.

When the DSU 5600 is powered on, all LEDs on the front panel
turn On simultaneously for approximately two seconds then
turn Off briefly. The LEDs then cycle On in pairs with a fan-out
pattern away from the ALM indicator. Next, the LEDs cycle Off
in pairs with a fan-in pattern back towards the ALM indicator.
These patterns are repeated four times to determine that all
LEDs are functioning properly.

At completion of the LED test patterns the PTRN LED is On,
indicating the DTE with TP test is being performed. This test is
successful if the Error indicator does not turn On. If the DTE
with TP test fails, the RS, ALM, DTE, PTRN, and Error indica­tors all Flash.

If an EPROM CHECKSUM failure is detected during self test,
CS, ALM, PTRN, and Error indicators Flash at the end of the self
test.

61200.078L1-1 DSU 5600 User Manual 13

Chapter 3. Test Modes

NEAR END TEST

DTE Only Test

The local DSU 5600 is capable of performing the following near
end tests:

• DTE Only

• DTE with Test Pattern

• DTE and Loop (LL)

• Loop Only (RT)

The DTE Only test provides a method for testing both the DTE
interface of the local DSU 5600 plus its loop transmitter and
receiver. For this test, the loop transmit data is connected to the
loop receive data at a point close to the physical network inter­face. A block diagram illustrating the loopback point and the
signal paths for this test is shown in Figure 3-1.

To initiate the DTE Only test, perform the following steps:

1. Press Select once to turn On the DTE test indicator.

2. Press Test while the test indicator is On.

To terminate this test, press Test.

Test data from the terminal or test equipment is routed through
the DTE section of the DSU 5600 and then to the output of the
loop transmitter section where the signal is encoded for trans­mission. The output of the loop transmitter is coupled back to
the loop receiver input. This receive test signal is then decoded
and returned to the terminal or test equipment where it is
checked for bit errors.

14 DSU 5600 User Manual 61200.078L1-1

Chapter 3. Test Modes

DTE OR
TEST
EQUIPMENT
INTERFACE

TD

RD

DTE

TRANSMIT

INTERFACE

DTE

RECEIVE

INTERFACE

DTE

ONLY

NETWORK

LOOP

TRANSMIT

INTERFACE

LOOP

RECEIVE

INTERFACE

INTERFACE

LOOP TX

LOOP RX

Figure 3-1

DTE Only Test Diagram

61200.078L1-1 DSU 5600 User Manual 15

Chapter 3. Test Modes

DTE with Test Pattern (TP)

The DTE with Test Pattern (TP) test is similar to the DTE Only
test described previously. The DTE with TP test is initiated at
the local DSU 5600 and is used to independently test the opera­tion of the DSU 5600.

To initiate the DTE with TP test, perform the following steps:

1. Press Select twice to turn On both the DTE and PTRN test
indicators.

2. Press Test while these test indicators are On.

To terminate this test, press Test.

Instead of using data from the terminal or test equipment, this
test utilizes an internal test pattern generator and detector built
into the DSU 5600. The loopback point and the data paths for
this test are illustrated in Figure 3-2.

The internal test pattern generator and detector of the DSU 5600
operate with a 2047 data pattern. When this test is initiated, the
test pattern detector examines the receive data stream until
synchronization to the 2047 pattern is achieved. Once synchro­nized, the detector continues to check the receive data and
reports any bit errors detected by turning On the Error LED.

Once a test is initialized with the internal test pattern generator
and detector, errors can be injected into the transmit data stream
by pressing Select and observed by watching the Error LED turn
On for a brief period of time.

As previously mentioned, the DTE with TP test is automatically
performed during the self test sequence for the DSU 5600.

16 DSU 5600 User Manual 61200.078L1-1

DTE OR
TEST
EQUIPMENT
INTERFACE

TD

RD

DTE

TRANSMIT

INTERFACE

DTE

RECEIVE

INTERFACE

TEST PATTERN

GENERATOR

TEST PATTERN

DETECTOR

DTE

WITH

TEST PATTERN

Chapter 3. Test Modes

NETWORK
INTERFACE

LOOP

TRANSMIT

INTERFACE

LOOP

RECEIVE

INTERFACE

LOOP TX

LOOP RX

Figure 3-2

DTE with Test Pattern Test Diagram

61200.078L1-1 DSU 5600 User Manual 17

Chapter 3. Test Modes

DTE and Loop Test (LL)

The DTE and Loop test is initiated at the local DSU 5600 and
allows independent testing of the separate sections of the DSU

5600. First, it allows the local DTE interface to be tested with data
from the terminal or test equipment. Second, it allows the loop
interface section of the local DSU 5600 to be tested from the
remote site over the actual communications circuit. Testing from
the remote end of the circuit is done with test data generated by
the remote DSU or terminal type test equipment.

The DTE and Loop test splits the DSU 5600 into separate DTE
and Loop interface sections and then loops the transmit data of
each interface back to its respective receive data. A block dia­gram illustrating the loopback points and the signal paths for
this test is shown in Figure 3-3.

To initiate the DTE and Loop test, perform the following steps:

1. Press Select three times to turn On both the DTE and Loop
test indicators.

2. Press Test while these test indicators are On. The DTE and
Loop LEDs Flash during initialization of the test and turn On
solid once the test is in progress.

To terminate this test, press Test.

18 DSU 5600 User Manual 61200.078L1-1

Chapter 3. Test Modes

DTE OR
TEST
EQUIPMENT
INTERFACE

NETWORK

DTE

TRANSMIT

TD

RD

INTERFACE

DTE

RECEIVE

INTERFACE

DTE
AND

LOOP

LOOP

TRANSMIT

INTERFACE

LOOP

RECEIVE

INTERFACE

INTERFACE

LOOP TX

LOOP RX

Figure 3-3

DTE and Loop Test Diagram

61200.078L1-1 DSU 5600 User Manual 19

Chapter 3. Test Modes

Loop Only Test

The Loop Only test allows the loop interface and a major portion
of the DTE interface of the local DSU 5600 to be tested from a
remote site over the actual digital data circuit.

During the Loop Only test, the network receive data is looped to
the network transmit data inside the DTE interface section of the
DSU 5600. The physical DTE interface is ignored for this test. A
block diagram illustrating the loopback point and the signal
paths for this test is shown in Figure 3-4.

To initiate the Loop Only test, perform the following steps:

1. Press Select four times to turn On the loop test indicator.

2. Press Test while this test indicator is On. The Loop LED
Flashes during initialization of the test and turns On solid
once the test is in progress.

To terminate this test, press Test.

DTE OR
TEST
EQUIPMENT
INTERFACE

TD

RD

DTE

TRANSMIT

INTERFACE

DTE

RECEIVE

INTERFACE

LOOP
ONLY

LOOP

TRANSMIT

INTERFACE

LOOP

RECEIVE

INTERFACE

NETWORK
INTERFACE

LOOP TX

LOOP RX

Figure 3-4

Loop Only Test Diagram

20 DSU 5600 User Manual 61200.078L1-1

FAR END TESTS
Remote Digital Loopback (RDL)

When the remote digital loopback (RDL) test is initiated at the
local DSU 5600, it commands the remote DSU into loopback with
the industry standard V.54 loopback pattern. The loopback point
and the signal paths for the remote DSU are the same as the
Loop Only test for a local DSU (Figure 3-4). This loopback test is
performed with data from the terminal or test equipment.

To initiate the RDL test, perform the following steps:

1. Press the Select switch five times to turn On the RDL test
indicator.

2. Press Test while the test indicator is On. The RDL LED
Flashes during initialization of the test and turns On solid
once the test is in progress.

To terminate this test, press Test.

RDL with Test Pattern (TP)

Chapter 3. Test Modes

When the RDL with TP test is initiated at the local DSU 5600, it
commands the remote DSU into loopback with the industry
standard V. 54 loopback pattern. The loopback point and the
signal paths for the remote DSU are the same as the Loop Only
test for a local DSU (Figure 3-4). This loopback test is performed
with data from the internal test pattern generator and error
detector.

To initiate the RDL with TP test, perform the following steps:

1. Press Select six times to turn On both the RDL and PTRN
test indicators.

2. Press Test while these test indicators are On. The RDL and
PTRN LEDs Flash during initialization of the test and turn
On solid once the test is in progress.

To terminate this test, press Test.

61200.078L1-1 DSU 5600 User Manual 21

Chapter 3. Test Modes

Test Pattern (PTRN)

When the PTRN test is initiated, the local DSU 5600 uses the
integral test pattern generator to transmit a standard 2047 test
pattern to the DSU On the far end of the circuit. The local DSU
5600 then examines the received data for the standard 2047
pattern. Once this pattern is detected the, Error indicator is
turned Off. The Error indicator turns On when errors in the
receive data pattern are detected. While this test is active, errors
can be injected into the transmit data stream by pressing the
Select push button.

To initiate the PTRN test, use the following steps:

1. Press the Select switch seven times to turn On the PTRN test

2. Press the Test switch while this test indicator is On. The

indicator.

PTRN LED Flashes during initialization of the test and turns
On solid once the test is in progress.

To terminate this test, press the Test switch.

22 DSU 5600 User Manual 61200.078L1-1

REMOTE TESTS

Chapter 3. Test Modes

The DSU 5600 responds to three remote activated tests:

• Remote Digital Loopback (RDL)

• CSU Loopback (LL)

• DSU Loopback (RT)

The RDL test is initiated by a remote DSU and causes the local
DSU 5600 to loopback. The loopback point is the same as the
Loop Only point shown in Figure 3-4. This test is run to test the
end-to-end performance of the circuit.

Both the CSU Loopback and the DSU Loopback tests are acti­vated from the telephone company diagnostic test equipment
and are used to isolate trouble on a circuit.

The CSU Loopback, commonly called the LL test, has the same
loopback points as the DTE and Loop test. It is used by the
telephone company to test the integrity of the local loop.

The DSU Loopback, commonly called the RT test, has the same
loopback point as the Loop Only test and is used by the tele­phone company to test the operation of both the local loop and
DTE interface sections.

61200.078L1-1 DSU 5600 User Manual 23

Chapter 3. Test Modes

24 DSU 5600 User Manual 61200.078L1-1

Specifications Summary

SPECIFICATIONS AND FEATURES

This section describes the standard specifications and features
incorporated in the DSU 5600.

Loop Interface

4-wire, full duplex

Line Requirements

Local loop specifications per AT&T Pub 62310

Chapter 4. Specifications Summary

Chapter 4

Loop Rates

56 kbps or 64 kbps

Receiver Sensitivity

-45 dB

DTE Interfaces

EIA-232 synchronous or asynchronous

DTE Data Rates

• 1.2 kbps, 2.4 kbps, 4.8 kbps, 9.6 kbps, 19.2 kbps, 38.4 kbps, or

57.6 kbps asynchronous

• 56 kbps or 64 kbps synchronous

DTE Operating Modes

Full or half duplex

61200.078L1-1 DSU 5600 User Manual 25

Chapter 4. Specifications Summary

Diagnostics

• Network test center activated

- CSU loopback on sealing current reversal in local loop

- DSU loopback

• User activated

- Self test

- Local loopback

- V.54 activated remote loopback with:
2047 test pattern
DTE data/data from external test set

Power

115 VAC
4 Watts (maximum)

Environment

• Temperature

- Operating 0°C to 50°C (32°F to 122°F)

- Storage -20°C to 70°C (-4°F to 158°F)

• Relative Humidity up to 95%, non-condensing

26 DSU 5600 User Manual 61200.078L1-1

Index

Index

Symbols

2047 Test Pattern 16

A

ALM Indicator 2, 13

B

Back Panel 5

C

Carrier Detect 2, 10
CD Indicator 2, 10
Clear To Send 2
CS Indicator 2
Customer Service 8

D

Data Set Ready 10
Diagnostics 26
Digital Loopback Test 21

with Test Pattern 21

DTE

Operating Modes 25

DTE and Loop Test

Diagram 19
DTE Data Rates 25
DTE Indicator 2, 13, 16

DTE Interface 1, 2, 8, 25
DTE Only Test Diagram 15
DTE Status 2
DTE with Test Pattern 13

Diagram 17

E

Environment 26
Error

Indicator 3, 13, 16
Inject 16

F

Far End Test 21

I

Indicator

ALM 2, 13
CD 2, 10
CS 2, 9
DTE 2, 13, 16
Error 3, 16
LED 8
Loop Test 3
PTRN 3, 21, 22
PTRN test 16
RD 2
RDL 3, 10

61200.078L1-1 DSU 5600 User Manual 27

Index

Remote Digital Loopback 21
RS 2, 13
SR 10
TD 2

Inject Error 16

L

LED

Indicator 8

Test Pattern 13
Line Requirements 25
Loop Interface 25
Loop Interface Test 3
Loop Only Test 20
Loop Rate 25

N

Network Status

Indicator 2

O

Options 4

P

Parameters 4
Pattern

2047 16

Generator 3
Power 8, 26

Cord 5, 8
Primary EIA-232 12
Prom Checksum Failure 13
PTRN Test Indicator 3, 13, 16, 21, 22

R

RD Indicator 2
RDL Indicator 3, 10, 21
Rear Panel 4
Receive Data 2

Receiver Sensitivity 25
Remote

Digital Loopback Test 3
Request To Send 2
RS Indicator 2, 13

S

Select Switch 22
Self Test 8
SR Indicator 10
SW 1 8
SW 2 8
SW 3 8
SW 4 9
SW 5 9
SW 6 10
SW 7 10
SW 8 10
Switch

Options 4

Select 22

Test 3, 21

T

TD Indicator 2
Test

DTE Interface 2

Far End 21

Loop Interface 3

Loop Only 20

Pattern Detector 16

Pattern Generator 16

Remote Digital Loopback 3

Self 8

Status 2

Switch 3, 21, 22
Transmit Data 2

28 DSU 5600 User Manual 61200.078L1-1

Product Support Information

Presales Inquiries and Applications Support

Please contact your local distributor, ADTRAN Applications
Engineering, or ADTRAN Sales:

Applications Engineering [phone]
Sales [phone]

Post-Sale Support

Please contact your local distributor first. If your local distribu­tor cannot help, please contact ADTRAN Technical Support and
have the unit serial number available.

Technical Support (888) 4ADTRAN

Repair and Return

If ADTRAN Technical Support determines that a repair is
needed, Technical Support will coordinate with the Return
Material Authorization (RMA) department to issue an RMA
number. For information regarding equipment currently in
house or possible fees associated with repair, contact RMA
directly at the following number:

RMA Department [phone]

Identify the RMA number clearly on the package (below ad­dress), and return to the following address:

ADTRAN, Inc.
RMA Department
901 Explorer Boulevard
Huntsville, Alabama 35806

RMA # _____________