Paradyne Dual DSU 7511 User manual

7511-A2-GN10-10 January 1999

Model 7511 Dual DSU

Startup Instructions

Document Number 7511-A2-GN10-10

January 1999

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Select the following document:

7511-A2-GB20

Model 7511 Dual DSU User’s Guide

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Within the U.S.A., call 1-800-PARADYNE (1-800-727-2396)

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Preparation

Make sure you have:

A clean, well-lit, and ventilated site that is free from environmental extremes.

One to two feet of clearance for cable connections.

An operable network connection.

Package Checklist

Verify that your package contains the following:

A Model 7511 DSU

A backplate bearing two 25-pin connectors

Two V.35 adapter cables

2 7511-A2-GN10-10

January 1999

Cables You May Need to Order

You will need cables to connect your Network Interface Module (NIM) to the

network and your 7511 DSUs to DTEs. For further information refer to the

documentation shipped with your NIM, and Appendix A,

Cables and Pin

Assignments,

in the User’s Guide.

Installing the Dual DSU

Before you install your DSU, read the

Important Safety Instructions

beginning on

page 13.

!HANDLING PRECAUTIONS FOR

STATIC-SENSITIVE DEVICES

The Model 7511 Dual DSU is designed to protect sensitive components

from damage due to electrostatic discharge (ESD) during normal

operation. When performing installation procedures, however, take

proper static control precautions to prevent damage to equipment. If

you are not sure of the proper static control precautions, contact your

nearest sales or service representative.

Configuring the DSUs

Procedure

To configure the Model 7511 Dual DSU:

1. Review Table 1 to determine the proper settings for your environment.

The first choice for each option (shown in boldface type) is the factory

default setting. If you choose the factory default value, you do not need to

change the position of the associated switch.

2. Mark any options in the table that you wish to differ from the factory default.

3. Using Figure 1 and Table 1, verify that the switch settings of each DSU on the

7511 card match your selections.

Do not modify the settings of switches not listed in the table. Any switch

not designated for customer use should be in the Off position.

4. Where required, verify that the local and remote DSUs employ the same

options. For example, both the local and remote DSU must use the same

Line Rate and 64CC Data Scrambler settings.

496-15104

7511-A2-GN10-10 January 1999

97-15396

12345678

S3 S4

Figure 1. Model 7511 Switch Locations

Table 1. Configuration Options (1 of 5)

Switch Options and Usage Default in Bold

Line Rate

S1-1 (DSU A)

S3-1 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

DDS or LADS line rate.

Off 56 kbps

The line rate is 56 kbps.

ON 64 kbps

LADS: The line rate is 64 kbps.

DDS: The line rate is 64 kbps clear channel.

4 7511-A2-GN10-10

January 1999

Table 1. Configuration Options (2 of 5)

Switch Options and Usage Default in Bold

TX Timing Source

S1-2 & S1-3 (DSU A)

S3-2 & S3-3 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

The timing source for the DSU.

Off Off DDS

For DDS, both switches must be Off.

For LADS:

Off ON Receive

Receive means timing is derived from the line receive signal.

ON Off Internal

Internal means timing is provided by the unit’s internal clock.

ON ON External

External means timing is provided by the DTE.

Ten-Minute Test

Abort Timer

S1-4 (DSU A)

S3-4 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines whether user-initiated tests automatically terminate after

10 minutes.

Off Enable

Tests terminate automatically after 10 minutes.

ON Disable

Tests run indefinitely.

Network-Initiated

DSU Loopback

S1-5 (DSU A)

S3-5 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines whether the DSU responds to DSU latching loopback start

and stop sequences sent by the network. This option is applicable only

if the DDS line rate is 64 kbps clear channel.

Off Enable

The DSU responds to loopback sequences.

ON Disable

The DSU ignores loopback sequences.

7511-A2-GN10-10 January 1999

Table 1. Configuration Options (3 of 5)

Switch Options and Usage Default in Bold

64CC Data Scrambler

S1-6 (DSU A)

S3-6 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines whether the DSU scrambles data to minimize the possibility

of the remote DSU falsely recognizing a loopback command.

Off Disable

Data scrambling is disabled.

ON Enable

Data scrambling is enabled.

V.54 Sequence

Detection

S1-7 (DSU A)

S3-7 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines whether the DSU responds to V.54 Loop Up and Loop

Down sequences from the remote DSU.

Off Disable

V.54 loop sequences are ignored.

ON Enable

The DSU responds to V.54 loop sequences.

Invert

TX Clock

S1-8 (DSU A)

S3-8 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines whether the DSU clock provided on interchange circuit

CT114 (TXC) is phase-inverted with respect to interchange circuit

CT103 (TXD). This can reduce errors encountered due to excessive

cable lengths.

Off Normal

TXC is not inverted.

ON Invert

TXC is inverted with respect to TXD.

6 7511-A2-GN10-10

January 1999

Table 1. Configuration Options (4 of 5)

Switch Options and Usage Default in Bold

CTS

S2-1 & S2-2 (DSU A)

S4-1 & S4-2 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines the operation of interchange circuit CT106, Clear to Send

(CTS).

Off Off Standard

CTS follows RTS with a fixed delay except when an alarm is detected

or a test is active, when CTS is turned off.

Off ON Circuit Assurance

Same as standard, but CTS is also turned off when Carrier Mode Idle

codes are received.

ON Off Follow RTS

CTS follows RTS without delay, regardless of alarms and tests.

ON ON Forced On

CTS is forced on after a successful self-test.

RTS

S2-3 (DSU A)

S4-3 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines the operation of interchange circuit CT105, Request to

Send (RTS).

Off Constant

The internal RTS is forced on and the DSU is in a constant data mode.

The transmitted signal is either Data Mode Idle codes or DTE data.

ON Switched

RTS is monitored, and Carrier Mode Idle codes are transmitted when

RTS is off.

LSD

S2-4 (DSU A)

S4-4 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines the operation of interchange circuit CT109, Line Signal

Detect (LSD).

Off Standard

LSD is on when the receive line is in data mode, and off when an alarm

is detected or Carrier Mode Idle codes are received.

ON Forced On

LSD is forced on after a successful self-test.

7511-A2-GN10-10 January 1999

Table 1. Configuration Options (5 of 5)

Switch Options and Usage Default in Bold

DSR

S2-5 (DSU A)

S4-5 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines the operation of interchange circuit CT107, Data Set Ready

(DSR).

Off Standard

DSR is always on, except when an alarm is detected or a test is active.

ON Forced On

DSR is forced on after a successful self-test.

511 Test

Pattern

Generation

and

Monitoring

S2-6 (DSU A)

S4-6 (DSU B)

S1 S2

S3 S4

DSU A

DSU B

ON ON

Determines whether the DSU will generate and monitor a 511 test

pattern in remote loopback tests.

Off Enable

A 511 pattern is generated and monitored during the remote loopback

test.

ON Disable

A 511 pattern is not generated. External test equipment is required to

perform a Bit Error Rate test.

CT141

S5-1 (DSU A)

S5-3 (DSU B)

DSU A

DSU B

ON Determines whether a local digital loopback can be controlled by the

DTE using interchange circuit CT141, Local Loopback (LL). If enabled,

the DTE port remains in loopback while LL is on.

Off Disable

The DSU will not initiate the loopback on command from the DTE.

ON Enable

The DSU initiates the loopback.

CT140

S5-2 (DSU A)

S5-4 (DSU B)

DSU A

DSU B

Determines whether a remote digital loopback can be controlled by the

DTE using interchange circuit CT140, Remote Loopback (RL). If

enabled, the remote DSU must be able to detect the in-band V.54

loopback sequence.

Off Disable

The DSU will not initiate the loopback on command from the DTE.

ON Enable

The DSU initiates the loopback.

8 7511-A2-GN10-10

January 1999

Installing the Rear Connector Plate

Procedure

To install the rear connector plate:

1. At the rear of the carrier, place the tab on the connector plate in its slot in the

carrier’s backplane. The connector plate must use the same slot position

intended for the DSU card.

2. Loosely fasten the screw, allowing for a slight adjustment when installing the

DSU card.

97-15484

V.35 V.35

25-Pin

DTE Connectors

P21

7511-A2-GN10-10 January 1999

Installing the DSU Card

Procedure

To install the Model 7511 Dual DSU:

1. Using a Phillips screwdriver, loosen the screw holding the circuit pack lock.

Rotate the lock to the open position and open the latch.

Circuit

Card

Guides

Circuit

Pack

Lock

Latch

Open

(Unlocked)

Closed

(Locked)

495-14813

2. At the front of the carrier, hold the circuit card vertically with the latch on its

faceplate in the open position. Then insert the circuit card into the top and

bottom circuit card guides.

10 7511-A2-GN10-10

January 1999

495-14797

3. Slide the circuit card into the slot and press until the connectors are seated

firmly into the back of the carrier.

4. If power is applied to the carrier:

— All LEDs on the card light up momentarily.

— The card completes its power-up self-test.

— The Alarm and OK LEDs are turned off or on depending on the test

results.

5. Press the faceplate latch to secure the circuit card.

6. Rotate the circuit pack lock into the closed position, and tighten the screw.

7. Return to the rear of the carrier and tighten the screw on the rear connector

plate.

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