Paradyne DSU 7511 User Manual
TM
Model 7511 Dual DSU
Startup Instructions
Document Number 7511-A2-GN10-10
January 1999
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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:
7511-A2-GB20
Model 7511 Dual DSU User’s Guide
7511-A2-GN10-10
A Model 7511 DSU
A backplate bearing two 25-pin connectors
Two V.35 adapter cables
January 1999
1
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,
Assignments,
in the User’s Guide.
Installing the Dual DSU
Cables and Pin
496-15104
Configuring the DSUs
Before you install your DSU, read the
page 13.
!
HANDLING PRECAUTIONS FOR
Important Safety Instructions
beginning on
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.
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
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.
January 1999
7511-A2-GN10-10
S2
S1
8
7
6
5
8
4
7
3
6
2
5
1
4
3
ON
2
1
ON
8
7
6
5
8
4
7
3
6
2
5
1
4
3
ON
2
1
ON
S4
S3
Figure 1. Model 7511 Switch Locations
S5
8
7
6
5
4
3
2
1
ON
97-15396
Table 1. Configuration Options (1 of 5)
Switch
Line Rate
S1-1 (DSU A)
S3-1 (DSU B)
ON ON
S1 S2
S3 S4
ON ON
DSU A
DSU B
Options and Usage Default in Bold
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.
7511-A2-GN10-10
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Table 1. Configuration Options (2 of 5)
Switch Options and Usage
TX Timing Source
S1-2 & S1-3 (DSU A)
S3-2 & S3-3 (DSU B)
T en-Minute Test
Abort Timer
S1-4 (DSU A)
S3-4 (DSU B)
ON ON
S1 S2
S3 S4
ON ON
ON ON
S1 S2
S3 S4
ON ON
The timing source for the DSU.
Off Off DDS
DSU A
For DDS, both switches must be Off.
For LADS:
Off ON Receive
Receive means timing is derived from the line receive signal.
DSU B
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.
Determines whether user-initiated tests automatically terminate after
10 minutes.
DSU A
Off Enable
Tests terminate automatically after 10 minutes.
ON Disable
Tests run indefinitely.
DSU B
Default in Bold
Network-Initiated
DSU Loopback
S1-5 (DSU A)
S3-5 (DSU B)
4
ON ON
S1 S2
S3 S4
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.
DSU A
Off Enable
The DSU responds to loopback sequences.
ON Disable
DSU B
The DSU ignores loopback sequences.
January 1999
7511-A2-GN10-10
Table 1. Configuration Options (3 of 5)
Switch Options and Usage
64CC Data Scrambler
S1-6 (DSU A)
S3-6 (DSU B)
V.54 Sequence
Detection
S1-7 (DSU A)
S3-7 (DSU B)
ON ON
S1 S2
S3 S4
ON ON
ON ON
S1 S2
S3 S4
ON ON
Determines whether the DSU scrambles data to minimize the possibility
of the remote DSU falsely recognizing a loopback command.
DSU A
Off Disable
Data scrambling is disabled.
ON Enable
Data scrambling is enabled.
DSU B
Determines whether the DSU responds to V.54 Loop Up and Loop
Down sequences from the remote DSU.
DSU A
Off Disable
V.54 loop sequences are ignored.
ON Enable
The DSU responds to V.54 loop sequences.
DSU B
Default in Bold
Invert
TX Clock
S1-8 (DSU A)
S3-8 (DSU B)
ON ON
S1 S2
S3 S4
ON ON
Determines whether the DSU clock provided on interchange circuit
CT1 14 (TXC) is phase-inverted with respect to interchange circuit
CT103 (TXD). This can reduce errors encountered due to excessive
DSU A
cable lengths.
Off Normal
TXC is not inverted.
ON Invert
DSU B
TXC is inverted with respect to TXD.
7511-A2-GN10-10
January 1999
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