Paradyne 7510-A2-GB20-00 727 User Manual download pdf (Page 38)

Testing

5-5

7510-A2-GB20-00

March 1997

DSU or Internal Network Loopback

DSU loopback is an internal loopback that is located as closely as possible to the

customer interface serving the DTE.

" Procedure

To run a DSU loopback:

1. Position the cursor at the Start command next to DSU Loopback on the

Network Tests screen.

2. Press Enter.

3. The Start command is changed to Stop. If you want to manually stop the test,

verify that the cursor is positioned at the Stop command.

4. Press Enter. The duration of the test is displayed.

DSU CSU

DTE

Interface

Aggregate

DTE

Port

DDS

Network

Port

496-15160

DSU Loopback

Send V.54 Up/Down Sequences

The local DSU can send an ITU-T V.54 Up or Down sequence to request the

activation or termination of a DSU (digital) loopback of a remote unit. This is the

same as the DSU Loopback shown above except the test is activated remotely.

The DSU can send:

H In-band V.54 Up (activation) code to request a Remote DSU Loopback

(V.54 Loop 2) at the remote DSU or

H In-band V.54 Down (deactivation) code to request the termination of a

Remote DSU Loopback (V.54 Loop 2) at the remote DSU

" Procedure

To start or stop a remote DSU loopback:

1. Position the cursor at the Send command next to Send V.54 Up or Send V.54

Down on the Network Tests screen.

2. Press Enter.

Sending appears in the Status column followed (after 3 seconds) by

Command Complete at the bottom of the screen.

Refer to

Running Network Tests

for an example of the Network Tests screen.

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