Paradyne 7510 DSU manual DSU or Internal Network Loopback, Send V.54 Up/Down Sequences

Testing

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.

DTE Port

DSU CSU

Aggregate

DTE

Interface

DDS

Network

Port

DSU Loopback 496-15160

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:

￿In-band V.54 Up (activation) code to request a Remote DSU Loopback (V.54 Loop 2) at the remote DSU, or

￿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 on page 5-3 for an example of the Network

Tests screen.

7510-A2-GB20-10 November 1997 5-5