Black Box 5000 manual Testing the Network, Integral CSU/DSU

12.5 Testing the Network

In a Multiserver network, there are several loopback and test-pattern tests that you can use to diagnose the integrity of various segments of the network. The modules in a Multiserver have diagnostic tests initiated by those units; detailed information on each of those tests is in the individual module manuals. The following information is important to note when attempting to invoke a diagnostic loop for async data channels with

•an integral CSU/DSU,

•standalone CSU/DSU and modems,

•telco loops,

•link remote loops.

TESTING A CONNECTED ASYNC PORT (WITH NO

INTEGRAL CSU/DSU)

1.Log into the Command Mode and access the Async Channel Loopback test (option 1).

2.You may do either one of the following setups: a. • Select a remote echo test (option 2).

•Attach an async tester (i.e., a BERT) to the async port initiating the test.

•Type in some data. All data entered should be received on your display.

or

b. Select the remote fox (option 4). The message is automatically sent. It will be received and displayed.

CHAPTER 12: Diagnostics

TESTING AN ASYNC PORT (NOT CONNECTED, WITH NO INTEGRAL DEVICES LOOPED)

1.Log into the Command Facility Main Menu, Diagnostics (option 7). Select Link Channel Loopback (option 2). You will be promped for the link.

2.You may do either one of the following setups: a. • Select the remote echo (option 2).

•Attach an async tester (i.e., a BERT) to the async port initiating the test.

•Type in some data. All data entered should be received on your display.

or

b.Select the remote fox (option 4). The message is automatically sent. It should be received and displayed.

LOCAL LOOP CONDITIONS FOR TESTING THE INTEGRAL

CSU/DSU

(ASYNC CHANNEL IS NOT FORCE-CONNECTED)

Note

•This test will interrupt normal operation over the link.

1.Log into the Command Facility Main Menu, Diagnostics (option 7). Select Integral Device (option 6) and the desired loopback (option numbers depend on device installed).

2.At the Diagnostics Menu, select Link Channel Loopback (option 2) and the module location/channel number of the integral device.

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