Verilink SCC 2130 (880-503282-001) Product Manual User Manual

Page 65

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Diagnostics

Verilink SCC 2130 User Manual

5-11

Repeater Loopback

The repeater loopback test takes the transmit data just as it is
about to leave the network port of the CSU and feeds it directly into
the receive circuitry of the CSU. If the CSU is transmitting bad data,
it will now receive bad data and the problem will be located (the
CSU). If the CSU is transmitting good data but the receive circuitry
is defective, the signal received will fail and the CSU will declare an
alarm.

Use the R command on the Diagnostics Menu to initiate a repeater
loopback. A warning message appears:

Service Affecting, Are you sure ? (Y/N)

Service Affecting, Are you sure ? (Y/N)

Service Affecting, Are you sure ? (Y/N)

Service Affecting, Are you sure ? (Y/N)
Press “y” because you are sure. During a repeater loopback test the
NET LED on the CSU should be green and the EQPT LED should be
amber. The STAT LED will usually turn red because of a transient
bit error condition which occurs at the instant the test begins.
Ignore the STAT LED when conducting loopback tests on a CSU.

If the EQPT LED blinks amber to red during a repeater loopback,
errors are being detected in the DSX-1 data presented by the local
equipment. Verify cabling and option compatability.

If the NET LED is not green during a repeater loopback test, please
contact Verilink Technical Support for assistance.

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