Verilink SCC 2130 (880-503282-001) Product Manual Manual de usuario descargar pdf (Pagina 63)

Diagnostics

Verilink SCC 2130 User Manual

-9

Far End Loop

To begin the verification, use the

Inband Up

command on the

Diagnostics Menu.

This causes the local CSU to transmit a loop-up

code in the direction of the far end CSU

Figure 5-3 Sending Loop-up Code.

If the loop-up code reaches the far CSU and it is optioned to

respond to loop-up codes, then the far CSU enters a line loop

condition. Now the local CSU receives whatever it is sending.

NOTE:

Whenever the Inband Up command is used to send a loop-up

code to a far end CSU, the Inband Down command must be

used later to send the loop-down code. Otherwise the far end

CSU will be left in a looped condition.

Sending A Pattern

Begin transmitting a test pattern by using the

qrss

command.

Verify that the pattern received matches the pattern being

transmitted by using the

show cntr

command.

Figure 5-4 Sending And Receiving Pattern

If the QRSS pattern is received with no errors, the Test Error

Counter will not increment.

If the Test Error Counter does increment, one of the following

applies:

•

The far end CSU never went into a loopback and therefore the

test pattern being transmitted is not being received at all. This

would cause the Test Error Counter to increment at a rapid and

steady rate.

•

The far end CSU did go into a loopback, but the pattern

received at the local SCC 2130 does not match the pattern

transmitted. In this case the Test Error Counter might

increment in uneven amounts at virtually any rate.

Loop-up code

Far CSU

Local SCC 2130

Test pattern sent

Far CSU

Test pattern received

(in Line Loop)

Local SCC 2130

Sends pattern

Checks pattern

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 72 73

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Verilink SCC 2130 (880-503282-001) Product Manual Manual de usuario Pagina 63

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