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September 1999 P/N 880-503284-001-A1 - page 53 / 65





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Starts 1 in 8 test.

CSU transmits a 1-in-8 pattern, which guarantees one bit of every 8 will be a one, while monitoring the receive pair for the same signal to be returned.

This test pattern is valid for all T1 circuit types.

Menu Option

3) 1 in 8

4) all 1

Starts all ones patter

Use of this pattern is suggested whenever

any T1 circuit is tested.

n. The CSU transmits a framed pattern of all ones and monitors receive data for the same pattern.

B e c a u s e i t p r o d u c e s m a x i m u m c u r r e n t l e v e l s , t h i s t e s t i s especially good at finding some problems like bad repeater cards or resistive punchdown connections.

All ones is a valid test on all T1 circuits.

L) line

Initiates a line loopback.

Line loopback faces the T1 circuit. All data received from the T1 circuit is sent back to the T1 circuit.

This is the same loopback which occurs when a CSU receives a loop-up code from the network.

P) payload

U) inband up

Initiates a payload loopback.

Payload loopback faces the T1 circuit like the line loopback.

A payload loopback passes through more of the CSU circuitry while the line loopback occurs closer to the network port.

Sends a standard CSU loop-up code toward the far end CSU.

Under normal circumstances, sending the line loop-up code will cause the far end CSU to enter a line loopback state.

D) inband down

Sends a standard CSU loop-down code to the far end CSU.

Under normal circumstances, sending the line loop-down code will terminate a line loopback state in the far end CSU.

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