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Does anyone know what layer 1 testing means?

Problem with ISDN (USA)

1 REPLY
Anonymous
N/A

Re: Does anyone know what layer 1 testing means?

There is no context in the question.

In general with ISDN, you should first have

a look at "sh isdn stat"; if layer1

is activated, you are good; if it's

Deactivated, there is a physical layer

problem (cisco port, cable, or carrier)

that can best be addressed by confirming

the circuit and changing ports and

cables.

Note that outside of North America, it's

often the case that layer1 is down in

between calls (ie the TEI is negotiated for

each call with the "isdn tei first"

call command).

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