Alarm Conditions (Overview) - 3Com 3C10402B Administrator's Manual

434 C 18: T
HAPTER ROUBLESHOOTING
Alarm Conditions
(Overview)
by the Central Office or by test equipment emulating Central Office
equipment. For more information about how to enable loopback tests,
see "Using Loopback Tests"
After you complete the configuration, and with the loopback connector
in place, verify that the Nominal status light (3C10165C E1 card or
3C10116C T1 card) on the front panel of the Digital Line Card is turned
on (appears steady and green). For the 3C10165D E1 card and
3C10116D T1 card, make sure the CO status light is green.
If the Nominal or CO status light does not turn on, the problem is
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most likely in the Digital Line Card. Contact your 3Com
Voice-Authorized Partner to report the problem.
If the Nominal or CO light turns on, the problem is either in the CSU
■
(Channel Service Unit) or in the telephone company's line. Contact the
telephone company for assistance.
The 3C10165D E1 Card and the 3C10116D T1 card each have an
onboard CSU. You can view CSU statistics for the card through the NBX
NetSet utility. For more information see
and Statistics" on page
T1 and E1 Digital Line Cards might experience these alarm conditions:
Red Alarm — Indicates one of these conditions:
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Loss of Signal (LOS)
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Loss of Framing (LOF) also known as Out of Frame (OOF)
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Blue Alarm — Indicates an Alarm Indication Signal (AIS)
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Yellow Alarm — Indicates a Remote Alarm Indication (RAI)
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An alarm condition might be one of these:
Signal — Information transmitted either in the upstream or
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downstream direction, warning of a detected failure:
State — A condition, activated at a terminal device, indicating that a
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problem exists and remedial action is required.
T1 and E1 Digital Line Cards are considered "downstream" equipment.
on page 188.
"Viewing CSU State Information
185.