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AIS vs Remote Alarm Question

Hello,

I work for a company that provides WAN connection to  very large well known companies. I have always wondered what the  difference is between an AIS alarm and a Remote alarm. The ones that I  am speaking of are lised in the output when the following command is  issued, "sh service-module serialx/x/x.

I know that the  AIS alarm is an alarm from upstream beyond the frame switch, but what  is the remote alarm for? I see it increment often at different sites.

Example:

0839wampls#sh service-module s0/3/0

Module type is T1/fractional

    Hardware revision is 1.2, Software revision is 20060719,

    Image checksum is 0x3EB2C1, Protocol revision is 0.1

Receiver has no alarms.

Framing is ESF, Line Code is B8ZS, Current clock source is line,

Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.

Last module self-test (done at startup): Passed

Last clearing of alarm counters 03:54:55

    loss of signal        :    0,

    loss of frame         :    1, last occurred 03:54:45

    AIS alarm             :    1, last occurred 03:54:45                   <------------------------------------------  AIS Alarm

    Remote alarm          :     0,                                                   <------------------------------------------  Remote Alarm

    Module access errors  :    0,

Total Data (last 15 15 minute intervals):

    0 Line Code Violations, 0 Path Code Violations

    0 Slip Secs, 13500 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 13500 Unavail Secs

Data in current interval (583 seconds elapsed):

    0 Line Code Violations, 0 Path Code Violations

    0 Slip Secs, 365 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

    0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 365 Unavail Secs

  • WAN Routing and Switching
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AIS vs Remote Alarm Question

DUPLICATE POST.

New Member

AIS vs Remote Alarm Question

AIS (Alarm Indication Signal) is a "all-ones" signal indicating a disruption of incoming T1 signal.

Remote alarm, often referred to as "yellow alarm", is sent in the opposite direction of AIS.

A device receiving AIS will transmit a yellow alarm back out.

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