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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

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3 REPLIES
Hall of Fame Super Gold

AIS vs Remote Alarm Question

DUPLICATE POST

Hall of Fame Super Gold

AIS vs Remote Alarm Question

I haven't seen these alarms for 7 years now.

AIS, from what I was told, stands for Alarm Indicative State.  It's also called as BLUE alarm for ATM.

"Remote Alarm" is also knowns as the RED alarm when speaking about ATM.  It's similarly called as "Remote Indicative State".

Blue alarm is LOCAL while Red alarm is Remote.

This means that you have a layer 1 issue nearest the router.

Silver

AIS vs Remote Alarm Question

Well, think that the AIS is Alarm Interrupt Signal, it means that your transmission failed, and you receive an alarm indicating that. But this alarm can be received in the equiptament that does the NT (netowrk termination that the connects to the frame switch.

But imagine this scenario:

Router-NT-SPSwitch- NT- Router

You can receive AIS from any point? Right? So how do you deiferentiate the alarm? Remote alarm usualy is related when one end-point (router in this scenario) losses signal. But you continue to receive the signal from the SPSwitch, so one router has signal and the other don´t. AIS is related that you don´t have 2 way communication, you have lost your upload signal, and you destination reply with AIS to alert that you lost your TX.

I hope that this helps.

Cheers

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Posted by WebUser Pedro Seabra Ávila from Cisco Support Community App

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