Yellow Alarm - This is an all ones signal coming into the PM3. This
comes from the network to signal there is a problem in the opposite (the
transmit of the PM3) direction.
Blue Alarm - This is also an all ones signal coming into the PM3,
however this signal is generated by a piece of network equipment to
signal there is a problem coming into it. An intelligent piece of
equipment won't pass a bad signal, and sends an all ones to keep the
span alive.
Receive Carrier Loss - loss of received signal, or Red Alarm
Loss of Synch - This is a gray area. Livingston says it means there were
192 consecutive zeroes. I would think it means it did not find the
framing bit where it expected to.
Bi-Polar - T1's use Alternate Mark Inversion, a bi-polar signifies there
were two consecutive pulses of the same polarity.
CRC - only valid with ESF spans. This is the CRC-6 check that is done in
the ESF overhead.
Multiframe Sync - your guess is as good as mine
>
> I had 14 yellow alarms and 343 crc violations last nite on my line0, line1
> was all zeros. Do I have a problem here? I read the URL below, but didn't
> really find meaningful answers.
Yellow alarms indicate trouble in your transmit direction. The CRC's
were probably caused by the span going into and coming out of the Yellow
alarm state.
I have a T1 primer out there. It should be in the archives and is also
available at
http://pmr.infinet.net/T1.html
-- Kyle Platts Network Engineer !NTERPRISE Networking Services U S WEST Communications - To unsubscribe, email 'majordomo@livingston.com' with 'unsubscribe portmaster-users' in the body of the message. Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>