Nortel Communication Server 1000 Fundamentals page 29

T1 monitoring
MCR keeps performance statistics for the current hour and for each hour
in the past twenty-four. MCR's T1 framer chips monitor the performance
of the T1 links. Once a second MCR reads the framer registers and keeps
a record of the following statistics:
•
Errored Second — 1 or more CRC-6 errors or 1 or more out of frame
(OOF) conditions during the second
•
Bursty Second — More than 1 but less than 320 CRC-6 errors during
the second
•
Severely Errored Second (SES) — 320 or more CRC-6 errors or 1 or
more out of frames (OOF) during the second (not displayed)
•
Unavailable Seconds (UAS) — Unavailable state starts with 10
consecutive SES and ends with 10 consecutive non-SES
•
Controlled Frame Slip Seconds — 1 or more frame slips during the
second
•
Loss of Frame Count — Loss of Frame or Loss of Signal for 3
consecutive seconds
When the T1 framer is configured for D4 operation, the firmware uses
bi-polar violations instead of CRC-6 errors. When using bi-polar violations,
the total number of bi-polar violations are used as CRC-6 errors in the
above calculations.
In addition to the above performance statistics, the firmware keeps a total
error counter for each carrier. The error counter is a count of the CRC-6
errors + frame slips + out-of-frame (OOF). This counter counts from 0 to
65,535. Once reaching 65,535 the counter is not incremented further. The
counter can be reset to 0 by entering the CLEAR ERROR (C E) command.
Emergency Stand-Alone Mode
Emergency Stand Alone Mode (ESAM) is a Mini-Carrier Remote feature
that provides limited telephone service to 16 digital telephones and 8
XUT ports. The RMI has a faceplate toggle switch that determines ESAM
functionality for the board. The toggle-switch can force ESAM mode to
be active at all times or allow ESAM to be automatically activated. When
the switch is set to ESAM, ESAM mode will always be active. When set
to NORM, automatic selection is enabled and the MMI configuration will
control ESAM's activation. At the MMI, ESAM can be set to always be
enabled, never be enabled, or activate when alarm level 2 is reached on
all carriers.
The following models of the Meridian Digital Telephone support ESAM:
Copyright © 2003-2010 Nortel Networks. All Rights Reserved.
Nortel Communication Server 1000
Mini-Carrier Remote Fundamentals
NN43001-557 04.01 4 June 2010
Functionality 29