Overload Resources - Nortel DMS-100 Series Maintenance Manual

1-58 Maintenance overview
Internal loop test This test checks the integrity of LTC+ speech channels.
If the LTC+ is out of service (OOS), a full test on every channel is run. If
the LTC+ is InSv, the test checks two speech channels selected at random.
The internal loop test also checks the operation of LTC+ PCM
enable/disable gates.
LTC P-side link diagnostic
The P-side link diagnostic consists of the following separate tests:
Hardware presence test This test checks for the message and
timeswitch cards in the LTC+. These cards are necessary for the other
P-side link diagnostic tests to run. If any of these cards are not present, the
diagnostic returns a
log report.
P-side interface presence test This test is the same as that in the
speech path diagnostic. It ensures that all LTC+ P-side links to be tested are
still present. This test flags missing or failed NT6X48 or NT6X50 cards in
the LTC+.
Full peripheral test After the first two tests in the P-side link diagnostic,
this test ensures necessary hardware is present. The full peripheral test
checks one speech channel on each specified LTC+ P-side link to the
RLCM-EDC. This test is run only if the LTC+ is in active mode.
RLCM-EDC facility maintenance
When line diagnostics are invoked for RLCM-EDC-supported lines and the
RLCM-EDC has no serving LTU or MTU, the RLCM-EDC executes the
no-LTU diagnostic. This software establishes a connection to a transmission
test unit (TTU) in the host office, which uses this circuit for limited line
testing in place of the LTU or MTU.

Overload resources

Overload resouces for the RLCM-EDC is implemented in two categories:
overload detection and overload control.
Overload detection
Detection is based on monitoring the size of message queues to certain key
Call–processing tasks. If the size of these queues exceeds a threshold, the
overload controls are initiated. There are two threshold levels, low and high,
and both are implemented with hysteresis, (exit criteria are more stringent
297-8381-550 Standard 02.02 April 1999
hardware presence test
P-side interface presence test (DS30A and DS-1 link interfaces)
full peripheral test
No Resources
error message and produces a PM181