Base Code Self-Test; Field-Programmable Gate Array (Fpga) Testing; Outgoing Calls Attempted/Completed Mismatch - Nortel 1000 Fundamentals

Base code self-test

The IP trunk card base code performs the following tests:
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Field-Programmable Gate Array (FPGA) testing

Before communicating with the system, the 8051XA controller downloads
FPGA and performs tests to check correct programming of the FPGA.

Outgoing calls attempted/completed mismatch

The difference between the attempted and completed outgoing call numbers
should never be less than the sum of the QoS Fallback, Address Translation
fallback, and Calls Rejected fallback (totaled as "Outgoing Fallback"). It
may be more. A caller may release a call before the attempt reaches the
far node, but since the originator released before the call could complete, it
might not even be recorded as an attempt by the remote ITG card.
For example, a user dials a valid ESN AC1 and LOC, but an incorrect
DN (with an incorrect last digit). As soon as the user dials the digit, he or
she realizes the mistake and releases the call. The SETUP message has
already gone to the ITG card, but the call is cleared before the H.323 SETUP
message traversed the IP network, so no call reaches the destination. An
outgoing attempt has been made and cleared, so no fallback occurred and
no call attempt is recorded at the destination.
The main reasons for valid completed call mismatches are:
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Copyright © 2007, Nortel Networks
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flash integrity test
PGA read/write test
PC Card controller test (also tests the PCI bus)
timer and DMA tests
DSP test
Time of day that the statistics were last read and cleared may vary.
This is the most common reason for mismatch. For example, although
both ITG cards were read at 10:00, it is important to know if the clocks
are synchronized, and when statistics were last cleared. A one-minute
discrepancy could mean quite a few calls in the difference. Therefore,
the first eight calls of one card may have already been counted for the
other card. The statistics are more reliable when looked at over the day.
"Messages in flight"
This ranges from trivial to extreme. In the extreme case, if a CONNECT
message is delayed several tenths of seconds (or even seconds) by
traffic bursts, the snapshot may occur while the CONNECT message
is still traversing the network. Therefore, one or more calls is still
unaccounted for. In the trivial case, even in a lightly loaded network, it
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Outgoing calls attempted/completed mismatch 409