Nortel Networks NN43001-563 - Manual (Page 407)

Outgoing calls attempted/completed mismatch 407
BIOS self-test
The IP trunk card contains its own VxWorks-based BIOS. At power-up, the
BIOS performs its own initial test of the hardware. These tests cover the
processor, PCI chipset, cache (if installed), and DRAM memory. The results
of the BIOS self-test are displayed on the RS-232 maintenance port.
Base code self-test
The IP trunk card base code performs the following tests:
• flash integrity test
• PGA read/write test
• PC Card controller test (also tests the PCI bus)
• timer and DMA tests
• DSP test
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:
• 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"
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.