Nortel Networks NN43001-563 - Manual (Page 406)

406 Maintenance
IP trunk card self-tests
During power-up, the IP trunk card performs diagnostic tests to check
correct operation. Use the faceplate RS-232 port on the IP trunk card to
monitor these tests. IP Trunk 3.01 (and later) sends messages indicating
the completion of each phase of testing and any detected faults, to this port.
Additionally, the IP trunk card has a four-character LED dot matrix display
on the faceplate for the purpose of providing status information during
maintenance operations. At power-up and during diagnostic tests, this
display provides a visual indication of the status of the self-test and an
indication of the first failure detected. For more information about the
available Maintenance codes on the Media Card 32-port trunk card, see
"Media Card 32-port trunk card faceplate maintenance display codes" (page
421)
. For more information about the available Maintenance codes on
the ITG-Pentium 24-port trunk card, see "ITG-Pentium 24-port trunk card
faceplate maintenance display codes" (page 423) .
The 8051XA controller takes control of one of the RS-232 ports and uses
it to display the results of the power-up self-test and diagnostics on a
maintenance terminal.
The initial tests performed include the following:
• 8051XA controller self-test, including ROM checksum, onboard RAM,
and timer tests
• external data/program RAM and dual-port memory tests
Following the successful completion of these tests, the 8051XA controller
attempts to bring up the processor by clearing the reset state and entering a
timing loop in the anticipation of receiving a message from the processor.
If this loop times out, it outputs an error to the RS-232 port. It attempts to
bring up the processor two more times before indicating an unrecoverable
card failure.
Similarly, if a message is received from the processor, indicating a failure of
one or more of the circuit elements, up to two more resets are attempted.
The IP trunk card then enters the unrecoverable failure state. This
ensures that failures due to erratic power-up, or reset conditions, do not
cause an unnecessary failure of the card. When the processor responds
correctly, the 8051XA controller switches its serial port to provide Card LAN
communication and connects the processor to the external RS-232 port.
Card LAN
The IP trunk card supports the backplane Card LAN interface for
communicating self-test errors and allowing maintenance access, including
resetting the card remotely.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.