Clock Synchronization; System Communications; Dual Messaging Channel Support - Nortel Meridian SuperNode SL-100 Reference Manual

Table 6-2 Controller card diagnostic tests (Sheet 3 of 3)
70D07AC
Test #
Note: On the 7D07Ac, test #17 network side continuity test requires a
working DS30A (8-kHz frame pulse and a 5.12-MHz clock) to be connected
to port 0 to pass; otherwise, it cannot execute and reports a failed condition.

Clock synchronization

After power up diagnostics have been executed, the controller card attempts to
synchronize with one of two network clocks. When lock is established, the
hexadecimal display indicates C0 or C1 for a successful lock to port 0 or 1,
respectively (see the "Display functions" section).
When an unlock condition occurs, the controller card attempts a hitless
switch-over to the other clock source. If a lock cannot be established the
hexadecimal display continuously indicates CF (clock failure) until a lock can
be established.
After CF is indicated and lock re-established, the controller card reinitializes
all peripheral devices. There are a maximum of six physical DS30 links to the
IPE numbered 0 through 5. Links 0, 1, 2, and 3 are cabled together with clock
and frame for port 0. Links 4 and 5 are cabled together with clock and frame
for port 4.

System communications

Dual messaging channel support

The IPE shelf is connected to the XPM (LGC/LTC/RCC) using a minimum of
two DS30A links. The first channel of the first two links is reserved for
messaging between the XPM and IPE. The controller card firmware supports
simultaneous messaging on both channels. If one messaging channel is
disabled by the XPM (Link Disable command) or link failure, then the
controller card switches to a single channel mode and routes all messages over
the remaining active messaging channel.
Meridian SuperNode MSL-100 Intelligent Peripheral Equipment (IPE) Reference Manual MSL14
Description
Feature implementation 6-17
7D07BA
Test # Description
34 R72 XIVD loopback
buffer test
35 Ethernet Transceiver
loopback test
36 Software load
checksum test