Nortel Meridian SuperNode SL-100 Reference Manual page 38

2-14 IPE architecture
status inquiry commands, and performs automatic shutdown to prevent
hazardous thermal (high temperature) conditions.
Note: If the datalink between the SL-100 and a master XSM is unavailable,
the CC cannot determine any status information or fault reports from that
XSM and any of its slaves. Software to support the datalink on the SL-100
has not been introduced.
The XSM also performs the serial communication link between the master and
slave XSMs in other columns. If a fault is detected, the XSM displays alarm
Light Emitting Diodes (LEDs) on the top column cabinet. The XSM trips the
column circuit breakers or activates the tripping signals (for dc systems) when
the column exceeds the high-temperature threshold. The XSM alarms the
Power Fail Transfer (PFT) unit to activate the system line transfer when
required or when faults are detected.
Note: The PFT card performs a transfer of lines to outside lines directly,
bypassing the IPE line card. The PFT card is not supported in the SL-100
environment, but an XSM may still report information for them, in some
instances. Status messages for PFT cards are "Transferred" or "Not
Transferred". The SL-100 CC ignores reports concerning PFT card status.
The following figure shows the XSM configuration in the SL-100
environment.
555-4001-129 Standard 08.01 November 2000