Sanity Timer; Man-Machine Interface; Elei Additional Functionality - Avaya Nortel Communication Server 1000 Reference

NT5D33 and NT5D34 Lineside E1 Interface cards

Sanity Timer

The LEI also contains a sanity timer that resets the microcontroller in the event of a loss of
program control. If the timer is not properly serviced by the microcontroller, it times out and
causes the microcontroller to be hardware-reset. If the microcontroller loses control and fails
to service the sanity timer at least once per second, the sanity timer automatically resets the
microcontroller restoring program control.

Man-Machine Interface

The LEI provides an optional Man-Machine Interface (MMI) that is primarily used for E1 link
performance monitoring and problem diagnosis. The MMI provides alarm notification, E1 link
performance reporting, and fault isolation testing. The interface is accessed through
connections from the I/O panel to a terminal or modem. Multiple cards (up to 64) can be served
through one MMI terminal or modem by linking the LEIs through a daisy chain.
The MMI is an optional feature, because all E1 configuration settings are performed through
dip switch settings or preconfigured factory default settings. Available MMI commands, and
their functionality, are discussed in-depth in
software on page 222.

ELEI additional functionality

As mentioned earlier, ELEI cards are enhanced to allow CAS+ compliance, as shown in
45: CAS+ compliance
for systems with ELEI cards installed.
Note:
MDECTS and ELEI (operating in enhanced mode) cannot be configured on the same
system.
202 Circuit Card Reference
Man-Machine E1 maintenance interface
on page 203. This enhancement provides several additional benefits
Comments? infodev@avaya.com
Figure
July 2011