Avaya Nortel Communication Server 1000 Reference page 156

NT5D11 and NT5D14 Lineside T1 Interface cards
- programmed unit parameter status
• receipt and implementation of card configuration:
- control of the T1 line interface
- enabling/disabling of individual units or entire card
- programming of loop interface control circuits for administration of channel operation
- maintenance diagnostics
• interface with the line card circuit:
converts on/off-hook, and ringer control messages from the DS-30X loop into A/B bit
manipulations for each time slot in the T1 data stream, using robbed bit signaling.
• the front panel LED when the card is enabled or disabled by instructions from the NT8D01
controller card.
Card LAN interface
Maintenance data is exchanged with the CPU over a dedicated asynchronous serial network
called the Card LAN link.
Sanity timer
The Lineside T1 card also contains a sanity timer that resets the microcontroller in the event
of a loss of program control. The microcontroller must service the sanity timer every 1.2
seconds. If the timer is not properly serviced, it times out and causes the microcontroller to be
hardware reset.
Man-Machine Interface
The Lineside T1 card provides an optional Man-Machine Interface (MMI) that is primarily used
for T1 link performance monitoring and problem diagnosis. The MMI provides alarm
notification, T1 link performance reporting and fault isolation testing. The interface is accessed
through connections from the I/O panel to a terminal or modem.
The MMI is an optional feature because all T1 configuration settings are performed through
dip switch settings or preconfigured factory default settings.
The Lineside T1 card provides an optional Man-Machine Interface (MMI) that is primarily used
for T1 link performance monitoring and problem diagnosis. The MMI provides alarm
notification, T1 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 cabling the cards together.
156 Circuit Card Reference
Comments? infodev@avaya.com
July 2011