Card lan interface, Sanity timer – Nortel Networks 1000 User Manual

Page 175

Functional description

175

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control of the T1 line interface

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enabling/disabling of individual units or entire card

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programming of loop interface control circuits for administration of
channel operation

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maintenance diagnostics

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interface with the line card circuit:

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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.

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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.

Maintenance data is exchanged with the Common Equipment CPU over a
dedicated asynchronous serial network called the Card LAN link. The Card
LAN link is described in

“Card LAN link” (page 25)

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.

The Lineside T1 card 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.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008