Nortel Networks 1000 - Manual (Page 818)

818 NTAK20 Clock Controller daughterboard
If the command "free run" is given, the clock controller enters the free-run
mode and remains there until a new command is received. Note that the
free-run mode of operation automatically initiates after the clock controller
has been enabled.
In the temporary absence of a synchronization reference signal, or when
sudden changes occur on the incoming reference due to error bursts, the
clock controller provides a stable holdover. Free-run mode is initiated
when the clock controller has no record of the quality of the incoming
reference clock.
If the command "free run" is given, the clock controller enters the free-run
mode and remains there until a new command is received. Free-run
automatically initiates after the clock controller has been enabled.
CPU-MUX bus interface
A parallel I/O port on the clock controller provides a communication
channel between the clock controller and the CPU.
A parallel I/O port on the clock controller. provides a communication
channel between the clock controller and the CPU.
A parallel I/O port on the clock controller provides a communication
channel between the clock controller and the CPU.
Signal conditioning
Drivers and buffers are provided for all outgoing and incoming lines.
Drivers and buffers are provided for all outgoing and incoming lines.
Drivers and buffers are provided for all outgoing and incoming lines.
Sanity timer
The sanity timer resets the microprocessor in the event of system hang-up.
sanity timer resets the microprocessor in the event of system hang-up.
The sanity timer resets the microprocessor in the event of system hang-up.
Microprocessor
The microprocessor does the following:
• communicates with software
•
monitors two references
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.