Nortel Networks Circuit Card 311 - Manual (Page 919)

Functional description 919
• minimizes the propagation of impairments on the system clock due to
errors on the primary or secondary reference clocks
The microprocessor does the following:
• communicates with software
• monitors 2 references
• provides a self-test during initialization
• minimizes the propagation of impairments on the system clock due to
errors on the primary or secondary reference clocks
The microprocessor does the following:
• communicates with software
• monitors two references
• provides a self-test during initialization
• minimizes the propagation of impairments on the system clock due to
errors on the primary or secondary reference clocks
Reference Clock Selection
The DTI/PRI card routes its reference to the appropriate line on the
backplane. The clock controller distributes the primary and secondary
references and ensures that no contention is present on the REFCLK1
backplane line. It designates the DTI/PRI motherboard as a primary
reference source. The secondary reference is obtained from another
DTI/PRI card, which is designated by a technician. No other clock sources
are used.
The DTI/PRI card routes its reference to the appropriate line on the
backplane. The clock controller distributes the primary and secondary
references and ensures that no contention is present on the REFCLK1
backplane line. It designates the DTI/PRI mother board as a primary
reference source. The secondary reference is obtained from another
DTI/PRI card, which is designated by a craft person. No other clock sources
are used.
The DTI/PRI card routes its reference to the appropriate line on the
backplane. The clock controller distributes the primary and secondary
references and ensures that no contention is present on the REFCLK1
backplane line. It designates the DTI/PRI motherboard as a primary
reference source. The secondary reference is obtained from another
DTI/PRI card, which is designated by a technician. No other clock sources
are used.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.