Reference clock selection – Nortel Networks 1000 User Manual

Page 819

Functional description

819

•

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 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.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008