Kits Of Spare Parts For A Passport 15000 Or 20000; Assess Timing Requirements - Nortel Passport 15000 Preparation Manual

Kits of spare parts for a Passport 15000 or 20000

Assess timing requirements

Hardware kits are available to provide sets of spare parts for a Passport 15000
or 20000. For a Passport 15000, the kits are:
• NTQS29AA
• NTQS29AB
For a Passport 20000, the kits are:
• NTQH29AA
• NTQH29AB
• NTQH29AC
• NTQH29AD
The parts of each kit are listed in the chapter on field replaceable units (FRUs)
in 241-1501-200 Passport 15000, 20000 Hardware Description.
Timing and synchronization are necessary to ensure that any network element
that derives timing from the Passport 15000 or 20000 ports is part of the
synchronization hierarchy. This is especially important for any circuit
emulation applications and SONET-based networks that derive their timing
information from a high quality network clock.
A Passport 15000 or 20000 can receive a clock signal from:
• a non-traffic carrying link to the building (BITS)
• a traffic-carrying signal originating from another node that supports line
timing
• the free-running internal oscillator (stratum 3) of a CP card
Note: Use only one type of timing mode, that is, BITS or line timing, not
a combination. Mixing timing modes can interfere with sustaining timing
while a module that is directly associated with timing undergoes a
maintenance activity.
Passport 15000, 20000 Site Requirements and Preparation Guide
Chapter 2 Planning considerations 85
5.2S2