Using Custom-Made Processor Card Or System Cables - Nortel Passport 15000 Preparation Manual

Consider leaving trays empty in sequence to accommodate card slots that will
have filler cards in them. When a processor card is added to the slot, the tray
would be available for the fiber optical cable, if that is the type of card that is
installed. Also, the preferred method of replacing a fiber cable is to route and
connect a parallel cable to another tray, then cut the connectors off the cable
being replaced and leave it installed. Removing a fiber cable from a cluster
can disrupt traffic passing through cables sharing the same path.

Using custom-made processor card or system cables

Since all fiber signaling cables for function processor (FP) cards are your
responsibility to have them measured, cut, and assembled for each installation
and because managing cable slack requires the NTHW50 fiber cable
management unit, the length of the fiber cables varies according to the
location of fiber cards within the shelf and the distance of the shelf from the
next equipment in the port connection paths.
For the electrical FPs (for example, with DS3, E3, or E1 interfaces), Nortel
Networks also offers prefabricated cable assemblies for the traffic (signaling)
ports, and the control ports for sparing panels.
Prefabricated cable assemblies are also provided for the control processors
(CPs). To use an equivalent cable with a different length, you can custom
make your own.
Prefabricated cables are available for the alarm/BITS module that interfaces
with the site's timing (clocking) source.
Prefabricated cable assemblies are not offered by Nortel Networks for fiber
optical FPs.
The position of the coupler on each fiber optical Y-splitter cable is critical for
having effective cable management on a Passport 15000 or 20000. Plan the
length of each installed cable so that its coupler:
• will not reside across the front of the shelf
• will not reside in a drawer of the fiber management unit (NTHW50)
• resides on the side of the NEBS 2000 frame or equivalent mounting
apparatus, or beyond, but not on any of the cable management brackets
Passport 15000, 20000 Site Requirements and Preparation Guide
Chapter 2 Planning considerations 47
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