Managing Low-Density Cabling - Nortel Passport 15000 Preparation Manual

42 Chapter 2 Planning considerations

Managing low-density cabling

241-1501-205 5.2S2
2 Calculate the capacity of the cable management bracket. In a packed
scenario, using a single cable bracket (P0937935), the first compartment
holds 87 fibers, the second 64 fibers, and the third 40 fibers for a total of
187 fibers. In an unpacked scenario, the first compartment holds 77
fibers, the second 56, and the third 35 for a total of 168 fibers.
Based on this calculation, a single cable bracket (P0937935) will handle the
fibers from only one-half of a shelf (a cage) containing NTHW21 cards.
To determine the capacity required for NTHW31:
1 Calculate the number of fibers. In this example uses 32 LC fibers per
card. Eight cards are in the lower half of the shelf containing 256 fibers
and 6 cards are in the upper half of the shelf containing 192 fibers.
Therefore the total number or 448 fibers will need to be installed.
2 Calculate the capacity of the cable management bracket. In a single cable
bracket (P0937935) the first compartment holds 170 fibers, the second
compartment holds 120 fibers, and the third 80 fibers for a total of 370
fibers.
Based on this calculation, a single cable bracket (P0937935) will handle the
fibers from only one-half of a shelf containing NTHW31 cards.
To plan cable management for Passport 15000 and Passport 20000 switches
with low-density cabling, do the following:
• review background information on managing telecom cables in
241-1501-200 Passport 15000, 20000 Hardware Description
• review cable and connection specifications for the types of cables you are
planning to install. Cable specifications are listed in 241-1501-200
Passport 15000, 20000 Hardware Description
• review basic cable handing guidelines listed in the best practices section
of 241-1501-240 Passport 15000, 20000 Hardware Installation,
Maintenance and Upgrade
• ensure that the installer is familiar with the task flows and procedures for
routing cables listed in 241-1501-240 Passport 15000, 20000 Hardware
Installation, Maintenance and Upgrade