Cable Assemblies For An Nthw31; Cable Specifications For Custom-Making Lc Cable Assemblies - Nortel Passport 15000 Hardware Description

Cable assemblies for an NTHW31

With an NTHW31 FP, use single-mode (SM) fiber cable with small-form LC
connectors at the FP end.
The sum of cable losses and connector losses from the FP to the far end
termination must not exceed 12 dB for SM cable. The losses in a transmission
path determine the distance the FP can send a signal. The maximum distance
from the FP to the far end is 15 to 20 km for SM cable, depending on the
losses due to splices, repeaters, and connectors.
You must custom make your cable assemblies. Follow the specifications in
"Cable specifications for custom-making an LC cable assembly" (page 276).
Cable specifications for custom-making LC cable assemblies
Make an LC cable assembly using the following specifications. Refer also to
the figure "The LC cable assembly with duplex connectors and duplex
cables" (page 235).
• Use single-mode (SM) fiber with a core diameter of 9 microns and a
cladding diameter of 125 microns.
• Use duplex fiber cables to provide lesser cable volumes and easier cable
management under the hood.
• The outside diameter of one SM cable must not exceed 1.6 mm
(0.0629 inch). The combined outside width of two cables zipped together
to make a duplex cable must not exceed 3.2 mm (0.1259 inch) as shown
in the figure "The LC cable assembly with duplex connectors and duplex
cables" (page 235). The thinner cable allows the fiber hood on the
faceplate to close over the entire cluster of cables without pinching them
and can allow the duplex cable to be ravelled onto the tray of a fiber
management unit (NTHW50).
Note: Ladder rackable cable (especially at 3.0 mm) cannot be used.
• Use duplex small-form LC connectors at the FP end especially since the
Tx and Rx transceivers are opposite on each side of the faceplate, and any
other fiber connector you choose at the next hop from the FP.
Chapter 4 Control and function processors 233
Passport 15000, 20000 Hardware Description 5.2S2