Nortel Passport 15000, Hardware Installation And Maintenance, Page: 346 / 874

346 Chapter 17 Hardware procedures
241-1501-240 5.2S2
3 Compare the transmit laser range (launch power budget) and the receive
sensitivity range (overload sensitivity) of each card in the pair. For any
Passport FP
• the type of FP is labelled on the faceplate
• the specifications are listed in the characteristics tables for each type
of FP in 241-1501-200
Passport 15000, 20000 Hardware Description
For any non-Nortel Networks optical card, refer to its documentation.
4 Determine the combined signal loss caused by the anticipated length of
each fiber cable, its end connectors and receptacles, and any fiber-to-
fiber connectors in a patch panel that lies between the optical cards.
5 Calculate the difference between each transmit and receive direction for
all connections to and from the FP.
6 Use the difference and the loss to determine the amount of signal
reduction an attenuator must do for each cable. Ensure that each
connection has enough transmit power to overcome the path attenuation
from fiber, connectors, splices, and whatever else affects the signal, or
has enough path attenuation to avoid receiving an overload.
7 If an attenuator is required, determine a location for it to be installed.
Consider whether they will fit behind the cable channel cover, on a frame
upright, or on a cable management bracket. Record the planned location.
8 Obtain any required attenuators before the FPs are cabled.