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70-km Gigabit Ethernet GBIC Transceiver Installation Guide

Calculating the Link

Budget for the 70-km

GBIC Transceiver

Incorrect Value in the Ethernet Display Field (CoreBuilder 3500)

An incorrect value appears in the Ethernet display field when all of these

conditions are true:

Your CoreBuilder 3500 is running system software at Release 2.1 or

earlier.

You have installed or reinstalled a new or replacement GBIC (for

example, Model Number 3CGBIC91, 3CGBIC92 or 3CGBIC97).

You enter the

ethernet summary

for the first time.

When all of these conditions are true, the text

appears in the

portType

GBIC is qualified and functions properly. Disregard this incorrect value.

The 70-km GBIC has an optical budget of 20 dB and operates at a

wavelength of 1550 nm. Calculate potential link distances as follows:

Minimum launch power is –4 dBm.

Minimum receive sensitivity is –24 dBm.

The optical budget is arrived at by subtracting the minimum receive

sensitivity of –24 dBm from the minimum launch power of –4 dBm,

which yields an optical budget of 20 dB.

Allow 0.25 dB attenuation per kilometer of single-mode fiber at

1550 nm.

Allow 0.5 dB attenuation per mating connector.

or the

ethernet detail

field of the Ethernet display even though the

command

(GBIC) Non-qualified