Cisco Model GS7000 4-Port Node 1 GHz with 42 54 Split Data Sheet
Data Sheet
© 2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information.
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Cisco GS7000 Dispersion Compensation Module
In digital transport systems, dispersion is a fiber property that causes light pulses to
spread.
Dispersion limits both the link’s bit-rate and the maximum transmission distance
that can be achieved through fiber. The Cisco GS7000 Dispersion Compensation Module
(DCM) contains custom-designed passive fiber optics designed to reverse the effects of
dispersion in order to correct the transmitted pulse shape.
An analogous effect occurs in analog transport systems. Here, dispersion also limits the maximum
transmission distance by increasing the magnitude of second order impairments (CSO) to the
signal. The Cisco DCMs are designed to reverse the effects of dispersion, reduce the magnitude of
the CSO impairment, and restore the ability to transmit over greater distances.
The Cisco GS7000 DCMs are designed to fit into the GS7000 extended fiber tray and are available
in a variety of set-ups to accommodate different system needs.
Features
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Provides optimized dispersion compensation across the 1530 nm to 1565 nm wavelength
range
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Designed for Analog and Digital transport systems including DWDM, long-haul, and high bit-
rate applications
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Fully passive
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SC/APC connectors
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With GS7000 extended fiber tray mounted
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With Telcordia GR-2854-CORE Compliant Dispersion Compensation Fiber
Figure 1. Cisco Dispersion Compensation Module