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5
Introduction
This section describes how the Nortel Networks* coarse
wavelength division multiplexed Gigabit Interface Converter
(CWDM GBIC) works within the optical routing system. It also
provides a list of CWDM GBICs by wavelength and shows how
they are labeled and color-coded.
CWDM GBIC description
CWDM GBICs are transceivers that link Gigabit Ethernet ports
with fiber optic networks. WDM technology consolidates
multiple optical channels, using specific wavelengths to expand
available bandwidth, on a common optical fiber.
About the optical routing system
CWDM GBICs (Figure 1) are a component in the optical routing
system designed to support high speed data communication for
Metropolitan Area Networks (MANs). The system uses a grid of
eight CWDM optical wavelengths in both ring and point-to-point
configurations. All components are color-coded by wavelength
(Table 1 on page 7). The optical routing system also includes the
following:
• Optical multiplexer-demultiplexer (CWDM OMUX)
• Optical add/drop multiplexer (CWDM OADM)
For more information about the optical routing system, and
connecting CWDM GBICs to CWDM OMUXs and CWDM
OADMs, see Installation and Networking Guidelines for
Optical Routing, part number 212257-A.