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Cisco Metro 1500 Series Hardware Installation Guide
78-10588-03
Chapter 1 Product Overview
System Modules
All TDM4Es can be replaced or added at any time during operation of the system.
Setting up a communication link requires a pair of fully identical TDM4Es. Up to
four channels of optical communication of the TDM4E are converted to separate
wavelengths of the ITU-T grid for DWDM.
The multiplexer module (MUX) combines the optical signals into a combined
signal for transportation using one single-mode fiber to the optional remote switch
module (RSM). The RSM enhances the system with a 1 + 1 line protection. The
demultiplexer module (DMX) receives the combined signal from the optional
RSM. In the DMX, the combined optical signal is separated into the original
wavelengths of optical communication. These signals are then transferred to the
TDM4Es for reconversion into the application signal. (See Figure 1-15.) The
TDM4Es support the 200 Mbit/s clock rate used by the ESCON protocol.