Issue 3 June 2000
5-1
5
Transmission and 
Synchronization 
5
Overview 
5
This chapter describes the transmission and synchronization interfaces for the 
DDM-2000 FiberReach Multiplexer. 
Transmission Interfaces 
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DS1 Transmission Interface 
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The DDM-2000 FiberReach wideband shelf supports DS1 interfaces. The DS1 
interface accepts any DSX-1 compatible signal (clear channel interfaces). 
OC-1/OC-3/OC-12 Transmission Interface 
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The DDM-2000 FiberReach wideband shelf supports an OC-1/OC-3/OC-12 
interface. The OC-1 interface is a 51.84 mb/s SONET interface. For OC-3/OC-12 
interface standards, refer to Chapter 10, “Technical Specifications” of 363-206-
285, 
DDM-2000 OC-3 Multiplexer Release 13.0 and Later User/Service Manual - 
Volume I
.