DESCRIPTION
The 78P2253 is a transceiver IC designed for 139.264Mbit/s (E4) or 155.52Mbit/s (OC-3, STS-3 or STM-1) transmission. It is used at the interface to a 75W coaxial cable using CMI coding or a fiber optic module. Interface to digital framer circuits is accomplished via a serial PECL or parallel CMOS interface.

FEATURES
• 139.264Mbit/s or 155.52Mbit/s interface for
   CMI coded transmission using 75W coaxial
   cable
• Compliant with ITU-T G.703, G.823 jitter
   tolerance, Telcordia TR-NWT-00253
• Integrated Clock Recovery Unit (CRU)
• Serial PECL Interface
• Four and Eight bit Parallel CMOS Interfaces
• PECL Interfaces for connection to Fiber
   Optic Modules for SONET OC3 applications
• Adaptive Equalization
• Integrated Clock Multiplier PLL
• Advanced BiCMOS Process