This document contains information on a product under development. The parametric information contains target parameters that are subject to change.

The is a fully integrated quad line interface unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications. It is designed to complement T1/E1 framers or operate as a stand-alone line interface to synchronous or plesiochronous mappers and multiplexers. The device can be controlled through a host mode serial port or by hardware mode operation, where device control and status are obtained through non-multiplexed dedicated pins. Many of these pins are also dedicated to individual channels for maximum flexibility and for use in redundant systems. Integrated in the CN8380 device is a clock rate adapter (CLAD), which provides various low-jitter programmable system clock outputs. The receive section of the CN8380 is designed to recover encoded signals from lines having dB of attenuation. The transmit section consists of a programmable, precision pulse shaper.

Four T1/E1 short haul line interfaces in a single chip On-chip CLAD /system synchronizer Digital (crystal-less) jitter attenuators selectable for transmitter/receiver on each line interface Meets AT&T pub 62411 jitter specs Meets ITU G.703, ETS 300 011 (PSTNX) Connections AMI/B8ZS/HDB3 line codes Host serial port or hardware only control modes On-chip receive clock recovery Common transformers for 120/75 E1 and 100 T1 Low-power 3.3 V power supply Transmitter performance monitor Compatible with latest ANSI, ITU-T, and ETSI standards 128-pin MQFP package Remote and local loopbacks

SONET/SDH multiplexers T3 and E3/E4 (PDH) multiplexers ATM multiplexers Voice compression and voice processing equipment WAN routers and bridges Digital loop carrier terminals (DLC) HDSL terminal units Remote concentrators Central office equipment PBXs and rural switches PCM/voice channel banks Digital access and cross-connect systems (DACS)

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Interface Compatibility or 2.048 Mbps ITU-T Recommendation I.431 Line Codes Bipolar alternate mark inversion line coding Optional zero code suppression: � Independent transmit and receive E1: HDB3 Loopbacks Remote loopback towards line � With or without JAT � Retains BPV transparency Local loopback towards system � Analog line loopback � Local digital loopback Simultaneous local and remote line loopbacks Programmable input timing reference: � Receive recovered clock from any channel � Internal clock (REFCKI) � CLADI Subrate CLADI timing reference: � Line rate 7 � References as low as 8 kHz

Receive Line Interface External Termination Equalizer compensation for 20 dB bridged monitor levels �12 dB receiver sensitivity

Host Serial Interface Compatible with existing framers Compatible with microprocessor serial ports Bit rates to 8 Mbps

Transmit Line Interface Pulse shapes for 0�655 ft., in 133 ft. steps (T1 DSX�1) External termination for improved return loss Line driver enable/disable for protection switching Output short circuit protection (for BABT applications) Jitter Attenuator Elastic Store Receive or transmit direction or 128-bit depth Automatic and manual centering

In-Service Performance Monitoring Transmit alarm detectors: � Loss of Transmit Clock (TLOC) � Transmit Short Circuit (TSHORT) Receive alarm detectors: � Loss of Signal (RLOS) � Loss of Analog Input (RALOS) � Bipolar/Line Code Violations Automatic and on-demand transmit alarms: � AIS following TLOC � Automatic AIS clock switching

Clock Rate Adapter Outputs jitter attenuated line rate clock k (E1) CLAD output supports 14 output clock frequencies: 8 kHz to 32,768 kHz