GENERAL DESCRIPTION

The DS21Q58 E1 quad transceiver contains all the necessary functions for connecting to four E1 lines. The DS21Q58 is a direct replacement for the DS21Q50, with the addition of signaling access and improved interrupt handling. It is composed of a line interface unit (LIU), framer, and a TDM backplane interface, and is controlled through an 8-bit parallel port configured for Intel or Motorola bus operations or serial port operation.

FEATURES

Four Complete E1 (CEPT) PCM-30/ISDN-PRI Transceivers

Pin Compatible with the DS21Q50 and DS21Q59

Short-Haul Line Interfaces

32-Bit or 128-Bit Crystal-Less Jitter Attenuator

Frames to FAS, CAS, and CRC4 Formats

CAS/CCS Signaling Support

4MHz/8MHz/16MHz Clock Synthesizer

Flexible System Clock with Automatic Source  Switching on Loss-of-Clock Source

Two-Frame Elastic-Store Slip Buffer on the Receive Side

Interleaving PCM Bus Operation Up to 16.384MHz

Configurable Parallel and Serial Port Operation

Detects and Generates Remote and AIS Alarms

Fully Independent Transmit and Receive Functionality

Four Separate Loopback Functions

PRBS Generation/Detection/Error Counting

3.3V Low-Power CMOS

Large Counters for Bipolar and Code Violations, CRC4 Codeword Errors, FAS Word Errors, and E Bits

Eight Additional User-Configurable Output Pins

100-Pin (14mm x 14mm) LQFP Package

APPLICATIONS

DSLAMs

Routers

IMA and WAN Equipment