Enhanced Quad T1 Framer

Overview

Status

All versions are No Longer Available.

Description

The DS21Q42 is an enhanced version of the DS21Q41B quad T1 framer. The DS21Q42 contains four framers that are configured and read through a common microprocessor-compatible parallel port. Each framer consists of a receive framer, receive elastic store, transmit formatter, and transmit elastic store. All four framers in the DS21Q42 are totally independent; they do not share a common framing synchronizer. The transmit and receive sides of each framer are also totally independent. The dual two-frame elastic stores contained in each of the four framers can be independently enabled and disabled as required. The device fully meets all of the latest T1 specifications including ANSI T1.403-1995, ANSI T1.231-1993, AT&T TR 62411 (12-90), AT&T TR54016, and ITU G.704 and G.706.

Data Sheet

Download	Rev 1	(PDF, 960kB)
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Key Features

Four T1 DS1/ISDN-PRI/J1 framing transceivers
All four framers are fully independent
Each of the four framers contain dual twoframe elastic-store slip buffers that can connect to asynchronous backplanes up to 8.192MHz
8-bit parallel control port that can be used directly on either multiplexed or nonmultiplexed buses (Intel or Motorola)
Programmable output clocks for Fractional T1
Fully independent transmit and receive functionality
Integral HDLC controller with 64-byte buffers configurable for FDL or DS0 operation
Generates and detects in-band loop codes from 1 to 8 bits in length including CSU loop codes
Pin compatible with DS21Q44 E1 enhanced quad E1 framer
3.3V supply with 5V tolerant I/O; low-power CMOS
Available in 128-pin TQFP package
IEEE 1149.1 support

Diagram

Functional Diagram

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Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 1; 2002-06-26
This page last modified: 2009-10-22