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Enhanced Quad T1 Framer

Product Details

Key Features

Simplified Block Diagram

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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

Applications/Uses

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.

Simplified Block Diagram

DS21Q42: Functional Diagram DS21Q42: Functional Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.