DS21Q44 - Dallas Semiconducotr

DS21Q44 Enhanced QUAD E1 FRAMER

The DS21Q44 E1 is an enhanced version of the DS21Q43 Quad E1 Framer. The DS21Q44 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 DS21Q44 are totally independent, t.

Features

Four E1 (CEPT or PCM-30) /ISDN-PRI framing transceivers All four framers are fully independent; transmit and receive sections of each framer are fully independent Frames to FAS, CAS, CCS, and CRC4 formats Each of the four framers contain dual two
  – frame elastic store slip buffers that can connect to asynchronous backplanes up to 8.192 MHz 8
  –bit parallel control port that can be used directly on either multiplexed or non
  – multiplexed buses (Intel or Motorola) Easy access to Si and Sa bits Extracts and inserts CAS signaling Large counters for bipolar and code violations, CRC4 code word errors, F.