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; 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 E1 specifications including CCITT/ITU G.704, G.706, G.962, and I.431 as well as ETS 300 011 and ETS 300 233.
Key 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 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)
Easy access to Si and Sa bits
Extracts and inserts CAS signaling
Large counters for bipolar and code violations, CRC4 code word errors, FAS word errors, and E-bits
Programmable output clocks for Fractional E1, per channel loopback, H0 and H12 applications
Integral HDLC controller with 64-byte buffers configurable for Sa bits or DS0 operation
Detects and generates AIS, remote alarm, and remote multiframe alarms
Pin compatible with DS21Q42 enhanced quad T1 framer
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