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FULL DATA SHEET (PDF, 1.4MB) Download   E-Mail The DS21Q55 is a quad software-selectable T1, E1, or J1 MCM device for short-haul and long-haul applications. Each port is composed of a line interface unit (LIU), framer, HDLC controllers, and a TDM backplane interface, and is controlled by an 8-bit parallel port configured for Intel or Motorola bus operations. The DS21Q55 is software compatible with the DS2155 single-chip transceiver. It is pin compatible with the DS21Qx5y family of products.

Key Features		Applications/Uses
Complete T1/DS1/ISDN-PRI/J1 Transceiver Functionality Complete E1 (CEPT) PCM-30/ISDN-PRI Transceiver Functionality Long-Haul and Short-Haul Line Interface for Clock/Data Recovery and Waveshaping CMI Coder/Decoder for Optical I/F Crystal-Less Jitter Attenuator Fully Independent Transmit and Receive Functionality Dual HDLC Controllers Programmable BERT Generator and Detector Internal Software-Selectable Receive and Transmit-Side Termination Resistors for 75Ω /100Ω /120Ω T1 and E1 Interfaces Dual Two-Frame Elastic-Store Slip Buffers that Connect to Asynchronous Backplanes Up to 16.384MHz 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz Clock Output Synthesized to Recovered Network Clock		Channel Banks Channel Service Units (CSUs) Data Service Units (DSUs) DSL Add/Drop Multiplexers Muxes Routers/Switches Routers/Switches T1/E1 Test Equipment

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