Quad T1/E1/J1 Transceivers

The DS21455 and DS21458 are quad monolithic devices featuring independent transceivers that can be software configured for T1, E1, or J1 operation. Each is composed of a line interface unit (LIU), framer, HDLC controllers, and a TDM backplane interface, and is controlled via an 8-bit parallel port configured for Intel or Motorola bus operations. The DS21455* is a direct replacement for the older DS21Q55 quad MCM device. The DS21458, in a smaller package (17mm CSBGA) and featuring an improved controller interface, is software compatible with the older DS21Q55.

*The JTAG function on the DS21455/DS21458 is a single controller for all four transceivers, unlike the DS21Q55, which has a JTAG controller-per-transceiver architecture.

Applications

* Channel Banks * Channel Service Units (CSUs) * Data Service Units (DSUs) * Muxes * Routers * Switches * T1/E1 Test Equipment

* Complete T1 (DS1)/ISDN-PRI/J1 Transceiver Functionality

* Complete E1 (CEPT) PCM-30/ISDN-PRI Transceiver Functionality

* Short- and Long-Haul Line Interface for Clock/Data Recovery and Waveshaping

* CMI Coder/Decoder

* Crystal-Less Jitter Attenuator

* Fully Independent Transmit and Receive Functionality

* Dual HDLC Controllers

* On-Chip 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 can Connect to Asynchronous Backplanes Up to 16.384MHz

* 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz Clock Output Synthesized to Recovered Network Clock

* Programmable Output Clocks for Fractional T1, E1, H0, and H12 Applications

* Interleaving PCM Bus Operation

* 8-Bit Parallel Control Port, Multiplexed or Nonmultiplexed, Intel or Motorola

* IEEE 1149.1 JTAG-Boundary Scan

* 3.3V Supply with 5V Tolerant Inputs and Outputs

* DS21455 Directly Replaces DS21Q55

* Signaling System 7 (SS7) Support

* RAI-CI, AIS-CI Support