Quad T1/E1/J1 Transceivers

 

Part Number	Replacement	Explanation

Description

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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.

DS21455: Block Diagram Enlarge+

Key Features

Four Independent Transceivers, Each Having the Following Features:

• 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

Applications/Uses

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