GENERAL DESCRIPTION

The XRT72L71 DS3 ATM User Network Interface (UNI)/Clear-Channel Framer is designed to function as either a DS3 ATM UNI or Clear channel framer. For ATM UNI applications, this device provides the ATM Physical Layer (Physical Medium Dependent and Transmission Convergence sub-layers) interface for both the public and private networks at DS3 rates. For Clear-Channel framer applications, this device supports the transmission and reception of “user data” via the DS3 payload bits.

FEATURES

• Compliant with UTOPIA Level 1 and 2 with 8 or 16 Bit Interface Specification and supports UTOPIA Bus speeds of up to 50 MHz

• Contains on-chip 16 cell FIFO in both the Transmit (TxFIFO) and Receive Directions (RxFIFO)

• Contains on-chip 54 byte Transmit OAM Cell buffer and a 108 byte Receive OAM cell buffer, for transmission, reception and processing of OAM cells.

• Supports PLCP or ATM Direct Mapping modes

• Supports M13 and C-Bit Parity Framing Formats

• Supports DS3 Clear Channel Framing Applications

• Includes PRBS Generator and Receiver

• Supports Local, Remote-Line, Cell, and PLCP Loop-backs

• Interfaces to 8 or 16 Bit wide Motorola and Intel µPs

• Low power 3.3V, 5V input tolerant, CMOS

• 160 pin PQFP Package

• 3 and 4 Channel Version also Available

APPLICATIONS

• Private User Network Interfaces

• ATM Switches

• ATM Concentrators

• DSLAM Equipment

• DS3 Frame Relay Equipment