GENERAL DESCRIPTION

The XRT84L38 is an eight-channel 1.544 Mbit/s or 2.048 Mbit/s DS1/E1/J1 framing controller. The XRT84L38 contains an integrated DS1/E1/J1 framer which provides DS1/E1/J1 framing and error accumulation in accordance with ANSI/ITU_T specifications. Each framer has its own framing synchronizer and transmit-receive slip buffers, and can be independently enabled or disabled as required and can be configured to frame to the common DS1/E1/J1 signal formats.

FEATURES

• Eight independent, full duplex DS1 Tx and Rx Framers

• Two 512-bit (two-frame) elastic store, PCM frame slip buffers (FIFO) on TX and Rx provide up to 8.192 MHz asynchronous back plane connections with jitter and wander attenuation

• Supports input PCM and signaling data at 1.544, 2.048, 4.096 and 8.192 Mbits. Also supports 4-channel multiplexed 12.352/16.384 (HMVIP/H.100) Mbit/s on the back plane bus

• Programmable output clocks for Fractional T1/E1/J1

• Supports Channel Associated Signaling (CAS)

• Supports Common Channel Signalling (CCS)

• Supports ISDN Primary Rate Interface (ISDN PRI) signaling

• Extracts and inserts robbed bit signaling (RBS)

• 3 independent HDLC Controllers for Receive and Transmit on a per channel basis

• Each HDLC controller contains two 96-BYTE buffers

• Timeslot assignable HDLC

• V5.1 and V5.2 Interface

• 8-bit Intel/Motorola μP and MIPS Power PC interfaces for configuration, control and status monitoring

• Parallel search algorithm for fast frame synchronization

• Wide choice of T1 framing structures: D4, ESF, SLC®96, TIDM and N-Frame (non-framing)

• Direct access to D and E channels for fast transmission of data link information

• PRBS and QRSS generation and detection

• Programmable Interrupt output pin

• Supports programmed I/O, Burst and DMA modes of Read-Write access

• Each framer block encodes and decodes the T1/E1/J1 Frame serial data into and from the Single-rail or Dual-rail (B8ZS) format

• Dual or single rail line side digital PCM inputs

• Detects and forces Red (SAI), Yellow (RAI) and Blue (AIS) Alarms

• Detects OOF, LOF, LOS errors and COFA conditions

• Loopbacks: Local (LLB) and Line remote (LB)

• Facilitates Inverse Multiplexing for ATM

• Performance monitor with one second polling

• Boundary scan (IEEE 1149.1) JTAG test port

• Accepts external 8kHz Sync reference

• 3.3V CMOS operation with 5V tolerant inputs

• 388-pin BGA package with –40°C to +85°C operation

• Direct Interface to Exar’s XRT83L38 (Octal) LIU

APPLICATIONS

• High-Density T1/E1/J1 interfaces for Multiplexers, Switches, LAN Routers and Digital Modems

• SONET/SDH terminal or Add/Drop multiplexers (ADMs)

• T1/E1/J1 add/drop multiplexers (MUX)

• Channel Service Units (CSUs): T1/E1/J1 and Fractional T1/E1/J1

• Digital Access Cross-connect System (DACs)

• Digital Cross-connect Systems (DCS)

• Frame Relay Switches and Access Devices (FRADS)

• ISDN Primary Rate Interfaces (PRA)

• PBXs and PCM channel bank

• T3 channelized access concentrators and M13 MUX

• Wireless base stations

• ATM equipment with integrated DS1 interfaces

• Multichannel DS1 Test Equipment

• T1/E1/J1 Performance Monitoring

• Voice over packet gateways

• Routers