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FEATURES

? Integrates a full-featured T1 framer and line interface in a single device with

analog circuitry for receiving and transmitting DSX-1 compatible signals and

digital circuitry for terminating the duplex DS-1 signal.

? Provides an 8-bit microprocessor bus interface for configuration, control, and

status monitoring.

? Low power CMOS technology

? Available in either a 68 pin PLCC package, or a high density (14 by 14mm) 80

pin PQFP package.

The receiver section:

? Provides analog circuitry for receiving a DSX-1 signal up to 655 feet from the

cross-connect. Direct digital inputs are also provided to allow for by-passing

the analog front-end.

? Recovers clock and data using a digital phase locked loop for high jitter

tolerance. A direct clock input is provided to allow clock recovery to be bypassed.

? Accepts dual rail or single rail digital PCM inputs.

? Supports B8ZS or AMI line code.

? Accepts gapped data streams to support higher rate demultiplexing.

? Frames to SF, ESF, T1DM (DDS), and SLC?96 format DS1 signals.

? Provides loss of signal detection, and red, yellow, and AIS alarm detection.

Red, yellow, and AIS alarms are integrated as per industry specifications.

? Detects violations of the ANSI T1.403 12.5 pulse density rule over a moving

192 bit window.

? Provides programmable in-band loopback code detection.

? Supports line and path performance monitoring according to AT&T and ANSI

specifications. Accumulators are provided for counting:

? ESF CRC-6 errors to 333 per second;

? Framing bit errors to 31 per second;

? Line code violations to 4095 per second; and

? Loss of frame or change of frame alignment events to 7 per

second.

? Provides ESF bit-oriented code detection, and an HDLC/LAPD interface for

terminating the ESF data link.

? Supports polled, interrupt-driven, or DMA servicing of the HDLC interface.

? Extracts the data link in ESF, T1DM (DDS) or SLC?96 modes. Extracts the Dchannel for Primary Rate interfaces.

? Provides a two-frame elastic store buffer for jitter and wander attenuation that

performs controlled slips and indicates slip occurrence and direction.

? Provides robbed bit signalling extraction, with optional data inversion,

programmable idle code substitution, digital milliwatt code substitution, bit

fixing, and 2 superframes of signalling debounce on a per-channel basis.

? Provides trunk conditioning which forces programmable trouble code

substitution and signalling conditioning on all channels or on selected

channels.

? Optionally provides dual rail digital PCM output signals to allow BPV

transparency. Also supports unframed mode.

? Supports transfer of received PCM and signalling data to 1.544 Mbit/s

backplane buses or to 2.048 Mbit/s backplane buses.

APPLICATIONS

? T1 Channel Service Units (CSU) and Data Service Units (DSU)

? T1 Channel Banks (CH BANK) and Multiplexers (CPE MUX)

? Digital Private Branch Exchanges (DPBX)

? Digital Access and Cross-Connect Systems (DACS) and Electronic DSX Cross-Connect Systems (EDSX)

? T1 Frame Relay Interfaces

? T1 ATM Interfaces

? ISDN Primary Rate Interfaces (PRI)

? SONET Add/Drop Multiplexers (ADM)

? Test Equipment