XRT79L71IB datasheet(65/109 Pages) EXAR

65 / 109 page

XRT79L71

REV. 1.0.0

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

NOTE: The Transmit FEAC Controller block is only active if the XRT79L71 is configured to operate in the DS3, C-bit Parity

Framing format.

The Transmit Trail-Trace Message Controller Block (E3, ITU-T G.832 Applications only)

The Transmit SSM Controller Block (E3, ITU-T G.832 Applications only)

The Transmit DS3/E3 Framer Block

The purpose of the Transmit DS3/E3 Framer block is to accept payload data from the Transmit High-Speed

HDLC Controller block, the Transmit LAPD Controller block and the Transmit FEAC Controller block and to

construct a DS3/E3 data-stream for transmission to the remote terminal equipment. More specifically, in this

particular application, the Transmit DS3/E3 Framer block is responsible for accepting the outbound HDLC

frames and Flag Sequences octets from the Transmit High-Speed HDLC Controller block, and inserting this

data into the payload bits/bytes within the outbound DS3/E3 fames. Additionally, the Transmit DS3/E3 Framer

block can be configured to do all of the following.

• To transmit the AIS Indicator (upon Software Control)

• To automatically transmit the FERF/RDI Indicator (in response to the Receive DS3/E3 Framer block

declaring the LOS, LOF/OOF or AIS defect condition)

• To transmit the FERF/RDI indicator (upon Software Control)

• To automatically transmit the FEBE/REI Indicator (in response to the Receive DS3/E3 Framer block

detecting Frmaing bit or CP-bit errors - DS3, C-bit Parity Applications)

• To automatically transmit the FEBE/REI Indicator (response to the Receive DS3/E3 Framer block detecting

BIP-8 Errors - E3, ITU-T G.832 Applications)

• To transmit the FEBE/REI Indicator (upon Software Control).

The Transmit DS3/E3 LIU Block

The purpose of the Transmit DS3/E3 LIU Block is to accept the outbound DS3/E3 data-stream from the

Transmit DS3/E3 Framer block, and to perform all of the following operations on the signal.

• To encode into the B3ZS Line Code (for DS3 Applications) or the HDB3 Line Code (for E3 Applications)

• To convert this outbound DS3 or E3 data-stream into a DS3/E3 line signal and transmit this signal to the

remote terminal equipment

• To generate and transmit DS3 pulses that complies with the Isolated Pulse Template requirements per

Bellcore GR-499-CORE

• To generate and transmit E3 pulse that complies with the ITU-T G.703 Pulse Template requirements for E3

applications.

The Receive DS3/E3 LIU Block

The purpose of the Receive DS3/E3 LIU Block is to receive a DS3/E3 line signal from the remote terminal

equipment, and to perform the following operations on this incoming line signal.

• To decode this incoming signal from the B3ZS Line Code (for DS3 Applications) or from the HDB3 Line Code

(for E3 Applications) into a binary data-stream

• To route this binary data-stream to the Receive DS3/E3 Framer block for further processing.

• To insure that the XRT79L71 meets all of the following Receive requirements.

a. The Receive Sensitivity requirement for DS3 Applications (e.g., able to receive a DSX-3 type of signal

through at least 450 feet of cable loss).

b. The Receive Sensitivity requirement for E3 Applications (e.g., able to receive an E3 signal over 12dB of

cable loss).

XRT79L71IB Datasheet(PDF) 65 Page - Exar Corporation

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