XRT84L38 Datasheet PDF | Exar Corporation

Exar Corporation XRT84L38

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 Each Framer block contains its own Transmit and Receive T1/E1/J1 Framing function including 3 HDLC controllers to support V5.2.

Part No.	XRT84L38
Datasheet	XRT84L38 Download
Manufacturer	Exar Corporation
Description	OCTAL T1/E1/J1 FRAMER
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GENERAL DESCRIPTION

Each Transmit HDLC controller encapsulates contents of the Transmit HDLC buffers into LAPD Message frames. Each Receive HDLC controller extracts payload content of Receive LAPD Message frames from the incoming T1/E1/J1 data stream and writes it into the Receive HDLC buffer. Each framer also contains a Transmit and Overhead Data Input port, which permits Data Link Terminal Equipment direct access to the outbound T1/E1/J1 frames Likewise, a Receive Overhead output data port permits Data Link Terminal Equipment direct access to the Data Link bits of the inbound T1/E1/J1 frames. The XRT84L38 fully meets all of the latest T1/E1/J1 specifications: ANSI T1/E1.107-1988, ANSI T1/ E1.403-1995, ANSI T1/E1.231-1993, ANSI T1/ E1.408-1990, AT&T TR 62411 (12-90) TR54016, and ITU G-703, G.704, G706 and G.733, AT&T Pub. 43801, and ETS 300 011, 300 233, JT G.703, JT G.704, JT G706, I.431. Extensive test and diagnostic functions include Loop-backs, Boundary scan, Pseudo Random bit seq...