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XRT86SH328 Datasheet(PDF) 1 Page - Exar Corporation |
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XRT86SH328 Datasheet(HTML) 1 Page - Exar Corporation |
1 / 129 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XRT86SH328 VOYAGER - E1 FRAMER + LIU REGISTER DESCRIPTION AUGUST 2008 REV. 1.0.1 GENERAL DESCRIPTION The XRT86SH328 has a total of 42 independent E1 framers (or 56 independent framers for T1). This Voyager Device maps 21 E1 payloads up to STS-3/ STM-1. The purpose of the 42 framers is to allow back-to-back transmit and receive framers on each of the 21 channel Egress and Ingress data paths. The channel numbering system references the framers according to the block diagram shown in Figure 1, where every 4TH Channel is not used in E1 mode. The XRT86SH328 provides E1 framing and error accumulation in accordance with ANSI/ITU_T specifications. Each framer has its own framing synchronizer and transmit-receive slip buffers. The slip buffers can be independently enabled or disabled as required and can be configured to frame to the common E1 signal formats. Each Framer block contains its own Transmit and Receive E1 Framing function. There is 1 Transmit HDLC controller per channel which encapsulates contents of the Transmit HDLC buffers into LAPD Message frames. There is 1 Receive HDLC controller per channel which extracts the payload content of Receive LAPD Message frames from the incoming E1 data stream and write the contents into the Receive HDLC buffers. The XRT86SH328 fully meets all of the latest E1 specifications: ANSI E1.107-1988, ANSI E1.403- 1995, ANSI E1.231-1993, ANSI 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 sequence (PRBS) test pattern generation, Performance Monitor, Bit Error Rate (BER) meter, forced error insertion, and LAPD unchannelized data payload processing according to ITU-T standard Q.921. Applications and Features (next page) FIGURE 1. XRT86SH328 21-CHANNEL E1 FRAMERS (42 TOTAL E1 FRAMERS) Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Cross Connect VT Mapper LIU Ch 0 Ch 28 Ch 55 Ch 27 Rx Tx Rx Tx Every 4 th Channel Is Not Used in E1 Mode E1 Framers |
Similar Part No. - XRT86SH328_1 |
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Similar Description - XRT86SH328_1 |
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