In order to reduce design complexity for original equipment manufacturers (OEMs), Exar Corporation is now offering a T1/E1/J1 framer and LIU combination with next generation capabilities and features. The single-channel XRT86VL30 targets telecommunications equipment that includes wireless base stations, digital access and cross connect systems, Channel Service Units (CSUs) and voice over packet gateways, among others.
The XRT86VL30 is a single-channel physical-layer processor that incorporates a T1/E1 (1.544 Mb/s or 2.048 Mb/s) framer and a LIU. Each framer has both a framing synchronizer and transmit and receive slip buffers. Permitting data line terminal equipment direct access to the out-bound T1/E1/J1 frames, each framer also contains transmit and overhead data input ports. It has complementary blocks to the transmit path in the receive direction. Also, the XRT86VL30 includes a PRBS, QRSS and network loop up/down code generator/detector.
The XRT86VL30 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 (
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Alert) 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, JTG.704, JT G706, I.431. it also provides extensive test and diagnostic functions such as 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.
The XRT86VL30 supports Exar's R3 Technology. Devices using R3 Technology support all common T1/E1/J1 line impedances and are reconfigurable with integrated termination. This allows the customers to eliminate the need for external relays for 1:1 and 1+1 redundancy applications by building a simple board. This feature allows final device configuration to be made just prior to line-card installation. With this, customers do not have to unnecessarily stockpile an inventory of all configurations to accommodate changing market conditions.
“Customers who have come to trust the reliable performance and ease-of- design with our earlier eight-channel, four-channel, and dual-channel T1/E1/J1 framer/LIUs sought a single-channel next generation option for their platforms," said Tim Halladay, applications manager for the communications product line.
Halladay continued: "With simultaneous loop code detection for diagnostics, Exar's R3 Technology (TM) (Reconfigurable, Relayless Redundancy), simultaneous processing of up to three HDLC messages, BITS Clock Compliance with Section 13 in G.703, and a fully automated SSM BOC controller, the XRT86VL30 is ideal for operations and management applications where this high level of performance has become an industry standard.”
Raju Shanbhag is a contributing editor for TMCnet. To read more of Raju’s articles, please visit his columnist page.