SAN JOSE -- Exar Corp. will come to this week's Networld+Interop show in Las Vegas with the XRT73L03, a universal triple-channel transceiver suited for T3 (DS-3 45-Mbit/second), E3 (38-Mbit/s) or STS-1 (51-Mbit/s) applications.
Hugh Wright, tactical marketing director at Exar Corp., said that the XRT73L03 transceiver lets systems manufacturers inventory one part for line cards used worldwide. The three channels on the chip can be programmed independently for access devices that have to support both European and North American line rates.
While integration of multichannel devices often goes from two channels to four, Wright cited a reason for offering a three-channel transceiver. Most leased-line services are aggregated into Sonet OC-3 (155-Mbit/s) fiber backbones, he noted, and three channels of T3 or E3 represent an ideal aggregation level for an OC-3 line.
The 73L03 builds on Exar's popular XRT7300 architecture and uses 3.3-volt interfaces throughout to minimize power dissipation. The transceiver can be programmed in host mode through a standard microprocessor serial interface or in hardwired mode for use in standalone form or with custom-programmed ASICs.
The chip offers a range of local and remote loopback features for detailed diagnostics. It can support error detection and declaration for loss of signal, loss of lock and line code violations. During loss of signal, it can mute any transmissions coming from the transceiver, preventing on-chip alarms from giving incorrect designations on the source of errors, according to Exar.
The device has dedicated pulse-shaping circuitry on-chip to generate compliant transmit-pulse templates. Special transmit-clock duty cycle correction circuitry is also provided on-chip. Exar said it has received its first prototypes of the chip, which are going through conformance testing. General sampling is slated for the middle of the third quarter.
The device is packaged in a 120-pin thin quad flat pack. The price in quantities of 1,000 is $68.78 each.