ATLANTA -- Chip makers Vitesse Semiconductor Corp. and Applied Micro Circuits Corp. used this week's Supercomm trade show here to launch various products aimed at optical networking. Infineon Technologies AG, meanwhile, chimed in with some new copper-networking chips and a signaling controller.
Vitesse of Camarillo, Calif., launched two new Sonet chips, the fruits of its acquisition of design house Vermont Scientific Technologies (VTek) in November 1998. The products are the first in the newly created TimeStream family of optical networking parts.
The VSC9184 is a 2.5 Gbit/s pointer processor for Sonet and SDH. The part sits behind a demultiplexer to align and adjust the splintered streams that are divided from incoming OC-48 (2.5 Gbit/s) traffic. Four of these chips can be used to handle an OC-192 stream, when used in conjunction with a interleaver/deinterleaver part.
Vitesse's second part, the VSC9182, is a 768x768 switch for handling 16 OC-48 streams, or 40 Gbit/second aggregate throughput. The devices can operate as a 1,024 x 1,024 switch by arranging multiple VSC9182s in a three-staged setup known as a Clos architecture.
Used in conjunction with the VSC9184, however, the VSC9182s can form a slim 64 x 64 OC-48 switch. This can be done with only four of the VSC9184s, because the grooming done by the VSC9182s can be used to replace the outermost stages of the Clos architecture, said Andrew Schmitt, manager of telecom products marketing for Vitesse.
This kind of arrangement would be targeted at compact, medium-density switches for the metropolitan network. "In the metro application, you don't need 1,000 ports, but 16 might not be enough," Schmitt said. "People don't react like 64 ports is a whole lot, but we can fit them into a very slim architecture."The two Vitesse chips are due to begin sampling this month with production quantities slated for August.
AMCC of San Diego used Supercomm to announce two 2.5 Gbit/s parts: a quad VCSEL array and a transimpedance amplifier. The S7022 array combines four vertical-cavity surface-emitting lasers (VCSELs) into a CMOS package. Most notable about the part is its ability to counter the "spread" of the lasers, as the inexpensively built VCSELs vary slightly in performance.
"We have digital control of the modulation and the biasing performance of the VCSELs," said John Siann, AMCC director of marketing. By compensating, the S7022 allows all VCSELs to be used, thus automating the manufacturing process. "A single-VCSEL chip is one thing, but to scrap a whole array like this is expensive," Siann said.
b>Getting on "Track"
The S7022 also uses a technology called "VCSEL-Track" to compensate for distortions in the laser's wave form, providing the precision required by Sonet specifications.
AMCC also introduced the companion chip to the S7022. Named the S7025, the part is a silicon germanium transimpedance amplifier for receiving optical data at 2.5 Gbit/s. The part also incorporates a limiting amplifier driver.
Both AMCC chips are sampling now, with volume production scheduled for August. Outside the optical realm, Infineon Technologies AG (San Jose, Calif.) announced three new parts at the show. The company's IWE8 family of devices act as interfaces between ATM networks and T1/E1 lines. Three parts in this family were introduced: one with and one without the SRTS clocking mode for ATM, and a third that omits support for AAL1, the ATM physical layer.
Separately, Infineon announced the PEB3452 line interface unit, also named Puccini, for connecting DS3/STS-1 or E3 transmission lines. Puccini also integrates clock and data recovery, so that the lone chip can sit between the incoming data line and a framer.
Finally, Munich-based Infineon introduced the Serial Optimized Communication Controller, or Serocco, for handling multiple signaling protocols between networking chassis. Aimed primarily at intraoffice links, the Serocco chip handles the HDLC and PPP signaling standards, as well as older protocols such as Async and Bisync.