Electronic Design


Managed Gigabit Ethernet Switch Boasts Six 1000Base-SX Ports
The AT-9006SX/SC managed Gigabit Ethernet switch has six 1000Base-SX ports (SC connectors). Two expansion slots enhance flexibility. Designers can use optional expansion slots to add 10/100TX ports (four per expansion module) or 100FX ports (two to four per expansion module, depending on the connector) for up/downlinks, additional Gigabit ports (one per expansion module), or a combination of the options. According to its manufacturer, it's well-configured to serve as a backbone switch for small to medium-size business or education environments.

Each of the switch's Gigabit Ethernet ports supports half- or full-duplex operation. Also, each one of these ports is IEEE-802.3z autonegotiating compliant. Running in full-duplex mode, each Gigabit port can provide up to 2000 Mbits/s of aggregate bandwidth. With six 1000Base-SX ports, the AT-9006SX/SC provides an aggregate throughput of over 8.8 million packets/s, or up to 11.8 million packets/s when configured with eight 1000BaseSX ports. The switch supports up to 12,000 MAC addresses, and it has 4 Mbytes of memory per port as well.

Available now, the switch lists at $5385, or $897 per port.

Allied Telesyn International Corp., 19800 North Creek Pkwy., Ste. 200, Bothel, WA 98011; (800) 424-4284; fax (425) 489-9191; www.alliedtelesyn.com.

Chip Set Operates At OC-192 Rates And Exceeds Bellcore Specifications
A 10-Gbit/s chip set—the VSC8173 16:1 multiplexer and the VSC8174 1:16 demultiplexer—targets OC-192 and STM-64 applications. According to its manufacturer, it exceeds all relevant Bellcore and ITU-T jitter specifications. Both chips operate at the standard OC-192 rate of 9.953 Gbits/s and at higher data rates, up to 10.66 Gbits/s, to support forward error correction (FEC) capability.

The VSC8173 integrates a high-speed clock output to reclock data at the laser driver. Its clock output also can be used to verify jitter performance during operation, ensuring SONET compliance. Additionally, this multiplexer features a clock multiplication unit. Its 622-Mbit/s parallel interface fully complies with OIF99.02 requirements, including LVDS levels. This ensures interoperability with other OIF-compliant components.

Meanwhile, the VSC8174 incorporates the clock and data-recovery functions. Its 50-mV sensitivity decreases overall system cost by increasing regenerator spacing by improving low-input signal response. The input data stream's sampling position can be adjusted in voltage and phase, improving system performance. Two 622-MHz clock outputs simplify system design. A loss of signal (LOS) output alarm provides additional flexibility.

These 3.3-V ICs come in 14-mm, 100-pin PQFP or 96-ball BGA packages. Both ICs fully comply with SONET/SDH specifications. Samples are now available. Production is slated for August. The chip set costs $500 in 1000-unit quantities.

Vitesse Semiconductor Corp., 741 Calle Plano, Camarillo, CA 93012; (805) 388-3700; fax (805) 987-5896; www.vitesse.com.

Integrated Downconverter Has High Gain For Front-End Applications
The RF2458, a monolithic integrated downconverter, targets PCS, PHS, and WLAN applications. It contains all of the components that are required to implement the downconverter's RF functions. Also, it includes a double-balanced Gilbert cell mixer and a balanced IF output. Its 14-dBm gain suits it for front-end applications. Frequencies range from 1500 to 2500 MHz, while the power supply ranges from 2.7 to 3.6 V.

According to its manufacturer, the RF2458 can be used in CDMA/TDMA/DCS 1900 PCS systems, PHS 1500/WLAN 2400 systems, and microcell PCS base stations. Offered in an MSOP-10 package, this downconverter is manufactured using an advanced gallium-arsenide process technology (GaAs HBT).

Available immediately, the RF2458 costs $1.15 each in 10,000-unit quantities. Fully assembled evaluation boards are available as well.

RF Micro Devices, 7625 Thorndike Rd., Greensboro, NC 27409-9421; (336) 664-1233; www.rfmd.com.

Processor Guards Against Web Attacks Without Sacrificing Speed
The BCM5805 (UBSEC+) security processor integrates IPSec, IKE, SSL, and TLS processing, public-key acceleration, and random-number generation in a single chip. According to its manufacturer, designers can use this processor to provide strong Internet security without compromising speed and performance. It provides full duplex OC-3 IPSec processing (310 Mbits/s) in excess of 250 Diffie-Hellman key exchanges per second (1024-bit public key, 180-bit private key). An aggressive pre-fetch direct memory access (DMA) engine maximizes throughput under real-world conditions while minimizing the performance degradation on small packets. In typical system applications, it replaces several high-performance processors or multiple serialized cryptographic ASICs.

Currently sampling, the BCM5805 costs $100 in 1000-piece quantities. It comes in a 144-pin LQFP.

Broadcom Corp., 16215 Alton Pkwy., Irvine, CA 92618; (949) 450-8700; fax (949) 450-8710; www.broadcom.com.

Twin-Transistor MESFET Yields 200 MHz Of Instantaneous Bandwidth
The NES2427P-140 twin-transistor gallium-arsenide (GaAs) MESFET can serve as an output power stage in power amplifiers. It delivers 140 W of output power and 200 MHz of instantaneous bandwidth, suiting it for applications from IMT 2000 to WLL. Also, it features a 41% typical power-added efficiency, resulting in low power consumption. A 0.4°C/W thermal resistance produces cooler operation. Additionally, it boasts a 9.5-dB typical linear gain.

Partially matched, this device's two sides can be combined externally in either a balanced or in a push-pull configuration. Its GaAs MESFET chips feature tungsten-silicide gates for high reliability. Silicon-dioxide and nitride passivation yield surface stability. Plated heat sinks reduce thermal resistance.

The NES2427P-140 costs $274 in 100-unit quantities.

California Eastern Laboratories, 4590 Patrick Henry Dr., P.O. Box 54964, Santa Clara, CA 95054-1817; (408) 988-3500; fax (408) 988-0279; www.cel.com.

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