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Trimble Autonomy has introduced the Trimble BD9250, a dual-frequency OEM GNSS receiver module that supports Trimble RTX correction services. The receiver is designed to deliver high-accuracy positioning for a range [...]

Two British technologists backed by the U.K. Ministry of Defense have filed patents on the future interoperable GPS and Galileo signal designs that severely disrupt modernization plans for both systems [...]

The trends pertaining to the innovative design, development, and production of communications equipment in Asia are discussed.

The usage of complementary split ring resonators during the manufacture of microstrip band-stop filters is described.

The usefulness of ferrite junction components, for the control of radio signals during the processing of signals in communications equipment, is described.

The development of a helical resonator-based filter, to be used for the design of telecommunications equipment, is described.

The design of a 2.4 GHz Bluetooth transceiver RFIC in CMOS requires careful verification of key performance criteria at all stages of the design process. This can be accomplished by [...]

Most modern wired and wireless communication systems require sophisticated frequency conversion to and from baseband. Quadrature, or I/Q, modulation is used frequently to upconvert data to an IF in the [...]

Power outages pose grave problems to the telecommunications industry. Integrated circuits employed in computerized electronics are especially sensitive to power disturbances. To safeguard these circuits, telephone companies should use silicon avalanche suppression diodes. These diodes provide lower and more precise voltage protection levels. Investment in such technology could mean bigger savings to most telephone companies.

Switched Multimegabit Data Service (SMDS) has been available for one year, and the implementation of SMDS service by local exchange carriers (LECs) can be considered a success. SMDS has not been rolled-out in 35 states, and in the second half of 1993, SMDS should be deployed in an additional 15-20 areas. The LECs are positioning SMDS by offering networking and fast-packet services and currently are investigating the use of SMDS in multi-services networking environments., SMDS is being positioned as a standalone offering and as part of the LECs' portfolio of broadband services. Last year at this time, SMDS was emerging from the labs and [...]

The transition of data between a conductor-backed coplanar finite ground waveguide and a microstrip line, at different frequencies, is described.

While not directly addressing the causes of dispersion losses, FEC can provide a cost-effective solution to the problems dispersion creates in 10-Gbit/sec metro transponders. Current MANs typically comprise OC-12 and [...]

Power amplifiers are critical radio frequency components of wireless network systems, typically representing 10 to 40 percent of the cost of a basestation. There are a variety of wireless standards [...]

Modernization of wire center infrastructure is essential for efficiency, reliability and safety. Old central offices are built for applications that have been replaced by fiber optics and digital distribution systems which require different building specifications. New cabling strategies, flexible interface frames and cable pathway designs are needed to optimize the technological growth of the system. Additional areas for modernization involve the voice frequency network, power and grounding distribution, maintenance networks, equipment and cable access, facility protection and records update and mechanization.

'Fiber' has been the magic word in the telecom industry for the past six months, ever since Verizon, BellSouth and SBC issued their joint RFP for fiber-to-the-premises equipment. Yet even [...]

In technological terms, the telecommunications infrastructure is an unappreciated marvel. Despite being built on a foundation that was poured more than 100 years ago, the tangle of copper and fiber [...]

Byline: Bill St. Arnaud Given the ever-rising number of bankrupt and troubled telecom carriers, large enterprise customers now find it challenging at best to confidently select a long-term, low-cost provider [...]

Byline: Lynnette Luna Big LAN on campus It used to be that high schoolers looked at qualities such as academics and cost when determining which college they were going to [...]

Byline: Tim McElligott Session Initiation Protocol, or SIP, has no shortage of champions. Some of them, such as WorldCom, have begun to lay down heavy bets. dynamicsoft has bet it [...]

Welcome, fans, to 2002. We present another year of engineering, which we will again attempt to disguise as interesting reading material, with various amounts of success. While I don't often [...]

When any product is in its infancy, it's up for grabs what shape it will assume. Take cars for example. We're used to them having four wheels, a circular steering [...]

While dense wave division multiplexing (DWDM) and SONET have assisted in meeting the bandwidth and capacity requirements of Internet traffic, they cannot enable carriers to deliver new revenue generating services, [...]

Some called 2001 the worst year in history. Others characterized it as the year that switch fabrics came back into the spotlight. Still others looked at it as the final [...]

Time to market and time to volume play an essential role in the competitive environment of today's wireless communication business. One of the most important elements enabling well-managed product launches [...]

Many articles are devoted to spectral regrowth in wireless communication systems. The most unpleasant consequences are created by nonlinear effects in RE power amplifiers (PA) at high output power levels [...]

Picometrix, a business of $25 million-capitalized Advanced Photonix supplying high-speed optical receivers and terahertz instrumentation, has announced a 100G DP-QPSK design win with a tier 1 China-based telecom equipment and [...]

Responding to the challenge of divestiture and deregulation, and the growth of multi-vendor networks, suppliers of data test equipment are making their devices smaller, lighter, more capable, easier to use [...]

HOW TDR PROBES OUTSIDE PLANT FOR GLITCHES ONCE a technique reserved for laboratory or engineering personnel, Time Domain Reflectometry (TDR) is finding its way into daily use for cable fault [...]

Path length problems yield to smart circuit Surprising side effects from the breakup of the Bell System and the proliferation of Other Common Carriers (OCCs) are surfacing as the North [...]

Echo cancellers help meet network needs On May 30, 1985, a significant step forward will be made for telecommunications in the Arab world. The Arabsat satellite will be launched by [...]

How does fiber measure up? Fiber optics is a new and dynamic technology. It is an impatient technology, rushing to push the state-of-the-art to its limits. Emphaticallly it is not [...]