Looking Back Five Challenging Years
By Nicole Westmoreland
This April 2000 issue marks the 5-year anniversary of
Communication Systems Design
. The analog landscape has undergone a major
face-lift with technologies like digital communications and the Internet creating a complex design environment of mixed signals and converging technologies.
Data Over Cellular: A Look at GPRS
By Doug Grant, Esben Randers, and Zoran Zvonar
While we wait for 3G to emerge, another data-over-cellular system has emerged from the labs. GPRS is an extension of the GSM system and uses the same channels, same modulation, and same network backbone as
the existing GSM network.
POS-PHY Level 3: Enabling High-Speed Networking Applications
By Jeff Camillo
The demand for Internet-based services is driving network equipment designers to develop new switches and router port cards to support multiservice traffic and aggregate bandwidths up to OC-48 and beyond. These new products must support existing Frame Relay and ATM infrastructures, and emerging traffic types such as POS/SDH and
Gigabit Ethernet.
Hardware Implementations of Multirate Digital Filters
By Tony San
It’s important to efficiently map interpolation and decimation functions into hardware, but the challenge is in choosing the right hardware types. Here’s a look at DSP, PLD, and ASIC implementations for multirate filters.
IP Telephony Intergateway Protocols
By Alan Percy
The
technical challenge of building a scaleable network of end devices and gateways is greater than expected. A number of protocols have been defined that allow IP telephony systems to intercommunicate: H.323, MGCP, and SIP.
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