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Available duct space for optical-fiber cable in the campus backbones of many LANs is approaching or is at its maximum capacity. Concerns about business disruption and damage to existing infrastructure, [...]

There are three laws of networks. 1) Networks never get slower. 2) Networks never get smaller. 3) Networks never stay the same. Network end users and system designers are constantly [...]

There is increasing demand for broadband wireless personal area networking devices, mainly fuelled by mobile multimedia applications such as wireless home networks. This paper investigates the suitability of iterative equalisation as a means of achieving low bit and packet error rates in a future high data rate personal area network standard. Baseband simulation results demonstrate the powerful ISI mitigation and error correcting performance of such receivers when operating in representative indoor wideband channels.

This article presents a performance evaluation of various multi-antenna concepts based on OFDM for Wireless LANs. The studies are based on state-of-the-art measured channel data in the 5GHz band. The investigated techniques include: spatial multiplexing (BLAST), space frequency trellis coded modulation, their concatenation, turbo bit interleaved coded modulation and turbo space frequency trellis coded modulation. The studies aim to assess the MIMO concepts for future high speed WLANs. Index Terms--MIMO, WLAN, Space-time, OFDM.

Five local area network (LAN) switches from 3Com Corp, Bay Networks, Compaq Computer Corp, Extreme Networks and Packet Engines Inc were tested and compared in terms of plug and play, latency, interoperability, trunking and virtual LANs and distance. Results showed that Gigabit Ethernet works at one kilometer in all five Gigabit access switches, namely, SuperStack II Switch 3900, Accelar 1050, Compaq 5422, Summit 48 and PowerRail 1000. Furthermore, all the models have high throughputs due to their application specific integrated circuit-based switch designs., Can Ethernet really run at gigabit speeds? In the first of two reports, we test products with gigabit uplinks. If your LANs are 10-Mbps or 100-Mbps Ethernet - and most [...]

The digital subscriber line (DSL) is the best way that a telecommunications company can provide high-speed Internet access and local area network access. DSL is an overlay technology, making it more feasible for deployment and economical than hybrid fiber-coax and fiber-to-the-curb. The cost of services using this technology can reach to only $60 monthly with single payment of $225 for the cost of modems and installation., The business case for DSL deployment says you don't have to cannibalize existing services just to get new revenue. THE MARKETS FOR HIGH-SPEED INTERNET ACCESS AND CORPORATE LOCAL AREA NETWORK [...]

LAN equipment manufacturers are reducing the prices of their products as computer networks move from the use of shared hubs to switches and from routers to routing switches. This product transition is manifested in market trends which seem to point towards greater use of Ethernet switching in computer networks. This transition from hubs and routers to switches is expected to continue as more price cuts are implemented. The rate by which this transition will be completed will depend on the initial difficulties that will be encountered by network managers in the use of these devices., Look for switching to challenge routers and displace hubs, while per-port prices continue to fall Do falling stock and product prices signify a saturated LAN equipment market? We at the [...]

ATM, switched Ethernets, frame relay, virtual private networks-those technologies aren't for the faint of heart. But for VARs who can negotiate the uncertainties and complexities, internetworking offers plenty of rewards. […]

Three new types of patch panels for local area networks have recently been introduced in the market. The panels, namely, the wireless patch panel, the electronic patch panel and the intelligent patch panel, are all application-bound or designed for data-only requirements. The advantages and disadvantages of these three new panels are discussed., Three types of patch panels (wireless, electronic, and intelligent)have benefits and drawbacks, depending on the application. When it comes to making a move, add, or change in a voice/data cable [...]

IBM host-attached, multiprotocol bridger/routers may be developed before the end of 1994 by a joint venture between Wellfleet and Cabletron or Cisco and IBM. The financial and technical advantages of channel-attached, bridger/routers are that gateways and intermediate nodes are unnecessary and as a result, reduce equipment costs and increase bandwidth access into the hosts. Manufacturers have little experience developing these tools and IBM customers should be cautious about purchasing any of these units developed in the near future., The latest, 'bleeding-edge,' value-added feature that is being offered in the SNA internetworking market directly attaches multiprotocol bridge/routers to IBM hosts via a host's native I/O channels. On January 3, [...]

Remote access to corporate networks is a growing area of technology. With more users at remote sites using such mobile computers as laptops, the need is greater than ever. Dial-up remote control solutions are popular, but the problem of redundancy remains. Remote access through terminal emulation is short on flexibility. Remote access servers is the newest technology, offering simpler security and control., During the past five years, there has been explosive growth in corporate networks. Driven by PCs and the need for LAN connectivity, companies have built internets around TCP/IP using routers [...]

Future local area networks using more powerful hardware and applications will overwhelm the capabilities of existing 10BaseT technology. Three alternative technologies have emerged that can address the need for increased bandwidth. These are FDDI-over-copper unshielded twisted-pair wiring, 100-Mbps Ethernet and Asynchronous Transfer Mode (ATM). ATM will support any communication type and has scalable bandwidths, but has a higher initial price than the other technologies., 10BaseT wiring hubs and concentrators have transformed our LAN-scape. They have stimulated the evolution from physical bus to star topologies, provided a uniform wiring scheme and facilitated LAN installations and [...]

Switching hubs are the ideal vehicle for segmenting local area networks (LANs) to improve performance, functionality and flexibility of the LAN system. LAN Ethernets traditionally are segmented into smaller networks with bridges, which delay packet communications. Switching hubs enhance the speed of a LAN by switching packets among ports up to the ports' full bandwidth, thus reducing delays. Switching hubs also support switched connections between LAN segments and workstations., LAN performance, flexibility and functionality are largely affected by traffic and hub architecture. Here's how to make some choices about the latter. LANs start growing almost from the moment they're [...]

It takes more than a piece of cable to turn a printer into a network printer. This is a sophisticated beast, often placed some distance from users. So it has […]

California's state Health and Welfare Agency Data Center (HWDC) this month will begin offering a central local area network backup service to the 15 state agencies it serves. Later it […]

EMERGING VOICE-SERVER APPLICATIONS WILL REVOLUTIONIZE CALL PROCESSING, BUT THE BIG PICTURE IS FAR FROM COMPLETE. Picture Vanna poised in front of a ridiculously wordy "Wheel of Fortune" puzzle. The cryptic […]