Personal wireless
Article Abstract:
Many unresolved issues and obstacles impede the actual implementation of personal wireless communications. Attempts to implement systems have failed. Personal Communications Systems (PCS) are allowed great leeway in frequency use from the Federal Communications Commission (FCC), but freedom promotes conflicts with existing technologies using allocated frequencies. The sophisticated devices necessary for PCS may also be difficult to manufacture at competitive prices. There are also conflicts over unlicensed PCS and whether the FCC will allocate bandwidth to it. Wireless local area networks (LANs) could also use unlicensed PCS, making its use greater than the use of licensed PCS. Installing cordless pay telephones, however, would be cheaper than covering an area with base stations. Possible developments include installing cells similar to cells for cellular telephone and a global PCS system.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1993
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Expert opinion: boundaries between communications technologies are blurring
Article Abstract:
Telecommunications and data communications are becoming less distinguishable as the two technologies advance toward one another. This trend is expected to accelerate in 1993 and in future years. The US Federal Communications Commission has begun to regulate personal communication services (PCS) and is awarding vouchers to several companies that can later be exchanged for PCS licenses for three out of 56 companies that are contenders for the licenses. PCS is a 2 GHz band presently used for microwave communications in railroads, electric utilities and public safety agencies. A frequency optimization plan is proposed by Apple Computer that could clear large segments of the 2 GHz band for emerging technologies and cut the cost of transition to emerging technologies. The Apple plan consolidates the loading of 2 GHz channels through retuning of stations.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1993
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Expert opinion: warming trend with turbulence in the lower layers
Article Abstract:
Data communications and telecommunications are changing rapidly as technology advances. Frame relay and the integrated services digital network (ISDN) are both getting rapid commercial deployment. Asynchronous transfer mode (ATM) switches may be used in local area networks (LANs) and wide area networks in 1993. Some ATM products are targeted at LAN applications supporting 155M-bit/sec access, thus making them more competitive with fiber distributed data interface rings. Telephone services and cable TV services are being changed by the US Federal Communications Commission's decision to permit local exchange carriers to enter the video dial-tone business. Bellcore has demonstrated the feasibility of transmitting pay-per-view movies over cooper local loops.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1993
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