Bell Labs: a perfect 10?
Article Abstract:
Lucent Technologies' Bell Labs has patented Direct Sequence/Pulse Position Modulation, a technology that boosts wireless LAN transmission speeds to 10 Mbps. DS/PPM represents an improvement over the maximum rate of around 2Mbps found in contemporary networks. Analysts from several different research organizations believe a 10Mbps transmission rate will expand the appeal of wireless LANs for both users and IT professionals. Businesses and college campuses, some of which have avoided wireless technology, will have the opportunity to change their communications methods. DS/PPM holds several advantages over other LAN technologies. DS/PPM, which operates on the 2.4GHz bandwidth, lowers interference and noise through Direct Sequence Spread Spectrum (DSSS) technology. PPM derives 8Mbps of data transmission speed from the individual appearance of pulse position and correlation on the I and Q channels.
Publication Name: PC Portables Magazine
Subject: Computers and office automation industries
ISSN: 1095-5070
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
E-mail service deals from Wynd Communications
Article Abstract:
Wynd Communications' WyndMail wireless e-mail service uses Mobitex or the RAM Mobile Data Network. Users can send as many as 200 150-character messages with WyndMail's $29.95-per-month Basic Package. Users of the Basic Package can send and receive e-mail with attachments and faxes. Users can also send text messages to telephones. Filtering and auto-forward capabilities are included. The $149.95-per-month Unlimited Service provides a user with a single phone number for message forwarding. Unlimited Service also supports conference calling and call waiting. WyndMail subscribers will have to buy a wireless modem, about $500, or rent one from Wynd Communications for $40 per month with an option to by. RAM covers virtually all the nation's major metropolitan areas.
Publication Name: PC Portables Magazine
Subject: Computers and office automation industries
ISSN: 1095-5070
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
Seeing is believing
Article Abstract:
Players in the wireless industry are only seeing what they want to see: a future with the potential for big money and seamless wireless communications. However, users have been slow to enter the wireless market because of proprietary technologies and high prices. According to an Andersen Consulting survey, wireless operators in the US lose roughly 30% of their customers. A new open standard, Handheld Device Transport Protocol (HDTP), proposed by Unwired Planet allows carriers to provide Internet access from handheld devices. Several vendors are planning products and services based on HDTP, including AT&T Wireless. With widespread support of HDTP, wireless carriers will be able to offer a wide variety of value-added services.
Publication Name: PC Portables Magazine
Subject: Computers and office automation industries
ISSN: 1095-5070
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Fearless forecast. Heidi Roizen believes in Apple. When did you get multimedia?
- Abstracts: The NewMedia 500. Sleeping with the enemy. DirecPC takes on intranet multimedia delivery
- Abstracts: Jim Ludtke: Multimedia surrealist. Streaming for business
- Abstracts: The new storytellers. Anytime, anywhere learning. This Web site's for you
- Abstracts: Discreet Logic Paint and Effect. Communication central: chat and message boards build buzz. Graphics utilities for every medium