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Technology Stocks : PairGain Technologies -- Ignore unavailable to you. Want to Upgrade?

To: Gary Korn who wrote (25643)	8/26/1998 9:36:00 AM
From: indy	Read Replies (1) \| Respond to of 36349

Gary Korn XDSL reference: westell.com DSL defined courtesy of Westall Digital Subscriber Line (DSL) technology, in its various manifestations (ADSL, SDSL, HDSL, RADSL, VDSL), is expected to have a dramatic societal impact on both our personal and professional lives. Stated simply, DSL provides high-speed multimedia services, such as video-on-demand, super-fast Internet access, distance learning and video phoning to anyone with a standard, copper telephone line. By placing DSL modems at both a phone company's central exchange office and at a customer location, a telco can enable its users to receive multimedia content more than 400 times faster than with today's 14,400 bps modems. It is the use of the ubiquitous copper network that has caused DSL to gain favor as a better alternative to ISDN and cable modems. Compared to other currently available technologies, DSL modems offer the highest transmission reliability, the fastest speeds and interactive capabilities, for the least investment. DSL modems available today can download the entire Encyclopedia Britannica in 31 minutes compared to 54 hours with a common 14,400 bps modem. Next generation DSL products currently being developed by Westell will cut this transmission time down to 6-8 minutes. ADSL (Asymmetric Digital Subscriber Line) ADSL delivers super-fast rates of 32 kbps to 8.192 Mbps downstream to the customer and 32 kbps to 1.088 Mbps upstream to the network while simultaneously providing phone service on the same standard phone line. With ADSL, interactive Multimedia services can be provided to almost anyone with a telephone line in their home or business. From a subscriber's perspective, ADSL is completely transparent. It is a modem-like technology, in that it is placed at either end of a telephone line. ADSL interfaces between digital sources containing information and provides a channel of communication very much like a typical analog modem. The primary difference however, is speed. ADSL is capable of throughputs from 1.544 Mbps to 8 Mbps over standard telco loops. RADSL (Rate Adaptive Asymmetric Digital Subscriber Line) RADSL is the rate adaptive variation of ADSL. The greatest benefit of this technology is its flexibility. RADSL allows the service provider to adjust the bandwidth of the DSL link to fit the need of the application and to account for the line length and quality. Through network management, the service provider can pre-define the bandwidth or allow it to be self-adjusting. This feature is particularly attractive to telephone operators as it allows them to tariff different rates for different bandwidths. Additionally, RADSL extends the possible distance from the subscriber to the central exchange office, thus increasing the percentage of homes served by DSL services. The rate adaptive characteristics of this technology allows the service provider to lower the data rate and extend the distance of the link. These "extended reach" data rates are significantly higher than analog modems. RADSL, like SDSL and ADSL, will relieve some of the congestion on voice networks, as it also supports POTS. This allows network providers to route data to the data networks and voice to the circuit switched networks versus both voice and data going through the circuit switched network as now done with analog modems and ISDN services. HDSL (High-bit-rate Digital Subscriber Line) The high cost and lengthy implementation time of traditional T1/E1 and fiber lines have businesses around the world scrambling for more bandwidth to accommodate applications such as LAN internetworking, video conferencing and PBX interconnect. As a result, more and more service providers are discovering High-bit-rate Digital Subscriber Line (HDSL) technology. HDSL will transport a full duplex T1 (1.544 Mbps) or E1 (2.048 Mbps) across existing twisted pair copper without repeaters. This high-performance technology is the quickest and most cost-effective option to deploy T1/E1 lines...and provides a quality transmission that is comparable to fiber! SDSL (Symmetric Digital Subscriber Line) This DSL technology provides symmetric (bi-directional) high-speed, variable rate communications. SDSL addresses those applications that require a symmetric data rate. SDSL data rates range from 160 kbps to 2.084 Mbps. VDSL (Very high-bit-rate Digital Subscriber Line) VDSL technology boosts the data rates of the subscriber line significantly. The closer the customer is to the central exchange office, the higher the data rate. A subscriber at a distance of 5000 ft away from the central exchange office can get a data rate of 13 Mbps, at 3000 ft that subscriber may attain data rates up 10 26 Mbps and at 1000 ft, a 51 Mbps data rate is possible.

To: Gary Korn who wrote (25643)	8/26/1998 9:44:00 AM
From: indy	Respond to of 36349

Gary Korn. Communications Terms available from MOT motserv.indirect.com Jim

To: Gary Korn who wrote (25643)	8/26/1998 9:50:00 AM
From: indy	Read Replies (1) \| Respond to of 36349

Gary Korn DSLAM: Digital Subscriber Line Access Multiplexer To satisfy ever-growing demands for bandwidth from the end customer, Regional Bell Operating Companies (RBOCs), Local Exchange Carriers (LECs), and Internet Service Providers (ISPs) are developing architectures which deliver broadband communications all the way to the home and business. A key element in this architecture integrates the use of ATM over ADSL -- the Digital Subscriber Line Access Multiplexer or DSLAM. Asymmetrical Digital Subscriber Line (ADSL) technology uses existing twisted-pair copper plant to potentially offer subscribers broadband services such as high-speed internet access, LAN interconnect for telecommuters, and video-on-demand. Asynchronous Transfer Mode (ATM) supports multi-media service delivery, and supports specific Quality of Service (QoS) guarantees for the various kinds of data traffic. Please see our ATM pages for a more complete discussion. The DSLAM is a network element (NE) that has been defined to support high-bandwidth applications at the edge of the public network. With the ability to support data and voice services over existing subscriber lines, the DSLAM can help RBOCs and ISPs minimize the cost and maximize the efficiency of their networks. Motorola Semiconductor will be a major supplier of these key technologies and offer complete system solutions to help equipment manufacturers realize full-featured, cost-effective products.

To: Gary Korn who wrote (25643)	8/26/1998 10:38:00 AM
From: hal jordan	Read Replies (1) \| Respond to of 36349

Gary, PAIR has incorporated SDSL into their DSLAM. It provides for higher upstream speeds than ADSL. It also uses 2B1Q line coding, the same line code RBOCs use for modern day T1 lines and ISDN. Therefore, it is very compatible with the frequency spectrum in cable binders, something ADSL can have trouble with. Hal