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Technology Stocks : Dell Technologies Inc.

DELL 130.32

-2.1%

12:40 PM EST

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To: Boplicity who wrote (120444)	4/25/1999 9:56:00 AM
From: Mohan Marette	Read Replies (3) of 176387

<--OT-->Think Broadband--->All'bout DSL I hear within the year DSL and its various flavors will be catching on like wild-fires. Radio Shack just announced they will be offering the service soon in cooperation with NorthPoint Communications (IPO-expected pricing 3rd week of May-Lead underwriter Goldman Sachs) Verio and local phone companies are in the run as well as you know.It appears that these guys will be in direct competition with the Cable modem guys.Very interesting. DSL (Digital Subscriber Line) A technology that dramatically increases the digital capacity of ordinary telephone lines (the local loops) into the home or office. DSL speeds are very much tied to the distance between the customer and the telco central office. The technology is geared to Internet access with its asymmetric versions (faster downstream than upstream) and short haul connections with symmetric versions (same rate coming and going). Unlike ISDN, which is also digital but travels through the switched telephone network, DSL provides "always-on" operation. At the telco central office, DSL traffic is aggregated in a unit called the DSL Access Multiplexor (DSLAM) and forwarded to the appropriate ISP or data network. Although DSL technologies are just emerging, there have been more versions and alphabet soup than most any other new transmission technology. The widely-touted Asymmetrical DSL (ADSL) is available in two modulation schemes: Discrete Multitone (DMT) or Carrierless Amplitude Phase (CAP). DMT is expected to prevail. ADSL and its variants can share the same line as the telephone, because they use higher frequencies than the voice band. However, a POTS splitter must be installed on the customer's premises to separate the line between voice and ADSL. A version of ADSL, known as G.lite or Universal ADSL (also ADSL Lite and splitterless ADSL), eliminates the splitter, but other phones on the line may have to plug into low-pass filters to isolate them from the ADSL frequencies. Stay tuned! CDSL (Consumer DSL) is an asymmetric flavor that supports regular 56 Kbps V.90 modem access if ADSL is not available. RADSL (Rate adaptive DSL) adjusts speeds based on signal quality. IDSL (ISDN DSL) merely provides ISDN speeds. It does not support voice or go through the switched telephone network as does ISDN. HDSL (High Bit Rate DSL) has been the most widely-used DSL technology, providing T1 speeds over existing twisted pair without requiring the additional provisioning required for setting up T1 circuits. SDSL (Single Line DSL) is an HDSL variation that uses only one pair of cables instead of two. HDSL and SDSL cannot share lines with telephones. VDSL (Very High Bit Rate DSL) is expected to be used as the final drop from a fiber optic junction point to nearby customers. VDSL's extremely high capacity would let an entire apartment or office complex obtain high-bandwidth services using existing copper wires without having to replace the entire infrastructure with optical fiber. Like ADSL, VDSL can share the line with the telephone. See ATU-C and ATU-R.

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