The downstream data capacity is much higher than
The downstream data capacity is much higher than upstream, hence the descriptor asymmetric. Typical maximum downstream rates range from 1.5 up to 8 Mbit/s, and upstream up to 1 Mbit/s. The actual performance varies from supplier to supplier, and upon the local propagation conditions. ADSL is good for large file downloads and receiving streaming files. The drawback is that the client can transmit data only at a lower rate (maybe 300 kbit/s), so it is not going to be suitable for a home webcasting station. For such applications the HDSL connection is a better option, albeit at higher cost. The ADSL splitter is a passive device, so the telephone service will still operate normally, even when the modem is not powered. Rate-adaptive DSL Rate-adaptive DSL is an option where full specification DSL is not possible. The data rate adapts to the propagation conditions. The bandwidth is not guaranteed, but depends upon the distance from the CO. G.lite A key factor in providing low-cost ADSL circuits is to avoid a truck roll for the installation. G.lite was developed from full specification ADSL (called g.dmt) as a system that could be installed simply by the consumer. G.lite does not require the installation of a splitter, so it often is referred to as splitterless. Many consumer systems do not give very good results with splitterless systems. The solution is the use of a low-cost filter in the line to each device. Other DSL standards You may come across a number of other abbreviations related to DSL: Symmetric DSL (SDSL or SHDSL) This new development gives equal up and down bandwidths and offers a lower cost alternative for E1/T1 lines. It is popular with business users with servers that need a higher upstream bandwidth that ADSL offers. MSDL (moderate speed DSL) Does not achieve CSA range at T-1 rates but can satisfactorily offer lower rates (512 or 384 kbit/s), so still holds advantages over an analog modem or ISDN. VDSL (very high speed DSL) Used for a final short-distance copper link from fiber to the curb (FTTC) systems. It can achieve T-3 data rates (45 Mbit/s) over 1,000 ft. 34 The Technology of Video and Audio Streaming
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