Universal Asymmetric Digital Subscriber Line

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Universal Asymmetric Digital Subscriber Line ( UADSL ) is an American, simplified, slow DSL variant that works without a splitter .

history

The standard was developed by a working group of leading industrial and telecommunications companies, the Universal ADSL Working Group , based on the ITU standard T1.413 as a simple, inexpensive DSL variant. The development was standardized as G.lite in the ITU standard G.992.2. This technology has not caught on internationally because of its (ultimately also cost) disadvantages.

technology

UADSL is an ADSL variant that is offered exclusively in the USA and does not require a splitter in order to reduce installation work and costs. In comparison with ADSL , only 128 carrier frequencies are used here instead of 256 . Under ideal conditions, which are normally not achieved in actual use, UADSL delivers a data transfer rate for downloads of 1.5 megabits per second. Due to the high error rate, the providers only guarantee a transfer rate of 64 kilobits per second.

disadvantage

Simultaneous telephone connections were disrupted during data transmission, so that a splitter was often used nonetheless and a considerable part of the planned cost advantage was lost. ADSL modems were used that contained a high-pass filter and had a low-pass filter built into their telephone sockets . Devices were also brought onto the market which integrated a low-pass filter as a "knob" into the connection cable for the telephone. But that only meant that the splitter used is not an additional, independent device as with ADSL, but that its inner workings are integrated in the ADSL modem.

While the same ADSL modems work in the most varied of countries today, and only the splitters differ from country to country, UADSL requires a separate device variant of the ADSL modem for each country due to the integrated splitter. UADSL can therefore not achieve the number of units as ADSL and thus also not the cost advantages associated with mass production.

Another disadvantage results from the integrated splitter in the ADSL modem. If the modem fails due to a technical defect, the telephone can no longer be operated.