High Speed Voice and Data Link
Encyclopedia
High Speed Voice and Data Link (HVDL) is a high speed voice and data provisioning method that allows telcos and ISPs to provide up to three voice channels and data (up to 1Mbit/s) on a copper pair over extremely long loops.

Most DSL technologies (Etherloop
Etherloop
Etherloop is a kind of DSL technology that combines the features of Ethernet and DSL. It allows the combination of voice and data transmission on standard phone lines...

 in particular) work well up to about 18044 feet (5.5 km) on a 24 AWG copper pair. Reach DSL supports lengths up to approximately 32808 feet (10 km). HVDL has a theoretical maximum loop length of approximately 112,000 feet (approximately 34 km). This kind of distance would require repeater(s) and would probably only support a connection of 128 kbit/s. The ideal speed for this service is 512 kbit/s or 384 kbit/s. This is programmed directly from the COT line card
Line card
A line card or Digital Line Card is a modular electronic circuit on a printed circuit board, the electronic circuits on the card interfacing the telecommunication lines coming from the subscribers to the rest of the telecommunications access network.A line card commonly interfaces the twisted pair...

.

The signal is sent from the telco's central office as an Ethernet style signal and is demuxed at the customer's premises by a POTS
Plain old telephone service
Plain old telephone service is the voice-grade telephone service that remains the basic form of residential and small business service connection to the telephone network in many parts of the world....

/Ethernet
Ethernet
Ethernet is a family of computer networking technologies for local area networks commercially introduced in 1980. Standardized in IEEE 802.3, Ethernet has largely replaced competing wired LAN technologies....

 splitter. The box itself contains all the circuitry needed to split the data and voice channels. An Ethernet cable is run directly to the customer's PC or router, and the POTS lines within the home are connected to the POTS terminals inside the CPE unit. The CPE unit is powered from the telco's central office, and will continue to work during a power outage, and supports failover-to-POTS.
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK