High-speed voice and data link (HVDL) is a high speed voice and data

provisioning In telecommunication, provisioning involves the process of preparing and equipping a network to allow it to provide new services to its users. In National Security/Emergency Preparedness telecommunications services, ''"provisioning"'' equates to ...

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

local loop In telephony, the local loop (also referred to as the local tail, subscriber line, or in the aggregate as the last mile) is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the commo ...

s. Most

DSL Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines. In telecommunications marketing, the term DSL is widely understood to mean asymmetric dig ...

technologies ( Etherloop in particular) work well up to about 18,000 feet (5.5 km) on a 24 AWG copper pair. Reach DSL supports lengths up to approximately 32,800 feet (10 km). HVDL has a theoretical maximum loop length of approximately 112,000 feet (approximately 34 km). Such a distance would require

repeater In telecommunications, a repeater is an electronic device that receives a signal and retransmits it. Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction. Som ...

(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 A line card or digital line card is a modular electronic circuit designed to fit on a separate printed circuit board (PCB) and interface with a telecommunications access network. A line card typically interfaces the twisted pair cable of a plain ...

. 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/

Ethernet Ethernet () is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 1 ...

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

customer-premises equipment In telecommunications, a customer-premises equipment or customer-provided equipment (CPE) is any terminal and associated equipment located at a subscriber's premises and connected with a carrier's telecommunication circuit at the demarcation po ...

(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.

External links

HVDL vendor
Charles {{DSL technologies Communication circuits Digital subscriber line