High Speed Voice and Data Link
- High Speed Voice and Data Link
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 in particular) work well up to about 18044 feet (5.5 KM) on a 24AWG copper pair. Reach DSL supports lengths up to approximately 32808 feet (10 kilometers). HVDL has a theoretical maximum loop length of approximately 112,000 feet (approximately 34 kilometers). This kind of distance would require repeater(s) and would probably only support a connection of 128kbit/s. The ideal speed for this service is 512kbit/s or 384kbit/s. This is programmed directly from the COT line card.
The signal is sent from the telco's central office as an ethernet style signal and is demuxed at the customer's premises by an POTS/Ethernet 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.
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