« ADSL and broadband internet connectivity »
Glossary of broadband terminology: H
- HAN
- Home Area Network. As it suggest, a small network for home users.
- HDSL
- HDSL - High Rate Digital Subscriber Line
- HDSL2
- .
- HDSL Transmission Unit - Central Office
- The HDSL modem or line card that physically terminates an HDSL connection at the telephone service provider's serving central office.
- HDSL Transmission Unit - Remote
- The HDSL modem or PC card that physically terminates an HDSL connection at the end user's location.
- HDT
- Host Digital Terminal.
- Hertz
- The basic unit of frequency measurement; one cycle per second.
- High Bit Rate Digital Subscriber Line
- Modulation method that enables T-1and E-1 signals to be delivered over two and three pairs of copper wire respectively. Originally designed to bypass costly repeater installation required to provision T-1 and E-1 services to the far flung, HDSL is now being positioned in single-pair configurations that will deliver up to 768Kbps to residences.
- High Density Bipolar-3
- A bipolar coding method that does not allow more than three consecutive zeros.
- High Pass Filter
- A signal filter which would be installed in a customer premises ADSL modem (ATU-R), which only allows higher frequency data to be delivered to the modem. See Low Pass Filter.
- Hybrid Fiber Coax
- A cable TV delivery system that uses fiber optics to feed a distribution node that delivers video traffic over coax cable to about 500 homes.
- Hyper-Text Markup Language
- An authoring software used on the Internet's World Wide Web. HTML is basically ASCII text surrounded by HTML commands.
