Glossary

H

H.323
An earlier multimedia IP protocol, associated with voice over IP (see VoIP).
Habbo Hotel
Believed to be the largest persistent virtual world (PVW).
HDTV
High definition television
High capacity access service request
An order for a stated amount of capacity/equipment (to be built or reserved) specifying obligations on the part of the telco and the interexchange carrier.
High-capacity link / service
Refers to tariffed, digital data transmission service equal to, or in excess of T-1 data rates (1.544Mbps).
HSDPA
High speed downlink packet access: technology upgrade to 3G cellular networks that accelerates download speeds beyond 3G/UMTS. Requires HSDPA-capable handsets.
HSP
Hosted service provider: operating on a one-to-many business model, an HSP combines the capabilities of an ASP and an ISP – offering applications delivered remotely, infrastructure services and web hosting as an outsourced service.
HSUPA
High speed uplink packet access
Hub
Designated wire centre at which bridging, multiplexing or connections to other services are performed for traffic including voice, data and multimedia content.
HVAC
Heating, ventilating and air-conditioning (systems)