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Half Duplex |
| A circuit or device capable of transmission in two directions, however not simultaneously |
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Handoff |
| The process of transferring a wireless phone call in progress from one cell transmitter to another without interruption of service. |
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Hands Free Speakerphone |
| Feature on some wireless phones that allows the user to talk and listen to calls without lifting or holding the handset |
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Handshake |
| Sharing of signals between a wireless phone and a wireless communications system to establish call setup |
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Hard-Wired Connection |
| A permanent wire circuit between two devices |
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Hdsl |
| (High-Bit-Rate Digital Subscriber Line) A high-speed digital transmission that allows Local Exchange Carriers (LEC) to provide T1 data speed service over existing copper telephone lines. HDSL is typically used for wide-band digital transmission within a corporate site and between the telephone company and a customer. The main characteristic of HDSL is that it is symmetrical. |
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Home Coverage Area |
| Geographical area within which wireless phone calls are considered local calls and therefore do not incur long distance or roaming charges |
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Hook Switch |
| The button located in the base of the telephone, responsible for opening the circuit when no call has been made or received and for closing the circuit when a call is in progress; also known as the switchhook |
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Horizontal Distribution System |
| The general term for the system of cables, wires, and building features that permit individual offices on a given floor of a multistory building to be connected to the riser cable and, thereby, to lines and trunks from the central office |
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Hunt |
| The process by which a switch moves from contact to contact (phone to phone) until a connection is made. |
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Hunt Group |
| A series of central office lines arranged in such a manner that a call coming into the group will search for an idle line. If the call encounters a busy condition on the first line, the hunt will continue through the other lines until it locates an idle line. If it cannot locate an idle line in the entire group, it returns a busy signal to the caller. |
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Hybrid System |
| A telephone system that has attributes of both key telephone systems and PBXs. |
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