H
half-duplex

A mode of operation that allows only a single station to successfully transmit a frame at a given time.

hertz (H2)

Electrical wave frequency in cycles per second. One hertz (Hz) equals one cycle per second.

High-Level Data Link Control (HDLC)

A frame encapsulation and protocol used across wide area point-to-point links.

high performance parallel interface (HIPPI)

A high-performance interface standard defined by ANSI, typically used to connect supercomputers to peripherals and other devices.

High Speed Serial Interface (HSSI)

A physical-layer interface for serial communications between a DTE (for example, a router) and a DCE (for example, a DSU/CSU) that supports up to 52Mbps.

High Speed Token Ring ...

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