A mobile wireless transmission type that allows communication in both directions but in only one way at a time, for example "push to talk."
High Density Bipolar Three Substitution (HDB3)
Type of line code used in E1 type systems. Replaces four consecutive zero bits with one of two patterns. The two patterns ensure that consecutive violations/replacements are of different polarity. Similar to B3ZS in T1.
High-level Data Link Control (HDLC)
A bit-oriented synchronous data link layer protocol, providing both connection-oriented and connectionless service. It is used to connect one device to another with Asynchronous Balanced Mode (ABM).
High bit rate Digital Subscriber Line (HDSL)
1.544 Mbps over two copper twisted pair wires. One of four types of DSL technologies used to interconnect local telephone exchanges or high speed data across large enterprises. Operates at T1 speed so as to reuse existing infrastructure.
High availability Seamless Redundancy (HSR)
HSR is a redundancy protocol for Ethernet networks requiring short reaction times and high availability, as for example protection systems at electrical substations.
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