Alternating two-way communication path (one way at a time).
HDB3 - High Density Bipolar Three
A line interface standard for E1 which is similar to B8ZS, which
eliminates data streams with 8 or more consecutive zeros. Allows for
64Kbps clear channel capacity and still assures a minimum ones density
required by E1 lines.
HDLC- High-level Data Link Control
An ITU-T standard for a bit-oriented datalink-layer protocol on
which most other bit oriented protocols are based. Submitted by: Kieran
Taylor, WAN Editor, Data Communications
HML
Multiline Hunt Group. If first line is busy, rollover to the next
available line in the group
Hoot-n-Holler - also
known as a shout down
A voice only full time circuit
that connects a speakerphone in one location to a speakerphone in a
distant location. This type of circuit is normally open at all times to
allow two-way communications without having to pick up the receiver or
dial the phone. Speakerphones used in this type of circuit are full
duplex, transmit and receive units. This circuit is very similar to the
ARD and MRD and is also used by the financial industry.
HOP
A network connection between two distant nodes.
Hub
A group of circuits connected at
one point on a network. Enables
traffic concentration and economies of
scale. Hubs are located in larger cities throughout a network
for concentration and routing of calls from cities with lower
traffic demands.
Hybrid Key System
A CPE system
that has characteristics of both a key
system and a PBX system.
Hybrid
Object-Oriented System
A computer system that combines
object-oriented modeling and development methodology with
non-object-oriented techniques (such as relational databases). This approach complicates the
development and maintenance process and does not fully exploit the
potential of object-oriented technology. It is a tactic that is used
during the transition from legacy systems to fully object-oriented,
enterprise-wide software solutions.
Hypertext
Interactive on-line documentation technique. Allows the user
to select (e.g. mouse click) certain words or phrases and
immediately display related information for the selected item.
Hypertext requires a "tag" language (like Hypertext Markup Language)
to specify branch labels with a hypertext document.
