Carrier Access Network Device Axxius 800 - Manual (Page 542)

Glossary - 10 Axxius 800 - Release 2.2
Glossary
GUI
GUI Graphical User Interface, pronounced "GOOEY". A set of screen
presentations and metaphors that utilize graphic elements such as icons
in an attempt to make an operating system easier to use.
High Density
Bipolar 3
(HDB3) A bipolar coding method that does not allow more than 3 consecutive
zeros.
High level Data
Link Control
(HDLC) The HDLC protocol secures information in a data frame that allows
devices to control data flow and correct errors. For any HDLC
communications session, one station is designated primary and the other
secondary.
hop Each individual short trip that packets make from router to router, as they
are routed to their destination is a Hop.
host A computer that allows users to communicate with other host computers
on a network.
hot-standby In a redundant DS3 controller setup, the standby controller can be in two
states, the hot-standby signifies that the card is ready to take over for the
active and the switch will not affect service. Also see cold-standby.
hub A common connection point for devices in a network. Hubs are
commonly used to connect segments of a LAN. A hub contains multiple
ports.
IP Internet Protocol
Integrated
Services Digital
Network
(ISDN) A technology offered by telephone carriers that allows for the rapid
transfer of voice and data. ISDN supports data transfer rates of 64 Kbps
(64,000 bits per second). Most ISDN lines offered by telephone
companies give you two lines at once, called B channels. You can use
one line for voice and the other for data, or you can use both lines for data
to give you data rates of 128 Kbps, slightly more than 2 times the data
rate provided by today’s fastest modems.