Browsing: G
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G.703/G.704 |
ITU-T electrical and mechanical
specifications for connections between telephone company equipment
and DTE using BNC connectors and operating at E1 data rates.
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G.804 |
ITU-T framing standard that defines
the mapping of ATM cells into the physical medium.
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gateway |
In the IP community, an older term
referring to a routing device. Today, the term router is used
to describe nodes that perform this function, and gateway
refers to a special-purpose device that performs an application
layer conversion of information from one protocol stack to another.
Compare with
router.
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Gateway
Discovery Protocol |
See
GDP.
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gateway
host |
In SNA, a host node that contains a
gateway SSCP.
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gateway
NCP |
NCP that connects two or more SNA
networks and performs address translation to allow cross-network
session traffic.
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Gateway-to-Gateway
Protocol |
See
GGP.
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GB |
Gigabyte.
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GBps |
Gigabytes per second.
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Gb |
Gigabit.
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Gbps |
Gigabits per second.
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GDP |
Gateway Discovery Protocol.
Cisco protocol that allows hosts to dynamically detect the arrival
of new routers as well as determine when a router goes down. Based
on UDP. See also
UDP.
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generic
routing encapsulation |
See
GRE.
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Get
Nearest Server
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See
GNS.
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GGP |
Gateway-to-Gateway Protocol.
MILNET protocol specifying how core routers (gateways) should
exchange reachability and routing information. GGP uses a
distributed shortest-path algorithm.
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GHz |
Gigahertz.
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GID |
Global information
distribution. Process that runs on the NP of every
LightStream 2020 ATM switch in a network. GID maintains a database
and keeps nodes in the network apprised of changes in topology such
as ports, cards, and nodes being added or removed, and trunks going
up or down. This information is supplied by the ND process.
Sometimes called global information distribution daemon, or GIDD.
See also ND.
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GIDD |
Global information
distribution daemon. See
GID.
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gigabit |
Abbreviated Gb.
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gigabits
per second |
Abbreviated Gbps.
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gigabyte |
Abbreviated GB.
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gigabytes
per second |
Abbreviated GBps.
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gigahertz |
Abbreviated GHz. |
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global
configuration database |
See
configuration
database.
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global
information distribution |
See
GID.
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global
information distribution daemon |
See
GID.
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GNS |
Get Nearest Server.
Request packet sent by a client on an IPX network to locate the
nearest active server of a particular type. An IPX network client
issues a GNS request to solicit either a direct response from a
connected server or a response from a router that tells it where on
the internetwork the service can be located. GNS is part of the IPX
SAP. See also
IPX
and SAP
(Service Advertisement Protocol).
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GOSIP |
Government OSI Profile.
U.S. government procurement specification for OSI protocols. Through
GOSIP, the government has mandated that all federal agencies
standardize on OSI and implement OSI-based systems as they become
commercially available.
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Government
OSI Profile |
See
GOSIP.
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grade
of service |
Measure of telephone service quality
based on the probability that a call will encounter a busy signal
during the busiest hours of the day.
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graphical
user interface |
See
GUI.
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GRE |
Generic routing encapsulation.
Tunneling protocol developed by Cisco that can encapsulate a wide
variety of protocol packet types inside IP tunnels, creating a
virtual point-to-point link to Cisco routers at remote points over
an IP internetwork. By connecting multiprotocol subnetworks in a
single-protocol backbone environment, IP tunneling using GRE allows
network expansion across a single-protocol backbone environment.
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ground |
Electrically neutral contact point.
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ground
loop |
Arrangement that exists when a
multi-path connection exists between computers. Usually this occurs
when computers are connected to each other through a ground wire and
when computers are attached to the same network using twisted pair
cable.
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ground
station |
Collection of communications equipment
designed to receive signals from (and usually transmit signals to)
satellites. Also called a downlink station.
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group
address |
See
multicast
address.
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group
delay |
See
distortion
delay.
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guard
band |
Unused frequency band between two
communications channels that provides separation of the channels to
prevent mutual interference.
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GUI |
Graphical user interface.
User environment that uses pictorial as well as textual
representations of the input and output of applications and the
hierarchical or other data structure in which information is stored.
Conventions such as buttons, icons, and windows are typical, and
many actions are performed using a pointing device (such as a
mouse). Microsoft Windows and the Apple Macintosh are prominent
examples of platforms utilizing a GUI.
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gutter |
Type of wall-mounted channel with
removable cover used to support horizontal cabling. Gutter is big
enough to hold several cables.
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