G

G

Giga-

G/NET

Gateway Communications, Inc.'s G/NET product uses the CSMA/CA protocol and runs at a transmission speed of 1.43Mb/s. Designed for small networks with fewer than 20 nodes, G/NET can accommodate a maximum of 254 nodes, although it is done quite slowly. G/NET NICs are connected using either RG-58/U (50ohm), RG-59/U (75ohm), or RG-62A/U (93ohm) cable. The /U indicates low loss cable. Although G/NET is a bus topology, it does allow for patch cables up to six feet in length to run from the main bus but there are good reasons not to use them. Patch cables can produce reflections or duplicate signals on the main bus cable. Experience has shown that even one patch cable can cause a drag in network performance or a complete workstation failure, regardless of where the patch cable is located in the network. It is much more advisable to run the main bus up to the back of each PC. If the convenience of a patch cable is required, for instance, when only one cable comes out of the wall instead of two, sources are available that can supply a trustworthy patch, which actually consists of two cables inside of one sheath.

GAIN

The increase in signaling power as an audio signal is boosted by an electronic device. It is measured in decibels.

GATEWAY

A network node that operates as an interface between different network types. Also a gateway server. A special purpose computer that connects networks and routes packets from one network to another. A gateway translates all seven protocol layers between computers with different upper-layer protocols, operating systems, and network media types. "Gateway" can also be used as another name for a router. With databases, a gateway causes a target DBMS to appear to the application as a copy of the selected DBMS. Allows DBMS "A" to use data from DBMS "B" by making "B"'s data files look like DBMS "A" files to DBMS "A". Each pairing requires a different gateway.

GATEWAY SERVER

A personal computer that runs NetWare SNA Gateway or NetWare SNA Gateway ELS software, and has a LAN adapter, and a host interface adapter that enables data transmission between gateway workstations and a host computer.

GATEWAY WORKSTATION

A personal computer in a LAN that is connected to the gateway server and runs NetWare 3270 LAN Workstation software.

GB

Gigabyte

GB/S

A billion bits per second.

GDT

Gas Discharge Tube

GGP

Gateway Gateway Protocol

GHZ

Gigahertz

GLOB TOP

A PBGA that uses a liquid encapsulation instead of overmolded epoxy.

GLOBAL OUTDIAL

A modem connected to the Internet than you can use to dial out, capable of calling long distance. See Internet OutDial.

GLOBBING

Refers to the expansion of wildcards for remote file names.

GOD

See Global OutDial.

GOPHER

Similar to Archie, but oriented to documents. See Archie.

GOSIP

See Government Open Systems Interconnection Profile.

GOVERNMENT OPEN SYSTEMS INTERCONNECTION PROFILE

An OSI NSAP addressing format to interconnect US government systems.

GPS

Global Positioning System

GRABBER

Software that supports exchange of data in video memory between non-Windows applications and Windows 3.x.

GRADIENT

In graphics, having an area smoothly blend from one color to another, or from black to white, or vice versa.

GRAPHICAL USER INTERFACE

(GUI) An interface (or a whole application, such as Microsoft Windows, that lies on top of other applications) that provides a user interface based on graphical icons that allows users to choose commands and other options by pointing to a graphical icon and then activating the choice with either the keyboard or a mouse.

GRAPHICS

Graphics Protocol

GRAY CODE

A binary numbering system modified so that only 1 bit changes each time the counting number increases.

GRAY SCALE

Variations of values from white through shades of gray to black in digitized image; black usually assigned digital value 0, while white designated as some non-zero value.

GREP

Search a file for a pattern

GROUP

In Windows, a collection of applications in the Program Manager window.

GROUP COVERAGE

A feature (of the AT&T Merlin Legend system) used by a designated individual to answer calls for a group of co-workers. See Individual Coverage and Coverage.

GSM

Global Standard for Mobile Communications

GSSA

Gallium Arsenide

GTPAC (T)

Glob Top Pad Array Carrier

GUARD TIME

A period of time during which the modem must not receive characters. The escape sequence has a guard time to ensure that data sent from a remote modem isn't interpreted as an escape sequence. For the modem to interpret an escape code as valid, there must be a set time before and after the escape sequence in which the modem doesn't receive any characters.

GUI

See Graphical User Interface.