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G
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Gateway
An entrance and exit into a communications network. These may be large or small, and are
technically electronic repeater devices that intercept and steer electrical signals from one network
to another. A hardware or software set-up that translates between two dissimilar protocols.
Gateway Protocol Converter
An
application-specific node that connects otherwise incompatible networks.
Converts data
codes and transmission protocols
to enable inter operability. (Contrast Bridge)
GFC - Generic Flow Control
A field in the
ATM header which can be used to provide local functions. It has local
significance
only and the value encoded in the field
is not carried end-to-end.
GHz - Gigahertz
A measurement of the
frequency of a signal equivalent to one billion, or one thousand million,
hertz, or cycles per second.
Gigabits
One thousand million bits.
One billion bits. Or more precisely 1,073,741,824 bits.
Glare
Glare occurs when both ends of a
telephone line or trunk are seized at the same time for different
purposes or by different users.
GMT - Greenwich Mean Time
Zulu Time
GMT is 6 hours later than Central Standard Time (CST in the northern
hemisphere Winter)
and 5 hours later than
Central Daylight-Savings Time (CDT in the northern hemisphere Summer).
GMT (Zulu Time) is always the same worldwide.
Communication network switches are typically
coordinated on GMT.
Gopher
Internet public database
browsing and searching program.
GOS - Grade of Service
A quality of the
signal along out customer lines and the amount of blocking due to the
concentratable
ration used for the customer's
service. A term associated with telephone service indicating the
probability that a call attempted will fail or
receive a busy signal, expressed as a decimal fraction.
Grade of service may be applied to the busy hour or
to some other specific period.
Grandfathered
Something that has a right to
be a thing, or own a thing, by reason of it being or owning that thing
BEFORE laws or rules were introduced to formalize the
process.
Grooming
Managing bandwidth on a wide area,
public or private network to use the long haul transmission
facilities as effectively as possible.
Group Access Bridge
A device that permits
several people to converse with each other in a conference call, and which
permits individuals to join or leave the conference
call at will.
GS - Ground Start
A way of
signaling on subscriber trunks in which one side of the two wire trunk
(typically the "ring"
conductor of the Tip
and Ring) is momentarily grounded (often to a cold water pipe) to get
dialtone.
A GS trunk initiates an outgoing trunk
seizure by applying a maximum local resistance of 550 ohms
to the tip connector.
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