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G
G.992.1 — See ITU-T Rec. G.992.1.
Garbage Collection Timer — Timer used in a distance-vector network that represents the
time remaining before a route is removed from the routing table.
G-CDR — GGSN call detail record. Collection of charges in ASN.1 format
that is eventually billed to a mobile station user.
Generalized Multiprotocol Label Switching — See GMPLS.
generated route — Summary route that uses an IP address next hop to forward packets
in an IP network. A generated route is functionally similar to an
aggregated route.
generic routing encapsulation — See GRE.
GGSN — Gateway GPRS support node. A router that serves as a gateway
between mobile networks and packet data networks.
Gigabit Ethernet — Term describing various technologies for implementing Ethernet
networking at a nominal speed of one gigabit per second. Gigabit Ethernet
is supported over both optical fiber and twisted-pair cable. Physical
layer standards include 1000Base-T, 1 Gbps over CAT-5e copper cabling,
and 1000Base-SX for short to medium distances over fiber. See also Ethernet, Fast Ethernet.
Global System for Mobile Communications — See GSM.
GMPLS — Generalized Multiprotocol Label Switching. A protocol that extends
the functionality of MPLS to include a wider range of label-switched
path (LSP) options for a variety of network devices.
GMT — See UTC.
GPRS — General Packet Radio System. A packet-switched service that
allows full mobility and wide-area coverage as information is sent
and received across a mobile network.
graceful restart — Process that allows a router whose control plane is undergoing
a restart to continue to forward traffic while recovering its state
from neighboring routers. Without graceful restart, a control plane
restart disrupts services provided by the router.
graceful Routing Engine switchover — See GRES.
graceful switchover — JUNOS software feature that allows a change from the primary
device, such as a Routing Engine, to the backup device without interruption
of packet forwarding.
gratuitous ARP — Broadcast request for a router’s own IP address to check
whether that address is being used by another node. Primarily used
to detect IP address duplication.
GRE — Generic routing encapsulation. A general tunneling protocol
that can encapsulate many types of packets to enable data transmission
through a tunnel. GRE is used with IP to create a virtual point-to-point
link to routers at remote points in a network. See also tunneling protocol.
GRES — Graceful Routing Engine switchover. In a router that contains
a master and a backup Routing Engine, allows the backup Routing Engine
to assume mastership automatically, with no disruption of packet forwarding.
group — Collection of related BGP peers.
group address — IP address used as the destination address in a multicast IP
packet. The group address functionally represents the senders and
interested receivers for a particular multicast data stream.
G.SHDSL — Symmetric high-speed digital subscriber line (SHDSL). Standard
published in 2001 by the ITU-T with recommendation ITU G.991.2 G.SHDSL.
G.SHDSL incorporates features of other DSL technologies such as asymmetrical
DSL (ADSL). See also SHDSL, ADSL.
GSM — Global System for Mobile Communications. A second-generation
(2G) mobile wireless networking standard defined by ETSI that uses
TDMA technology and operates in the 900-MHz radio band. See also TDMA.
GTP — GPRS tunneling protocol. A protocol that transports IP packets
between an SGSN and a GGSN. See also tunneling
protocol.
GTP-C — GGSN tunneling protocol, control. A protocol that allows an
SGSN to establish packet data network access for a mobile station. See also tunneling protocol.
GTP-U — GGSN tunneling protocol, user plane. A protocol that carries
mobile station user data packets. See also tunneling
protocol.
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