Cisco ASR 5000 series Product Overview page 983

Glossary
G
GBR bearer. Guaranteed Bit Rate Bearer. An EPS bearer that uses dedicated network resources related to a guaranteed
bit rate (GBR) value, which are permanently allocated at EPS bearer establishment/ modification.
G-CDR. GGSN charging data record.
Ga interface. The interface between the GSN (either GGSN or SGSN) and the charging gateway (CG) uses GTPP to
communicate.
Gb interface. The interface between the SGSN and the 2G/2.5G RAN base station subsystem - usually the connection
with the BSS is to the PCU.
Gc interface. The interface used by the GGSN to communicate with the Home Location Register (HLR) via a GTP-to-
MAP (Mobile Application Part) protocol convertor.
General Purpose PDP Context. A PDP context without associated TFT filters where all the traffic is allowed,
including internet traffic. This may be a primary or a secondary PDP context. However, only one PDP context without
associated TFT filters can exist.
Gf interface. The SS7 interface between the SGSN and an EIR.
GGSN. Gateway GPRS Support Node. A device in a GSM GPRS/UMTS data network that performs data session
establishment, accounting, and traffic routing.
Gi interface. The interface used by the GGSN to communicate with Packet Data Networks (PDNs) external to the
PLMN.
Global Title (GT). A unique SCCP address (such as a mobile phone number) used to identify a destination. A global
title does not include routing information.
Global Title Translation (GTT). The SS7 mechanism that provides translation of the destination global titles to enable
message routing to the appropriate end-point.
Gn interface. The interface used between two GSN (GGSN and/or SGSN) in the same GPRS/UMTS Public Land
Mobile Network (PLMN). This interface serves as both the signalling and data path for establishing and maintaining
subscriber PDP contexts.
Go interface. The interface used by the GGSN to communicate with Policy Decision function (PDF) for provisioning
of policy for a PDP context bearer used for IMS session media flow transport.
Gp interface. The IP-based interface used between a GGSN and a GPRS support nodes (GSNs, e.g. GGSNs and/or
SGSNs) in a different PLMNs.
GPRS. General Packet Radio Service. The GSM version of 2.5G wireless data communications.
Gr interface. The SS7 interface between the SGSN and an HLR.
GRE. Generic Routing Encapsulation. A generic encapsulation protocols used to tunnel data between various networks.
Defined in RFC-2784. This protocol is mandated to be used in R-P and Mobile IP communications.
Gs interface. The SS7 interface between the SGSN and an MSC/VLR.
GSM. Global System for Mobile communications. One of three wireless technology classes that encompasses 2G, 2.5G,
and 3G communications. The other two are CDMA and TDMA.
GSN. GPRS Support Node can be either an SGSN or a GGSN.
GSS. GTPP Storage Server. An external backup/storage server for one or more types of CDRs: eG-CDRs, G-CDRs, M-
CDRs, S-CDRs, and/or SMS CDRs.
GTP. GPRS Tunneling Protocol. The protocol used between the GGSN and the SGSN.
GTP-C. The GPRS Tunneling Protocol (GTP) for the control plane handles signalling between GSNs within the core
network.
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