Cisco ASR 5000 series Product Overview page 985

Glossary
IP. Internet Protocol. A protocol used for the transmission of packetized data. Part of the TCP/IP suite of
communications protocols.
IP in IP. Refers to the encapsulation of an inner IP header with an outer IP header for tunneling configuration.
IPSec. IP Security. A multi-functional encryption technique used to transport packetized data in an un-readable fashion
across multiple network devices.
IPv4v6 capability. capability of the IP stack associated with a UE to support a dual stack configuration with both an
IPv4 address and an IPv6 address allocated.
ISAKMP. Internet Security Association and Key Management Protocol. In IPSec negotiations, this protocol allows the
receiver to obtain a public key and authenticate the sender using digital certificates.
ISP. Internet Service Provider. A vendor, or telecommunications carrier, who provides Internet access services to
customers.
IuPS. The interface between the Radio Network Controller (RNC) in the UTRAN and a 3G SGSN. Supports both
control plane and user data plane signalling, transmitting IP over ATM.
IWF. Inter-working Function. Describes a device that is located between the MSC and the Internet, used to connect
wireless subscribers to the Internet through 2G and 2.5G networks.
L
L2TP. Layer 2 Tunneling Protocol. Communications protocol used to establish tunnels between network devices to
securely transport data.
LAC. (1) for data tunneling within a VPN environment: L2TP Access Concentrator. A LAC connects an L2TP tunnel
from a subscriber to a peer LNS. (2) for mobility management: Location Area Code: identifies an area in a PLMN
within which the MS/UE can move without the need of a location update to the VLR.
LAN. Local Area Network. Used to denote group or groups of physically inter-connected network devices that are
capable of sharing information with each other.
Last Visited Registered TAI. A TAI which is contained in the TAI list that the UE registered to the network and which
identifies the tracking area last visited by the UE.
LC. Line Card. Rear-installed card within the system that provides physical network connectivity. Most LCs have
physical external network interfaces.
Linked Bearer Identity. This identity indicates to which default bearer the additional bearer resource is linked.
LNS. L2TP Network Server. An LNS terminates an L2TP tunnel from a peer LAC and provides a network connection
through the tunnel.
Logical Port. A subdivision of a physical port or interface within the system.
LR. Location Registration. An MS which is IMSI attached to non-GPRS services only performs location registration by
the Location Updating procedure. A GPRS MS which is IMSI attached to GPRS services or to GPRS and non-GPRS
services performs location registration by the Routing Area Update procedure only when in a network of network
operation mode I. Both location updating and routing area update procedures are performed independently by the GPRS
MS when it is IMSI attached to GPRS and non-GPRS services in a network of network operation mode II or III. An MS
which is attached via the E-UTRAN performs location registration by the tracking area update procedure.
LRSN. Local Record Sequence Number. The SGSN or GGSN includes this node-specific, unique sequential number in
every partial or complete CDR.
LSA. Localised Service Area. A localised service area consists of a cell or a number of cells. The cells constituting a
LSA may not necessarily provide contiguous coverage.
M
Mapped EPS security context. It is a mapped security context to be used in EPS.
MBMS-dedicated cell. cell dedicated to MBMS transmission.
OL-22938-02
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