Cisco ASR 5000 Series Product Overview Download

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Glossary

Environmental Information ▀

Cisco ASR 5000 Series Product Overview ▄

OL-22938-02

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.

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.

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