Cisco ASR 5000 Series, Обзор продукта

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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.
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.