Cisco ASR 5000 series Product Overview page 987

Glossary
NAS protocols. Non-access stratum protocols. The protocols between UE and MSC or SGSN that are not terminated in
the UTRAN, and the protocols between UE and MME that are not terminated in the E-UTRAN.
NAT. Network Address Translation. Protocol defined in RFC-1631. Enables a LAN to use one set of IP addresses for
an internal traffic and another set of IP addresses for an external traffic.
NEBS. Network Equipment Building Standards. A rigid and extensive set of performance, quality, safety, electrical, and
environmental recommendations that are applicable to devices installed in a carrier's Central Office (CO).
NMS. Network Management System. Applications that provide overall management of all network elements. Defined
by the third tier of the TMN model of telecommunications management networks.
Nomadicity. The full range of network technology being designed to come to the assistance of the mobile (or nomadic)
computer user, not limited to network-layer protocols.
Non-GBR bearer. An EPS bearer that uses network resources that are not related to a Guaranteed Bit Rate (GBR)
value.
NPU. Network Processor Unit. A high-speed state-of-the-art processor customized for packet forwarding functions. See
Also NPU Manager.
NPU Manager. The NPU manager task provides NPU-related information to other software tasks and performs
recovery services for the NPU. An NPU manager task is started for each processing card in the system.
O
OMG. Object Management Group. The OMG is an open membership, not-for-profit consortium that produces and
maintains computer industry specifications for CORBA and other related protocols.
OSS. Operations Support System. Methods and procedures that support the daily operations of a carrier's network
infrastructure. This includes order processing, equipment assignment, and other administrative functions related to the
devices installed in the network.
OOB. Out-of-band Management. Out-of-band management is a method wherein management information exchanged
between the network element and its associated management application is carried on a separate communications path
from the user data that is coming to/from the network element. Conversely, in-band management is management data
that is carried across the same interface as user data.
P
PCF. Packet Control Function. A part of the 3G networking equipment that relays packet data and control signalling
between the BSC and the PCF. In some cases, the PCF may be integrated into the BSC.
P-CSCF. Proxy-CSCF is the first point of contact for the UE in the IMS network. The UE needs to establish a bearer
context using which the IMS signalling is carried by the UE with the P-CSCF.
P-CSCF Discovery. As part of the initial context establishment, the system may be required to select/discover a P-
CSCF to be used by the UE and send the selected P-CSCF information to the UE in the create response for that PDP
context. This procedure is called the P-CSCF discovery procedure.
PCU. Packet Control Unit. Typically a component in the BSS that connects to the BSC to an SGSN in the core network
of a GPRS/UMTS wireless network. Once the call is established, the PCU handles the packet data portion of a wireless
call.
PDIF. Packet Data Interworking Function. A security gateway providing secure voice and data over a WiFi network
via an IPSec tunnel.
PDN. Packet Data Network. Any packet-based data network, such as the Internet or an intranet, that a mobile
subscriber would attempt to access.
PDN address. an IP address assigned to the UE by the Packet Data Network Gateway (PDN GW).
PDN Connection. The association between a UE represented by one IPv4 address and/or one IPv6 prefix/address, and a
PDN represented by an APN.
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Environmental Information ▀
Cisco ASR 5000 Series Product Overview ▄