Specifications

Glossary
GL-5
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Routing Node
In tiered networks terminology, a Routing Node is a larger switch to which one or more Feeders is
attached.
RPM
Route Processor Module. Also refers to the RPM card that is designed for MGX 8230, MGX 8250, and
MGX 8850 Release 1 switches. The RPM card is an Ethernet router that can operate as a Label Edge
Router or a Label Switch Controller in an MPLS network.
RPM-PR
Newer version for the RPM card that is designed for MGX 8850 and MGX 8950 switches.
rtVBR
Real-time-variable-bit-rate is intended for real-time applications that require tightly constrained delay
and delay variation (such as voice and video applications). rtVBR is characterized by PCR, SCR, and
MBS.
S
Service Class (aka
Service Type, or
Service Category)
A concept for grouping connections that share a common set of traffic characteristics and QoS
requirements.
Service Class
database
The collection of data items which support the Service Class Template concept.
Service Class
Template (SCT)
A set of data structures which map ATM Service Types to sets of pre-configured communication
parameters.
SCR
Sustainable Cell Rate.
SNMP
Simple Network Management Protocol.
SVC
Switched Virtual Circuit.
SPVC
Soft Permanent Virtual Circuit.
SPVP
Soft Permanent Virtual Path.
T
TAC
Technical Assistance Center.
U
UBR
Unspecified Bit Rate is intended for non-real-time application, such as those that do not require tightly
constrained delay and delay variation. Traffic in the UBR class is not guaranteed any particular
throughput or delay performance. In this regard, UBR is similar to ‘traditional’ IP service.
UNI
User-to-Network Interface.