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P
PXM
Q
Qbin
R
Routing Node
S
SNMP
U
UBR
Uplink back card
User interface back card
V
Virtual Switch Interface
VSI
VSI Controller
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Processor Switch Module. The processor card used in MGX 8850 series switches. The PXM is
the processor used in the MGX 8230 product. Although functionally equivalent to a PXM, the
PXM is not interchangeable with a PXM and will not fit in an MGX 8850 card slot.
A Qbin is a platform-specific (BXM in this case) instance of the more general Class of Service
Buffer (or CosB).
In tiered networks terminology, a Routing Node is a larger switch to which one or more feeders
or controllers are attached. The IGX switch serves as the routing node for an MGX 8230 feeder.
Simple Network Management Protocol.
Unspecified Bit Rate is a Class of Service for ATM networks defined by the ATM Forum.
Traffic in the UBR class is not guaranteed any particular throughput or delay performance. In
this regard, UBR is similar to "traditional" IP service.
The back card that mates with PXM and provides ATM trunking. The MGX 8230 supports only
an OC-3 uplink back card.
The back card (PXM-UI) that mates with the PXM and provides interfaces for control or
maintenance terminals, LAN connections, T1 or E1 clock inputs, and alarm outputs.
See VSI.
Virtual Switch Interface is a master/slave protocol that allows Cisco WAN switches, such as
the BPX 8600 series switch or the MGX 8850/8250 node, to be controlled by more than one
network application. MPLS, or AutoRoute are examples of network applications.
A controller, such as a Tag Switch Controller, which controls a switch using the VSI.
Cisco MGX 8230 Edge Concentrator Installation and Configuration
Glossary
GL-3
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