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Glossary
GL-4
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
nm
nanometer
NNI
Network-to-network interface
O
OC
Optical Carrier
P
PE
PEM
Power entry module
PNNI
Private Network-to-Network Interface
POS
Packet over SONET
PPP
Point-to-point protocol
PSTN
Public switched telephone network
PXM
Processor switching module -- a double height front card. There are several types of PXM cards—The
PXM1 uses MGX Release 1.x software, the PXM45 uses MGX Release 2 and higher software and
includes models PXM45, PXM45/B, and PXM45/C, and the PXM1E uses MGX Release 3 and higher
software.
R
RBBN
Ribbon (cable)
RCON
Redundancy connector
RPM
Route processing module -- a double-height back card
RPM-PR
RPM-Premium Router
RPM-XF
RPM-Express Forwarding
RU
Rack unit—an industry standard unit of measurement. One RU is equal to 1.75 inches (4.45 cm).
Rx
Receive
S
SES
Service Expansion Shelf