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 Releas e 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