Nortel INM 5.0 User Manual page 54

4-4 List of terms
OC-3
Optical Signal Carrier level 3 (155.520M bps); an optical carrier signal in the
SONET optical format which is three times the OC-1 rate (OC-1 is an STS-1
signal translated into an optical signal)
OC-48
Optical Signal Carrier level 48 (2.488 G bps); an optical carrier signal in the
SONET optical format which is 48 times the OC-1 rate (OC-1 is an STS-1
signal translated into an optical signal)
OPC
OPerations Controller
OSI
Open Systems Interconnection
OS
Operating System
PMBB
Performance Management Building Block
PM
performance monitoring
RMBB
Resource Management Building Block
S/DMS
Synchronous/Digital Multiplexing System
SDH
Synchronous Digital Hierarchy
SNMP
Simple Network Management Protocol
SONET
Synchronous Optical Network; a standard for optical transport formulated by
the Exchange Carriers Standards Association (ESCA) for the American
National Standards Institute (ANSI). The standard defines optical carrier (OC)
levels and their electrically equivalent synchronous transport signals (STS).
Integrated Network Management 450-3101-031 Rel 1.0 Standard June 1999