OC-1: Optical Carrier - 1; SONETCarrier 44.5 Mb/s
OC-3: Optical Carrier - 3; SONETCarrier 155 Mb/s
OC-9: Optical Carrier - 9; SONETCarrier 466.56 Mb/s
OC-12: Optical Carrier - 12; SONETCarrier 622.08 Mb/s
OC-18: Optical Carrier - 18; SONETCarrier 933.12 Mb/s
OC-24: Optical Carrier - 24; SONETCarrier 1244.16 Mb/s
OC-36: Optical Carrier - 36; SONETCarrier 1866.24 Mb/s
OC-48: Optical Carrier - 48; SONETCarrier 2488.32 Mb/s
ODA: Open Document Architecture
ODBC: Open DataBase Connect; a method of connectinga database to the Web
ODIF: Open Document Interchange Format
ODT: Open Desktop, (SCO)
OEM: Original Equipment Manufacturer
OFDM: Orthogonal Frequency Division Multiplexing
OLE: Object Liking and Embedding
OMG: Object Management Group
OMM: Operation and Maintenance Module
ONC: Open Network Computing, (SUNMicrosystems RPCArchitecture)
ONE: Open Network Environment, (Netscape)
ONMA: Open Network Management Architecture;IBM's network management architecture comprised of EntryPoints, Service Points and Focal Points - implemented as NetView.
ONU: Optical Network Unit; A form of AccessNode that converts optical signals transmitted via fiber to electricalsignals that can be transmitted via coaxial cable or twisted pair copperwiring to individual subscribers.
OOB: Out of Band
ORB: Object Request Broker, (OMG)
OSF: Open Software Foundation; an organizationformed to compete with Sun Microsystems, for domination of the varied unixmarket.
OSP: Outside Plant; provides the 'last mile'traditional telephone service.
OSPF: Open Shortest Path First; (RFC2178) A link state routing protocol, as opposed to a distance vectorrouting protocol. It is one of the Internet standard Interior Gateway Protocolsdefined in RFC 1247. A routing protocol such as OSPF, permits routers to exchange informationwith one another about the reachability of other networks and the costor metric to reach the other networks.
The cost/metric is based on number of hops, link speeds, traffic congestion,and other factors as determined by the network
designer. Link state routers use Dijkstra's algorithm, (EdskerDijkstra) to calculate shortest (lowest cost) paths, and normallyupdate other routers with whom they are connected only when their own routingtables change.
Link state routing is an improvement over distance-vector routing protocolssuch as RIP which normally use only a single metric
(such as hop count) and which exchange all of their table informationwith all other routers on a regular schedule. Link state
routing normally requires more processing but less transmission overhead.
OSS: Operations Support System
OSSI: Operations Support Systems Interface
OTM: Optical Transponder Module