Specifications

Glossary

GL-12

Cisco ONS 15454 Installation and Operations Guide, R3.2

March 2002

Tag

Identification information, including a number plus other information.

TDM

Time Division Multiplexing. Allocates bandwidth on a single wire for information from multiple channels based on

preassigned time slots. Bandwidth is allocated to each channel regardless of whether the station has data to transmit.

Telcordia

Telcordia Technologies, Inc., formerly named Bellcore. Eighty percent of the U.S. telecommunications network depends on

software invented, developed, implemented, or maintained by Telcordia.

TID

Target Identifier. Identifies the particular network element (in this case, the ONS 15454) where each TL1 command is directed.

The TID is a unique name given to each system at installation.

TLS

Transparent LAN Service. Provides private network service across a SONET backbone.

Transponder

Optional devices of a DWDM system providing the conversion of one optical wavelength to a precision narrow band

wavelength.

Trap

Message sent by an SNMP agent to an NMS (CTM), console, or terminal to indicate the occurrence of a significant event, such

as an exceeded threshold.

Tributary

The lower-rate signal directed into a multiplexer for combination (multiplexing) with other low rate signals to form an

aggregate higher rate level.

Trunk

Network traffic travels across this physical and logical connection between two switches. A backbone is composed of a number

of trunks. See also Backbone.

Tunneling

Architecture that is designed to provide the services necessary to implement any standard point-to-point encapsulation scheme.