Cisco ONS 15454 SDH Specifications Page 483

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Glossary
GL-21
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
SWS
SONET WAN switch.
SXC
SONET Cross Connect ASIC.
T
T1
T1 transmits DS-1-formatted data at 1.544 Mbps through the telephone-switching network using AMI or B8ZS coding. See
also AMI, B8ZS, and DS-1.
TAC
Technical Assistance Center.
Tag
Identification information, including a number plus other information.
TBOS
Telemetry Byte-Oriented Serial protocol.
TCA
Threshold Crossing Alert.
TCC+
Timing Communications and Control + Card
TCP/IP
Transmission Control Protocol/Internet Protocol
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.
TDS
Time-Division Switching.
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. See also AID.
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