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Glossary
CTS 710 SONET Test Set User Manual
Glossary–7
Through Mode
The ability to retransmit the incoming signal and manipulate its
contents.
TOH
An acronym for Transport Overhead.
Transport Overhead (TOH)
A set of bytes allocated within each frame to carry operation,
administration, and maintenance information from one end of
the system to the other.
Tributary
The lower rate signal that is input to a multiplexer for
combination (multiplexing) with other low rate signals to form a
higher rate signal.
Tx
An abbreviation for Transmit.
VT
An acronym for Virtual Tributary. A structure (not a signal)
designed for transport and switching of sub-STS payloads. The
sizes of VT currently in use are VT1.5, VT2, VT3, and VT6.
Yellow Signal
A code sent upstream to indicate that a failure condition has
been declared downstream.
Glossary
CTS 710 SONET Test Set User Manual
Glossary–7
Through Mode
The ability to retransmit the incoming signal and manipulate its
contents.
TOH
An acronym for Transport Overhead.
Transport Overhead (TOH)
A set of bytes allocated within each frame to carry operation,
administration, and maintenance information from one end of
the system to the other.
Tributary
The lower rate signal that is input to a multiplexer for
combination (multiplexing) with other low rate signals to form a
higher rate signal.
Tx
An abbreviation for Transmit.
VT
An acronym for Virtual Tributary. A structure (not a signal)
designed for transport and switching of sub-STS payloads. The
sizes of VT currently in use are VT1.5, VT2, VT3, and VT6.
Yellow Signal
A code sent upstream to indicate that a failure condition has
been declared downstream.