Glossary
Terms and Definitions
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Lucent Technologies - Proprietary
See notice on first page
365-372-327 R2.0
Issue 1, October 2003
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Standby
Standby identifies a 1+1 protected OC-N line which is not currently selected
by the receiver at either end as the payload carrying signal, or 1x1 or 1xN
protected circuit pack that is not currently carrying service. See Active.
Status
The indication of a short-term change in the system.
STS, STS-n - Synchronous Transport Signal
The basic building block signal with a rate of 51.840 Mb/s for an STS-1 signal
and a rate of n times 51.840 Mb/s for an STS-n signal.
STS-1 SPE - STS-1 Synchronous Payload Envelope
A 125-microsecond frame structure composed of STS path overhead and the
STS-1 payload.
STS-3c
Synchronous Transport Level 3 Concatenated Signal. See OC-3c.
Subnetwork
Group of SONET network elements that share a SONET data communications
channel.
Synchronization Messaging
SONET synchronization messaging is used to communicate the quality of
network timing, internal timing status, and timing states throughout a
subnetwork.
SYSCTL - System Controller
The system controller circuit pack that provides overall administrative control
of the terminal.
T
T1X1 and T1M1
The ANSI committees responsible for telecommunications standards.
TCA - Threshold Crossing Alert
A condition set when a performance monitoring counter exceeds a user-
selected threshold. A TCA does not generate an alarm but is available on
demand through the CIT and causes a message to be sent to NMA via the X.25/
TL1 interface.
TL1 - Transaction Language 1
A Telcordia Technologies machine-to-machine communications language that
is a subset of ITU-TSS, formerly CCITT’s, human-machine language.