Alcatel-Lucent 1665 Installation Manual page 362

Terms and definitions
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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.
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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.
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U
UAS - Unavailable Seconds
In performance monitoring, the count of seconds in which a signal is declared failed or, in which,
10 consecutively severely errored seconds (SES) occurred, until the time when 10 consecutive non-
SES occur.
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GL - 2 6
Alcatel-Lucent 1665 DMXtend R10.0
365-372-327R10.0 Issue 1
January 2013