GL-18 Issue 5 June 2000
363-206-208
Glossary
SPE
Synchronous Payload Envelope.
SPE STS-1
Synchronous Payload Envelope — A 125-microsecond frame structure composed of
STS path overhead and the STS-1 payload.
SRD
Software Release Description.
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 a 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 logical 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
The basic logical building block signal with a rate of 51.840 Mb/s.
STS-3c
Synchronous Transport Level 3 concatenated Signal. See OC-3c.
Subnetwork
A subnetwork consists of a CO (or Gateway Network Element), DDM-2000, and all
remote DDM-2000s connected via SONET DCC that are enabled.
Synchronization Messaging
SONET synchronization messaging is used to output DS1 AIS when clock traceability is
lost.
SYSCTL
The system controller circuit pack that provides overall administrative control of the ter-
minal.
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