Glossary
Issue 3 June 2000
GL-19
SONET
Synchronous Optical Network
SPE
Synchronous Payload Envelope
SPOTS
Super POTS
SQU
Sync Quality Unknown. Used in synchronization messaging.
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 carry-
ing service. (See Active.)
Star Topology
For DDM-2000 FiberReach, this refers to a configuration of multiple point-to-point OC-1 extensions
from a single DDM-2000 OC-3/OC-12 Multiplexer.
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 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
The system controller circuit pack that provides overall administrative control of the terminal.
T
T1EXT
T1 Carrier Extension Circuit Pack
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