Alcatel-Lucent Data Multiplexer Explore 1665, Installation Manual, Page: 403 / 408

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Single 0x1 Cross-Connection
In a dual-homed application, the DMX 2.5G Multiplexer uses a single 0x1 cross-connection to map the
VT1.5 channels between the DDM-2000 FiberReach, OC-3 Multiplexer, or OC-12 Multiplexer and the
DMX 2.5G Multiplexer rings. This single 0x1 architecture maps low speed to high speed on a specified ring
rotation. The high speed to low speed drop is made on the same specified ring with no path switching.
Protection is provided at the VT1.5 end points.
Single Homing
A network topoly in which a single DDM-2000 FiberReach, OC-3 Multiplexer, or OC-12 Multiplexer
serves as a DMX 2.5G Multiplexer host supporting up to six OC-3 or OC-12 rings.
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.