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SONET
SONET
The Synchronous Optical Network (SONET) is the transport standard for transmitting data over
fiber-optic cable. It supports data rates in the gigabit range, optical interfaces, network
management, and diagnostic testing methods.
SONET comprises four layers, as described in the following table:
Layer
Description
Medium
The physical layer, in which electrical and optical signals are transported across SONET
cable. This is the lowest SONET layer.
Section
Governs communication between SONET network elements, such as regenerators. This
layer handles framing, scrambling, and error monitoring.
Line
Establishes communication between SONET line terminating equipment where SONET
signals are multiplexed or demultiplexed. This layer handles data transmission through
synchronization, multiplexing, and other data transport functions.
Path
Terminates point-to-point communications. This layer handles transport of services
through the entire network. This is the highest SONET layer.
R
EDUNDANCY
Redundancy is a feature of the Avidia system. Redundancy includes:
•
dual homing, which provides redundancy at a VPC or VCC level (dual homing also
provides static load sharing) as described on
•
card redundancy, where a primary line card can switch to a secondary line card if the
primary card were to fail as described on
•
Automatic Protection Switching (APS) for the OC3 line card with dual-PHY connectors,
where the primary physical port switches to the secondary physical port if the primary port
were to fail as described on
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Avidia System Configuration and Management User Manual
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