Protected
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Protected

About Protected Capacity

This product provides fully protected capacity on a single cable station to single cable station basis.

Protected Capacity is a transport unit inclusive of the in-built self-restoration provided by the network. The network protection mechanism is compliant with ITU-T G.841. SCCN Protected Capacity is provided using the SNC-P protection mechanism.

Capacity Options

Unit Size:

Gross Megabit/s:

Comments:

STM-4

622

Structured or Concatenated

STM-16

2,488

Structured or Concatenated

STM-64

10,000

Structured or Concatenated

Protected Capacity can be assigned on any Traffic Path.
Reassignment of Protected Capacity to other products and Traffic Paths is allowed.
Network interface is protected.
Switching time on Protected capacity during failure is a maximum of 50 ms.
Service Activation cable station to cable station within 48 hrs.

Revertive Switching on Protected Capacity

The standard configuration for Protected Capacity on the Southern Cross Network is non-revertive switching. This means that when a fault is detected, the path will automatically switch from the Main (Working) Path to its Protect (Standby) within a 50 ms period. The circuit will stay in this configuration until either manually switched back or a fault situation causes another switch. This is normally satisfactory on the Southern Cross Network, where both Main and Protect paths are similar lengths, and thus there is little difference in latency. There is one situation, however, where the paths are unequal lengths and the difference in latency is quite evident. In this case the shortest path is given priority and if a fault develops on the Main Path, which is the shortest path, the circuit will switch to the longer Protect Path, but if the Main Path remains fault free for a continuous five minute period, the circuit will automatically switch back to the Main Path. However, if during the 5 minute period following the switch to the protect path a further problem is experienced on the main path, the timer counting the restore period resets and the 5 minute period starts again. If the main path does not remain fault free for the 5 minute timer period the circuit will not switch back to its main path.

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DID YOU KNOW?

Our network has 462 optical repeaters under the sea and each one cost more than a half million dollars.

Within 2 years Southern Cross is expected to have the potential to increase its total protected capacity to at least 1.2 Tbit/s using 100 Gbps technology that is already being tested for submarine cable systems.

1,500 km of our cable is actually buried in the ocean floor.