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It’s a way of protecting traffic in links by assign one protection channel for multiple main channels
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For example of we talk about 3+1 , it means we have 3 main channels carry traffic and 1 protection channel
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Protection channel can carry the traffic in Case of any failure happened at any main channel
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In some other cases we can use the standby channel for low priority traffic to utilize the Link capacity
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But in this case , if one of the highest priority channels become down ( main ) , it’s traffic should be switched to the standby and the low priority traffic will be dropped
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We have 2 modes of protection :
- Revertive
- Non revertive
Another type of protection called 1+1
In this type , every main channel has its own dedicated standby channel
This is not always be a good solution from the resources utilization point of view
But from the reliability and availability point of view it’s better than N+1
- Also we have multiple other types of protection :
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SNCP
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MSP
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