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[PWE3] Need clarification on Extended NxDS0 with CAS - RFC 5086

Hi All,

 

 I have some doubts on Extended NxDS0 CAS mode setup. I have listed them below.

 

a.       Does the packet latency specified for Basic NxDS0 holds good for Extended NxDS0 mode with CAS. Because, when we say CAS, are we not trunk-specific.

b.       When ever we need CAS, the TDM interface should be in multi frame mode. It can be 16 frames or 24 frames based on E1 or T1 interface. But if we configure for 1 ms packet latency then we are required to send data for each 8 frames as payload. But CAS retrieval aligns to SF number of frames (16 or 24). Does this mean, do we need to send previously stored CAS state.

c.       My second doubt is on two pseudowires. One for CAS and one for data. How does the user see this. For example, Does single configuration to enable two pseudowires is required or separate configuration for two pseudowires is recommended. In the later case, though they are configured in sequence for CAS pseudowire and data pseudowire, do we need to enable them at same time. Can signaling PW become active first and data PW after some time.

 

Regards,

Mahesh

 

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