[j-nsp] M20 FPC throughput

Saku Ytti saku+juniper-nsp at ytti.fi
Mon Aug 15 03:21:38 EDT 2005

On (2005-08-15 06:33 +0000), The Drifter wrote:

> What is the forwarding capacity of a FPC in a M20?
> Is it 5Gbps, or 3.2 Gbps or 2.5 Gbps or 2.0 Gbps and any supporting 
> information/link will be indeed helpful

 It's exactly 4Gbps (32bit*125MHz). But J-CELL's overhead is "16/80 == 20%".
So that boils down to 4*0.2=0.8Gbps lost to J-CELLs, so 3.2 left for
packets, and this is packets, not frames, as L2 headers have been stripped
by now.

> Could anyone clarify the same for M160 and M320, please?


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