[c-nsp] Full Duplex

[Octavio Alvarez]

On 11/22/2014 11:43 AM, Mark Tinka wrote:
> On Saturday, November 22, 2014 02:16:23 AM Octavio Alvarez
> wrote:
>
>> If I found a vendor that did that, I would run away from
>> it for lying.
>
> But they all do that.
>
> What is more confusing is when vendors use half-duplex
> bandwidth to make a line card seem faster, e.g., a 30Gbps
> line card is sold as a 60Gbps if traffic flows in only one
> direction.

This is different.

A line card can support 60 Gbps of *processing power* if it can handle a 
full-duplex 30 Gbps interface because it has to process all the data at 
the same time in the worst case. This is correct. And so on: consider a 
two full-duplex 30 Gbps port line card: it would need the necessary 
power to handle 120 Gbps of data if you want it to not block or 
oversubscribe.

It's not the same as selling a full-duplex 30 Gbps link as a 60 Gbps 
link. This is incorrect.