[c-nsp] latency measurement equipment

[Jeff Bacon]

> From: Saku Ytti <saku at ytti.fi>
> 
> What kind of resolution are you looking for? If you're looking less
than
> nanosecond precision things might get complicated, but for tens of
nanoseconds,
> should be easy.

I'd settle for 1 micro. nanoseconds is a bit much especially with
gigabit gear. 

> Also maybe worth to consinder to rent the gear, if it is one-off need,
as your
> budget is bit tight for spirent/smartbits, ixia/agilent, it might fit
anritsu
> though.

budget is flexible, considering. I don't really need too all much, a few
ports will do, I just want better accuracy than I'm going to get with
tcpdump/wireshark and comparing packets and semi-wandering timestamps.