[c-nsp] Packet Latency Calculator

[Matthew Crocker]

Hello,

   Every once and a while I have a customer complain about latency  
through our network.  Normally it is on the initial hop (DSL).  Does  
anyone know of a calculator I can use to figure the theoretical  
minimum latency for a circuit?

For example:

Customer traceroutes through to their gaming server (15 hops away).   
They see 30ms ping times on the first hop (DSL Line).  The DSL line  
is IP over PPP over Ethernet over ATM over DSL.  With all the extra  
encapsulation and the ATM cell tax how big is the new packet?  How  
long would it take to send/recieve this packet over a 768kbps DSL link?

Anyone know a good place to look?

-Matt