[cisco-voip] Funny docs

[Wes Sisk]

You might be surprised.  I was involved with an early VOIP adopter who 
placed CM servers in Minnesota and h.323 gateways in Zurich, 
Switzerland.  Take the number of packets required to negotiate and open 
logical channels in H.323, multiply that by the round trip time, and you 
get an unacceptable user experience.  MGCP and H323 
fastconnect/faststart offer some improvement but all still produce 
perceptible delay over that much RTT.  Simply no way to ovecome N 
Packets x RTT.  Morse Code / two way radio / ham radio / cell phones 
'work' but G.722/Wideband/Lossless also 'work'.  Difference = 
expectation/perception.

/Wes

Robert Kulagowski wrote:
> Someone has a dry sense of humor.  Last sentence.
>
> Telepresence SRND, pg 40:
>
> Nonetheless, the network flight-time budget of 150 ms allows for nearly 
> 24,000 km or 15,000 miles worth of propagation delay (which is 
> approximately 60% of the earth’s circumference); the theoretical 
> worst-case scenario (exactly half of the earth’s circumference) would 
> require only 126 ms. Therefore, this latency target should be achievable 
> for virtually any two locations on the planet, given relatively direct 
> transmission paths. However, for some of the more extreme scenarios, 
> user expectations may have to be set accordingly, as there is little a 
> network administrator can do about increasing the speed of light.
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