On 6/30/05, ronnie sahlberg <ronniesahlberg@xxxxxxxxx> wrote:
> On 6/29/05, Y Z <ommy_ss@xxxxxxxxx> wrote:
> > Hi all
> >
> > Sorry again folks for forgetting not everyone is on
> > broadband ;-). So many things on the mind :D
> >
> > Anyway, thanks Ron for input. If anyone knows any GPRS
> > provider with good latency let me know please.
>
> None do. they have to make it impossible to use low-latency services
> such as voip in order to not cannibalize on their revenue stream
> (circuit switch voice).
No, just calculate how much they charge per kbyte and you'll notice
that a voip call turns more expensive than a CS call. The actual
reason is a "natural" delay caused by a huge chain of nodes (each with
its own buffer).
2.5G:
PC -R- MS -Um- BTS -Abis- BSC -Gb- SGSN -Gn- GGSN -Gi- Internet
3G:
PC -R- UE -Uu- Node-B -IuB- RNC -IuPS- SGSN -Gn- GGSN -Gi- Internet
In the next(?) future mobile networks will do voice/video using the
packet interface (SIP,SDP,RTP,RTCP).
> As an unfortunate sideeffect of this it also means that anything
> interactive like telnet, or cifs filesharing (which is also latency
> bound) becomes so slow it is essentially useless.
>
> >
> > So is it a bug that ethereal hasn't reported the last
> > retransmitted packet?
>
> Yes, it is a mistake in the heuristics inside ethereal that mistakes
> the real retransmission as being just a network reordering of packets,
> aka out-of-order.
>
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