I have some pretty lousy aDSL with a lousy vendor and we're trying to deploy VoIP phones.
We average 50-60 ms latency, but see spikes of 300-600ms.
You can imagine what those spikes do to the conversation on a VoIP phone.
I've tested the latency when there was absolutley no other traffic on the network and found the same spikes. THis is definitely our ISP causing the spikes.
I've been in contact with another vendor, AT&T.
3.0Mb/512kb aDSL (cheaper)
384kb sDSL (slightly more expensive)
AT&T boasts a 28ms average, and offers a 40ms guaranteed average, but this is an average.
My question is, will the sDSL provide better latency? Will sDSL provide better performance and less latency spikes than the aDSL?
My second question is, am I asking for continuing problems? Should I just bite the bullet and get an internet T-1?
I've read several articles that indicate that sDSL is better for applications such as VoIP, but these articles are pretty dated and reference aDSL speeds that are much lower than todays aDSL up speeds.