I am asked to consider deploying asterisk servers as soft-switches on a large scale, but wanted to preserve TDM properties of a call, especially for modem applications which some of the end users may want. I was thinking TDMoE may work well for this, at least on the surafce but had specific questions regarding modem data on the call.
As most of you are aware a TDM network virtually guarantees that the data that enters the network comes out at the same cadence that it went in. Modems like this near exact timing. IP networks have no such guarantee so modems tend to not want to work well when VoIP protocols are used. Compression methods (codecs) used in VoIP can also distort the data for a modem call, as such they are undesirable. The usage that I am considering would be to have soft switches placed in stragetic locations throughout a large geographic area but be able to provide service to customers, which can include modem usage (think large phone company selling arbitrary phone lines to be used however the customer sees fit). As such I need modems to be able to work over this network. I had considered linking all the remote sites together via TDMoE (private network primarily using dark fiber). Does TDMoE provide effectively the same capacity to preserve modem data (upto and including "56k" speeds) as a T1 would? Or would I need to actually transmit voice channels on T1/DS3/whatever framed circuits using the Zap interface? Has anyone tried TDMoE on longer runs, or at all with modem data? -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378
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