Fred A. Miller wrote:
James Knott wrote:
[snip]
BTW, I've worked in telecom for much of the past 37 years and I have run many systems, over copper & fibre. Incidentally, most of the phone system runs over fibre.
Yes, I know that, but Time Warner was INSISTED that it won't work on their digital cable service. I spent a couple of hours trying to get it to work before calling T.W. tech. support. I went "up the ladder" and they all said the same thing, claiming that the modem is analog and therefore won't work. This is NOT an area I have much expertise, Jim, so you obviously know what's going on. Why won't it work?! The modem they furnish is a Touchstone Telephony, FYI.
Fred
Well, it is an area where I have a fair bit of experience and if they told me that, I'd tell them they were full of it. I'd never heard of that brand so I did a Google search. I don't know if this is your model, but I came up with some info on the TM502G: http://www.arrisi.com/product_catalog/listers/index.asp?id=385. According to the specs, it support T.38 FAX: http://en.wikipedia.org/wiki/T.38_Fax . So it would appear TW is shoveling it. It's more likely they're using compression etc., to minimize bandwidth requirements and in the process clobbering modem signals. According to the specs, your terminal supports G.711, which is good, but it also supports G.729, which is bad for modems etc. If TW uses other than G.711 you will have problems. Other issues include jitter, which can be corrected with buffers or lost packets. Modern modems can sustain some lost data without significant effect, as they use error detection/correction. G.711 uses the full 64 Kb/s for the call. G.729, only 8 Kb/s, which will not support a modem call. That terminal also supports G.726 which, depending on compression level, may support a modem. So the bottom line is it depends on how TW has configured the service. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org