MacLeech
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join:2001-07-14
SoCal
2 edits | Re: YOUR WRONG said by ftth_freak  : Cable Co's like Comcast, Time Warner, Charter, Cox and others use an entirely separate CMTS and separate return and forward signal than their cable modem system. Cable co's COULD do that, but the most don't.
Most setup separate service flows over the same upstream/downstream channels the cable modems use. Phone services are given higher priority and guaranteed bandwidth so general internet use doesn't impact phone service.
If the cable companies were using separate CMTSs or even just separate upstream/downstream channels they couldn't provision eMTAs to allow for both internet access and phone service from the same unit as current DOCSIS 1 and 2 modems can't tune to more than 1 upstream and 1 downstream channel at a time.
Companies that REQUIRE seperate phone and internet modems may be using separate channels or CMTSs but that's pretty rare.
The nice thing about cable co's VOIP implementations is that they DON'T route voice traffic over the internet like 3rd party VOIP providers HAVE to. Cable can keep the traffic on their own private network (on it's own VLAN) until they hand it off to PSTN providers if needed for an off-net call. Some cable providers also have agreements and links with others so they can directly hand off traffic to each other without 3rd party network involvement. If both ends of the call are on cable VOIP, the call traffic may not even leave the cable providers' networks.
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