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After I switched from AT&T hardline phone (PSTN) to iTalkBB Internet phone (VOIP) service, my same voice phone works just fine while my same fax machine does not. My Internet Service Provider (ISP) is Road Runner – a Time Warner Cable division. They give me a Motorola cable modem with one Ethernet port (RJ45) which I used for my D-Link router. All my two computers and two VOIP boxes, one for phone and one for fax with different phone number, are behind the router.

According to my VOIP provider’s advice, I’ve tried to slow down transmission speed (on fax machine) from the default 33.6 (mbps) to 9600 baud and turned off ECM. So far I can send out faxes to some numbers but not all numbers, and could not receive any fax including the very fax machine that received my fax.

My VOIP provider then suggested me to hook up the VOIP box directly to the cable modem so it has its own internet connection. I tried that by taking off the router from the cable modem and just plug in the fax VOIP box to the cable modem. It dose not work – did not even get the dial tong – either with regular patch cable or a crossover cable. Time Warner Cable told me that they do have two port cable modem but only give to me when I subscript to their digital phone (VOIP). However, their price is 8 times higher than iTalkBB ($40 vs $5 per month). I tried to find a cable modem with more than one Ethernet port. I could not find any in three major electronic stores as Best Buy, Circuit City, and Micro Center.

I am now thinking to roll back my fax line to AT&T for a basic plan cost $15+tax=$20 per month. That way I will be sure it works – it’s a hardline.

Somebody on Iinternet advised me to wait for the undergoing Fax Over Internet Protocol (FOIP). But I don’t know where this baby is – if any. On the other side of the story, somebody on Internet stated that he switched to VOIP, and his fax machine works flawlessly ever since for a year so far. My line condition is no comparison to his, but I did make some improvement – half way so far.

Is there anybody has a clue or suggestions please help me out. Many thanks!

yea just like this , thats what pstn stand for , thx

See our entire index of CompTIA Network+ videos at www.FreeNetworkPlus.com – Packet switched WAN networks are the latest technologies in wide area communication. In this video, you’ll learn about ATM, ADSL, MPLS, cable modem, and many more packet switched technologies.

I cannot connect to the internet on my new Comcast Internet. I still can on my DSL, using the same router.

*** I CAN connect using a single PC connected to the Comcast Modem.***

I still have both DLS and Comcast. I switched to Comcast and I configured my D-Link wireless router. The status shows connected on Dynamic DHCP with the router address being something like 68.168.87….. so I know it is not local. I then see that the Wireless LAN addresses are the local ones, 192.168.0.##

And I have both a Wired desktop and a Wireless laptop connected. But I cannot connect to the Internet.

I checked my TCPIP settings but it looks normal. If I plug the router back to the DSL and re-configure it, that works fine.

So what am I missing. Is the local IP addresses too high? I read somewhere that Comcast like to keep the Address scope to just 5 spots all under 99. I will have to try that later when I get home…

Any clues will be helpful

Thanks

I know that’s a silly question, but it’s a bit of discussion here in our office. Obiviously, after it get’s to your provider, it’s switched (i.e. Frame Relay and the such). But what about the final connection from a DSLAM or an RT? Is that last portion of it considered a Packet Switched Network?