Hey all - a friend of mine uses a local ISP for ISDN (where DSL and Cable are not avail) and actually has two 128K Channels. Currently he is only using one and connecting at 115K. He asked me how to bind his two channels so he can get more speed. Are there any links you could point me to? My searches on Google have been pretty fruitless thus far. What kind of information to you need from me to help? I'm pretty sue he's using a 3Com IDSN modem on an NT4 workstation.

Thanks!

 

Commonly residential ISDN lines are comprised of two "B-channels," each w/ a max throughput of 64kb/sec for a grand total of 128kb/sec.

As some ISDN modems will allow you to use one of those channels for voice your effective bandwidth drops to 64kb/sec max.

My guess is that your friend was a bit misinformed when he signed up w/ his ISP. Not the answer you want to hear but I think everything is working normally. He might see a bit better throughput using an ISDN router that connects to your PC or home LAN via ethernet & TCP/IP rather than USB or serial.

Although there are other types of ISDN lines available the cost is prohibitive for most residential accounts.

 

that reported 115k is the bus speed to your serial port...tell him to download a large file and see the xfer rate.

 

Gregg - that's what I told him too, the 64K thing, but he said that he had two 128K's Is that even possible?

Josh- Good call on the port speed, I hadn't thought of that, I'l ask him to check the xfer rate

 

The only way to get 2 128k(4 x64k) channels is using a pri type isdn and that is very expensive.... not to mention if he is indeed hooking to a serial port, you would never get the use of that much throughput. I think he really has only 2 64k(bri) channels... I could make him a great deal on a kentrox isdn router (pipeline 85 clone with 4 ports, nat). His throughput would go up and he would be behind a nat'ed f/w ... meaning up to 32 devices(maybe more, would have to reread the manual) would have access to the internet.

 

Thanks for the help guys