Since my previous post, I re-read your post for better understanding. I think I get it but let me make sure.
From the Cable Modem to SR-200's WAN port, connect both with a Ethernet cable.
OK, I think she has those connected that way. (I'm not at her house, so I can't see it right now; I'm trying to do this by memory.)
SR-200 Router only have ethernet port and it has no USB port.
Correct.
You can't have both ethernet cable and USB cable connected to the cable modem at the same time. If you are to use the SR-200 then remove the USB Cable.
So that means disconnecting the PC CPU from the SR-200, correct?
From SR-200
Port 1 connect ethernet cable to CPU
Ah, here's the problem. Comcast told Deaf client that USB was the
only way she could connect unless she bought a new computer; USB was the "affordable" option.
Let me back up. All these changes happened after lightning hit her apt. Comcast replaced her modem but told her she had to either replace her CPU or use the USB.
A similar thing happened to me a couple years ago. Lighting hit my house and knocked out the internet. However, I have RoadRunner cable service, and they handled the situation differently. They replaced (for free) my modem AND the Ethernet
inside my CPU.
Port 2 connect ethernet cable to VP-100/200
The Sorenson tech connected her VP-100 to Port 4. Light #4 on her SR-200 lights up when the VP is on.
Port 3 - empty can be used to connect to other CPU (ethernet)
Port 3 currently has the USB cable to the CPU. The #3 light comes on when she uses the internet on that PC.
Port 4 - empty can be used to connect to other CPU (ethernet)
Ports 1 and 2 are empty on her SR-200. When I was at her house, I tried to connect my laptop thru her empty ports. When I plugged in, she lost all internet connections. I disconnected my laptop, then we had to unplug, and then plug in again, all connections to get the internet back.
If you are to use USB cable then you can't use SR-200 so that means you connect USB cable from Cable Modem to CPU.
But is there only one connection from the Comcast Modem? If there is only one, then she has to choose
either using it for PC's USB cable
or SR-200, right? If that's true, then how does the SR-200 work?
VP-100/200 must be set to the DMZ address (192 . 168 . 0 . 125) while other CPU are set to DHCP
Are those settings for use if connected thru the SR-200, or for direct modem connections?