said by Doctor Olds:
Only some specific SDSL Router/Modems can perform "Back 2 Back" connections. It will usually require a dedicated run of copper no longer than 18,000 cable feet. It will likely not work by calling another person and trying to get the modems to connect over the phone call connection.
Some Back to Back capable SDSL Routers
• Netopia R7100-C SDSL Router
• Siemens/Efficient Speedstream 5851 SDSL Router
• 3Com OfficeConnect 840 SDSL Router
I see these are all SDSL modems. Does this mean that adsl does not work for back to back, or just that there are no back to back capable adsl modems that you know of?
Also, how much does your typical dedicated (without built in router) modem "do" besides simply modulating and demodulating the digital signal? Are they performing any handshaking, sanity- or error-checking besides that required for PPPoE (which is handled by the router)? Could I, for instance, send say, raw ethernet packets or even nonsense bits through one if I wanted to?
Thanks again, and for the prompt reply.