said by RizzleQ:
Cable: No, but distance doesn't really matter for cable
DSL: Can try asking TSI to search your postal code for an existing account and they can use the attenuation on their line to make a rough estimation
Technically, it still does. The longer the cable, the stronger the signal degradation is. And coaxial cable has a shielding all the way to the modem.
Also take a look at this bell-telephone-madness. All those wires are telephone wires. The crosstalk rate must be crazy.
Sorry about the quality.