Many thanks to the B*Cat, I now have an unlocked ECI modem
(Simply used Putty in a WinXP VM I have for such things on my MacBook).
Some of you may be aware of my current setup - the modem and router are located in separate rooms, with just one cable linking the two. Not good when you're attempting to get stats... or even web gui access!
But, also playing around with the ECI modem, I dug out an old gigabit switch. So I've connected the feed from the modem, and also hooked it upto the router. Router still has access to the net, along with all other devices (as you'd expect). What I did find interesting though, is if I hook another patch lead into the switch and connect that to my laptop. If I correctly set a static IP address, I can also access the web gui of the ECI this way - whilst all other devices in the house still have access to the net!
I never actually tried this setup with the HG612, but I know that refused all access to the web gui from LAN1. When I unlocked the ECI, I could access the gui from LAN1 or LAN2 - so maybe this is something specific to the ECI?
Anyway... just because I can... I'd estimate my E side is around 350m:
Channel Status Upstream Downstream
Actual Net Data Rate 20000000 kbps 78308000 kbps
Actual Interleave Delay 0 ms 0 ms
Actual INP 0 Symbols 0 Symbols
Attainable Net Data Rate 27444204 kbps 78355520 kbps
Transmit Power 138 dBm 50 dBm