Manual for Speedrunner 202 by Netspeed

I have some Speedrunner 202 ADSL modems built by Netspeed of Austin Texas. Netspeed was bought up by Cisco, but I can’t find anything there.

Does anyone have a manual or instructions.

I have tried in vein to connect to what I suspect is a DB9 serial connection on the back labelled “management”, and would welcome any specific information on how to connect. (cable schematic/pin-out diagram)