How do I connect to a CISCO router or any network element with a DB9 interface?

Each CDI flat RJ45-RJ45 cable also comes with an RJ45 to DB9F connector, The connector is pinned out to connect to any DTE type serial interface typically found on a PC type product. Use the flat RJ45-RJ45 cable and snap on the RJ45-DB9 adapter. If you see DTR on the CDI device when the cable is connected, odds are it is the correct cable.