:-) I found DEC document EK-KCRSC-FS-001 "Remote Services Console: Field Service Manual." Sometimes I'm sure God is a computer collector. Connections: Connector Local Console Terminal A1 CPU Conole Port A2 Optional to Comm port B1 Connection to modem B2 Now the way it works is it can use the modem from an existing dial-in line which presumably the customer would already have. So where you would normally have: Console >-------------> Computer Modem >-----------==> Comm port You get +---+ Console >---+ R +------> console | S | Modem >----+ C +------> comm port +---+ This lets the modem be used to dial in the console or on the comm port when not remotely diagnosing issues. Buttons on the front control baud rate, the mapping is: out out out 300 in out out 1200 out in out 2400 out out in 4800 in in in 9600 Baud T is the terminal and should match the console port setting Baud M is the modem (1200 baud preferred :-) The various modes: REMOTE - modem can dial into the console. Light blinks when no one is dialed in REMOTE USER - modem is connected to the comm port USER PORT - all operation is transparent console and modem connect "straight through" to the other connector LOCKOUT - modem can't be used to get to the system. The dial in line uses the DDCMP protocol to insure data integrity. I'm not sure what this means in terms of being able to dial it from a PC. --Chuck