Cables
2. Line monitor (unidirectional)
25 pin D-Sub A to B
This cable can only monitor one direction. You can see what A (DTE) is sending to B (DCE). DTE is usually a computer and DCE is usually a modem. You will see what the computer is sending, but not the replies from the modem.
Cable to monitor what A (DTE) sends to B (DCE) for PC with 25 pin D-Sub.
25 pin D-Sub B to A
This cable will monitor the other direction. You can see what B (DCE) is sending to A (DTE). DTE is usually a computer and DCE is usually a modem. So you will be able to see the replies from the modem.
Cable to monitor what B (DCE) sends to A (DTE) for PC with 25 pin D-Sub.
9 pin D-Sub A to B
This cable can only monitor one direction. You can see what A (DTE) is sending to B (DCE). DTE is usually a computer and DCE is usually a modem. You will see what the computer is sending, but not the replies from the modem.
Cable to monitor what A (DTE) sends to B (DCE) for PC with 9 pin D-Sub.
9 pin D-Sub B to A
This cable will monitor the other direction. You can see what B (DCE) is sending to A (DTE). DTE is usually a computer and DCE is usually a modem. So you will be able to see the replies from the modem.
Cable to monitor what B (DCE) sends to A (DTE) for PC with 9 pin D-Sub.