Monitoring the DSU/CSU

6-5

7112-A2-GB20-20 March 1998
Port LEDs
TXD – Transmitted Data:
ON – Receiving a 0 from the DTE.
OFF – Receiving a 1 from the DTE.
RXD – Received Data:
ON – Sending a 0 to the DTE.
OFF – Sending a 1 to the DTE.
RTS – Request to Send:
ON – DTE is activating a control signal to
indicate readiness to transmit data.
CTS – Clear to Send:
ON – DSU/CSU is activating a control
signal to indicate to the DTE that
it can start sending data.
DTR – Data Terminal Ready:
ON – DTE is activating a control signal to
indicate readiness for operation.