Monitoring the DSU

4-11

7510-A2-GB20-10 November 1997
Port LEDs
496-1506
2
CTS (106)
OK
ALARM
TEST
DM
OOS
OOF
NS
TXD (103)
RXD (104)
RTS (105)
DTR (108)
NetworkSystem Port
red green yellow
TXD – Transmitted Data:
ON – Receiving all 0s from the DTE.
OFF – Receiving all 1s from the DTE.
Blinking – User data is being transferred.
RXD – Received Data:
ON – Sending all 0s to the DTE.
OFF – Sending all 1s to the DTE.
Blinking – User data is being transferred.
RTS – Request to Send:
ON – DTE is activating a control signal to
indicate readiness to transmit data.
CTS – Clear to Send:
ON – DSU 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.