Maintenance and Troubleshooting
5-4
9621-A2-GB20-30
August 1997
DTE Port 1 or 2
Label
Indication
Color
What It Means
P1/ P2
Port 1/ Port 2
Green
ON –
Port 1 is being monitored.
OFF –
Port 2 is being monitored.
TXD
Transmitted
Data
Green
ON –
Data sent from the DTE over
interchange circuit BA (ITU 103) is
all 1’s.
OFF –
Data sent from the DTE over
interchange circuit BA (ITU 103) is
all 0’s.
Blinking ON and OFF ( Rate: 5 Hz ) –
Both 1’s and 0’s are being received
from
the DTE; circuit state has
changed at least once during the
sampling interval.
RXD
Received Data
Green
ON –
Data received by the DTE over
interchange circuit BB (ITU 104) is
all 1’s.
OFF –
Data received by the DTE over
interchange circuit BB (ITU 104) is
all 0’s.
Blinking ON and OFF ( Rate: 5 Hz ) –
Both 1’s and 0’s are being received
from the DTE; circuit state has
changed at least once during the
sampling interval.
DTR
DTE or Data
Terminal Ready
Green
ON –
DTE is sending a control signal over
interchange circuit CD (ITU 108) to
indicate it is ready to transmit data.
OFF –
DTE has stopped sending the control
signal over interchange circuit CD
(ITU 108).
CTS
Clear to Send
Green
ON –
DCE is sending a control signal over
interchange circuit CB (ITU 106) to
indicate it is ready to transmit or
receive data.
OFF –
DCE has stopped sending the control
signal over interchange circuit CB
(ITU 106).