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Label
Indication
System
OK
Power and
Operational
Status
ALM
Operational
Alarm (Fail)
TEST
Test Mode
Network
SIG
Signal
OOF
Out of Frame
ALM
Alarm
Port
TXD
Transmitted
Data
RXD
Received Data
RTS
Request to Send Green
DTR
Data Terminal
Ready
Color
What It Means
Green
ON – DSU/CSU has power and it is
operational.
OFF – System failed, or self-test in progress.
Red
ON – DSU/CSU has just been reset, or an
error or fault has been detected.
Yellow
ON – Loopback or test pattern is in progress.
OFF – No tests are active.
Green
ON – A recoverable signal is present on the
network interface.
OFF – The signal cannot be recovered from
the network interface.
Yellow
ON – At least one OOF was detected during
the sampling period.
OFF – No OOFs were detected during the
sampling period.
Yellow
ON – An alarm condition is present on the
network interface.
Green
ON – Receiving a 0 from the DTE.
OFF – Receiving a 1 from the DTE.
Green
ON – Sending a 0 to the DTE.
OFF – Sending a 1 to the DTE.
ON – DTE is activating a control signal to
indicate readiness to transmit data.
Green
ON – DTE is activating a control signal to
indicate readiness for operation.
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