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TXD-
Trasmit data LED (green) blinks to indicate data transi-
tions and remains OFF when no data is transmitted (idle).
RXD-
Received data LED (green) blinks to indicate data tran-
sitions and remains OFF when no data is received (idle).
CTRL-
Control LED (yellow)- turns ON at power up to indi-
cate to the DCE that the 2121 is active.
IND-
Indication LED (yellow) - turns ON when the 2121 is
ready to receive data from the DCE.
STAT-
Status LED (yellow) - Turns ON to indicate that a carri-
er detect signal is received from the DCE.
CLK-
Clock Signal LED (yellow) - blinks to indicate that the
transmit clock from the DCE is active. The CLK LED will
remain OFF to indicate the absence of the transmit clock.
PWR-
LED (green) turns ON as soon as power is applied to
the 2121/2135C.
Figure 9. Front of Model 2121, showing LED Indicators
TXD
RXD
CTRL
IND
STAT
CLK
PWR
Figure 10. Front of Model 2135C, showing LED Indicators
TXD-
Trasmit data LED (green) blinks to indicate data transi-
tions and remains OFF when no data is transmitted (idle).
RXD-
Received data LED (green) blinks to indicate data tran-
sitions and remains OFF when no data is received (idle).
DTR-
Data Terminal Ready LED (yellow)- turns ON at power
up to indicate to the DCE that the 2135C is active.
CTS-
Clear to Send LED (yellow) - turns ON when the 2135C
is ready to receive data from the DCE.
DCD-
Data Carrier Detect LED (yellow) - Turns ON to indi-
cate that a carrier detect signal is received from the DCE.
CLK-
Clock Signal LED (yellow) - blinks to indicate that the
transmit clock from the DCE is active. The CLK LED will
remain OFF to indicate the absence of the transmit clock.
PWR-
LED (green) turns ON as soon as power is applied to
the 2135C.