4.3
SNM15
Use of the Modem
Digicom SpA
Warning Devices
PWR
(Power) green LED lamp, on indicates that that the
modem has been switched on.
C108
(Data Terminal ready) red LED lamp: ON indicates
that the DTE is connected.
C107
(Transmitted Data) red LED lamp: ON indicates that
there is data on the interface circuit C103, transmitted
data, therefore the flashes of the C103 LED warns of
the transmission of significant data.
C103
(Received Data) red LED lamp: ON indicates that
there is data on the interface circuit C104, received
data, therefore the flashing of C104 LED indicates
that siifant data are being received.
C109
(Data Carrier Detect) red LED lamp: ON indicates
that the receiver has correctly detected the data
carrier on line, this condition is then signaled to the
DTE, thus switching the C109 circuit ON and keeping
it in this position until the detection is over (Note 1).
C142
(Test) red LED lamp: ON indicates that an analogical
or digital loop is enabled (loop 2 or loop 3).
Note 1
: This criteria can be forced ON (ATRC0) if the DTE needs
this criteria to enable the communication.
