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Helmholz Modem 56k small/Modem 56k USB small
4
Initial Operation
4.1
Front panel
HELMHOLZ Modem 56k small
HELMHOLZ Modem 56k USB small
The HELMHOLZ Modem 56k small INT has two LEDs to indicate the operating state:
The left LED (Power RX/TX) displays the condition of the operating voltage and a data
transmission. The right LED (OH/DCD) displays the status OH (off hook) and DCD (data car-
rier detect). The exact meaning of the display elements is described in the following table.
State
Left LED
Right LED
LED off
No operating voltage applied.
The modem is not “off hook” (it has not
yet “lifted the receiver”).
LED is green
Operating voltage applied.
The modem is hooked to the phone line
(it has “lifted the receiver”); a connec-
tions has not yet been established.
LED is or blinks or-
ange
Data is transmitted.
The connection to the remote terminal
is established, the carrier was detected
If the DCD line at the modem is
permanently switched on, it cannot
be distinguished, whether a connec-
tion to the remote terminal is active
or not.
LED is red
The modem is not “off hook” (it has not
“lifted the receiver” yet) and the DCD
line at the modem is permanently
switched on.
Systeme Helmholz
Systeme Helmholz
Summary of Contents for Modem 56k small
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