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Installation and commissioning of the modems and routers
5.8 ISDN dial-up modem MD4
5.8.1
Indicators and connectors accessible from the front
The following figure shows the front view of the MD4 modem with the front panels closed.
Figure 5-45
LED displays of the MD4
The following table summarizes the meaning and activity of the six LEDs on the front of the
modem for dial-up operation.
Table 5- 42
LED no.
1
2
218
Front view of the MD4 modem with the front panels closed
Meaning of the LEDs on the front of the MD4 for dial-up operation
Labeling
Description
TXD
Transmit data
The LED flashes in rhythm with the data flow sent to the modem by the
end device (TIM) over the RS-232 or RS-485 interface.
RXD
Receive data
The LED flashes in rhythm with the data flow sent to the end device
(TIM) by the modem over the RS-232 or RS-485 interface. The data flow
is indicated both in the data and in the command phase.
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
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