potential of the ALUM signal from the CBMOD). This results in the following conditions:
- The lines to the line trunk module and subscriber line module are split and the trunk is
connected directly to the subscriber line.
The activation of the ALUM relay is prevented (by an optocoupler) if the power supply voltage
returns after an interruption and a trunk call is in progress.
Relay data
Electrical characteristics of the relays:
- Operating voltage: 12 V DC
- PFT power consumption: 40 mA at 12 V nominal voltage
- Power consumption per relay: 20 mA at 12 V nominal voltage
- PFT contact load: 60 mA at - 60 V nominal voltage
- Max. PFT contact load with atmospheric influence: 8 A
- Contact load for relays K1 - K4: 1 A at 250 V AC
Maximum power consumption - 48 VF: 80 mA
Installation location of the REAL board (backplane)
The REAL board (basic cabinet only) is connected to the backplane by means of a ribbon cable (X05)
and to the MDFU/MDFU-E by means of an SU cable connector X06.
Figure 3-60 Installation location for REAL (backplane of the basic cabinet)
Relay contacts of the REAL board
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