RCF RX 4000, Service Manual, Page: 44 / 87

SERVICE MANUAL SYSTEM RX 4000
January 2009 Version 1.9 Page 44 di 87
3.6 End of line Module
‘END OF LINE’ modules are always to be inserted when there are audio signal links from
CP4100 to external devices (i.e. amplifiers).
The RX4000 system sends on its outputs (where EOL modules are present) a 22 kHz control
tone that the SLIM board can detect, while the SPE057 circuit removes the control tone in order
to avoid any interference with RCF RB 3300 + SB 3320 diagnosis boards.
Cable between the CP 4100 control unit and every EOL module:
- A twisted and screened pair for the audio signal
- A pair for diagnosis and fault detection
- A pair for 24 V dc power supply.
The connection can be made through CAT5 cable.
When it is possible to power a EOL module locally, a standard cable (that complies safety
standards) having a screened pair and an unscreened pair can be used.