General I
n
form
ation
General Information
4
List of abbreviations
ED
Apartment button
TÖ
Door opener
UV
Subdistribution
Terminal designations
a
Bus terminal
b
Bus terminal
ED
Apartment button
ED
Apartment button
a1
Main bus line
a2
Main bus line
a3
Main bus line
Va
Bus terminal, video bus
Vb
Bus terminal, video bus
Information on article numbers
The article numbers of RITTO products are made up of three components. For example 1 7630/70
1 7630
/ . .
Device: TwinBus indoor telephone
/7 .
Colour: white
/ . 0
Device index
This document only specifies information on the respective device. Please refer to the RITTO Manual for the colours
available and current device versions.
General Information
Cable networks
Existing lines can be used as bus lines. We recommend the following, commercially available telecommunication lines:
Telecommunication line J-Y (St) Y
Telecommunication line J-2Y (z) Y with strain-relief
Telecommunication grounding cable, longitudinally and transversally waterproof
Cable layout
It is recommended to lay the bus line from subscriber to subscriber and to connect it to the connection terminal on the
device.
All the line screening sheaths must be connected across the joints and laid to Terminal b on the TwinBus power sup-
ply unit. Please use appropriate locally provided terminals for this.
The stranded video line Va/Vb can generally be laid in the cable with the screened a/b lines.
In order to fulfil the general safety requirements for telecommunication systems complying to VDE 0800 and prevent
disturbances on the lines, ensure that the mains voltage and SELV (TwinBus line) are laid separately. A clearance of
10 cm must be maintained for the installation. In the case of a common line cabling, a separating webbing must be
inserted in the installation channels.
Bus lines a/b must not be terminated with terminal resistors.
Caution!
Malfunctions due to strong magnetic fields
No other devices with strong magnetic field (contactors, transformers, etc.) may be installed in the
direct vicinity of the power supply unit and additional devices. Malfunctions could be caused by
induced voltage peaks.
