Laskomex CD-2502 Series Installation, Service And Programming Manual page 18

6.1 Performance of wiring system
It is forbidden to make wire branching (e.g. in junction boxes). Wire should be
routed from one receiver (monitor, distributor, switch) to the next one. A rule
should be obeyed that signal sent to the receiver by one wire and goes out by
the other. Both wires are connected on receiver terminals.
Wiring system at the section between electronic cassette and monitors should
be made in form of bus-bar with distributors CVR-x. To one distributor 4
monitors should be connected.
Section between electronic cassette and distributors should be made using spiral
UTP cat.5 or telecommunication spiral (e.g. YTKSY).
Section between distributor and monitors should be made using spiral UTP
cat.5. In case of CVR-1 plugs RJ45 should be installed on wire ends at the
distributors (according to the instruction).
Total length of a segment electronic cassette – distributor + distributor –
monitor should not exceed 150m.
In entry phones with many occupants a wiring system should be made in form
of a branch. In one branch up to 10 receivers (monitors or distributors) can be
connected. The next branch can be made by treating one of the outputs from
any distributor as a beginning of a branch.
An attention should be paid to the adjustment of wire wave impedance to the
impedance of the connected equipment. In equipment installed at the beginning
and at the end of the line a resistor should be installed in parallel to the line
of value equal to cable wave impedance. In other equipment connected to the
line no load resistors should be installed. Load resistance in external panel,
monitors, distributors and switches is set by jumpers.
Mixed systems, in which uniphones and monitors are used at the same time,
are allowed.
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230V
8
EC-2502/U
Figure 5: Connection of monitors by means of distributors CVR-x
2
230V
8
CVR-1 CVR-1
8
6 INSTALLATION AND ACTIVATION
2
8
230V
CVR-2
17
8
2
230V