ICentral System One M200 Installation Manual - page 10
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MAXIMUM LENGTH FOR CABLE RUNS
The system may be "starwired" from a central point or "loopwired" however the number of
stations on a loopwired run governs the overall length of the run.
The table below shows the relationship between the length on a cable run and the number of
stations permitted on the run.
A cable run is considered to begin at the station to which the power supply is connected.
Number of Room Stations for a given length cable run
Max Cable Length
No. of stations permitted
100 metres
1 Room Station
50 metres
2 Room Stations
33 metres
3 Room Stations
25 metres
4 Room Stations
Number of Doom Stations for a given length cable run
Max Cable Length
No. of stations permitted
80 metres
1 Door Station
40 metres
2 Door Stations
Note: The above charts are based the use of CAT5 or VALET 8 cable
Where required, the above maximum distances can be doubled by running a “figure 8” cable
(14 x 0.2 mm) in parallel with the POS & NEG wires.
Note: It is vitally important that the POS and NEG wires are balanced in terms of the type of wire and the number of
wires being used i.e. if a Cat5 wire and a Fig 8 wire are being used for the positive connection, a Cat5 wire and
a Fig 8 wire should also be used for the negative connection.
CABLE COLOUR CODING
Please note, that while the use of recommended colours are only of importance to maintain
convention, it is important that twisted pairs are used particularly for the communication pair
(COM1 and COM2) and for the music pair (MUS1 and MUS2).
FUNCTION
CAT5
VALET 8
TELEPHONE
POS
GREEN/WHITE
RED
RED
NEG
GREEN
BLACK
BLACK
TC
ORANGE/WHITE
SHIELDED RED (OR GREY)
GREEN
VLC
ORANGE
SHIELDED WHITE (OR YELLOW)
ORANGE
COM1
BLUE/WHITE
WHITE
WHITE
COM2
BLUE
BLUE
BLUE
MUS1
BROWN/WHITE
GREEN
N/A
MUS2
BROWN
ORANGE
N/A