Aiphone AI-900 - Manual (Page 24)

24
[Connection]
Use 2 twisted pair cables with a modular jack fitted at each one end to connect the AI-MS900 to the
AI-900MS. Refer to the following table for the maximum recommended cable length between the two.
Cable type AWG24 (0.52 mm) AWG22 (0.65 mm) AWG20 (0.82 mm)
Distance 0.9 km 1.5 km 2.3 km
Connect as shown below.
AI-900MS and AI-MS900 connection
2 twisted pair cables
2 twisted pair cables
LINE
LINE
1234
1234
1
2
3
4
1
2
3
4
AI-900MS
CN1
CN2
CN3
CN4
Line 1
for master station
Line 2
for master station
Front view of
the circuit board
Ferrite clamp *
Ferrite clamp *
* Mount the ferrite clamp (supplied with the AI-900MS card) on the cable in a way that the cable is looped one
turn as illustrated. (This countermeasure is for complying with the CE marking and FCC requirements.)
AI-900MS card
Ferrite clamp
SFC-10
Note
When using a shielded cable, connect the shielded wire to the "FG" terminal of the exchange main frame.
Also, connect the unused cables, if included in a bundle of cables, to the same terminal.