Toa VS-900 - Manual (Page 30)

30
12.5. VS-900AL Telephone Interface Card Connection
12.5.1. Telephone and VS-900AL connection
The VS-900AL can be interfaced with up to 2 commercial telephone sets. Use the telephone which complies
with the FCC Regulation Part 68.
[Connection]
To connect the telephone set to the VS-900AL, use a twisted pair cable. The connector of the cable end going
to the telephone needs to be the type that can be connected to the telephone connector. Perform wiring as
shown below so that the loop resistance is less than 500 Ω including the telephone resistance.
Telephone and VS-900AL connection
VS-900AL
CN1
CN2
CN3
CN4
1 twisted pair cable
1 twisted pair cable
Telephone set
Telephone set
Line 1
for telephone
Line 2
for telephone
Front view of
the circuit board
Ferrite clamp *
Ferrite clamp *
* Mount the ferrite clamp (supplied with the VS-900AL 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.)
VS-900AL 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.