User & Programming Manual
DX2000 XL – Hotel Version
29
The moment, power is fed to the PFCT, relay of all the PFCT ports will be switched-on. In
this scenario, JP3 & JP2 will remain short circuited while JP1 gets isolated from JP2 & JP3
& JP1 gets connected with JP4. Means subscriber will get connected to the line card & he
will get disconnected from the trunk.
From Line card of DX
Trunk line from
PSTN
N/W
To Trunk card
To Subscriber Side
Working of powered PFCT
Example: Let us explain the connections for only one port.
For example, trunk which is connected to first trunk port, should be connected to analog
extension no. 208 So for the same, follow the steps -
JP1_1 must be connected to the field side of the extension 208.
JP2 must be connected to the trunk port.
JP3 must be connected to the trunk, which is coming from PSTN.
JP4 must be connected to the extension number 208 of the line card.
Now when power is not there, JP1 is shorted with JP2 & JP3. Means trunk is connected to
the instrument as well as trunk card. The moment, power is up, JP1 will be isolated with JP2
& it will be connected to the JP4 & rest will be as it is. Means now instrument will be isolated
from trunk & it will be connected to the extension port.
Note: A key phone cannot be used as the destination of the trunk in the event of power fail.
JP4
JP3
JP2
JP1
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