AMX DTMF+ Interface AXB-DTMF+ - Manual (Page 8)

Configuration and Installation
4 AXB-DTMF+ DTMF+ Interface
Line Setting mode
The 2-position jumper JP1 selects PHONE or LEASED line operation when system powers on.
FIG. 3 shows the default setting.
To change the line setting default from PHONE to LEASED :
1. Remove the AXB-DTMF+ cover from the unit housing.
2. Remove the jumper from pins 2 and 3, and place it on pins 1 and 2.
3. Re-install the AXB-DTMF+ cover onto the unit housing.
Wiring the AXB-DTMF+
Preparing captive wires
To connect the wiring into a captive-wire connector:
1. Strip 1/4 inch off the wire insulation for all four wires.
2. Tin 2/3 of the exposed wire.
3. Insert each wire into the appropriate captive-wire connector up to the insulation.
4. Tighten the captive screws to secure the fit in the connector.
Wiring guidelines
The interface requires a 12 VDC power to operate properly. The interface uses a PSN2.8 power
suppl. The Central Controller supplies power via the AXlink cable or external 12 VDC power
supply. The maximum wiring distance between the Central Controller and interface is determined
by power consumption, supplied voltage, and the wire gauge used for the cable. The table below
lists wire sizes and maximum lengths allowable between the AXB-DTMF+ and Central Controller.
The maximum wiring lengths for using AXlink power are based on a minimum of 13.5 volts
available at the Central Controller’s power supply.
FIG. 3 Line Setting jumper JP1 (default setting = PHONE)
pin 3
pin 2
pin 1
Phone
Leased
If the device is using a separate power supply, do not connect the power wiring from
the AXB-DTMF+ to that device.
Wiring Guidelines at 80 mA
Wire Size Maximum Wiring Length
18 AWG 1467.14 feet (447.18 m)
20 AWG 928.22 feet (282.92 m)
22 AWG 578.70 feet (176.39 m)
24 AWG 364.79 feet (111.19 m)