AT&T System 85 manual 425

ISDN 8510T Voice/Data Terminal

Power Requirements

Phantom or Auxiliary Power

The 8510T can receive power from the switch or from an auxiliary power supply.

Note: A voice/data set should be auxiliary powered only.

The installer can select the type of power used by placing the two power jumpers over the correct set of pins.

The power option jumpers are located at the bottom center of the terminal. On the right side of the pins, on the plastic housing, you will see the label POWER and a diagram of the correct set- tings. The jumpers are labeled PHAN (phantom power) and AUX (auxiliary power). The terminal is shipped in the AUX position. You must verify that the jumper settings are set correctly for your configuration.

Note: The power jumpers must be set only by qualified service personnel.

PHAN (phantom power) should be selected when power is provided by the PBX. When the jumpers are set to PHAN, in idle condition, less than one Watt of power will be drawn from the switch. The power option resistors are set to PHAN if each of the two jumpers covers the two top pins in each set. (The bottom pin in each set is left uncovered.)

AUX (auxiliary power) should be selected when power is provided in the closet. When the jumpers are set to AUX, the 8510T will operate on a nominal 40 or 48 Vdc, UL-listed Communications Circuit Power source. The power option resistors are set to AUX if each of the two jumpers covers the two lower pins in each set. (The top pin in each set is left uncovered.)

Important: It is a requirement that 8510T voice only terminals in a multipoint configuration (two or more terminals per port) be auxiliary powered. If used ONLY in a point-to-point configuration (one terminal per port), 8510T terminals may be phantom powered. When used in a mixed point-to-point and multipoint confi- guration, all 8510T terminals MUST be auxiliary powered.

If a phantom powered 8510T is moved from an existing point-to-point to a mul- tipoint configuration, the power jumper must be changed from PHAN to AUX, and the terminal connected to an auxiliary power source. The terminal will still work in the PHAN mode, but the power jumper must still be changed. Exceed- ing the phantom power capacity will trip the breaker in the carrier, causing a loss of service.

3-425