User Guide: Technical Reference
SECTION 3 OPERATING THE
ioLink 4
PRELIMINARY
Customer Support (202) 333-7031
-3-14
3.2 Rear Panel Connections
The connectors on the rear panel are used for coupling the modem unit to:
The RF unit, through two female TNC coaxial connectors.
A “hot-standby” switch, through a terminal block.
A remote control device (e.g., terminal, PC, or modem), through a male DE-9 connector.
An E1 input device, through two female BNC connectors (TX and RX).
A T1 input device, through an RJ-48C connector (DSX).
RJ-45?
A three-prong EIA connector for supplying AC power to the modem unit.
The following sections explain, in detail, the function of each connector on the back of the Modem Unit.
3.2.1 Power Connector
The power-input module is a combination male three-prong EIA interface, AC inlet, and a rocker on/off
switch. A standard grounded power cable is sufficient for connecting to an AC power source (e.g., any
common wall-mounted receptacle). As indicated in the Technical Specifications in Appendix A of this
document, the modem unit uses less than 250 mA AC. The ground for the internal power supply is
attached to the enclosure of the Modem Unit
The DC Input module is a combination rocker switch and terminal block as shown in the DC variant of the
Modem Unit Rear Panel figure. The unit will accept DC input from 36 – 72 volts. The chassis of the
Modem Unit and the grounding of the internal power converters are connected to the ground pins on the
terminal block. As indicated in the Technical Specifications, the current draw is 450 mA at 48 V input; this
is used to power both the Modem Unit and the 2.4 GHz, or 5.7 GHz, RF Unit.
Figure 3-9. Modem Unit
Rear Panel
ALARM
CAUTION!
RF Interface
+48VDC on TX
AC Power
90 -260
VAC
50/60 HZ
