External Alarm System Connections - ADC Digivance User Manual

1. Obtain the required length of high performance, flexible, low loss 50-ohm coaxial
communications cable for the antenna coaxial connection.
2. Route the coaxial cable between the RIU and the donor antenna (per system design) and
cut to the required length. Allow sufficient slack for dressing and organizing cables at the
RIU and antenna.
3. Terminate each cable end with a type N male connector following the connector
supplier's recommendations.
4. Connect the RIU end of the antenna cable to the ANTENNA connector on the RIU front
panel as shown in Figure 10.
5. Connect the antenna end of the antenna cable to the donor antenna.
6. Dress and secure cables at the RIU and donor antenna.

2.6 External Alarm System Connections

The alarm interface between the RIU and an external alarm system is supported by a six-
terminal plug (with screw-type terminals) that connects to a receptacle on the RIU front panel.
The terminal plug provides connections to normally open (NO) and normally closed (NC) dry
type alarm contacts for both minor and major alarms. A category 3 or 5 cable is typically used
to connect the RIU to the external alarm system. Use the following procedure to install the
alarm wiring and connect it to the RIU:
ANTENNA
CONNECTOR
TYPE-N MALE CONNECTOR
Figure 10. RIU Antenna Cable Connection
ADCP-75-114 • Issue 2C • January 2002
16653-A
Page 13
© 2002, ADC Telecommunications, Inc.