Equipment Connections; Grounding Connection; Rf Cable Connection; External Alarm Connection - Comba Telecom RX-1839 User Manual

3.5

EQUIPMENT CONNECTIONS

3.5.1 GROUNDING CONNECTION

Ground Connection
To ensure safe operation of the product, a ground (earth) connection is required. For single phase AC
power source, the product must be grounded by connecting the "earth wire" of the power cord to the ground
terminal of the AC supply. For operating this product with DC power system (such as rectifiers), the product
should not be connected to power systems that switch open the return lead because the return lead could
function as the ground (earth) connection for the equipment.
Protective Ground Connection
The enclosure must be grounded securely by connecting a copper wire (CSA 16mm
terminal on the equipment/rack, and the other end to a protective ground (i.e. building earth point). An
internationally acceptable colour code of the ground connection wire is green/yellow.
Such a ground connection implements the "Protective Ground Connection", and must be connected to the
equipment at the designated ground point. In general, do not connect the supply before establishing an
adequate ground (earth) connection.
Construct the ground wire, and use appropriate crimp connectors where necessary. Locate and connect the
equipment grounding terminal to a protective ground (i.e. building earth point).

3.5.2 RF CABLE CONNECTION

The connection of feeder cables is as follows:

MT port  Connects to the feeder cable from service antenna.

DT port  Connects to the feeder cable from donor antenna.

3.5.3 EXTERNAL ALARM CONNECTION

For RU, this is a 7-pin CPC connector. The following figure and table show the pin allocation and definition.
Pin numbering are shown looking-into the connector on the enclosure.
Pin number 1
Alarm EXT.
definition Alarm 1

3.5.4 MODEM ANTENNA CONNECTION

Connect modem antenna with "MODEM ANTENNA" port in the panel.
ENU STATUS : 1-0-0
INSTALLATION GUIDE FOR RX-1839
1
3
6
Figure 9 Pins Allocation for "EXT_ALM" Port for RU
Table 3: Pin Definition of "EXT_ALM" Port for RU
2 3
EXT.
Reserved
Alarm 2
Copyright - refer to title page
2
5
4
7
4 5
GND Reserved
2
) to the grounding
6 7
Reserved Reserved
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