User's Manual

3 Commissioning
Page 21
3.2.4. Connection of the Extension Unit
This 7-pin extension-port connector (type: Andrew standard) is equipped with one
cable bridge with four RF cables. Connect this cable bridge at the “Extension port
connector” of the RU (see figure 3-2) with the corresponding connector at the EU.
PIN Assignment
1 Not used
2 Not used
3 OTRx 17-21 UL
4 OTRx 17-21 DL
5 Not used
6 RS485 D+/R+
7 RS485 D-/R-
figure 3-5 Extension-port
connector
table 3-3 Extension-port connector, pin assignment
To prevent damaging the connectors of the extension port, align the plug end
of the connector properly before inserting. Do not twist the connector. When
the connector is in place, tighten the screws in a clockwise direction. Particular
attention must be paid plugging this connector to maintain the ingress
protection class of the Remote Unit.
3.2.5. Connection of the Antenna Cables
The Remote Unit has 7/16-type antenna connectors. For its location please refer to
chapter 3.2.2 Connections. For mounting the cable connectors, it is recommended to
refer to the corresponding documentation of the connector manufacturer. The
bending radius of the antenna cables must remain within the given specifications.
For the selection of cable and antenna it should be considered that, on the one hand,
a cable with higher loss is less expensive but, on the other hand, it impairs
performance.
Use an appropriate torque wrench to tighten the 7/16 DIN-type (1 ¼ -inch
opening) antenna connectors to a coupling torque of 25 N-m / 19 ft lb. Torque
wrench item no. 244377, available from the CommScope e-catalog, is
recommended. Do NOT use your hands or any other tool (e. g. a pair of
pliers)! This might cause damage to the connector and lead to a malfunction of
the Remote Unit or increased PIM.