User's Manual

68/346 Issue 01 - April 2001 - Draft 04 3CC12426AAAA TQ BJA 01
104
To connect synchronization reference cables (redundant X-Pol RBS Tx/X-Pol RBS Rx)
Using a metal hose clamp, attach a 2:1 Combiner/Splitter to the X-Pol RBS Tx pole under the X-Pol RBS
Tx/R-X-Pol RBS Tx pair; see Figure 33.
1. Using a metal hose clamp, attach a 2:1 Combiner/Splitter to the X-Pol RBS Rx pole under the X-
Pol RBS Rx/R-X-Pol RBS Rx pair.
2. Measure and cut four lengths of cable such that each length is long enough to run from the 2:1
Combiner/Splitter to the X-Pol RBS Tx or X-Pol RBS Rx mounted above it.
3. Install an N(M) connector on each end of the each cable.
4. Connect the four cables to the X-Pol RBS Txs and X-Pol RBS Rxs, as shown in Figure 33.
5. Measure and cut a length of cable long enough to run between the X-Pol RBS Tx/R-X-Pol RBS Tx
6. 2:1 Combiner/Splitter and the X-Pol RBS Rx/R-X-Pol RBS Rx 2:1 Combiner/Splitter, including the
distance required to run up each pole to the 2:1 Combiner/Splitter connectors.
7. Install an N(M) connector on each end of the cable.
8. Run the cable between the 2:1 Combiner/Splitters.
9. Connect the cable to the 2:1 Combiner/Splitters, as shown in Figure 33.
10. Ensure all connections meet the requirements of outdoor use.
11. Secure the cable according to the manufacturer’s recommendations.
2.8.5 – Connecting the RS-422 data cables
Each RS-422 data cable run is composed of two intermediate cables: one indoor-rated and one outdoor-
rated cable. The cables are connected by an RS-422 lightning arrester. Table 14 lists the cables and the
connectors required.
In a non-redundant X-Pol RBS Tx/X-Pol RBS Rx system, RS-422 data cables connect the IBS
associated with the first IBS-TLX card in a IBS group to the X-Pol RBS Tx and X-Pol RBS Rx. In a
redundant X-Pol RBS Tx/X-Pol RBS Rx system, additional RS-422 data cables connect:
– the IBS card configured for Tx control to the redundant X-Pol RBS Tx,
– the IBS card configured for Rx control to the redundant X-Pol RBS Rx.
To connect outdoor BS RS-422 data cable
For each X-Pol RBS Tx and X-Pol RBS Rx:
1. Cut a length of outdoor-rated cable long enough to connect the X-Pol RBS Tx/X-Pol RBS Rx to the
RS-422 lightning arrester.
2. At an indoor location, attach a LEMO connector to the X-Pol RBS Tx/X-Pol RBS Rx end of the cable.
Figure 34 shows the pin and signal assignment and the wire color coding. See section 9.11 for
instructions on installing a LEMO connector.