Avitec AB FD-3100A ユーザーズマニュアル

 

 
Generally, the fiberoptic and DC power cable, the antennas with flexible coaxial cable connections and the 
Remote Transceiver mounting plates can be installed first. Then, the FiberDAS components, Hub Shelf, 
Remote Transceiver Units and Remote Power Supplies (if any), can be added easily and the system 
powered on. 
 
Before installing and, in fact, before even receiving the FiberDAS units, one can have the fiberoptic cables 
installed and tested. The network planning has been completed which has determined the type, number and 
location of Remote Transceivers needed for optimum coverage and capacity. 
 
Install and check the fiberoptic cables first. Use any high quality, telcom grade singlemode fiberoptic 
cable. If the central DC Power Supply is used, either use a composite cable with a singlemode fiber pair 
and a pair of wires built into the same cable, or pull a separate two-fiber fiberoptic cable and a two wire 
DC connection together. The gauge or size of the wire to be used depends on the distance to the Remote 
Unit.  The SC/UPC optical connectors can be installed on site using the Seicor Unicam connector system. 
One can learn how to install the Unicam SC/UPC connectors easily. However, the terminations must be 
done carefully and well to ensure proper performance. Poor optical connections are by far the most 
common cause for system performance degradation.  
 
! Make sure to specify SC/UPC, not SC/PC. The standard SC/PC has an optical return loss < 27 dB 
which can cause degradation of the system noise performance.  SC/UPC specifies an “ultra” polish for 
a return loss > 50 dB. 
 
General practice is to terminate the fiberoptic cables at a patch panel near the Hub Shelf. In this case, 
optical jumper cables will be needed to make the connection between the patch panel and the Hub Shelf. 
During this process, label each cable at each end to indicate whether it is transmit or receive and which 
Remote Transceiver it is associated with. As part of the planning, decide whether it would be good to pull 
one or two additional fiber pairs to each Remote Transceiver to allow for future expansion. Also, leave a 
service loop near the Remote Transceiver location in case the unit needs to be moved. Next, mount the Hub 
Shelf in the rack and connect the fiberoptic cables. Do not connect the RF cables yet. 
 
Mount the Remote Transceivers. Install the wall mounting brackets first. For mounting above a false 
ceiling, the preferred method is to orient the bracket so that the end of the Remote Transceiver with the 
connectors is pointing downwards. The unit could also be mounted horizontally with the connectors to one 
side. When mounting inside the room, the preferred method is to place the Remote Transceiver near the 
ceiling with the connectors pointing upwards. This permits the most aesthetic routing of the cables. The 
plastic cover on the Remote Transceiver may be removed by loosening the six screws on the back of the 
Unit. This permits the user to paint the cover to match the room décor. If the Remote Transceiver is to be 
installed with the Remote Power Supply, install the two mounting brackets next to each other linking them 
with the connector piece supplied with the power supply mounting bracket. This will give the most 
aesthetic mounting with the proper spacing for an easy DC power connection. ( Note: the Remote AC 
Power Supplies are not to be installed above a false ceiling.) Orient the bracket so that the threaded tab 
will be at the same end as the connectors on the Remote Transceiver.  
 
Before mounting the Remote to the bracket, attach the Optical RF and DC cables to the Remote. If the 
plastic cover is not to be used, you may remove it by removing the four screws that hold it on. This will 
make it easier to attach the cables. 

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