I ns t al l at i o n G u id e li n es C MA - XX X- A E N
P a ge 1 8
Draft
3.4.4
Cable Routing
Ensure all cables, e.g. power cable, feeder cable, optic fiber, commissioning cable, connecting are properly routed and secured
so that they are not damaged.
3.5
RF Coaxial Cable Guidelines
3.5.1
General RF Cable Installation Procedures
Note: The installer should be familiar with the ANSI/TIA/EIS-568 Cabling Standard guidelines.
•
Observe the general cable installation procedures that meet with the building codes in your area. The building code requires
that all cabling be installed above ceiling level (where applicable). The length of cable from the risers to each antenna must
be concealed above the ceiling.
•
The cable must be properly supported and maintained straight using velcro cable ties, cable trays and clamps or hangers
every 10 feet (where practical above ceiling level). Where this is not practical, the following should be observed:
•
The minimum bending radius of the supplied ½” coax cable should be 7”.
•
Cable that is kinked or has a bending radius smaller than 7” must be replaced.
•
Cable runs that span less than two floors should be secured to suitably located mechanical structures.
•
The cables should be supported only from the building structure.
•
All cables shall be weather-resistant type
.
•
Cable length - determined by the system installation plan. When calculating the cable length, take into account excess
cable slack so as not to limit the insertion paths.
3.5.2
RF Rules
•
Use coax RG-223, 50 ohm, male-to-male N-type to QMA for RF connections from the RIMs to the BTS/RBS and to the
MRU.
•
When using the Corning remote unit in an environment in which other indoor coverage systems are installed, it is
recommended (where possible) that the antennas are placed at least two meters apart
•
When bending coax cables, verify that the bending radius does not exceed the coax specifications.
•
Use wideband antennas supporting a range of 300 MHz to 3 GHz
•
Terminate all unused MRU RF ports with a 50 ohm load
•
Make sure that the VSWR measured at the coax cable meets the product specification The VSWR must be measured prior
to terminating the MRU RF ports in the remote communication rooms.
3.5.3
Coax Cable Lengths and Losses
Use coax RG-223, 50 ohm, for RF connections between MRU unit and DAS antennas.
Note: The required distance between the antennas (installed in the ceiling) depends on the infrastructure and calculated
path-loss. For example, if there is free space-loss between the antennas, a minimum distance of 100 ft is required; if there are
partitions (loss) between the antennas, a distance of less than 100 ft between them is allowed.
Coax Length
Coax Loss
(900 MHz)
Connector
Loss
Total Loss
30
0.7
1.5
2.2
40
0.9
1.5
2.4
50
1.1
1.5
2.6
60
1.3
1.5
2.8
