User's Manual

Installation
Procedure
The repeater unit should be installed in a sheltered area, it’s operating
temperature range is extensive, but is not sealed to prevent water (rain)
ingress. The repeater unit should not be installed in an area where the
ambient temperature is expected to exceed +60°C.
The indoor and outdoor antenna locations must be chosen carefully to avoid
re-generative feedback. Re-generative feedback occurs when the subscriber
antenna picks up the donor antenna transmit signal. A general rule of thumb
is to locate the antennae where the isolation is at least 10 dB greater than the
operating repeater gain. The Arrista repeater has a maximum gain of 60dB in
uplink path, as a result, the isolation required between the subscriber and the
donor antenna is in a range of 70dB. The line of sight separation between the
subscriber and donor antenna represented by a free space loss of 70dB
within a building is 17 meters (55 feet). The separation distance can be
reduced if the donor antenna is mounted on the building exterior (i.e. on a
roof), or using a directional donor antenna (narrow beam width).
The following table indicates separation distances for different installation
configurations:
Line of Sight
in-building
Exterior Donor Antenna,
with 20dB Attenuation
1
Exterior mounted
Directional Antenna
2
Separation Distance
meters (ft)
17 (55) 8 (26) 4 (13)
1
The attenuation is indicative of the construction material that a signal has to penetrate through
2
As in
1
, but using a directional antenna with a typical front to back ratio of 20dB
It is not recommended that the donor and subscriber antennae be installed
within sight of each other. Do not install the unit where a skylight or other low
loss RF path exists between the donor or subscriber antenna.
Arrista recommends that the donor antenna be installed on the roof or on an
CRxxx
Primary
Indoor
Antenna
Optional
Secondary
Antenna