Installation Manual

DEKOLINK WIRELESS LTD. PRODUCT MANUAL IDEN REPEATER
transmission) of a certain base station to maximum output power might generate
network problems (they unnecessarily increase the noise in a certain cell). By keeping
the same gain for full traffic as well as for pilot only transmissions situations, the
Dekolink CDMA SALC feature minimizes this effect.
No adjustments are required: When installing the repeater, the standard procedure
for the technician is to tune the repeater to the desired isolation and gain values. With
SALC, the tuning procedure is accomplished automatically, thus saving precious
workmanship and equipment usage time for a “plug & play” foolproof deployment.
Uplink and downlink balance is preserved. In previous repeaters, separate
adjustments are required for the uplink and downlink. This repeater requires just one
adjustment for both channels. If the gain of downlink path changes by some value,
the uplink path is changed by the same value. Both channels have to be balanced for
the proper seamless integration of the repeater in the network. Unbalanced operation
bares the risk of reducing the dynamic range of the base station itself.
Reduction of isolation problems: .This repeater does not oscillate. Whenever the
isolation drops for some reason the repeater automatically senses the oscillations and
automatically reduces the gain in accordance with the new isolation conditions. Once
the isolation problem is solved the repeater automatically raises the gain again. This
operation is remotely monitored, and if required, remote controlled.
SALC - Summary: Conventional CDMA/WCDMA repeaters often interfere in the
network when strong traffic raises the repeater input signal level, which as a result
activates the ALC algorithm of the system. Once under ALC, the conventional
system is no longer in its linear dynamic range, hence creating interferences in the
cell shrinking or expanding procedures. The Smart ALC solves this problem and thus
reduces the need for adjustments. The repeater does not interfere with the network
shrinking or expanding processes and thus becomes “network friendly “.
This automatic operation practically removes the need to make initial settings for
maximal traffic load conditions and eliminates the need for numerous site visits to
take care of Gain adjustment.
SALC also reduces isolation problems and maintains Uplink/Downlink balance.
3.4.2 ALC Function
The Repeater includes the Automatic Level Control (ALC) function on both the
Uplink and Downlink power amplifiers to prevent output power from exceeding
maximum allowed output power.
The amplifier includes a directional coupler and a detector that monitor the output
power. The ALC mechanism samples the output power, and decouples and rectifies
it. The ALC mechanism sends a feedback signal to a voltage variable attenuator
(VVA) that, whenever a high input signal is received, attenuates the signal level so
that the output power of the amplifier does not exceed the preset limit. In normal
operation (SALC ON) the regular ALC is not active.
The ALC is factory preset to ON state.
Pub. 311-2005 Rev. 1.0 Proprietary Data Page 9