Additional System Setup; System Uplink/Downlink Balance; Calculated Input Level; Changing Or Swapping Equipment - ZinWave UNITIVITY 5000 User Manual

UNItivity 5000

Additional System Setup

User Manual
11 Additional System Setup

11.1 System Uplink/Downlink Balance

The uplink / downlink balance allows for variation in transmit and receive path gains depending upon
system requirements. A mobile device will estimate the level at which it should register with the base-
station, based on its received downlink strength, and adjusting the balance in the DAS affects the
reliability of devices registering on the system.
With the uplink / downlink balance at its default value of 0, the uplink and downlink gains are equal. A
setting of +5 will request an uplink gain of 5dB higher than the downlink gain. Similarly, a setting of -5dB
will set the uplink gain at 5dB lower than the downlink gain.
Note: The maximum gain of the system is 25 dB (< 2.7GHz) or 29 dB (> 3.3GHz, and > 1575MHz for
305-1007 Remote Unit). If levels configured in the system require greater gain, then System Setup will
limit the values to an achievable gain.
The actual gain is determined by a combination of input, output and balance parameters. The gain is
primarily defined from the Downlink parameters. The downlink gain, before service balancing, is
determined by the Calculated Input Level and the Remote Unit Downlink power. For example, to
achieve a downlink gain of 25dB with an output level set at +18dBm the minimum input level that can
be set is -7dB when a single service module is enabled. When the Uplink / Downlink balance is set to
0dB, the system will try to set the uplink gain to the same value as the downlink gain.
However, the Uplink gain is also constrained by the Uplink AGC Threshold configured on the Remote
Unit, and the maximum output level of the Service Module in the uplink direction. The maximum output
level of the Service module is +5 dBm. If the user attempts to apply settings that may result in the
output level of the service module being exceeded, then the system will automatically limit the DAS
uplink gain to avoid this. The user may need to lower the uplink AGC thresholds to reduce the maximum
uplink level from RUs.

11.2 Calculated Input Level

The Calculated input level is the measured composite power level delivered to the Service Module from
the Signal source (BTS, POI etc.). The total composite input power level should not exceed +15dBm.
Care must be taken to ensure that the setting reflects the total power possible at the SM. It is important
to know not only what is currently connected and being measured, but also what will be present when
fully loaded services are present.
Particular care should be taken when using CDMA signals where the initial power measured is often
that of the Pilot and not the maximum transmit power. Similarly, with cellular services, initial
measurements often do not show all traffic channels which will only be operational under loaded
conditions.

11.3 Changing or Swapping Equipment

If equipment is removed from an existing system, the system will recalibrate links and apply stored
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