Digital Repeater Line
DSP85 Series
WESTELL.COM
© 2016 Westell Technologies
14 June 2016 Doc. No. 960-1666-MNL rJ
1.877.844.4274
Page 50 of 77
A.3
Dynamic Range Thresholds
Table A-1: Dynamic Range Thresholds
Input Signal Max Gain Input Signal Max Gain
<-45 dBm
85 dB
-32.2 dBm
69 dB
-44.3 dBm
84 dB
-31.4 dBm
68 dB
-43.6 dBm
83 dB
-30.6 dBm
67 dB
-42.9 dBm
82 dB
-29.8 dBm
66 dB
-42.2 dBm
81 dB
-29 dBm
65 dB
-41.5 dBm
80 dB
-28.2 dBm
64 dB
-40.6 dBm
79 dB
-27.4 dBm
63 dB
-39.7 dBm
78 dB
-26.6 dBm
62 dB
-38.8 dBm
77 dB
-25.8 dBm
61 dB
-37.9 dBm
76 dB
-25 dBm
60 dB
-37 dBm
75 dB
-24.4 dBm
59 dB*
-36.2 dBm
74 dB
-23.8 dBm
58 dB*
-35.4 dBm
73 dB
-23.2 dBm
57 dB*
-34.6 dBm
72 dB
-22.6 dBm
56 dB*
-33.8 dBm
71 dB
-22 dBm
≤55 dB*
-33 dBm
70 dB
*We recommend padding this level, due to potential for fluctuating signal.
-25 dBm is the maximum input signal level that can be applied to the repeater, even if the gain is set to 53.5 dB. Input
signals exceeding these thresholds will result in composite input attenuation, or analog-to-digital converter
protection (ADC protect). Output power is reduced whenever the above thresholds are exceeded by reducing the
gain by 1 dB for each 1 dB that the threshold is exceeded. Do not confuse ADC protect with AGC (automatic gain
control), which reduces gain to prevent in-band (measured) output power from exceeding the specified maximum
output level.
Gain levels that would result in exceeding the rated output power of the repeater, e.g. 65dB of gain applied to an
input signal of -30dBm, will not result in ADC protection, but will result in AGC. Avoid continually operating the
repeater in AGC.
To determine the total power applied to the donor and server ports, reference the composite input values as listed
on the System Status page in the web GUI.
A.4
Large Deltas between In-band and Composite Input Signals
Isolate the best donor site to ensure the least possible delta between in-band and composite downlink signals.
If the (downlink) composite input exceeds the in-band input by more than 3 dB Cellular, or more than 5 dB PCS, the
maximum output power will be reduced.
