Huawei MA5833-BS60 Commissioning Manual page 32

MA5833-BS60
Hardware Commissioning Guide
Parameter
catv-attenuation catv-attenuation
main-att main-att
main-first-eq main-first-eq
main-second-eq main-second-eq
In the Upstream Direction
The downstream attenuation can be calculated using the following formula:
ATT4 (or ATT5) = Input power of the RF port – Rx power of the DOCSIS module + Gain
from the RF port to US
ATT4 (or ATT5) = (40 – 20) – 6 + (–6), ATT4 (or ATT5) = 8
ATT6 (or ATT7) + ATT4 (or ATT5) = Optimum input power of the RF port on a single
channel – Tx optimum receive power on a single channel + Gain from the RF port to Tx
ATT6 (or ATT7) + 8 = 25 – 10 x lg((85 – 5)/6) + 8 – 35 + 20. Therefore, ATT6 (or ATT7)
= –1 dB ≈ 0 dB.
Issue 01 (2018-12-12)
NOTE
l Gain from the RF port to the US = –6 dB; ATT4 (or ATT5) = 0
l In the above formula, Optimum input power of the RF port on a single channel = Optimum input
power of Tx link signals – 10 x lg (number of upstream channels) + ATT4 (or ATT5)
l Optimum receive power of the Tx module on a single channel = 35 dBmV
l Gain from the RF port to the Tx module = 20 dB; ATT4 (or ATT5) = 0; ATT6 (or ATT7) = 0
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6 Configuring Intelligent RF Adjustment
Adjustment Item
0
3
8
10
29