Adjusting The Upstream Docsis Signal Level - Huawei MA5833 Hardware Commissioning Manual

MA5833-DD60
Hardware Commissioning Guide
Bracket to Be Adjusted
ATT0
ATT1
ATT2
ATT3
No.

5.3 Adjusting the Upstream DOCSIS Signal Level

Step 1 Confirm the CM-side output level of the RF OUT port and record it as A. Run the display
cable modem extended-tx-power command to query Extended US TX Power. A =
Upstream TX Power - cable line attenuation.
Step 2 Run the cable upstream command to configure the upstream receive level of DOCSIS
module (B). The default value is 6 dBmV.
Step 3 Input single-tone signals (20 MHz and 40 MHz) into the test points of the RF OUT port,
respectively. Set the signal level to A+20 dBuV.
Issue 01 (2018-12-26)
Parameter to Be
Adjusted
Level of combined CATV
and downstream DOCSIS
signal of the RF OUT0.
Level of combined CATV
and downstream DOCSIS
signal of the RF OUT1.
Level of combined CATV
and downstream DOCSIS
signal of the RF OUT2.
Level of combined CATV
and downstream DOCSIS
signal of the RF OUT3.
Test point
TP.1
TP.8
TP.9
TP.4
TP.7
Copyright © Huawei Technologies Co., Ltd.
5 Adjusting the Signal Level
Default value (dB)
4
4
4
4
Function
Tests level of the RF OUT0
port signal.
Tests level of the RF OUT1
port signal.
Tests level of the RF OUT2
port signal.
Tests level of the RF OUT3
port signal.
Tests level of combined
CATV and downstream
DOCSIS signals. (Main)
12