MA5800 X2 channel congestion

Hello, friend!

You can solve this problem by extending the upstream channel bandwidth.

There are two methods to improve the uplink bandwidth. one is to widen the width of the channel while the other is to improve the QAM. 

From the current configuration, now the frequency spectrum is from 24~40M, so need to check whether can be widened, then widen each channel. the command is “cable upstream channel-id channel-width width”.Now the width of each channel is 3200K and can be adjusted to 6400K.

The other way is to improve the QAM. Now the QAM size of profile 24 is QAM16, which can be improved to QAM64 by changing to the modulation profile 26 on the condition that the SNR is good enough. The command is “cable upstream channel-id modulation-profile profile-index”

cableupstream 1 modulation-profile 24 frequency 24.00 minislot-size 4 enablerf-power 0.0 ranging-backoff 3 6 ranging-holdoff 0x7d00

cableupstream 2 modulation-profile 24 frequency 27.20 minislot-size 4 enablerf-power 0.0 ranging-backoff 3 6 ranging-holdoff 0x7d00

cableupstream 3 modulation-profile 24 frequency 30.40 minislot-size 4 enablerf-power 0.0 ranging-backoff 3 6 ranging-holdoff 0x7d00

cableupstream 4 modulation-profile 24 frequency 33.60 minislot-size 4 enablerf-power 0.0 ranging-backoff 3 6 ranging-holdoff 0x7d00

cableupstream 5 modulation-profile 24 frequency 36.80 minislot-size 4 enablerf-power 0.0 ranging-backoff 3 6 ranging-holdoff 0x7d00

cableupstream 6 modulation-profile 24 frequency 40.00 minislot-size 4 enablerf-power 0.0 ranging-backoff 3 6 ranging-holdoff 0x7d00

Thanks!