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Vic-Viper
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QAM1024 issue on Hub 4

Good morning,

I recently posted about my speeds since I upgraded from a M500 to Gig1 fibre package and the speeds fluctuating between the lowest of 500 to around 950.

I have since been advised that the modulation on the DOCSIS 3.1 channel should be at QAM4096 when it is showing at QAM1024.

Looking at other posts regarding a similar issue I decided to pin reset the Hub 4 and to my surprise the QAM was displayed at 4096, unfortunately this was short lived and within 5 minutes it had reverted back to 1024.

The speeds when good are what I should be expecting so I feel like this could be the source of the problem.

I would like to ask if anyone who has had this problem did they manage to get it resolved?

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Re: QAM1024 issue on Hub 4

Cable Modem StatusItem Status CommentsChannel Overview Downstream Upstream

Cable Modem Status
Online
DOCSIS 3.1
Primary downstream channel
Locked
SC-QAM
DOCSIS 3.0 channels
31
4
DOCSIS 3.1 channels
1
0
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Re: QAM1024 issue on Hub 4

3.0 Downstream channelsChannel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
11390000008.69999740.946209QAM2561
21470000008.59999840.946209QAM2562
31550000008.50000040.366287QAM2563
41630000008.40000240.366287QAM2564
51710000008.19999740.946209QAM2565
61790000008.09999840.366287QAM2566
71870000008.00000040.946209QAM2567
81950000007.80000340.946209QAM2568
92030000007.80000340.946209QAM2569
102110000007.69999740.946209QAM25610
112190000007.59999840.366287QAM25611
122270000007.19999740.366287QAM25612
132350000007.00000040.366287QAM25613
142430000006.80000340.946209QAM25614
152510000006.59999840.366287QAM25615
162590000006.59999840.366287QAM25616
172670000006.80000340.946209QAM25617
182750000007.19999740.946209QAM25618
192830000007.40000240.366287QAM25619
202910000007.30000340.366287QAM25620
212990000006.80000340.946209QAM25621
223070000006.90000240.946209QAM25622
233150000007.30000340.366287QAM25623
243230000008.09999840.946209QAM25624
253470000008.19999740.946209QAM25625
263550000008.19999740.366287QAM25626
273630000008.40000240.946209QAM25627
283710000008.50000040.946209QAM25628
293790000008.59999840.946209QAM25629
303870000008.50000040.366287QAM25630
313950000008.09999840.946209QAM25631


3.0 Downstream channelsChannel Lock Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked000
2Locked12783368200
3Locked10609039500
4Locked10593091600
5Locked12757662100
6Locked12732027200
7Locked10584628400
8Locked10492888400
9Locked12679924600
10Locked12690664300
11Locked10511273900
12Locked8535656600
13Locked10434800500
14Locked10425083000
15Locked8558108900
16Locked8889474100
17Locked10780140800
18Locked10775859200
19Locked8873923700
20Locked8919110600
21Locked10780530800
22Locked10798484900
23Locked8926806800
24Locked12676653600
25Locked15282895200
26Locked15283104100
27Locked17520273100
28Locked12686141400
29Locked15307027900
30Locked15287566000
31Locked133563196900


3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
159964K1880QAM1024759


3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)
159Locked 5.491212114

 

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Re: QAM1024 issue on Hub 4

3.0 Upstream channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

14620000044.0205995120 KSym/sec64QAM3
23260000043.7705995120 KSym/sec64QAM5
33940000044.2705995120 KSym/sec64QAM4
45370000044.2705995120 KSym/sec64QAM2



3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1US_TYPE_STDMA0010
2US_TYPE_STDMA0010
3US_TYPE_STDMA0010
4US_TYPE_STDMA0010

 

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Re: QAM1024 issue on Hub 4

General Configuration
Network access
true
Maximum Number of CPEs
1
Baseline Privacy
true
DOCSIS Mode
3.1
Config file
,.iyewrkldJKDHSUBsgvca698


Primary Downstream Service Flow
SFID
10804
Max Traffic Rate
1200000450
Max Traffic Burst
42600
Min Traffic Rate
0


Primary Upstream Service Flow
SFID
10803
Max Traffic Rate
55000270
Max Traffic Burst
42600
Min Traffic Rate
0
Max Concatenated Burst
16320
Scheduling Type
bestEffort



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Re: QAM1024 issue on Hub 4

Network Log

Time Priority Description

Thu 01/01/1970 00:01:204Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu 01/01/1970 00:01:443No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 11/12/2020 02:23:265MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 11/12/2020 02:35:405DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri 11/12/2020 02:55:316CM-STATUS message sent. Event Type Code: 23; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
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