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kbtang88
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Slow Speed Power Level and SNR 1Gig Hub 4

Hi

I just upgraded to Gig1, I'm getting 200mb and no way near to 1giga. Can someone please have a look at the power levels below and let me know if they are all OK.

3.0 Downstream channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

31379000000-1.79999938.605377QAM25631
11390000007.00000040.366287QAM2561
21470000006.69999740.366287QAM2562
31550000006.59999840.366287QAM2563
41630000005.90000240.366287QAM2564
51710000005.19999738.983261QAM2565
61790000004.80000338.983261QAM2566
71870000004.50000040.366287QAM2567
81950000003.90000240.366287QAM2568
92030000003.50000040.366287QAM2569
102110000003.00000038.983261QAM25610
112190000002.40000236.609653QAM25611
122270000001.90000236.386890QAM25612
132350000002.00000038.983261QAM25613
142430000002.29999940.946209QAM25614
152510000002.20000138.983261QAM25615
162590000002.59999840.366287QAM25616
172670000002.50000038.983261QAM25617
182750000002.20000138.983261QAM25618
192830000001.90000240.366287QAM25619
202910000001.59999840.946209QAM25620
212990000001.70000140.366287QAM25621
223070000001.59999840.366287QAM25622
233150000001.40000238.983261QAM25623
243230000001.00000038.983261QAM25624
253310000000.79999938.983261QAM25625
263390000000.40000238.983261QAM25626
27347000000-0.50000038.605377QAM25627
28355000000-1.20000138.983261QAM25628
29363000000-1.59999838.983261QAM25629
30371000000-1.70000138.605377QAM25630



3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

31Locked38.60537700
1Locked40.36628700
2Locked40.36628770
3Locked40.36628700
4Locked40.366287160
5Locked38.98326100
6Locked38.98326100
7Locked40.36628710
8Locked40.366287210
9Locked40.36628700
10Locked38.983261220
11Locked36.60965300
12Locked36.38689010
13Locked38.98326100
14Locked40.94620970
15Locked38.98326100
16Locked40.36628700
17Locked38.98326100
18Locked38.98326100
19Locked40.36628700
20Locked40.94620900
21Locked40.36628700
22Locked40.36628700
23Locked38.98326100
24Locked38.98326170
25Locked38.98326170
26Locked38.98326100
27Locked38.60537700
28Locked38.98326100
29Locked38.98326100
30Locked38.60537700
 
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kbtang88
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Re: Slow Speed Power Level and SNR 1Gig Hub 4



3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
33964K1880QAM4096424


3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)
33Locked39-3.4548310

 

3.0 Upstream channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
13940000042.7705995120 KSym/sec64QAM2
24620000043.0205995120 KSym/sec64QAM1
33260000042.0205995120 KSym/sec64QAM3
42580000041.2705995120 KSym/sec64QAM4



3.0 Upstream channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1US_TYPE_STDMA0020
2US_TYPE_STDMA0000
3US_TYPE_STDMA0000
4US_TYPE_STDMA0000

 

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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Jodi_S
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

Hi kbtang88,

Thanks for posting on our community forums. Sorry to hear that you're not getting the desired speeds of your 1GB service, we can certainly understand the frustration caused.

Remotely looking from our end, everything seemed OK. Upon further investigation we have checked your power levels and have found that there is indeed and issues with your downstream power level.

Due to this we would need to get an engineer booked out for you to come and take a look at this for you.

I will pop you over a private message, please click on the purple envelope to accept the chat.

Kind regards Jodi. 

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kbtang88
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

What's the power level supposed to be?

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Andrew-G
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

No exact numbers are officially admitted to, but there's some rules of thumb that have a bit of slack to them.  

Basically, you'd want no downstream channel with lower than -5 dBmV, and no higher than +10 dBmV, you'd want the range between them to be less than 4 dBmV, and you'd hope to see the values fairly "flat" or slightly decreasing as the downstream channel number rises.

Normally, to be a recognised power level fault then there needs to be something obviously wrong (eg slow speeds, interruptions or latency problems) in addition to the pure numbers.   

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kbtang88
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

here are the update signal "added signal booster"

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

253310000001.79999938.983261QAM25625
11390000007.90000239.854763QAM2561
21470000007.69999740.366287QAM2562
31550000007.69999740.366287QAM2563
41630000007.00000040.366287QAM2564
51710000006.30000340.366287QAM2565
61790000006.00000038.983261QAM2566
71870000005.80000340.366287QAM2567
81950000005.30000338.983261QAM2568
92030000004.69999738.983261QAM2569
102110000004.30000338.983261QAM25610
112190000003.70000134.345688QAM25611
122270000003.29999936.609653QAM25612
132350000003.50000038.983261QAM25613
142430000003.70000140.366287QAM25614
152510000003.70000140.366287QAM25615
162590000004.00000038.983261QAM25616
172670000003.70000138.983261QAM25617
182750000003.50000038.983261QAM25618
192830000003.09999838.983261QAM25619
202910000002.79999938.983261QAM25620
212990000002.90000238.983261QAM25621
223070000002.70000138.983261QAM25622
233150000002.50000038.983261QAM25623
243230000002.00000038.983261QAM25624
263390000001.29999938.983261QAM25626
273470000000.29999938.605377QAM25627
28355000000-0.29999938.983261QAM25628
29363000000-0.50000038.605377QAM25629
30371000000-0.70000138.605377QAM25630
31379000000-0.79999938.983261QAM25631


3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

25Locked38.98326140
1Locked39.85476300
2Locked40.36628700
3Locked40.36628700
4Locked40.36628700
5Locked40.36628700
6Locked38.98326100
7Locked40.36628700
8Locked38.98326100
9Locked38.98326100
10Locked38.98326120
11Locked34.3456881600
12Locked36.60965320
13Locked38.98326100
14Locked40.36628750
15Locked40.36628700
16Locked38.98326100
17Locked38.98326100
18Locked38.98326100
19Locked38.98326100
20Locked38.98326100
21Locked38.98326100
22Locked38.98326100
23Locked38.98326100
24Locked38.98326100
26Locked38.98326170
27Locked38.60537700
28Locked38.98326100
29Locked38.60537700
30Locked38.60537700
31Locked38.98326100
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kbtang88
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)

33964K1880QAM4096424



3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)

33Locked38-2.515350
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kbtang88
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

3.0 Upstream channels

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

13260000042.7705995120 KSym/sec64QAM3
24620000044.0205995120 KSym/sec64QAM1
33940000043.2705995120 KSym/sec64QAM2
42580000042.0205995120 KSym/sec64QAM4



3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1US_TYPE_STDMA0010
2US_TYPE_STDMA0000
3US_TYPE_STDMA0000
4US_TYPE_STDMA0000

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Andrew-G
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Message 9 of 31
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

The range of downstream power levels is too wide, and appears to be because the "slope" is too steep.  I'm getting to the edges of my limited knowledge, but I believe that slope is set at the signal amplifiers that sit in street cabinets, and it might be that the amp needs setting up again, or perhaps something as simple as switching the tap your connection is on.  I'll mark for staff to take a look and comment.

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Travis_M
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Re: Slow Speed Power Level and SNR 1Gig Hub 4

Hi @kbtang88

 

Thanks for posting on our community forum!

 

I'm going to drop you a private message to collect some more information, please keep an eye on your inbox.

 

Regards

Travis_M
Forum Team



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