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Foxa
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1Gig speeds a bit less than expected

Hello all,

I recently upgraded my 500Mbit connection with volt to 1Gig and a Hub 5, no big problems.I am wondering however, if it's possible to "tweak" things to get the best out of it .

I started out at 100Mbit and went up the ranks from there and at each stage I noticed the actual download speed exceeded my expectations every time, for the 100Mbit I would regulargy get 130_Mbit speed test results, same at 300Mbit and 500Mbit, each time I would see a good 10+20% on top of the stated figures.

When I saw that the bps links peed on the router was at 138000000Hz on the download channel states I had high hopes for the 1Gig also but.. not really there.

Various speed tests at quite times late at night and during the day have resulted in an average of 840-890Mbit, still plenty fast and well over the minimum guaranteed, but it's not quite there.

So, any tips for squeezing that last few hundred Mbits out?

 

I'll include my Router stats that I know how to get, if there is any other hidden data you need let me know hot to get it and I'll post it:

Cable Modem StatusItem Status Comments

Acquired Downstream Channel(Hz)138000000Locked
Ranged Upstream Channel(Hz)49600000Ranged
Provisioning StateOnlineOperational

 

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1138000000-4.339QAM 2561
2146000000-4.339QAM 2562
3154000000-4.339QAM 2563
4162000000-4.339QAM 2564
5170000000-4.439QAM 2565
6178000000-4.340QAM 2566
7186000000-4.140QAM 2567
8194000000-3.840QAM 2568
9202000000-3.840QAM 2569
10210000000-3.540QAM 25610
11218000000-3.440QAM 25611
12226000000-3.440QAM 25612
13234000000-3.340QAM 25613
14242000000-3.440QAM 25614
15250000000-3.641QAM 25615
16258000000-3.741QAM 25616
17266000000-3.241QAM 25617
18274000000-3.141QAM 25618
19282000000-2.941QAM 25619
20290000000-2.941QAM 25620
21298000000-341QAM 25621
22306000000-3.141QAM 25622
23314000000-3.141QAM 25623
24322000000-3.241QAM 25624
25330000000-3.341QAM 25625
26338000000-3.240QAM 25626
27346000000-3.441QAM 25627
28354000000-3.740QAM 25628
29362000000-3.541QAM 25629
30370000000-3.640QAM 25630
31378000000-3.540QAM 25631

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked3933531772216
2Locked39173510676779
3Locked3936811699
4Locked3935881815
5Locked3935131033
6Locked4052902014
7Locked4015061396
8Locked4013041364
9Locked4011661559
10Locked4017451890
11Locked4017541562
12Locked4019522899
13Locked40678633
14Locked4013491498
15Locked4111401601
16Locked418921338
17Locked41396539
18Locked419521493
19Locked418791345
20Locked4123061642
21Locked4129251688
22Locked4122301041
23Locked4134851809
24Locked4126251560
25Locked4123741417
26Locked40807478
27Locked4110371175
28Locked40573542
29Locked4112011345
30Locked40469495
31Locked40689912

 

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
049600000565120QAM 641
14310000055.85120QAM 642
23660000055.35120QAM 643
33010000055.35120QAM 644
42360000054.55120QAM 649

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
0ATDMA0000
1ATDMA0000
2ATDMA0000
3ATDMA0010
4ATDMA0000

General Configuration

Network accessMaximum Number of CPEsBaseline PrivacyDOCSIS ModeConfig file
Allowed
1
Enabled
3.1
cmreg-vmdg660-bbt076-b.cm

Primary Downstream Service Flow

SFIDMax Traffic RateMax Traffic BurstMin Traffic Rate
158076
1230000450 bps
42600bytes
0 bps

Primary Upstream Service Flow

SFIDMax Traffic RateMax Traffic BurstMin Traffic RateMax Concatenated BurstScheduling Type
158075
55000270 bps
42600bytes
0 bps
42600bytes
Best Effort
 
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Foxa
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Re: 1Gig speeds a bit less than expected

Thought I'd include the Log

Network Log

Time Priority Description
28-02-2023 10:21:03noticeCM-STATUS message sent. Event Type Code: 24; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:19:06noticeCM-STATUS message sent. Event Type Code: 24; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:18:57noticeCM-STATUS message sent. Event Type Code: 22; Chan ID: 33; 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;
28-02-2023 10:17:06noticeCM-STATUS message sent. Event Type Code: 16; Chan ID: 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:17:06noticeCM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 33; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.
28-02-2023 10:17:06noticeCM-STATUS message sent. Event Type Code: 5; Chan ID: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;C
28-02-2023 10:17:06noticeCM-STATUS message sent. Event Type Code: 20; Chan ID: 33; 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;
28-02-2023 10:17:06noticeCM-STATUS message sent. Event Type Code: 23; Chan ID: 33; 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;
28-02-2023 10:16:39warningRCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:16:16criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:16:11warningMDD message timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:16:06criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:16:05warningMDD message timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-02-2023 10:16:05criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 14:58:30noticeREGISTRATION COMPLETE - Waiting for Operational status
27-02-2023 14:58:22noticeDS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 14:58:10warningDHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 14:58:08noticeHonoring MDD; IP provisioning mode = IPv4
27-02-2023 14:58:01criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 14:57:56criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 14:57:43criticalCable Modem reboot from UI
27-02-2023 14:43:28criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 14:43:17criticalCable Modem Reboot due to power button reset
27-02-2023 13:20:42criticalDHCP FAILED - Discover sent, no offer received;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:20:27criticalDHCP FAILED - Critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:20:26criticalDHCP FAILED - Discover sent, no offer received;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:13:21criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:11:17criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:11:17criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:11:13criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
27-02-2023 13:11:00criticalCable Modem Reboot due to SW Upgrade
27-02-2023 13:04:34criticalCable Modem Reboot from SNMP
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Client62
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Helpful Answer

Re: 1Gig speeds a bit less than expected

A single 1000Mb/s or 1Gb/s network connection has a transfer limit of about 940Mb/s.

To reach the full 1140Mb/s speed on a single device the connection is going to have to be made at 2.5Gb/s.

This perhaps means adding a 2.5Gb/s network adaptor to the computer.

As the computer is already topping out at 840-890Mb/s there may not be any more speed to be had.

If your VM Hub is in Router mode this link will show the service speed at the Hub : https://www.samknows.com/realspeed/

Foxa
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Re: 1Gig speeds a bit less than expected

Foxa_0-1677588395202.png

Interesting, thank you very much for the info, soo.... the hub seem to be right on the money speed wise, it's my dinosaw networking kit that needs a revamp..... OK, That I can do, thanks!

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Foxa
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Re: 1Gig speeds a bit less than expected

Just as a side note, I unplugged the network cable and used wifi... got 1109Mbit heh.

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carl_pearce
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Re: 1Gig speeds a bit less than expected

I'd suggest your upstream power levels are a touch high, which could be causing an inconsistent connection.

You wouldn't really expect to see any, maybe the odd one, 'Post RS Errors' either.

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Foxa
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Re: 1Gig speeds a bit less than expected

Ok, are the post RS error typically a sign of something? I know I had an engineer out a while back who said my signal levels were a little low, basically flat after flat in my building have been spurred off the same cable with passive splitters.

I take it my slightly low -4dbm inbound is in keeping with the slightly high outbound, i.e. lower than idea signal.

Any suggestions?.
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Foxa
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Re: 1Gig speeds a bit less than expected

I did a reboot at 6pm and this was the download report at 8:40pm

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked39150
2Locked39141
3Locked3900
4Locked4010
5Locked4010
6Locked4010
7Locked4020
8Locked40810
9Locked4010
10Locked4070
11Locked40513
12Locked4079
13Locked41190
14Locked41120
15Locked4100
16Locked4100
17Locked4110
18Locked4190
19Locked4100
20Locked4100
21Locked4100
22Locked4100
23Locked4110
24Locked4110
25Locked4100
26Locked4100
27Locked4100
28Locked4100
29Locked4100
30Locked4100
31Locked4110
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carl_pearce
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Re: 1Gig speeds a bit less than expected

VM will respond to this thread in a few days, and will advise if an engineer visit is required.

For now you are getting a least decent speeds.

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Foxa
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Re: 1Gig speeds a bit less than expected

OK, thanks.
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