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toms88
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SH4 Slow Speeds (Modem / Router mode)

I recently upgraded from M350 to 1GIG with the SH4. I have always used my own routers, in the past i had a PFSense custom router which was giving me no end of issues in 2020 after some SH3 fw update. I ended up getting a Ubiquiti EdgeMax router which was working fine, getting the full speeds.

 

Since getting the SH4 i immediately went to modem mode and hooked it up. Im now on average getting around 120-300Mb download speeds when its in modem mode. I have reverted to router mode to do some more tests. The best ive gotten in router mode is about 450Mbs but no more.

 

Obviously when i call VM support im told sorry, thats your problem we dont support that type of setup. Any tips from other SH4 users?

 

I should also mention that after going back to router mode the SH4 responds on both 192.168.100.1 and 192.168.0.1 which seems odd? This is with my direclty connected via ethernet to the Sh4

Below are the details from the SH while its in router mode. Given they wont help me with my own router setup, i guess there is still an issue since im getting less than half while in router mode?

 

Cable Modem Status
Item	Status	Comments
Cable Modem Status	
Online
DOCSIS 3.1
Primary downstream channel	
Locked
SC-QAM
Channel Overview	Downstream	Upstream
DOCSIS 3.0 channels	
31
4
DOCSIS 3.1 channels	
1
0

 

 

 

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
25	330750000	1.8	40.4	QAM256	25
6	178750000	2.7	40.4	QAM256	6
7	186750000	2.6	40.4	QAM256	7
8	194750000	2.7	40.9	QAM256	8
9	202750000	2.4	40.4	QAM256	9
10	210750000	2.5	40.9	QAM256	10
11	218750000	2.2	40.9	QAM256	11
12	226750000	2.4	40.9	QAM256	12
13	234750000	2.3	40.4	QAM256	13
14	242750000	2.5	40.4	QAM256	14
15	250750000	2.2	40.4	QAM256	15
16	258750000	2.2	40.4	QAM256	16
17	266750000	1.8	40.4	QAM256	17
18	274750000	1.9	40.4	QAM256	18
19	282750000	2.1	40.9	QAM256	19
20	290750000	2.2	40.9	QAM256	20
21	298750000	2.1	40.4	QAM256	21
22	306750000	1.9	40.4	QAM256	22
23	314750000	1.8	40.4	QAM256	23
24	322750000	1.7	40.4	QAM256	24
26	338750000	1.9	40.4	QAM256	26
27	346750000	2	40.4	QAM256	27
28	354750000	1.8	40.4	QAM256	28
29	362750000	2	40.4	QAM256	29
30	370750000	1.9	40.9	QAM256	30
31	378750000	2.1	40.4	QAM256	31
32	386750000	2.2	40.4	QAM256	32
33	394750000	2.2	40.4	QAM256	33
34	402750000	2	40.4	QAM256	34
35	410750000	1.9	40.4	QAM256	35
36	418750000	2	40.4	QAM256	36


3.0 Downstream channels
Channel	Lock Status	RxMER (dB)	Pre RS Errors	Post RS Errors
25	Locked	40.366287	1	0
6	Locked	40.366287	0	0
7	Locked	40.366287	0	0
8	Locked	40.946209	8	0
9	Locked	40.366287	0	0
10	Locked	40.946209	0	0
11	Locked	40.946209	0	0
12	Locked	40.946209	0	0
13	Locked	40.366287	0	0
14	Locked	40.366287	0	0
15	Locked	40.366287	0	0
16	Locked	40.366287	0	0
17	Locked	40.366287	0	0
18	Locked	40.366287	0	0
19	Locked	40.946209	0	0
20	Locked	40.946209	0	0
21	Locked	40.366287	1	0
22	Locked	40.366287	1	0
23	Locked	40.366287	1	0
24	Locked	40.366287	1	0
26	Locked	40.366287	0	0
27	Locked	40.366287	0	0
28	Locked	40.366287	1	0
29	Locked	40.366287	0	0
30	Locked	40.946209	1	0
31	Locked	40.366287	1	0
32	Locked	40.366287	0	0
33	Locked	40.366287	1	0
34	Locked	40.366287	2	0
35	Locked	40.366287	1	0
36	Locked	40.366287	0	0


3.1 Downstream channels
Channel	Channel Width (MHz)	FFT Type	Number of Active Subcarriers	Modulation (Active Profile)	First Active Subcarrier (Hz)
37	94	4K	1840	QAM4096	424


3.1 Downstream channels
Channel ID	Lock Status	RxMER Data (dB)	PLC Power (dBmV)	Correcteds (Active Profile)	Uncorrectables (Active Profile)
37	Locked	42	1.7	2817011	0
Refresh data
3.0 Upstream channels
Channel	Frequency (Hz)	Power (dBmV)	Symbol Rate (ksps)	Modulation	Channel ID
1	46200000	47.5	5120 KSym/sec	64QAM	3
2	39400000	47.3	5120 KSym/sec	64QAM	4
3	25800000	46.3	5120 KSym/sec	32QAM	11
4	32600000	46.8	5120 KSym/sec	64QAM	5


3.0 Upstream channels
Channel	Channel Type	T1 Timeouts	T2 Timeouts	T3 Timeouts	T4 Timeouts
1	US_TYPE_STDMA	0	0	0	0
2	US_TYPE_STDMA	0	0	0	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	0	0
Refresh data
Network Log
Time	Priority	Description
Thu 01/01/1970 00:01:28	3	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat 18/12/2021 10:26:35	5	MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;

 

 

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carl_pearce
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Re: SH4 Slow Speeds (Modem / Router mode)

Other than one of your upstream channels being on 32QAM, rather than the expected 64QAM, I can't see any issues with the stats.

Could you try a full 30 second reset (Press and hold pin hole for at least 30 seconds), put the HUB back into modem mode, and try again?

If this doesn't fix it put your HUB back into router mode and try the below site to see the actual speed reaching your HUB:

https://samknows.com/realspeed/

 

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toms88
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Re: SH4 Slow Speeds (Modem / Router mode)

Quite disappointing to see that on router mode via that particular speedest its showing 1125Mb download. 

I really hate how modem users get screwed like this. My SH3 was at least giving me what i paid for at often 350mb download.

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carl_pearce
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Re: SH4 Slow Speeds (Modem / Router mode)


@toms88 wrote:

Quite disappointing to see that on router mode via that particular speedest its showing 1125Mb download. 

I really hate how modem users get screwed like this. My SH3 was at least giving me what i paid for at often 350mb download.


I can get full speed in modem mode using my own kit, so you should be able to see at least 940Mbps (1Gbps ethernet limitation):

 

Could you try one device connected to the HUB in modem mode (Ensure all other ethernet devices are disconnected) to check it isn't your kit causing an issue?

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