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Network Log

Hi These have come up a couple of times in the last few dayson my Network Log  Can any of the forum experts tell me what they mean ?  Two of them are marked critical.  Thanks

 

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

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Re: Network Log

They don't mean much without data to match them up with.

Type 192.168.0.1 into your browser URL bar and press enter.  When the page appears DO NOT LOG IN but click ‘Check Router Status’. Copy and paste the contents of each tab onto here, a Guru will be along soon to decipher the info.

***********************************************************************************************************************************

Mike Robinson
Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.


My Broadband Ping - 26_Aug_2020
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Re: Network Log

Thanks Will do
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Re: Network Log

Cable Modem Status
Item
Status
Comments
Acquired Downstream Channel (Hz)
483000000
Locked
Ranged Upstream Channel (Hz)
60300000
Locked
Provisioning State
Online

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Re: Network Log


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Home

Connected devices

Modem mode

Advanced settings

Wireless

Security

DHCP

UPnP

Tools

Network status
Ping
Traceroute
MTU size
Admin


Network status

Router status
Status
Downstream
Upstream
Configuration
Network Log

 

Refresh data
Downstream bonded channels
Channel
Frequency (Hz)
Power (dBmV)
SNR (dB)
Modulation
Channel ID
1
483000000
1.7
37
256 qam
30
2
187000000
1.2
37
256 qam
7
3
195000000
1.4
38
256 qam
8
4
203000000
1.5
38
256 qam
9
5
211000000
1.2
38
256 qam
10
6
219000000
1.2
38
256 qam
11
7
227000000
1.4
38
256 qam
12
8
235000000
1.5
38
256 qam
13
9
243000000
1
38
256 qam
14
10
251000000
1.2
38
256 qam
15
11
259000000
1
38
256 qam
16
12
267000000
1.5
38
256 qam
17
13
275000000
1.5
38
256 qam
18
14
283000000
1.7
38
256 qam
19
15
291000000
2
38
256 qam
20
16
299000000
2.2
38
256 qam
21
17
307000000
2
38
256 qam
22
18
315000000
1.9
38
256 qam
23
19
323000000
2
37
256 qam
24
20
443000000
2.2
37
256 qam
25
21
451000000
2.5
37
256 qam
26
22
459000000
2.5
37
256 qam
27
23
467000000
2
37
256 qam
28
24
475000000
1.7
37
256 qam
29


Downstream bonded channels
Channel
Locked Status
RxMER (dB)
Pre RS Errors
Post RS Errors
1
Locked
37.3
17
0
2
Locked
37.6
6
0
3
Locked
38.6
5
0
4
Locked
38.6
5
0
5
Locked
38.6
6
0
6
Locked
38.6
5
0
7
Locked
38.9
4
0
8
Locked
38.6
8
0
9
Locked
38.6
0
0
10
Locked
38.6
7
0
11
Locked
38.6
0
0
12
Locked
38.9
5
0
13
Locked
38.9
9
0
14
Locked
38.9
7
0
15
Locked
38.6
5
0
16
Locked
38.6
7
0
17
Locked
38.6
5
0
18
Locked
38.6
6
0
19
Locked
37.6
1
0
20
Locked
37.6
12
0
21
Locked
37.3
26
0
22
Locked
37.3
14
0
23
Locked
37.3
19
0
24
Locked
37.3
24
0

 

 

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Re: Network Log


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Home

Connected devices

Modem mode

Advanced settings

Wireless

Security

DHCP

UPnP

Tools

Network status
Ping
Traceroute
MTU size
Admin


Network status

Router status
Status
Downstream
Upstream
Configuration
Network Log

 

Refresh data
Upstream bonded channels
Channel
Frequency (Hz)
Power (dBmV)
Symbol Rate (ksps)
Modulation
Channel ID
1
60300000
3.925
5120
64 qam
13
2
39400000
3.85
5120
64 qam
16
3
46200000
3.85
5120
64 qam
15
4
53700000
3.9
5120
64 qam
14


Upstream bonded channels
Channel
Channel Type
T1 Timeouts
T2 Timeouts
T3 Timeouts
T4 Timeouts
1
ATDMA
0
0
0
0
2
ATDMA
0
0
0
0
3
ATDMA
0
0
0
0
4
ATDMA
0
0
0
0

 

 

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Re: Network Log


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Home

Connected devices

Modem mode

Advanced settings

Wireless

Security

DHCP

UPnP

Tools

Network status
Ping
Traceroute
MTU size
Admin


Network status

Router status
Status
Downstream
Upstream
Configuration
Network Log

 

Refresh data
General Configuration
Network access
Allowed
Maximum Number of CPEs
1
Baseline Privacy
Enabled
DOCSIS Mode
Docsis30
Config file
cmreg-vmdg505-rtsxl20016u-b.cm


Primary Downstream Service Flow
SFID
1118224
Max Traffic Rate
230000061
Max Traffic Burst
42600
Min Traffic Rate
0


Primary Upstream Service Flow
SFID
1118223
Max Traffic Rate
22000061
Max Traffic Burst
42600
Min Traffic Rate
0
Max Concatenated Burst
42600
Scheduling Type
BestEffort

 

 

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Re: Network Log


@rifleman wrote:

Hi These have come up a couple of times in the last few dayson my Network Log  Can any of the forum experts tell me what they mean ?  Two of them are marked critical.  Thanks

 

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;


I can certainly tell you what the messages actually mean if you like, but it's not uncommon to get a couple of these periodically, it's only an issue if they are occurring very frequently (many times a day) and/or you are having issues with your internet connection. The DOCSIS (cable internet) technology is actually designed to be very tolerant of faults and intermittent partial drops - although the hub logs when an error occurs, it doesn't subsequently log all of the succeeding successful connections, so just looking through the Hub logs can easily make you think that something is critically wrong when actually it was just a momentary blip.

For example, your last error message regarding the T3 timeout. The cable modem in the VH hub requires constant tiny adjustments to timing and slight changes to channel frequencies etc. This is referred to as 'ranging' and every 20-30 seconds or so the Hub sends out a ranging request message back to VM's infrastructure (the CMTS). The DOCSIS specs say that it should receive a response back within a quarter of a second and if it doesn't (momentary interference, the CMTS was just a bit too busy etc), it logs a T3 error - literally no ranging response (RNG-RSP) received. It then resets its timer and tries again at the next ranging interval. Only if it misses 16 consecutive responses does it realize that something has gone wrong and it may well have lost a channel and needs to reconfigure itself.

The important thing is that see a scary looking error message but don't see the fact that after that one it was fine for days afterwards!

Just for completion, because of the way that digital information is encoded into the signal being sent down the cable, that it is vitally important that the VM hub and the CMTS remain in sync time-wise and to that end there are periodic timing signals sent to keep everything locked together. Sync Timing Synchronization failure is just that, it's (temporarily) lost its timing lock.

The hub will have been told (for example) that it should have 24 downstream channels at 256 QAM and 4 upstream at 64 QAM - sometimes because of a bit of noise, bad connection, faulty hub, it can lose a channel or have to downgrade one or more of the upstream channels to 32 or 16 QAM in an attempt to at least keep the connection up albeit with reduced performance. RCS (Receive Channel Set) partial service, as the name suggests!

Like I said, what you don't see is the hub picking itself up afterwards and working properly - so don't get too hung up on see these from time to time.

Now, of course if you have a lot of them and/or a real internet connectivity issue, then that's another matter! 

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Re: Network Log You

Thank You for the very detailed reply  I am only asking as I have recently increased our broadband to 200mb and am not really seeing any benefit. I have  5 bars from a BT extender so strong signal but on Speedtest.Net only getting between 10 to 20 mb download speed on a two year old laptop.  I appreciate that there are other factors involved with wirless connections but am only sitting approximately 15 feet from router .  By the way I only have one bar from router itself.  Again thanks for the reply.

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Re: Network Log You

First thing is to checked wired speeds. With a wired connection to the hub what speeds do you get using speedtest.net?

--
Hub 3.0, TP-Link Archer C8, TP-Link TL-SG1008D 8-port gigabit switch, V6
My Broadband Ping - Roger's VM Broadband Connection
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