Cable Forum - 100M T3 Timeout

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- - 100M : T3 Timeout (https://www.cableforum.uk/board/showthread.php?t=33687485)

Hi agreed low upstream should not be a problem, as the
Cmts should manage those levels and request a higher upstream.

But for whatever reason since they dropped down to 34.8 I started recieving t3 errors.

The reason they dropped seems to coincide with the upgrades and maintenance.. Like I'd read vm sent all their engineers out tightening up the connections In cabinets and things properly.

And I get any tired amps and nodes have also been replaced as part of the upgrades.

Which is why the cmts started requesting a lower upstream power.

I've now removed the hdu and put in a 4 way and 2 way splitter.. 1 on each drop cable.. Will replace though with 2x 3 ways if the t3 errors go away so I have even signal levels around the house.

But upstream is now 41 currently will see if that drops any more

Quote:

Originally Posted by craigj2k12 (Post 35424129)

Was this a subtle hint? ;)

are we going to see 4 upstreams on 32/64QAM?

No and yes, eventually, respectively.

Quote:

Originally Posted by Ignitionnet (Post 35424121)

No modem goes above 61.21.

My bad, I knew it was somewhere around 62-ish...

Quote:

On VM's DOCSIS 3 network no modem should go to 58.21, once upstream bonding is implemented this drops further to 55.21 for 2 x 16QAM channels and 52.21 for 4.
They go to 32 or 64QAM take another 1.21dBmV off this.

In that case, the current recommended range of up to 55 is not only incredibly close to the absolute limit already, but will be beyond it soon.

So my guess is the recommended range should change to no more than 50dB now, and 45dB for bonded 64-QAM.

Quote:

Originally Posted by Ignitionnet (Post 35424121)

I use a bidirectional adjustable attenuator to manage mine.

Is that something he can buy and do himself or would he best ringing up and getting them to take a look at it?

I've been monitoring my
Connection with the hdu removed and upstream at 41 dBmV

And... Im still receiving T3 errors

I guess this is now looking like a networks fault.

if your power levels are within spec and everything is working alright I wouldnt worry about it. I get the occasional T3 error but I never notice it because my connection is pretty much 100%

Where possible I prefer to fix myself, the engineers around here just lie to me and fob me off. :(

I always use same stuff as vm use, and do to the same standard.. From splitters to triple shielded cable using the same identical f connectors.

Signal levels were perfect until they started doing network work, I've now removed the hdu as the network downstream levels had creeped up slightly, which is how I got the 41dB upstream, as the splitter is now attenuating it.

But still getting the T3 errors

Nothing has changed on my
Installation so it's nothing here I don't think, it was error free for months.

---------- Post added at 07:07 PM ---------- Previous post was at 07:05 PM ----------

It's not occasional though it's several times a day at present :(

still getting lots of T3 errors :(

connection in terms of downstream is about as perfect as it will get, and upstream is better now.

Connection
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 315000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
Downstream Channels
Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis locked
Locked QAM256 38 55616000 Kbits/sec 315000000 Hz 2.0 dBmV 42.9 dB Hybrid
Locked QAM256 33 55616000 Kbits/sec 283000000 Hz 1.5 dBmV 42.9 dB Hybrid
Locked QAM256 34 55616000 Kbits/sec 291000000 Hz 1.3 dBmV 42.8 dB Hybrid
Locked QAM256 35 55616000 Kbits/sec 299000000 Hz 1.2 dBmV 42.6 dB Hybrid
Locked QAM256 37 55616000 Kbits/sec 307000000 Hz 0.6 dBmV 42.5 dB Hybrid
Locked QAM256 39 55616000 Kbits/sec 323000000 Hz 1.6 dBmV 43.0 dB Hybrid
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown
Upstream Channels
Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power
Locked ATDMA 1 20480 Kbits/sec 35800000 Hz 41.3 dBmV
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Primary Downstream Service Flow
Downstream(0)
SFID 1252
Max Traffic Rate 110000000 bps
Max Traffic Burst 10000 bytes
Mix Traffic Rate 0 bps
Primary Upstream Service Flow
Upstream(0)
SFID 1251
Max Traffic Rate 10250000 bps
Max Traffic Burst 16320 bytes
Mix Traffic Rate 0 bps
Max Concatenated Burst 16320 bytes
Scheduling Type Best Effort
Current System Time:Sun May 06 22:03:46 2012

those power levels are perfect. Have you run some speed tests or done any downloads to see what you get?

I also get T3 timeouts but I noticed that my US power was all over the place.

http://www.cableforum.co.uk/board/at...1&d=1336376418

What can cause this sort of variation? Can this lead to T3s?

Hi I know they are perfect lol, it took me a lot of hastle last year to get them to that.

This is why I'm sure this is a network problem, my signal levels are fine :)

just setup a broadband monitor.

looks like im getting some packet loss also

https://www.cableforum.co.uk/images/...2012/05/48.png

Seems to be behaving so far, I'll see what happens later this evening
http://www.thinkbroadband.com/ping/s...08-05-2012.png

just been sent a replacement superhub, still getting Timeout errors though and small packet loss :(

https://www.cableforum.co.uk/images/...2012/05/15.png

Apart from when you just set up the chart, I see virtually zero packet loss on your chart.