Expert

Re: How is it possible...

225' from the pole needs a helper pole inbetween, else the line has stretched and impedance is bad... 100-125' is the max on rg6 with messenger, without a helper pole.

Even with good line, I'd prefer to see rg11.

How close are tree branches, normally the squirells and raptors sit on a branch and chew the line.

 

Expert

Re: How is it possible...

TWC/ spectrum doesn't trim trees, you need to do that yourself unless they're on the street easement.

 

Valued Participant

Re: How is it possible...

There is a pole on my property, roughly half way between the house and the pole on the road.  Will report back with best guess at cable size.

 

Tree branches get fairly close, but not many (if any) squirrels... the dog and the cats take care of them and rabbits.  We don't see many of either on the property.

Expert

Re: How is it possible...

The level should not have dropped that much in a year, it needs twc out to replace whatever failed, it will only get worst.

 

Valued Participant

Re: How is it possible...

cold and snow all day, didn't get out to look at the line.  Speed back down sub 4Mbps today and SNR back down to 28db.

 

Hope it warms up tomorrow so I can go out and see if anything obvious is visible

Spectrum Employee

Re: How is it possible...

"If you're internet only, there should be no splitters and DS should be in the 0 to + 15 dBmv range" Fixed, just to be more accurate. And actually really it should be above +0 if it's a single line with no splitters from the tap. +15 is what most modem & cable boxes are designed for (all the ones we rent and most of the modem you can buy, most manufactures say -15 to +15; but really below -10 is a bad idea because the signal isn't that perfectly clean of noise in most real-world situations). It just depends on attenuation due to distance. Drop-relief is usually needed if >300 ft, at least in my market area. Love using RG11 for drops, gives people more signal. Would rather have more forward signal than not enough (although not like +44 dBmV like I saw for one customer last week, that's definitely too much). It's not uncommon for higher-value taps to start out around 18 to 20 dBmV. So if it's a short drop from a high-value tap, it's gonna be a bit strong and that's is what it is. In short, for the opening post of this topic, I would prefer +10 over -7 for receiving/Rx/forward signal power at the CPE/modem all day every day.
My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Spectrum Employee

Re: How is it possible...

Not sure what happened to the formatting in the above post... it wasn't a wall of text when I wrote it...
My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Expert

Re: How is it possible...

The correct spec for modems in the real world on an HFC  all qam  system running qam 256  is DS level of -8 to +8 dBmv. If you're seeing over + 10 coming in, their ether needs to be an attenuator or a properly terminated splitter in line, if the levels over + 15 the outside tapoff and amplifiers have issues and it can't be cleaned up in the house by attenuating the signal.

You can't run over +10  and have 500+ mHz of QAM only bandwidth and thru a fiber to Coaxial (HFC) connection, It usually  pushes channel  s/n down below 35 dB. 

 The street amps here are set for +30 dBmv outputs, I'm on a 26 dB tapoff bolted right on the amp, with +4 leaving the pole. After the drop and a 2 way splitter, I have around 0 dBmv

Valued Participant

Re: How is it possible...

Shortly after posting the earlier messages, my modem stopping picking up channel 6 and I have been back up to full speed.  I realize this doesn't mean the problem is fixed, but only avoided for the time being and will come back.  However, I can't really call TWC/Spectrum for a repair call when it's working, so I'll have to wait for it to go down again.

 

FWIW, what I'm getting now:

 

DownstreamBonding Channel Value
Channel ID10 11 12 13 14 15 16 
Frequency705000000 Hz 711000000 Hz 717000000 Hz 723000000 Hz 729000000 Hz 735000000 Hz 741000000 Hz 747000000 Hz 
Signal to Noise Ratio36 dB 36 dB 36 dB 36 dB 36 dB 37 dB 37 dB 37 dB 
Downstream ModulationQAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
-7 dBmV  -8 dBmV  -8 dBmV  -8 dBmV  -8 dBmV  -7 dBmV  -7 dBmV  -7 dBmV  

 

UpstreamBonding Channel Value
Channel ID18 20 19 17 
Frequency24200000 Hz 37000000 Hz 30600000 Hz 19400000 Hz 
Ranging Service ID11724 11724 11724 11724 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level45 dBmV 47 dBmV 46 dBmV 45 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID10 11 12 13 14 15 16 
Total Unerrored Codewords3909707996 3909723607 3909715421 3909699150 3909689298 3909690911 3909691979 3909692793 
Total Correctable Codewords17 23 51 17 
Total Uncorrectable Codewords670 1425 1422 1334 1549 1452 1399 1602 
Established Sharer

Re: How is it possible...

You don't need to wait to call Spectrum for a service visit until when your internet is failed.  Print out the event log and signal level reports for both cases 'DS6 assigned, everything sucks', and for 'No DS6, no problems'.  Then hand them to the tech when he shows up and tell him "THIS is the problem you have to fix."  The problem is still there with DS6 even if your modem is not assigned to use it.