50M How do these look?

chambohambo · 17-01-2015, 22:47

Downstream
DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 299000000 283000000 291000000 307000000 315000000 323000000 N/A N/A
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked Unlocked Unlocked
Channel ID 3 1 2 4 5 6 N/A N/A
Modulation 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM Unknown Unknown
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 N/A N/A
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 N/A N/A
Power Level (dBmV) -5.29 -4.87 -4.87 -5.55 -6.18 -6.61 N/A N/A
RxMER (dB) 37.94 37.64 37.94 37.36 37.36 37.09 N/A N/A
Pre RS Errors 32540483 51270654 41635569 28920523 53931909 45195304 N/A N/A
Post RS Errors 292723 296245 488109 370006 611941 587613 N/A N/A

Upstream
US-1 US-2 US-3 US-4
Channel Type 2.0 N/A N/A 2.0
Channel ID 42 N/A N/A 41
Frequency (Hz) 35800000 N/A N/A 45800000
Ranging Status Success Other Other Success
Modulation 16QAM N/A N/A 16QAM
Symbol Rate (Sym/sec) 5120000 N/A N/A 5120000
Mini-Slot Size 4 N/A N/A 4
Power Level (dBmV) 40.21 N/A N/A 42.25
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 5 0 0 2
T4 Timeouts 0 0 0 0

jb66 · 17-01-2015, 22:56

Your downstream is a little low, do you have an attenuator on the hub?

chambohambo · 18-01-2015, 15:01

Hi jb66,

Thanks for replying back to my post. I can confirm there is no attenuator on the super hub 2 or tivo box.

jb66 · 18-01-2015, 15:11

You must have a really long cable for the upstream to be low as well as the downstream. I guess if the downstream drops any more it might be worth calling up to get a tech to have a look

chambohambo · 18-01-2015, 16:27

Hi jb66,

Thanks for replying back to my post. The problem my friend is facing is the tv picture breaks up intermittently I take it this is because the downstream power level is on the low side, also looking on the super hub 2 at the logs there are lots of t3 errors. My friend is about I would say 200 metres from the cabinet, I am guessing if a techie came out and moved the cable up a tap then the upstream power level then would drop wouldn't it? Which also would cause problems am guessing.

jb66 · 18-01-2015, 19:59

Quote:

Originally Posted by chambohambo

Hi jb66,

Thanks for replying back to my post. The problem my friend is facing is the tv picture breaks up intermittently I take it this is because the downstream power level is on the low side, also looking on the super hub 2 at the logs there are lots of t3 errors. My friend is about I would say 200 metres from the cabinet, I am guessing if a techie came out and moved the cable up a tap then the upstream power level then would drop wouldn't it? Which also would cause problems am guessing.

Sounds like he might need an RG11 cable repull, -6 is what he is getting at 323mhz, he is probably getting around -12 at 715mhz which would mean certain channels will be pixelating.

It looks like he is already on the highest tap port as his upstream is quite low

Sephiroth · 18-01-2015, 22:16

Is the upstream power on US-1 fluctuating and moving upward?

chambohambo · 19-01-2015, 22:05

Hi jb66 and Sephiroth,

Thanks for you both replying to my post. Here are the downstream and upstream power levels today.

Downstream DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 299000000 283000000 291000000 307000000 315000000 323000000 N/A N/A
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked Unlocked Unlocked
Channel ID 3 1 2 4 5 6 N/A N/A
Modulation 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM Unknown Unknown
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 N/A N/A
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 N/A N/A
Power Level (dBmV) -5.37 -4.94 -4.94 -5.53 -6.04 -6.49 N/A N/A
RxMER (dB) 37.94 37.36 37.94 37.36 37.64 37.36 N/A N/A
Pre RS Errors
46210211 71075741 54366191 39812100 67207865 56146644 N/A N/A
Post RS Errors
360318 365201 552056 443071 680030 652213 N/A N/A

Upstream US-1 US-2 US-3 US-4
Channel Type 2.0 N/A N/A 2.0
Channel ID 42 N/A N/A 41
Frequency (Hz) 35800000 N/A N/A 45800000
Ranging Status Success Other Other Success
Modulation 16QAM N/A N/A 16QAM
Symbol Rate (Sym/sec) 5120000 N/A N/A 5120000
Mini-Slot Size 4 N/A N/A 4
Power Level (dBmV) 40.21 N/A N/A 42.25
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 5 0 0 2
T4 Timeouts 0 0 0 0

Sephiroth · 19-01-2015, 23:12

If you refresh the upstream stats screen, what is US-1 doing? The 40.21 reading suggests power adjustments.

chambohambo · 22-01-2015, 00:10

Hi Sephiroth,

Thanks for replying back to my post. My friend has rang Virgin Media and has an engineer appointment this week. What should the downstream and upstream power levels be?

Sephiroth · 22-01-2015, 06:34

Downstream should be between -4 and +9

Upstream should be anything below 54 dBmv but it's heading for issues if over 50 dBmv. If the upstream power is not divisible by 0.25, then power adjustments are occurring and you have potential issues.

chambohambo · 22-01-2015, 21:24

Hi Sephiroth,

Thanks for replying back to my post. My friend had an engineer out today. How do the downstream and upstream power levels now look?

Downstream
DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 299000000 283000000 291000000 307000000 315000000 323000000 N/A N/A
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked Unlocked Unlocked
Channel ID 3 1 2 4 5 6 N/A N/A
Modulation 256QAM 256QAM 256QAM 256QAM 256QAM 256QAM Unknown Unknown
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 N/A N/A
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17 N/A N/A
Power Level (dBmV) 1.12 1.34 1.55 0.89 0.34 -0.06 N/A N/A
RxMER (dB) 38.26 37.94 38.26 37.94 38.26 38.26 N/A N/A
Pre RS Errors 592 1718 412 996 1032 345 N/A N/A
Post RS Errors 293 271 282 955 1010 289 N/A N/A

Upstream
US-1 US-2 US-3 US-4
Channel Type 2.0 N/A N/A 2.0
Channel ID 42 N/A N/A 41
Frequency (Hz) 35800000 N/A N/A 45800000
Ranging Status Success Other Other Success
Modulation 16QAM N/A N/A 16QAM
Symbol Rate (Sym/sec) 5120000 N/A N/A 5120000
Mini-Slot Size 4 N/A N/A 4
Power Level (dBmV) 38.00 N/A N/A 40.00
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 0 0 0 0
T4 Timeouts 0 0 0 0

Sephiroth · 22-01-2015, 21:30

Look fine to me. What did he do? Remove an attenuator?

chambohambo · 22-01-2015, 22:19

Hi Sephiroth,

Thanks for replying back to my post. My friend said the engineer moved the cable to another tap.