Modem Levels
 

Hi,

I'm running my modem off a splitter initially installed in my old place by telewest. It has the modem / tv box connected and I was wondering if the levels given are what is causing me to get somewhat poor performance, can anyone offer their advice? It's an SB5101e based in Lanarkshire.

Thanks

downstream
Frequency 331000000 Hz
Signal To Noise Ratio 41.4 dB
Power Level 4.2 dBmV

upstream
Channel ID 4
Frequency 29200000 Hz
Power 58.0 dBmV

Re: Modem Levels
 

the 58dbmv power level is high,this denotes (simply put) how hard your modem is having to try to connect to the network.it will go to 61dbmv then start to try again,so could be you need the levels upping from the cab,which would see the rtn path power level drop down.i.e. it wont be trying as hard to connect,any downward fluctuation in the levels off the amp will probably cause the modem to drop off when its this high.hope this helps. ;)

Re: Modem Levels
 

Call faults as your levels need looking at :)

Re: Modem Levels
 

thanks folks

Re: Modem Levels
 

Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 2
Upstream Frequency : 37500000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 48.0 dBmV
Upstream Mini-Slot Size : 2

What about mine anyone please?

Re: Modem Levels
 

Ned would you be able to look at mine for me plz ?

Upstream Lock : Locked
Upstream Channel ID : 1
Upstream Frequency : 33600000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 57.0 dBmV
Upstream Mini-Slot Size : 2

Downstream Lock : Locked
Downstream Channel Id : 1
Downstream Frequency : 586750000 Hz
Downstream Modulation : QAM64
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : -10.1 dBmV
Downstream SNR : 35.4 dB

Re: Modem Levels
 

The power stated there is fine.

Micah56, the only thing of even slight concern is the upstream and downstream power levels, the downstream is borderline as the max tolerated is usually -10. The upstream again is as if the modem is shouting to be heard. However your signal to noise ratio is good :)
Possible call to faults about it, but i wouldn't bother unless it's causing problems tbh.

Re: Modem Levels
 

Thanks for your information Druchii :)

Re: Modem Levels
 

Downstream Value
Frequency 331000000 Hz Locked
Signal to Noise Ratio 37 dB
Power Level 7 dBmV
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



Upstream Value
Channel ID 1
Frequency 22192000 Hz Ranged
Power Level 51 dBmV


I think mines is ok apart from the 51 dBmV is getting near the 55 bad figure going by google info, anyone input more thanks :)

Re: Modem Levels
 

Your levels are fine :)

Re: Modem Levels
 

TY :)

Re: Modem Levels
 

I'd like to post mine as I am unsure of how they should be, now take into considerationg, we have a HDU box fitted from the main feed, this is then split 3 ways, 1 to SACM, 1 to V+, and the other a lead through the brickwork to outside, then down to the living room, through the wall into a Samsung STB...


Cable Modem Downstream
Downstream Lock : Locked
Downstream Channel Id : 0
Downstream Frequency : 586750000 Hz
Downstream Modulation : QAM64
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : -2.1 dBmV
Downstream SNR : 35.3 dB


Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 3
Upstream Frequency : 22000000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 39.0 dBmV
Upstream Mini-Slot Size : 2


Cable Modem Operation Configuration
Network Access : Allowed
Maximum Downstream Data Rate : 20480000
Maximum Upstream Data Rate : 768000
Maximum Upstream Channel Burst : 1600
Maximum Number of CPEs : 1
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Disabled


But in the events log:

Cable Modem Event Log
First Time Last Time Counts Level ID Text
Sat May 19 10:55:09 2007 Sat May 19 10:55:09 2007 2 Critical(3) 82000500 Started Unicast Maintenance Ranging - No Response received - ...
Sat May 19 10:52:06 2007 Sat May 19 10:52:06 2007 1 Warning(5) 68010300 DHCP RENEW WARNING - Field invalid in response
Time Not Established Time Not Established 5 Critical(3) 68000300 DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established 1 Critical(3) 68000200 DHCP FAILED - Request sent, No response
Time Not Established Time Not Established 1 Critical(3) 68000300 DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established 1 Critical(3) 68000200 DHCP FAILED - Request sent, No response
Time Not Established Time Not Established 7 Critical(3) 68000300 DHCP WARNING - Non-critical field invalid in response.
Sun May 13 00:18:51 2007 Sun May 13 00:18:51 2007 1 Critical(3) 82000400 Received Response to Broadcast Maintenance Request, But no Un...
Sat May 12 23:53:32 2007 Sat May 12 23:53:32 2007 1 Critical(3) 82000500 Started Unicast Maintenance Ranging - No Response received - ...
Time Not Established Time Not Established 2 Critical(3) 68000300 DHCP WARNING - Non-critical field invalid in response.
Sat May 12 21:05:29 2007 Sat May 12 21:05:29 2007 1 Critical(3) 82000500 Started Unicast Maintenance Ranging - No Response received - ...
Time Not Established Time Not Established 1 Critical(3) 68000300 DHCP WARNING - Non-critical field invalid in response.
Sat May 12 18:15:31 2007 Sat May 12 18:15:31 2007 1 Critical(3) 82000400 Received Response to Broadcast Maintenance Request, But no Un...
Time Not Established Time Not Established 7 Critical(3) 68000300 DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established 1 Critical(3) 82000200 No Ranging Response received - T3 time-out
Time Not Established Time Not Established 1 Critical(3) 82000700 Unicast Ranging Received Abort Response - Re- initializing MAC
Time Not Established Time Not Established 2 Critical(3) 82000200 No Ranging Response received - T3 time-out
Time Not Established Time Not Established 1 Critical(3) 82000700 Unicast Ranging Received Abort Response - Re- initializing MAC
Time Not Established Time Not Established 2 Critical(3) 82000200 No Ranging Response received - T3 time-out
Time Not Established Time Not Established 55 Critical(3) 84000200 SYNC Timing Synchronization failure - Failed to acquire FEC f...
Time Not Established Time Not Established 2470 Critical(3) 84000100 SYNC Timing Synchronization failure - Failed to acquire QAM/Q...



Thanks :)

Re: Modem Levels
 

Your levels look fine :tu:As for the log it looks alright unless the modem is loosing connection :)

Re: Modem Levels
 

Thank You Ned!

Just been on the phone to India about my slow speeds (max 4mb connection on upto 20mb) & he said I got a falty cable between the cab & my house, but thats a different matter hehe :)

Re: Modem Levels
 

I take it they have booked a service call then :tu:

Re: Modem Levels
 

Ned can you have a look at these numbers?
My sister seems to be getting about 6Mb??

Re: Modem Levels
 

I'm not Ned i know, but those look perfectly fine to me.

The 6Mb sounds as if she's using an NTL:100 or 120 though, or a generally old modem, which may be limiting her. Or a router by any chance?

Re: Modem Levels
 

Brand new modem as fitted about 2 weeks ago, no router
As an aside, I have a Netgear Rp614V3 router spare that I am thinking of fitting to the connection, is it rated for 20Mb? Can't find the specs at the moment and it might be quicker to ask here lol

Re: Modem Levels
 

According to the tech docs, it only has a 10Base-T WAN port, so I'd imagine you'd only get about 7-8meg out of it.

Good info here

http://kbserver.netgear.com/products/rp614v3.asp

Re: Modem Levels
 

Yes thank god!

The engineer called his manager while he was in the room to request a repull, which was granted, and it now booked for Saturday afternoon some time, and about time too, really fed up with 4mb speeds!

Oh, and something else very good too, he even provided me with a set of new leads saying that being as the cable is getting re-done, it might be goodfor new wiring all round, top idea that! :)

Thing Id like to know, being as they are doing a re-pull, would they be able to plug me into a different UBR while they are at it? Thought that if I could be moved to a less-used UBR then I could also rule that out of the troubleshooting senario for future issues...

Re: Modem Levels
 

No, the UBR your on is the UBR you are on period, its like the water pumping station for your area is the one you get water to your taps from, it dont suddenly change to another towns station unless it was repiped, they can however change the upstream channel you are on if its saturated which it should not be as it auto balance the load (well is meant to) but users have a habit of chaging it at their end and causing issues for others.