What are good signal levels

Need Help?

That's what we're here for! The goal of the Rogers Community is to help you find answers on everything Rogers. Can't find what you're looking for? Just ask!
cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
I've Been Around
Posts: 1

Re: What are good signal levels

Good evening, 

 

I'm looking to disable the SIP ALG setting on my router. Can you provide me with instructions? Thanks. 

Resident Expert
Resident Expert
Posts: 1,058

Re: What are good signal levels

Are you using the Rogers Modem/Gateway? if so which model are you running, the White CODA or the Black Rocket AC? 

 

I believe with the CODA the user can turn SIP ALG off/on, on the older Rocket Modem you need to call into tech support and they can do it over the phone. 

 

 



I'm a Reliable Contributor
Posts: 332

Re: What are good signal levels

I had a cable cut in my area and after 2 days it was up and running.  I had a look at my signal levels and they look really weird with QAM 64 channels.

 

Anyone seen this before?

 

Downstream Overview

Port ID

Frequency (MHz)

Modulation

Signal strength (dBmV)

Channel ID

Signal noise ratio (dB)

1

669000000

256QAM

-9.300

19

36.387

2

849000000

256QAM

-10.800

2

36.387

3

519000000

64QAM

-10.700

3

4.191

4

579000000

64QAM

-10.900

4

4.191

5

579000000

64QAM

-8.700

5

4.191

6

585000000

64QAM

-9.300

6

4.191

7

591000000

64QAM

-9.000

7

4.191

8

597000000

64QAM

-9.000

8

4.191

9

603000000

64QAM

-9.700

9

4.191

10

609000000

64QAM

-10.300

10

4.191

11

615000000

256QAM

-10.800

11

36.387

12

621000000

256QAM

-10.800

12

36.610

13

633000000

256QAM

-11.400

13

35.780

14

639000000

256QAM

-12.300

14

34.926

15

645000000

256QAM

-13.000

15

34.926

16

651000000

256QAM

-13.400

16

34.484

17

657000000

256QAM

-12.800

17

35.084

18

663000000

256QAM

-10.600

18

35.780

19

303000000

256QAM

-5.700

1

36.387

20

675000000

256QAM

-8.600

20

36.610

21

681000000

256QAM

-8.600

21

36.610

22

687000000

256QAM

-9.700

22

36.387

23

693000000

256QAM

-11.900

23

35.595

24

699000000

256QAM

-13.000

24

34.484

25

705000000

256QAM

-14.100

25

33.834

26

711000000

256QAM

-15.800

26

33.063

27

717000000

256QAM

-15.700

27

33.063

28

723000000

256QAM

-14.700

28

33.487

29

825000000

256QAM

-14.500

29

33.957

30

831000000

256QAM

-13.300

30

34.926

31

837000000

256QAM

-12.300

31

35.780

32

843000000

256QAM

-11.500

32

35.780

OFDM Downstream Overview

Receiver

FFT type

Subcarr 0 Frequency(MHz)

PLC locked

NCP locked

MDC1 locked

PLC power(dBmv)

0

NA

NA

NO

NO

NO

NA

1

NA

NA

NO

NO

NO

NA

                 

 

Upstream Overview

Port ID

Frequency (MHz)

Modulation

Signal strength (dBmV)

Channel ID

Bandwidth

1

30596000

ATDMA - 64QAM

35.500

1

6400000

2

38596000

ATDMA - 64QAM

39.000

3

3200000

3

23700000

ATDMA - 64QAM

33.750

2

6400000

OFDM/OFDMA Overview

 

Channel Index

State

lin Digital Att

Digital Att

BW (sc's*fft)

Report Power

Report Power1_6

FFT Size

0

DISABLED

0.5000

0.0000

0.0000

-inf

-1.0000

4K

1

DISABLED

0.5000

0.0000

0.0000

-inf

-1.0000

4K

I'm a Reliable Contributor
Posts: 332

Re: What are good signal levels

As an update, I power cycled the modem, and installed the amp the Rogers tech gave me and my levels are as follows:

 

Version:1.0 StartHTML:000000194 EndHTML:000010412 StartFragment:000002678 EndFragment:000010356 StartSelection:000002798 EndSelection:000010318 SourceURL:http://192.168.100.1/index.htmlCODA-4582 Router - Hitron Technologies

Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 669000000 256QAM 2.300 19 37.356
2 849000000 256QAM 1.000 2 37.636
3 855000000 256QAM 1.300 3 37.356
4 861000000 256QAM 1.100 4 36.610
5 579000000 256QAM 2.900 5 36.610
6 585000000 256QAM 2.400 6 37.356
7 591000000 256QAM 2.700 7 37.636
8 597000000 256QAM 2.800 8 37.356
9 603000000 256QAM 1.900 9 37.636
10 609000000 256QAM 1.200 10 37.356
11 615000000 256QAM 0.900 11 37.356
12 621000000 256QAM 0.800 12 37.356
13 633000000 256QAM 0.400 13 37.356
14 639000000 256QAM -0.500 14 36.610
15 645000000 256QAM -1.100 15 36.610
16 651000000 256QAM -1.400 16 36.610
17 657000000 256QAM -1.000 17 36.610
18 663000000 256QAM 1.000 18 37.356
19 303000000 256QAM 5.700 1 36.387
20 675000000 256QAM 3.000 20 37.636
21 681000000 256QAM 3.100 21 37.636
22 687000000 256QAM 1.900 22 37.356
23 693000000 256QAM -0.200 23 37.356
24 699000000 256QAM -1.300 24 35.780
25 705000000 256QAM -2.400 25 35.595
26 711000000 256QAM -4.000 26 35.595
27 717000000 256QAM -4.100 27 35.595
28 723000000 256QAM -3.200 28 35.595
29 825000000 256QAM -2.500 29 36.387
30 831000000 256QAM -1.500 30 36.610
31 837000000 256QAM -0.500 31 37.636
32 843000000 256QAM 0.400 32 37.356
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 NA NA NO NO NO NA
1 4K 275600000 YES YES YES 5.900002
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 37.500 1 6400000
2 38595785 ATDMA - 64QAM 41.500 3 3200000
3 23700000 ATDMA - 64QAM 37.500 2 6400000
OFDM/OFDMA Overview
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
1 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
I'm a Reliable Contributor
Posts: 332

Re: What are good signal levels

Now my levels took a nosedive again.  Is there someone that can look into this for me please?

 

Thanks

 

DOCSIS WAN

This menu displays both upstream and downstream signal parameters

DOCSIS Overview
Network Access Permitted
   
Subnet Mask 255.255.252.0
   
DHCP Lease Time D: 06 H: 07 M: 56 S: 54
Downstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 657000000 256QAM -3.300 17 35.780
2 849000000 256QAM -5.700 2 35.780
3 855000000 256QAM -5.600 3 35.780
6 585000000 256QAM -0.500 6 36.387
8 597000000 256QAM -0.100 8 37.356
9 603000000 256QAM -0.700 9 37.356
10 609000000 256QAM -1.600 10 36.610
11 615000000 256QAM -2.500 11 36.387
12 621000000 256QAM -3.000 12 35.780
13 633000000 256QAM -4.000 13 35.780
14 639000000 256QAM -4.600 14 35.084
15 645000000 256QAM -4.600 15 34.926
16 651000000 256QAM -3.900 16 35.780
17 303000000 256QAM 1.200 1 35.780
18 663000000 256QAM -2.400 18 36.610
19 669000000 256QAM -1.800 19 37.356
20 675000000 256QAM -1.200 20 37.356
21 681000000 256QAM -1.500 21 36.610
22 687000000 256QAM -2.300 22 36.610
23 693000000 256QAM -3.600 23 36.387
24 699000000 256QAM -4.700 24 35.595
25 705000000 256QAM -5.700 25 35.595
26 711000000 256QAM -7.200 26 34.484
27 717000000 256QAM -7.500 27 33.834
28 723000000 256QAM -7.600 28 33.957
29 825000000 256QAM -6.900 29 34.926
30 831000000 256QAM -6.100 30 35.780
31 837000000 256QAM -6.200 31 35.595
32 843000000 256QAM -6.300 32 35.595
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 NA NA NO NO NO NA
1 4K 275600000 YES YES YES 1.400002
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 35.750 1 6400000
2 38596000 ATDMA - 64QAM 38.750 3 3200000
3 23700000 ATDMA - 64QAM 35.250 2 6400000
OFDM/OFDMA Overview
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
1 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
Resident Expert
Resident Expert
Posts: 1,058

Re: What are good signal levels

@mahomed

I would advise you to remove the Amplifier and call Rogers then have them check your line stats. I would ask them to compare to a neighbour so they can see if this is an area wide issue, or just your connection. Also don't mess around with the connection, if Rogers put an AMP in then leave it alone. 

 

It's best to have a tech come out and equalize the line. then you don't touch it. Rogers knows how to set the coax up, when a customer plays with it you can be putting a lot of noise and ingress into the cable plant which ruins the experience for everyone.

 

The spec is -10 to +10, 0 is optimal but not required, my line stats are actually around -7, but I've never had an issue getting full gigabit speed (950mb/s), don't think you need the line right at 0 to get full speed, that's not how DOCSIS works. SNR is much more important, and buy playing with the line you can be causing major SNR issues for everyone on your TAP/NODE/CMTS.

 



I'm a Reliable Contributor
Posts: 332

Re: What are good signal levels

@gp-se

 

Thanks for your reply.

 

It turned out that Rogers was fixing an area issue at the distribution box for most of the day and now my levels look good.  I have the amp as the way the wiring is without it, I get a 10 dB loss on the line and it puts things pretty weak to the point that the OFDM Downstream won't lock.

 

 

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDSignal noise ratio (dB)
1609000000256QAM5.8001037.636
2849000000256QAM0.900237.636
3855000000256QAM1.000336.610
6585000000256QAM6.400637.636
8597000000256QAM7.200838.605
9603000000256QAM6.700938.605
10303000000256QAM8.000136.610
11615000000256QAM5.0001137.356
12621000000256QAM4.7001237.636
13633000000256QAM3.9001337.636
14639000000256QAM3.5001437.356
15645000000256QAM3.6001537.636
16651000000256QAM4.3001637.636
17657000000256QAM5.1001737.356
18663000000256QAM6.0001838.983
19669000000256QAM6.8001938.605
20675000000256QAM7.5002038.605
21681000000256QAM7.5002138.605
22687000000256QAM6.8002238.605
23693000000256QAM5.7002337.636
24699000000256QAM4.6002437.636
25705000000256QAM3.5002537.636
26711000000256QAM2.1002637.356
27717000000256QAM1.8002736.387
28723000000256QAM1.6002837.356
29825000000256QAM0.0002936.610
30831000000256QAM0.7003037.356
31837000000256QAM0.5003137.356
32843000000256QAM0.4003237.356
OFDM Downstream Overview
ReceiverFFT typeSubcarr 0 Frequency(MHz)PLC lockedNCP lockedMDC1 lockedPLC power(dBmv)
0NANANONONONA
14K275600000YESYESYES8.199997
Upstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Channel IDBandwidth
130596000ATDMA - 64QAM40.50016400000
238596000ATDMA - 64QAM43.50033200000
323700000ATDMA - 64QAM40.00026400000
OFDM/OFDMA Overview
Channel IndexStatelin Digital AttDigital AttBW (sc's*fft)Report PowerReport Power1_6FFT Size
0DISABLED0.50000.00000.0000-inf-1.00004K
1DISABLED0.50000.00000.0000-inf-1.00004K
I'm a Reliable Contributor
Posts: 332

Re: What are good signal levels

Some guidelines for 

 

I came across some info about docsis 3/3.1 signal levels and wanted to know if this info is correct:

 

 

Docsis 3.0 and 3.1 Signal Levels

Downstream (Rx) Receive Power Level:
This is the amount of signal received by the modem from the transmitter in the cable company head-end.
For all modems DOCSIS 3.0 / 3.1:
 
-7 dBmV to +7 dBmV "Recommended"
-8 dBmV to -10 dBmV / +8 dBmV to +10 dBmV - "Acceptable"
-11 dBmV to -15 dBmV / +11 dBmV to +15 dBmV - "Maximum"
Lower than -15 dBmV & Higher than +15 dBmV - "Out Of Spec."
 
SNR (signal to noise ratio) levels:
This is how clear the signal is at either the modem receiver (downstream SNR) or the receiver in the cable company head-end (upstream SNR).
DOCSIS specifications list minimum CNR (carrier to noise ratio) levels not SNR levels. The SNR levels listed here are based on commonly recommended MER levels for digital cable signals. Not all QAM demodulator chipsets accurately calculate SNR levels that approximate actual MER levels, so these levels may vary depending on which chipset and/or firmware is used in the equipment.
 
*There is no upper SNR limit.
 
For all modems DOCSIS 3.0 / 3.1:
 
256 QAM: 30 dB minimum. 33 dB or higher recommended.
64 QAM: 24 dB minimum. 27 dB or higher recommended.
16 QAM: 18 dB minimum. 21 dB or higher recommended.
QPSK: 12 dB minimum. 15 dB or higher recommended.
 
Downstream SNR levels are read at the modem on the downstream data channel and can be viewed using the modem diagnostic screens.
 
Upstream SNR levels are read at the CMTS on the upstream data channel, not the modem or the modem diagnostic screens. The end-user cannot get the upstream SNR directly. Only the provider can read the upstream SNR level, directly from the CMTS. Also, the upstream SNR level provided by most CMTSs is not specific to any single modem, but is an averaged, aggregate level from all modems on that upstream channel on the upstream port.
 
Upstream (Tx) Transmit Power (a.k.a. Return Signal) level:
This is the amount of signal transmitted by the modem to reach the receiver in the cable company head-end.
 
*Recommended Upstream signal levels are +35 dBmV to +47 dBmV (DOCSIS 3.1)
*Recommended Upstream signal levels are +35 dBmV to +49 dBmV (DOCSIS 3.0)
 
50 dBmV maximum for SC-QAM (DOCSIS 3.1)
52 dBmV maximum for A-TDMA & TDMA (DOCSIS 3.0)
53 dBmV maximum for S-CDMA DOCSIS 2.0 (All Modulations)
54 dBmV maximum for 32 QAM and 64 QAM. (A-TDMA DOCSIS 2.0)
55 dBmV maximum for 8 QAM and 16 QAM. (DOCSIS 1.0, 1.1)
58 dBmV maximum for QPSK. (DOCSIS 1.0, 1.1)
 
A cable modem running a higher upstream modulation rate may downgrade itself to a lower modulation rate (i.e. 64 QAM to 16 QAM or 16 QAM to QPSK) if the upstream transmit level is higher than the maximum signal level allowed for the higher modulation rate and the CMTS is configured to allow such a change. This downgrade can cause slow speed, packet loss, and connection loss issues depending on the condition of the upstream channel.
 
A house or drop amplifier will NOT fix an upstream signal problem because most house amplifiers don't amplify the upstream signals; they only pass the upstream signal through with some loss.
 
Important notes concerning signal levels:
1. Signal levels not within the specifications listed above can cause slow speeds, connection problems, and connection loss due to packet errors, packet loss, and/or constant packet re-transmission.
 
2. It's recommended to have the modem's signal levels at least 3dB away from the maximum/minimum levels listed above due to normal temperature related signal variation. If the modem's signal levels are at the maximum or minimum limits, they may be out of spec. if the temperature changes significantly. Signal levels that vary more then 3 dB in a 24-hour period usually indicate a problem that should be looked into.
 
3. Excess splits, bad connectors, and/or poor quality cabling will certainly effect cable signal levels and will cause problems.

Moderator
Moderator
Posts: 425

Re: What are good signal levels

Hello @mahomed,

 

Thanks so much for posting all of this useful information.

 

You're spot on with the signal ranges that you've posted. I have double checked them with the tools at our disposal when investigating potential RF issues.

 

The important notes you've posted are also very informative. We appreciate all of your valuable contributions to the Rogers Community Forums. Robot Happy

 

Regards,

 

RogersTony

I Plan to Stick Around
Posts: 231

Re: What are good signal levels

 

general sluggish internet

 

internet just dosnt seem to be up to par latly just wondering if maybe time for another tech visit :-)

 

Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Signal noise ratio (dB)
1 609000000 256QAM -8.300 10 32.321
2 849000000 256QAM -14.400 2 30.154
3 855000000 256QAM -13.500 3 30.824
4 861000000 256QAM -13.000 4 31.136
5 579000000 256QAM -6.500 5 33.063
6 585000000 256QAM -5.500 6 33.487
7 591000000 256QAM -5.500 7 33.487
8 597000000 256QAM -6.600 8 33.377
9 603000000 256QAM -7.100 9 32.963
10 303000000 256QAM -1.600 1 33.487
11 615000000 256QAM -8.800 11 31.915
12 621000000 256QAM -9.200 12 31.404
13 633000000 256QAM -9.500 13 31.335
14 639000000 256QAM -9.200 14 31.689
15 645000000 256QAM -8.900 15 31.994
16 651000000 256QAM -8.400 16 32.237
17 657000000 256QAM -7.700 17 32.963
18 663000000 256QAM -7.500 18 33.487
19 669000000 256QAM -7.300 19 33.487
20 675000000 256QAM -6.800 20 33.957
21 681000000 256QAM -7.100 21 33.834
22 687000000 256QAM -8.200 22 33.063
23 693000000 256QAM -8.800 23 32.963
24 699000000 256QAM -9.700 24 32.585
25 705000000 256QAM -10.100 25 32.321
26 711000000 256QAM -11.200 26 31.335
27 717000000 256QAM -11.700 27 31.136
28 723000000 256QAM -11.900 28 30.885
29 825000000 256QAM -14.500 29 29.620
30 831000000 256QAM -15.000 30 29.269
31 837000000 256QAM -15.200 31 29.441
32 843000000 256QAM -14.600 32 29.807
OFDM Downstream Overview
Receiver FFT type Subcarr 0 Frequency(MHz) PLC locked NCP locked MDC1 locked PLC power(dBmv)
0 NA NA NO NO NO NA
1 4K 290600000 YES YES YES -2.700001
Upstream Overview
Port ID Frequency (MHz) Modulation Signal strength (dBmV) Channel ID Bandwidth
1 30596000 ATDMA - 64QAM 37.250 1 6400000
2 38596000 ATDMA - 64QAM 41.750 3 3200000
3 23700000 ATDMA - 64QAM 35.000 2 6400000
OFDM/OFDMA Overview
Channel Index State lin Digital Att Digital Att BW (sc's*fft) Report Power Report Power1_6 FFT Size
0 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
1 DISABLED 0.5000 0.0000 0.0000 -inf -1.0000 4K
What's New
UFC 231: Holloway vs. Ortega Live
LIVE: Saturday December 8, 2018 10PM ET
Countdown: 9:30 PM ET
Channels: 348 (HD) | 350 (SD) | Ignite TV 499
Price: $64.99 (HD) | $59.99 (SD) | Ignite TV $64.99
Ignite TV customers can order now!
DTV Customers can order as of Dec 6 at 4pm ET.
UFC 231: Countdown Promo

UFC returns to Toronto on December 8th with a championship double-header as undisputed featherweight champion Max Holloway defends his title against unbeaten Brian Ortega. Also, a new UFC women's flyweight champion will be crowned when Valentina Shevchenko takes on former strawweight queen Joanna Jedrzejczyk for the vacant title. Saturday, December 8, live on Sportsnet Pay-Per-View from Scotiabank Arena in Toronto, Canada.

Topic Stats