New Contributor III
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28 Messages
Slower speed after upgrading from sb6141 to sb6183
I upgraded my modem from the sb6141 to the sb6183. I used to get >90mbps consistently on my speed tests, now with the new modem I'm getting in the 70-80mbps range. Also, in the Pensacola area, how many channels am I supposed to be bonding to downstream? It's a 16x4 modem, but I'm only showing to 12 channels. A while ago, I upgraded from the very basic cable package, is it possible that the bandpass filter at the pole was never changed, and it's blocking the last 4 downstream channels, or does Pensacola only use 12? Is there anything that can be done to increase my speed back up to the >90mbps level? Here is my modem signal levels:
| 1 | Locked | QAM256 | 73 | 801000000 Hz | -9.5 dBmV | 38.5 dB | 0 | 0 |
| 2 | Locked | QAM256 | 74 | 807000000 Hz | -10.5 dBmV | 37.9 dB | 0 | 0 |
| 3 | Locked | QAM256 | 75 | 813000000 Hz | -10.3 dBmV | 37.9 dB | 0 | 0 |
| 4 | Locked | QAM256 | 76 | 819000000 Hz | -10.4 dBmV | 37.6 dB | 0 | 0 |
| 5 | Locked | QAM256 | 77 | 825000000 Hz | -10.0 dBmV | 37.9 dB | 0 | 0 |
| 6 | Locked | QAM256 | 78 | 831000000 Hz | -10.5 dBmV | 37.7 dB | 0 | 0 |
| 7 | Locked | QAM256 | 79 | 837000000 Hz | -11.1 dBmV | 37.3 dB | 0 | 0 |
| 8 | Locked | QAM256 | 80 | 843000000 Hz | -11.6 dBmV | 36.1 dB | 0 | 0 |
| 9 | Locked | QAM256 | 81 | 849000000 Hz | -11.9 dBmV | 36.7 dB | 0 | 0 |
| 10 | Locked | QAM256 | 82 | 855000000 Hz | -11.7 dBmV | 36.7 dB | 0 | 0 |
| 11 | Locked | QAM256 | 83 | 861000000 Hz | -11.4 dBmV | 36.7 dB | 0 | 0 |
| 12 | Locked | QAM256 | 84 | 867000000 Hz | -11.6 dBmV | 36.7 dB | 0 | 0 |
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ChrisL
Former Moderator
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7.1K Messages
Everything is correct with the firmware to the modem. The only issue I'm seeing is the reported signal levels are slightly off. The modem will bond to whatever number of channels is available in a given area which I believe to be 12 right now where you are. Overall I think based on the totality of what I'm seeing this is most likely a hardware issue. We slightly overprovision the speeds to account for modest overhead which means that 100Mbps gear is slightly underpowered for 100Mbps service.
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CraigP
New Contributor III
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28 Messages
Chris,
Thank you so much! I went ahead and upgraded the rest of my connection. In case anyone else is reading this thread, it's now an Arris SB6183 modem, CAT-6 cable to a Linksys WRT1200AC router, with a Linksys AC1200 usb adaptor on my laptop. That took care of my problem.
I'm not worried the ping to this location, this the best speedtest I've ever achieved on the download side. Thanks again!
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ChrisL
Former Moderator
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7.1K Messages
I'm actually seeing another area of concern when I look from here. Is the device you have connected to the modem gigabit Ethernet capable? I had a similar problem when I moved to the 6183 where the Ethernet cable had to be CAT6 in order to establish a gigabit phy link. From the testing you've posted I think the Ethernet link speed may be what's holding you back.
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CraigP
New Contributor III
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28 Messages
I'm connected from my laptop to my router at 300mbps using a Linksys N600 wireless adaptor. I am using the Linksys E2500 (N600) router with the latest firmware (3.0.01) to the modem. So no, the E2500 does not have a gigabit connector. I am using a CAT-5E cable between the modem and the router. This is the same setup I used with the old sb6141 modem. I am using the new CAT-5E cable that came with the new modem. When I bypass the router and direct connect to modem, my speeds are still below what I was getting with the sb6141. Again, my laptop ethernet port is not gigabit either. I am currently on the Premier 100mpbs plan, and am planning on going to the Ultimate, so my first step was to buy sb6183, then start upgrading the rest of the system to match. But my concern now is that the sb6183 isn't even as fast as the sb6141 to begin with at the 100mbps level. Is there a firmware update push from Cox for the new modem, or anything on your end that needs to be done? Or do you think it's all hardware related on my end? And just for curiosity sake, should be bonding at 12 channels, or 16 for my area?
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ChrisL
Former Moderator
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7.1K Messages
It appears you're in a much better place now as far as your home network is concerned. Let us know if we can help with anything else.
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