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MB8600 - slow gigabit (downstream only)
Hi, I have Xfinity Gigabit as part of my service plan.
My current hardware setup is:
Modem: Motorola MB8600
Router: Linksys EA6350
The issue: the downstream light on the MB8600 is blinking and I am getting a consistent 30Mbps down no matter what device I try, no matter whether I connect through Ethernet, 2.4Ghz, or 5Ghz, no matter if I connect directly to the modem and bypass the router. The last acceptable speeds were probably in the 400-500Mbps range just a couple of days ago. (I understand my router probably can't handle gigabit speeds but it definitely can handle more than 30 down.)
My upstream results are as expected, 40Mbps.
Things I have already tried:
- https://forums.xfinity.com/t5/Your-Home-Network/Gigabit-speed-troubleshooting-video/td-p/3310454
- I have taken the modem outside of the house and connected it directly to the box outside, bypassing the coax into the house and I get the same speeds. There are no splitters between the modem and the line at this point. (Actually, there are no splitters between the line and where the modem sits traditionally in my house.)
Downstream Bonded Channels
| Channel | Lock Status | Modulation | Channel ID | Freq. (MHz) | Pwr (dBmV) | SNR (dB) | Corrected | Uncorrected |
| 1 | Locked | QAM256 | 41 | 651.0 | -14.1 | 35.1 | 0 | 0 |
| 2 | Locked | QAM256 | 13 | 483.0 | -5.9 | 41.5 | 0 | 0 |
| 3 | Locked | QAM256 | 14 | 489.0 | -6.7 | 40.9 | 0 | 0 |
| 4 | Locked | QAM256 | 15 | 495.0 | -7.0 | 40.5 | 0 | 0 |
| 5 | Locked | QAM256 | 16 | 501.0 | -7.2 | 40.9 | 0 | 0 |
| 6 | Locked | QAM256 | 17 | 507.0 | -7.9 | 39.8 | 0 | 0 |
| 7 | Locked | QAM256 | 18 | 513.0 | -8.0 | 39.8 | 0 | 0 |
| 8 | Locked | QAM256 | 19 | 519.0 | -7.7 | 40.3 | 0 | 0 |
| 9 | Locked | QAM256 | 20 | 525.0 | -7.2 | 40.4 | 0 | 0 |
| 10 | Locked | QAM256 | 21 | 531.0 | -6.3 | 40.7 | 0 | 0 |
| 11 | Locked | QAM256 | 22 | 537.0 | -5.6 | 41.1 | 0 | 0 |
| 12 | Locked | QAM256 | 23 | 543.0 | -5.6 | 41.1 | 0 | 0 |
| 13 | Locked | QAM256 | 24 | 549.0 | -5.6 | 41.0 | 0 | 0 |
| 14 | Locked | QAM256 | 25 | 555.0 | -6.2 | 40.8 | 0 | 0 |
| 15 | Locked | QAM256 | 26 | 561.0 | -7.9 | 39.9 | 0 | 0 |
| 16 | Locked | QAM256 | 27 | 567.0 | -9.1 | 38.9 | 0 | 0 |
| 17 | Locked | QAM256 | 28 | 573.0 | -9.7 | 38.6 | 0 | 0 |
| 18 | Locked | QAM256 | 29 | 579.0 | -11.6 | 37.4 | 0 | 0 |
| 19 | Locked | QAM256 | 30 | 585.0 | -12.2 | 36.6 | 0 | 0 |
| 20 | Locked | QAM256 | 31 | 591.0 | -10.8 | 37.7 | 0 | 0 |
| 21 | Locked | QAM256 | 32 | 597.0 | -10.9 | 37.6 | 0 | 0 |
| 22 | Locked | QAM256 | 33 | 603.0 | -10.7 | 37.4 | 0 | 0 |
| 23 | Locked | QAM256 | 34 | 609.0 | -9.6 | 38.5 | 0 | 0 |
| 24 | Locked | QAM256 | 35 | 615.0 | -9.4 | 38.7 | 0 | 0 |
| 25 | Locked | QAM256 | 36 | 621.0 | -10.2 | 37.9 | 0 | 0 |
| 26 | Locked | QAM256 | 37 | 627.0 | -10.3 | 37.9 | 0 | 0 |
| 27 | Locked | QAM256 | 38 | 633.0 | -11.5 | 37.2 | 0 | 0 |
| 28 | Locked | QAM256 | 39 | 639.0 | -13.1 | 35.7 | 0 | 0 |
| 29 | Locked | QAM256 | 40 | 645.0 | -13.4 | 35.5 | 0 | 0 |
| 30 | Locked | QAM256 | 42 | 657.0 | -15.0 | 34.2 | 0 | 0 |
| 31 | Locked | QAM256 | 43 | 663.0 | -15.8 | 33.2 | 0 | 0 |
| 32 | Locked | QAM256 | 44 | 669.0 | -17.0 | 32.4 | 0 | 0 |
| 33 | Locked | OFDM PLC | 159 | 690.0 | -29.5 | 0.0 | 0 | 66 |
Upstream Bonded Channels
| Channel | Lock Status | Channel Type | Channel ID | Symb. Rate (Ksym/sec) | Freq. (MHz) | Pwr (dBmV) |
| 1 | Locked | SC-QAM | 1 | 5120 | 35.6 | 44.3 |
| 2 | Locked | SC-QAM | 2 | 5120 | 29.2 | 44.3 |
| 3 | Locked | SC-QAM | 3 | 5120 | 22.8 | 43.8 |
| 4 | Locked | SC-QAM | 4 | 5120 | 16.4 | 42.8 |
| 5 | Locked | SC-QAM | 5 | 1280 | 39.6 | 44.8 |
I had a tech out late last month due to this same issue. Any assistance would be greatly appreciated. Thanks!
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Accepted Solution
dixonjw
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2 Messages
5 m ago
Update: tech came out and did an analysis, found water in the line from the pole to the outside box. He replaced the line and everything is fixed.
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