Hi,
On 4/29 I upgraded from a 250MB plan to a gigabit plan. On 5/1 I received my XB6 (CGM4140COM) modem/router and installed.
Previous Setup:
Current Setup:
In summary, here's what changed:
After installation I ran a speed test:
Prior to installation speed test with previous equipment:
ISSUES:
Troubleshooting:
At a time when most people are working from home, having a secure and reliable internet connection is very important. Is anyone experiencing similar issues or have a resolution?
Downstream
Downstream | Channel Bonding Value | ||||||||||||||||||||||||||||||||
Index | 44 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 45 | 46 | 47 | 48 | |
Lock Status | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked | Locked |
Frequency | 669 MHz | 507 MHz | 513 MHz | 519 MHz | 525 MHz | 531 MHz | 537 MHz | 543 MHz | 549 MHz | 555 MHz | 561 MHz | 567 MHz | 573 MHz | 579 MHz | 585 MHz | 591 MHz | 597 MHz | 603 MHz | 609 MHz | 615 MHz | 621 MHz | 627 MHz | 633 MHz | 639 MHz | 645 MHz | 651 MHz | 657 MHz | 663 MHz | 675 MHz | 681 MHz | 687 MHz | 722 MHz | 629600000 |
SNR | 38.9 dB | 41.6 dB | 41.2 dB | 41.5 dB | 41.0 dB | 41.2 dB | 40.7 dB | 40.8 dB | 40.5 dB | 40.5 dB | 40.7 dB | 40.2 dB | 40.2 dB | 40.1 dB | 40.6 dB | 40.3 dB | 40.2 dB | 39.8 dB | 40.1 dB | 39.8 dB | 40.0 dB | 39.1 dB | 39.5 dB | 39.3 dB | 39.7 dB | 38.5 dB | 38.3 dB | 38.1 dB | 37.7 dB | 37.6 dB | 37.4 dB | 37.5 dB | NA |
Power Level | -4.8 dBmV | -1.3 dBmV | -2.2 dBmV | -1.6 dBmV | -2.6 dBmV | -2.0 dBmV | -2.7 dBmV | -2.7 dBmV | -3.2 dBmV | -3.0 dBmV | -2.8 dBmV | -3.5 dBmV | -3.6 dBmV | -3.6 dBmV | -2.9 dBmV | -3.3 dBmV | -3.5 dBmV | -4.1 dBmV | -3.5 dBmV | -3.6 dBmV | -3.6 dBmV | -5.0 dBmV | -4.5 dBmV | -4.6 dBmV | -3.9 dBmV | -5.5 dBmV | -5.8 dBmV | -5.9 dBmV | -5.7 dBmV | -6.3 dBmV | -6.5 dBmV | -4.2 dBmV | NA |
Modulation | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | 256 QAM | OFDM | OFDM |
UPSTREAM
Upstream | Channel Bonding Value | |||
Index | 1 | 2 | 3 | 4 |
Lock Status | Locked | Locked | Locked | Locked |
Frequency | 36 MHz | 29 MHz | 23 MHz | 16 MHz |
Symbol Rate | 5120 | 5120 | 5120 | 5120 |
Power Level | 43.5 dBmV | 43.3 dBmV | 42.5 dBmV | 42.0 dBmV |
Modulation | QAM | QAM | QAM | QAM |
Channel Type | ATDMA | ATDMA | ATDMA | ATDMA |
Sir, unfortunatelly you are not alone. Same problem for months. Four times they replace everything, check everything etc and nothing help. One hour ago I was on chat line with Comcast agent bcs my wifi speed drop from 240 Mbps to 12 Mbps. No reason and also no explanation and worst of all, no solution. I was hoping to find some solution here, on the forum.
This might sound completely nuts but.... have you tried / can you try a Cat 5e cable instead of Cat 6?
I recently had a bizzarre issue where the brand-new XB6 Technicolor CGM4140COM would not link to my gateway at anything higher than 100Mbps on either ethernet port. It was a brand-new Cat 6 cable only about 2 feet long. On a whim I changed that Cat 6 out for a Cat 5e and immediately the ethernet link went to 1000Mbps. (Unfortunately neither my router nor this model XB6 report anything like duplex or packet errors so I don't have any more information than the link speed.)
When the modem ethernet was linking at 100M I think my speed tests maxed out around 90Mbps.
I am having the same issue but am running cat5e cables. I had 900+mbps yesterday (my first day as a customer), but have since lost that capability and am averaging around 90mbps. Oddly enough, my wifi speeds are over 500mpbs. So i'm at a loss here.
As a general rule, when you max out around 90Mbps using Ethernet, you are almost always seeing the result of a 100M Ethernet link somewhere in the mix. To get anything more than about 90Mbps over Ethernet everything has to be linking at 1000M speed.
https://en.wikipedia.org/wiki/Gigabit_Ethernet
compared to
https://en.wikipedia.org/wiki/Fast_Ethernet
(Needless to say, if you get any number higher than 90 download or upload then you know your Ethernet is indeed linking at 1G - or you're on WiFi.)