Xfinity plant
Xfinity globe
Community Forum

Slow gigabit speed

Regular Visitor

Slow gigabit speed

Paying for gigabit internet, as offered for my address. 

 

Using Arris surfboard SB8200 docsis 3.1 modem and netgear nighthawk x6 r8000 router, wired connection to laptop and only getting speeds around 270mb/s.

Was getting speeds around 950mb/s when first installed.

Talked to customer service and they sent a profession installation order (as an upgrade) and the technician came by expecting to upgrade my internet and saying that he wasn't sure my modem was supported and that I would have to lease a modem for them to guarantee gigabit speeds. 

 

He was on the phone with his supervisor and she was saying they would not test the network because I am using my retail modem.

 

Wondering where I should go with this.. The speeds were there but are no longer passing 350mb/s if I'm lucky.


Accepted Solutions
Regular Contributor

Re: Slow gigabit speed


roghamed wrote:

Appreciate your replies.  I told the tech I wasn't interested in leasing a modem.  Is it possible my router config could be something to check?  Also, when pluggin the ethernet directly into the modem I can't connect to the internet.. I have to use the ethernet ports on the router.

 


Each time you change what's connected to the CM you need to reboot it.  If it's the router then try swapping out the Ethernet cable, if it's still slow it might be a good idea to do a hard reset on the router.  If it's still an issue then swap out the router.


All Replies
Regular Contributor

Re: Slow gigabit speed

No!  don't lease a modem!!

 

Check your Ethernet cables, change ports on the router, test directly from the modem to isolate whether it's the router or not. If you're using a Switch it could be an issue there as well. It quite possibly could be the router depending on how old it is.

 

I went through this as well when upgrading to find out my existing router was a bottleneck at 250M when it had gig ports and AC rating for wifi.  I ended up with an MB8600 / Netgear R7800 (X4S) / Intel 9260 and now I'm able to get wired speeds over wifi.  All of the current D3.1 CM's are the same other than the # of ports on the back.  

Expert

Re: Slow gigabit speed


roghamed wrote:

 


Was getting speeds around 950mb/s when first installed.

 

The speeds were there but are no longer passing 350mb/s if I'm lucky.


Maybe your signal status has changed ? What do the modem's signal stats look like ? Try getting them here; http://192.168.100.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

Start with the modem's signal stats. Perhaps they already are, or they are close to being out of spec and intermittently they go completely of spec. Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.


Regular Visitor

Re: Slow gigabit speed

Appreciate your replies.  I told the tech I wasn't interested in leasing a modem.  Is it possible my router config could be something to check?  Also, when pluggin the ethernet directly into the modem I can't connect to the internet.. I have to use the ethernet ports on the router.

 

The signal stats are as follows:

 

 
Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
29 Locked QAM256 729000000 Hz 2.7 dBmV 40.0 dB 0 0
1 Locked QAM256 561000000 Hz 5.4 dBmV 42.6 dB 0 0
2 Locked QAM256 567000000 Hz 5.0 dBmV 42.2 dB 0 0
3 Locked QAM256 573000000 Hz 5.0 dBmV 42.4 dB 0 0
4 Locked QAM256 579000000 Hz 4.9 dBmV 42.4 dB 0 0
5 Locked QAM256 585000000 Hz 4.1 dBmV 42.0 dB 0 0
6 Locked QAM256 591000000 Hz 4.1 dBmV 42.1 dB 0 0
7 Locked QAM256 597000000 Hz 3.6 dBmV 41.5 dB 0 0
8 Locked QAM256 603000000 Hz 3.0 dBmV 41.1 dB 0 0
9 Locked QAM256 609000000 Hz 2.9 dBmV 41.1 dB 0 0
10 Locked QAM256 615000000 Hz 2.0 dBmV 40.4 dB 0 0
11 Locked QAM256 621000000 Hz 2.4 dBmV 40.7 dB 0 0
12 Locked QAM256 627000000 Hz 2.2 dBmV 40.8 dB 0 0
13 Locked QAM256 633000000 Hz 1.9 dBmV 40.4 dB 0 0
14 Locked QAM256 639000000 Hz 2.3 dBmV 40.6 dB 0 0
15 Locked QAM256 645000000 Hz 2.0 dBmV 40.4 dB 0 0
16 Locked QAM256 651000000 Hz 2.1 dBmV 40.5 dB 0 0
17 Locked QAM256 657000000 Hz 2.0 dBmV 40.3 dB 0 0
18 Locked QAM256 663000000 Hz 1.7 dBmV 39.9 dB 0 0
19 Locked QAM256 669000000 Hz 2.3 dBmV 40.5 dB 0 0
20 Locked QAM256 681000000 Hz 2.7 dBmV 40.6 dB 0 0
21 Locked QAM256 687000000 Hz 3.6 dBmV 41.1 dB 0 0
22 Locked QAM256 693000000 Hz 3.6 dBmV 41.1 dB 0 0
23 Locked QAM256 699000000 Hz 3.9 dBmV 41.1 dB 0 0
24 Locked QAM256 705000000 Hz 3.9 dBmV 41.1 dB 385 8
27 Locked QAM256 717000000 Hz 3.3 dBmV 40.5 dB 0 0
28 Locked QAM256 723000000 Hz 2.9 dBmV 40.2 dB 0 0
25 Locked Other 780000000 Hz 5.1 dBmV 38.8 dB 163247 0

 

 
Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 45 Locked SC-QAM 36500000 Hz 6400000 Hz 36.3 dBmV
2 46 Locked SC-QAM 30100000 Hz 6400000 Hz 36.5 dBmV
3 47 Locked SC-QAM 23700000 Hz 6400000 Hz 36.3 dBmV

 

 
Expert

Re: Slow gigabit speed

Looks good.

Regular Contributor

Re: Slow gigabit speed


roghamed wrote:

Appreciate your replies.  I told the tech I wasn't interested in leasing a modem.  Is it possible my router config could be something to check?  Also, when pluggin the ethernet directly into the modem I can't connect to the internet.. I have to use the ethernet ports on the router.

 


Each time you change what's connected to the CM you need to reboot it.  If it's the router then try swapping out the Ethernet cable, if it's still slow it might be a good idea to do a hard reset on the router.  If it's still an issue then swap out the router.

Regular Visitor

Re: Slow gigabit speed

Connected directly to the 2nd port on the modem, speeds are up to about 1000mb/s.. must be the router then.  Thank you all

Regular Visitor

Re: Slow gigabit speed

checking back in... my complete solution was to do a hard reset on my router and disable upnp.  speeds while connected to router are about 900mb/s now.