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sway0004
join:2005-04-29
Surprise, AZ

sway0004

Member

[Speed] 105mbps not receiving speed im paying for..

hey guys so i went and had blast for a year and a half. The service has since been upgraded to x1 triple play so i have the same emta modem smgnv3 or so.. I went online chat support and tried to get a stable and reliable speed of 80mbps or better paying for extreme got 110mbps as a record on install day. since then its been really sluggish. and holding blast speeds like such »stage.results.speedtest. ··· 8044.png,
»stage.results.speedtest. ··· 9344.png
sway0004

sway0004

Member

now i want to upgrade my modem will that fix it ? and what do i say when i walk in to the local shop and they say what can i do for you as i set the modem down.

train_wreck
slow this bird down
join:2013-10-04
Antioch, TN
Cisco ASA 5506
Cisco DPC3939

train_wreck to sway0004

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mind checking this out (if you haven't), and in particular posting your signals?

»Comcast High Speed Internet FAQ »How To Get Help!

as well, have you tried having the gateway put into bridge mode, to see if that clears things up? (don't have an eMTA, so don't know if they can be bridged; in general bridging is preferable, then use with your own router). All-in-one gateways tend to be unreliable for a lot of people; perhaps getting your own plain eMTA might be worth looking into

MDA
Auto Negotiating
Premium Member
join:2013-09-10
Minneapolis, MN
Netgear CM600
Asus RT-AC66U B1

2 edits

MDA to sway0004

Premium Member

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Seeing as the smcd3gnv (if that is what you are using) is a 4x4 channel wireless gateway, it isn't recommended to be using that modem on a 100mbps+ tier. They could be limiting each channel to certain prioritized bandwidth and may be the cause of your slowdown (or congestion).

You have the right idea of getting a new modem, but unless comcast allows you to use customer owned eMTA's in your area (tm822g or tg862g) then you have to call them up or check the local service center with what they can offer you. I mention the tg862 as an option because out of all the gateways that have had problems on here, the arris tg862g has had the least (my friend is renting one without digital voice [for the router] and he has no packet loss or bandwidth issues).
sway0004
join:2005-04-29
Surprise, AZ

sway0004 to train_wreck

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Click for full size
some signals from the modem.
sway0004

sway0004 to MDA

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okay thanks for the help..im going to go tommorow first thing and see if i can swap for a better modem.

tshirt
Premium Member
join:2004-07-11
Snohomish, WA

tshirt

Premium Member

If those are typical signals, AND all connections are tight, you will likely want a tech visit to work on low downstream power.
The modem may not be the problem but more channels will become increasingly important.
sway0004
join:2005-04-29
Surprise, AZ

sway0004

Member

okay i will monitor on restarts i dated the signals on the image i posted.
sparky007
join:2011-08-25
Phoenix, AZ

sparky007 to sway0004

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to sway0004
YIKES!!

You got some low power on your downstream. Preferred power levels is +8 thru -8.

Your getting close to the low side of your modem disconnecting. -12 to -14 is usually the cut off point.

telcodad
MVM
join:2011-09-16
Lincroft, NJ

telcodad to sway0004

MVM

to sway0004
said by sparky007:

You got some low power on your downstream. Preferred power levels is +8 thru -8.

Your getting close to the low side of your modem disconnecting. -12 to -14 is usually the cut off point.

Your downstream SNRs are also close to the 33 dB minimum recommended for 256QAM carriers.

Those should improve when you signal levels are corrected.
sparky007
join:2011-08-25
Phoenix, AZ

sparky007

Member

Here is some more infor on what we're talking about..

»home.comcast.net/~modem/ ··· s_be.htm

»www.speedguide.net/faq_i ··· p?qid=78

»www.speedguide.net/artic ··· els-1197

EG
The wings of love
Premium Member
join:2006-11-18
Union, NJ

EG

Premium Member

FWIW, some of the signal specs / ranges in those links are older / outdated. CC plant specs are even tighter these days.
matt96teg
join:2005-01-31
Marysville, WA

matt96teg to sway0004

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Your signal is too low for one, usually want it above -8 to +8. Also you would be better off with a 8x4 or 16x4 modem from Comcast.