dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
1079
share rss forum feed


YukonHawk

join:2001-01-07
Patterson, NY
Reviews:
·Comcast

8 channels down Still 2 channels up

I recently checked my Cisco 3008 modem and noticed I had 8 channels. Here are the levels. To me the power levels look really low. Any thoughts on how they look. Has anyone else noticed that they have a 8 channels working now?

Thank you...

Model: Cisco DPC3008
Vendor: Cisco
Hardware Revision: 1.0
MAC Address:
Bootloader Revision: 2.3.1_R3
Current Software Revision: d3000-v302r125532-120517a-L2VPN-CMCST
Firmware Name: d3000-v302r125532-120517a-L2VPN-CMCST.bin
Firmware Build Time: May 17 11:31:04 2012
Cable Modem Status: Operational
Wireless Network:


Cable Modem State

DOCSIS Downstream Scanning: Completed
DOCSIS Ranging: Completed
DOCSIS DHCP: Completed
DOCSIS TFTP: Completed
DOCSIS Data Reg Complete: Completed
DOCSIS Privacy: Enabled

Downstream Channels

Power Level: Signal to Noise Ratio:
Channel 1: 0.8 dBmV 38.3 dB
Channel 2: 0.4 dBmV 38.3 dB
Channel 3: 0.6 dBmV 38.0 dB
Channel 4: 0.9 dBmV 38.6 dB
Channel 5: 1.0 dBmV 38.7 dB
Channel 6: 1.0 dBmV 38.2 dB
Channel 7: 0.8 dBmV 37.9 dB
Channel 8: 0.9 dBmV 38.1 dB

Upstream Channels

Power Level:
Channel 1: 39.5 dBmV
Channel 2: 39.5 dBmV
Channel 3: 0.0 dBmV
Channel 4: 0.0 dBmV


n_w95482
Premium
join:2005-08-03
Ukiah, CA

The upstream is maybe a hair on the low side, but nothing that I would worry too much about. The rest looks good.

As for 8 downstream channels, there's a sticked thread for it. I believe the OP compiles reports from various users/areas so you may want to post in there as well.

How's the DPC3008 working out for you?
--
KI6RIT



EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:9
reply to YukonHawk

said by YukonHawk:

Has anyone else noticed that they have a 8 channels working now?

Yeah. I've had eight downstream carriers for over a year now on my local system. Your downstream power levels are fine. The closer to 0 dB the better.


YukonHawk

join:2001-01-07
Patterson, NY
reply to n_w95482

Thanks for taking a look for me and confirming. The 3008 has been rock solid solid since I got it back in March of this year. I am running a tunnel from HE for IPV6. I do get some bottlenecks every now and then. Other than that speeds are great.



YukonHawk

join:2001-01-07
Patterson, NY
reply to EG

Awesome. Thanks.


plat2on1

join:2002-08-21
Hopewell Junction, NY
reply to YukonHawk

yeah the upgrade was last Friday morning went from 4 DS with no upstream bonding to 8 DS with upstream bonding like you show.


Extide

join:2000-06-11
84129
reply to n_w95482

said by n_w95482:

The upstream is maybe a hair on the low side, but nothing that I would worry too much about. The rest looks good.

Heh you think those are low you should see mine!

Power Level: Signal to Noise Ratio:
Channel 1: 2.0 dBmV 37.1 dB
Channel 2: 1.4 dBmV 36.7 dB
Channel 3: 2.3 dBmV 36.8 dB
Channel 4: 2.7 dBmV 37.1 dB
Channel 5: 2.6 dBmV 37.0 dB
Channel 6: 2.4 dBmV 37.3 dB
Channel 7: 1.4 dBmV 37.1 dB
Channel 8: 0.0 dBmV 0.0 dB

Upstream Channels
Power Level:
Channel 1: 23.8 dBmV
Channel 2: 24.2 dBmV
Channel 3: 0.0 dBmV
Channel 4: 0.0 dBmV

Also I am the only person I have ever seen with 7 down. Even despite these really low upstream power levels my connection works fine. They have always been this low in-fact. I assume there is some sort of amplifier on the plant right near me. (My cable modem is the only thing plugged into the cable, no splitters, I have DTV for TV)


YukonHawk

join:2001-01-07
Patterson, NY

Great readings!



AnonMan

@comcast.net
reply to YukonHawk

Yeah, I have never understood the US being too low bit.

I think Bright House for example doesn't have a lower limit really.

If it is noisy and needs to be heard more the system will normally compensate by raising it automatically, otherwise I would think the lower the better. Less power to send your modem needs to do.



telcodad

join:2011-09-16
Lincroft, NJ
kudos:7

said by AnonMan :

Yeah, I have never understood the US being too low bit.

I think Bright House for example doesn't have a lower limit really.

If it is noisy and needs to be heard more the system will normally compensate by raising it automatically, otherwise I would think the lower the better. Less power to send your modem needs to do.

Yeah, I didn't understand why it's recommended that upstream signal levels be at least +35 dBmV (»Comcast High Speed Internet FAQ »What should my Signal Levels be?) initially either, but then I found out that the CMTS only tries to keep all upstream carriers arriving at it to be at the same power level (0 dBmV?), and does not optimize each one's level for the best upstream Signal-to-Noise Ratio (uSNR).

If your upstream signal levels are too low, then that might cause any upstream ingress noise to severely degrade the uSNR at the CMTS and cause problems.

Extide

join:2000-06-11
84129

Yeah, I have never been concerned about my signals. I mean, my connection works great! It is interesting though that I have never seen anyone with an upstream level that low. I wonder what my uSNR is, never had the need to ask.