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CM500 Slow Download Speeds and Download light blinking green

paperboy201
Tutor

CM500 Slow Download Speeds and Download light blinking green

Firmware Version V1.01.05

 

For the last few days, download speeds have been painfully slow and only the download light is steadily blinking green. All other lights are solid as they should be. 

 

I have done factory resets and all troubleshooting possible including everything that was recommended by the ISP. I use Comcast Xfinity and pay for 75 mbps.

 

Current tests show .18Mbps Download and ~7Mbps Upload through hardline connection to Modem. ISP has looked at everything else and can only point to the router. Has anyone else had the

Model: CM500|16x4 DOCSIS 3.0 Cable Modem
Message 1 of 10
DarrenM
Sr. NETGEAR Moderator

Re: CM500 Slow Download Speeds and Download light blinking green

Hello paperboy201

 

Have you bypassed your router and connected direct to the modem and done a speed test?

 

DarrenM

Message 2 of 10
paperboy201
Tutor

Re: CM500 Slow Download Speeds and Download light blinking green

Yes I have. The .18 Mbps speed test was conducted via hardline directly to modem.

Light has now been continuously blinking green for 5 days.
Message 3 of 10
DarrenM
Sr. NETGEAR Moderator

Re: CM500 Slow Download Speeds and Download light blinking green

Hello Paperboy201

 

If you had your ISP check everything and you tried to factory reset the modem I would suggest to contact support if you are still under warranty could be a hardware issue.

 

https://www.netgear.com/support/contact.aspx?cid=wmt_netgear_organic

 

DarrenM

Message 4 of 10
paperboy201
Tutor

Re: CM500 Slow Download Speeds and Download light blinking green

Go figure that the light stopped blinking late last night and I was not even afforded the chance to work towards a warranty claim. I'm waiting for the modem to act up again if it should do so.  Since I don't know what exactly happened and I'm not convinced that it won't happen again, should I still submit a claim?

 

I do not know now what the issue was and I may not ever know. If the modem has issues again I will come back to this thread as the solution is still unknown. If anyone else has had similar issues with a similar modem then your insight and experience would be much appreciated.

 

Thank you for your help Darren.

Message 5 of 10
rightintel
Aspirant

Re: CM500 Slow Download Speeds and Download light blinking green

MY upstream light is blinking occasionally now. I logged in and I power cycled, and it went away/came back. Now I rebooted after logging in, and so far it seems ok. Log says things like "critical" and "warning".

Message 6 of 10
rightintel
Aspirant

Re: CM500 Slow Download Speeds and Download light blinking green

My CM500 has recently started the same thing(upstream light blinking). Connectivity/speeds don't SEEM to be affected, and a reboot always temporarily stops it.

Message 7 of 10
DarrenM
Sr. NETGEAR Moderator

Re: CM500 Slow Download Speeds and Download light blinking green

Hello rightintel

 

I would contact your ISP have them check the levels and connection of the modem also if you have any cable splitters on your cable line try to remove them and connect directly to the wall.

 

DarrenM

Message 8 of 10
rightintel
Aspirant

Re: CM500 Slow Download Speeds and Download light blinking green

No splitters, connections are tight.

Here's the modem log:

1970-1-1, 00:00:20 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:21 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:22 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:30 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:36 Notice (6) Honoring MDD; IP provisioning mode = IPv4
1970-1-1, 00:00:38 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.0;CM-VER=3.0;
2016-12-27, 16:52:03 Notice (6) TLV-11 - unrecognized OID;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-27, 16:52:46 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 11:19:00 Warning (5) Dynamic Range Window violation
2016-12-29, 11:20:16 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 11:24:44 Warning (5) Dynamic Range Window violation
2016-12-29, 11:25:30 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 11:25:44 Warning (5) Dynamic Range Window violation
2016-12-29, 11:26:00 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 11:27:58 Warning (5) Dynamic Range Window violation
2016-12-29, 12:03:08 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 12:04:06 Warning (5) Dynamic Range Window violation
2016-12-29, 12:04:22 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 12:05:21 Warning (5) Dynamic Range Window violation
2016-12-29, 12:06:37 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-29, 12:06:51 Warning (5) Dynamic Range Window violation
2016-12-30, 11:31:12 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-30, 11:59:35 Warning (5) Dynamic Range Window violation
2016-12-31, 04:52:00 Error (4) DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2016-12-31, 17:24:58 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-3, 16:52:00 Error (4) DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 11:40:05 Warning (5) Dynamic Range Window violation
2017-1-8, 11:41:21 Critical (3) Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 11:59:16 Warning (5) Dynamic Range Window violation
2017-1-8, 14:31:11 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:31:14 Warning (5) MDD message timeout;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:31:15 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:31:18 Warning (5) MDD message timeout;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:32:35 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:32:38 Warning (5) MDD message timeout;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:32:39 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:32:43 Critical (3) SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
2017-1-8, 14:32:44 Warning (5) MDD message timeout;CM-MAC=40:5d:82:f0:55:b8;CMTS-MAC=00:14:f1:e5:d0:cc;CM-QOS=1.1;CM-VER=3.0;
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Message 9 of 10
hu7hydro
Aspirant

Re: CM500 Slow Download Speeds and Download light blinking green

Recently I have similar problem with cm500. I have to reboot the modem every day to restore the 100mbp download speed. Otherwise it's around 12mbps.

Also, the downstream blinks occationally

Message 10 of 10
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