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Contributor
heatfan02
Posts: 9
Registered: ‎04-25-2011

Modem not working with cable splitter

The last couple of weeks, my modem hasn't been working consistently with a splitter. it will work for a couple of hours with the splitter. When it isn't working with the splitter, i have to connect the modem directly to the wall. After a couple of hours of being connected directly to the wall, i put the splitter in again and it will work for a couple of hours before i have to connect it directly to the wall again. I have been doing this alternating for a couple of weeks and im getting sick of it. I've tried 2 different splitters, so im pretty sure its not the splitter. Anyone know whats wrong?

Connection Expert
Joe
Posts: 7,130
Registered: ‎06-30-2003

Re: Modem not working with cable splitter

The signal must be a little off that get worst with that splitter on

please post signals from modem click this link

Contributor
heatfan02
Posts: 9
Registered: ‎04-25-2011

Re: Modem not working with cable splitter

I'm not sure which one im supposed to post. Downstream or upstream?

Cable Expert
JayInAlg
Posts: 12,046
Registered: ‎03-02-2007

Re: Modem not working with cable splitter

Please post

 

downstream power level

downstream signan to noise (SNR)

upstream power level

Contributor
heatfan02
Posts: 9
Registered: ‎04-25-2011

Re: Modem not working with cable splitter

This is with the splitter

 

Downstream Receive Power Level : -10.5 dBmV

Downstream SNR : 36.9 dB

Upstream transmit Power Level : 54.0 dBmV

Cable Expert
JayInAlg
Posts: 12,046
Registered: ‎03-02-2007

Re: Modem not working with cable splitter

Is that with the splitter or without?

 

Your signals are marginal as you posted.

 

Please share more on your wiring in the home like how many TV outlets, other splitters, and is this a single family home?  We need to figure out a way to increase the signal to that outlet, so you can add that splitter back in. 

Connection Expert
Joe
Posts: 7,130
Registered: ‎06-30-2003

Re: Modem not working with cable splitter


heatfan02 wrote:

This is with the splitter

 

Downstream Receive Power Level : -10.5 dBmV

Downstream SNR : 36.9 dB

Upstream transmit Power Level : 54.0 dBmV


that is bad

how is it without

Contributor
heatfan02
Posts: 9
Registered: ‎04-25-2011

Re: Modem not working with cable splitter

[ Edited ]

That  was with the splitter. Here are the signals without the splitter.

 

Downstream Receive Power Level : -6.2 dBmV

 

Downstream SNR : 37.8 dB

 

Upstream transmit Power Level : 51.4 dBmV

 

It is a single family home with 4 bedrooms and 1 living room all with tv's in them. I'm pretty sure each room has 1 cable outlet.

   



Contributor
heatfan02
Posts: 9
Registered: ‎04-25-2011

Re: Modem not working with cable splitter

anyone know what the problem is?

Connection Expert
EG
Posts: 44,212
Registered: ‎12-24-2003

Re: Modem not working with cable splitter

Yeah. There is too much attenuation in your line in the first place so you don't have enough wiggle room to allow for the additional loss that the splitter causes. It may be best to book a tech visit to investigate why and to correct the problem.

Cable Expert
JayInAlg
Posts: 12,046
Registered: ‎03-02-2007

Re: Modem not working with cable splitter

it looks like you probably have too much splitting going on for your 4 TV outlets plus the cable modem, causing your signals to be too low to the modem when you add  that extra splitter.

 

Let us know how many ports are on the splitter for the TV outlets.

 

Please check the splitter you have feeding the TV outlets.  If you have any TV outlets that are not being used, you should unhook them at the splitter and change the splitter to something with less ports so you have less loss.

 

What should be done is from the coax coming in from the ground block outside, it should go to a  2-way splitter first, one leg feeding the jack to the cable modem.  The other leg should go to the input on the splitter for the TV outlets. 

 

We can get creative to get the splitters arranged to supply enough signal for each outlet, just post what you have going on now, and if any TV outlets can be disconnected so the splitter loss can be reduced.

Bronze Problem Solver
Posts: 688
Registered: ‎06-27-2006

Re: Modem not working with cable splitter

You also might want to try a tap instead of a splitter.

Contributor
heatfan02
Posts: 9
Registered: ‎04-25-2011

Re: Modem not working with cable splitter

The modem was working for about 2 days with the splitter, and it's not working again. Here is the event log to see if anyone can get something out of it. Please if anyone knows any solutions, let me know.

 

Thu Apr 28 19:41:52 2011 Thu Apr 28 19:41:52 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:41:37 2011 Thu Apr 28 19:41:37 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:41:24 2011 Thu Apr 28 19:41:24 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:39:48 2011 Thu Apr 28 19:39:48 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:39:30 2011 Thu Apr 28 19:39:30 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:39:15 2011 Thu Apr 28 19:39:15 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:37:38 2011 Thu Apr 28 19:37:38 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:37:17 2011 Thu Apr 28 19:37:17 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:37:04 2011 Thu Apr 28 19:37:04 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:35:28 2011 Thu Apr 28 19:35:28 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:35:08 2011 Thu Apr 28 19:35:08 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:34:52 2011 Thu Apr 28 19:34:52 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:33:16 2011 Thu Apr 28 19:33:16 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:32:58 2011 Thu Apr 28 19:32:58 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:32:46 2011 Thu Apr 28 19:32:46 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:31:11 2011 Thu Apr 28 19:31:11 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:31:02 2011 Thu Apr 28 19:31:02 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:30:51 2011 Thu Apr 28 19:30:51 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:29:14 2011 Thu Apr 28 19:29:14 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:29:00 2011 Thu Apr 28 19:29:00 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:28:51 2011 Thu Apr 28 19:28:51 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:27:14 2011 Thu Apr 28 19:27:14 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:26:57 2011 Thu Apr 28 19:26:57 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:26:45 2011 Thu Apr 28 19:26:45 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:25:08 2011 Thu Apr 28 19:25:08 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:25:01 2011 Thu Apr 28 19:25:01 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:24:47 2011 Thu Apr 28 19:24:47 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Thu Apr 28 19:23:12 2011 Thu Apr 28 19:23:12 2011 Warning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Thu Apr 28 19:23:00 2011 Thu Apr 28 19:23:00 2011 Critical (3)No Ranging Response received - T3 time-out
Thu Apr 28 19:22:52 2011 Thu Apr 28 19:22:52 2011 Critical (3)Received Response to Broadcast Maintenance Request, But no Un...
Time Not EstablishedTime Not EstablishedWarning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Time Not EstablishedTime Not EstablishedCritical (3)DHCP FAILED - Discover sent, no offer received;CM-MAC=f0:7b:c...
Connection Expert
EG
Posts: 44,212
Registered: ‎12-24-2003

Re: Modem not working with cable splitter

[ Edited ]

FWIW, those log entries only show one single event that is of a 20 minute duration so nothing of a really conclusive nature can be deemed from them, sorry. Those T-3 errors however do possibly show a RF related issue which has already been pointed out here.