[zebuds]

I have had comcast for 4 years and for the last two years my comcast connection had been dropping. At the time I didn;t take it as a big deal because I have bad connection but not it's way too frequent to ignore. I have gotten a new router and exchanged a modem from comcast. Basically at a random time of the day internet just goes off. To fix it, I have to go up to the router and disconnect and reconnect the router. Even sometimes it doesn't fix the connection so now to fix the dropped internet everytime I do the following procedure: Unplug ethernet cable from modem --> Unplug the modem --> unplug the cable that connects the modem and a Y-extension for TV and internet. Then I just plug everything back in one at a time. This fixes the problem every single time.

Motorola modem: (new one)
Software Version: SB5120-2.19.0.16-SCM00-NOSH
Hardware Version: 1
MIB Version: II
GUI Version: 1.0
VxWorks Version: 5.4

Cisco E-1200 v1 router (new one)

those are the new equipment I got about 3 months ago and the problem is still consistent. I think I will call in comcast now but I thought I should get a professional opinion and maybe I missed something that you guys can see, so please reply if you can help me and ask me if you need any logs or somethin , Thanks.

[zebuds]

Before anyone asks me i guess I'll post my modem log already so you can see it before you reply.

Time	                         Priority	      Code	     Message
2012-09-11 18:44:11	7-Information		       DS multicast is not mapped to SAID
2012-09-11 18:44:11	7-Information	B605.10	Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID
2012-09-11 18:44:11	7-Information	B601.0	SA Map State Machine Started
2012-09-11 18:43:55	7-Information		        SNMP: Working in SNMP V1/2c Only NmAccess mode
2012-09-11 18:43:53	7-Information	        	INITIALIZATION COMPLETE - MODEM IS OPERATIONAL
2012-09-11 18:43:53	7-Information	B401.0	Authorized
2012-09-11 18:43:53	7-Information		        SEC: Co-Signer CVC from configuration file was verified
2012-09-11 18:43:50	7-Information		        REGISTRATION COMPLETE - Waiting for Operational status
2012-09-11 18:43:50	7-Information	        	REG: Capability type <15> isn't supported by CMTS
2012-09-11 18:43:50	7-Information	        	Registration file - downloaded
2012-09-11 18:43:48	7-Information	        	Trying to download Configuration file ...
2012-09-11 18:43:48	7-Information	         	Time of day - retrieved
1970-01-01 00:00:21	7-Information	        	DHCP - parameters acquired
1970-01-01 00:00:21	7-Information		       DHCP: ACK: Setting (*) CM TFTP Boot file: d11_m_sb5120_bronze_c01.cm
1970-01-01 00:00:21	7-Information	          	DHCP: Setting CM IP address to: 96.163.146.64
1970-01-01 00:00:21	7-Information	        	DHCP: Setting (*) CM Syslog Server address to: 0.0.0.0
1970-01-01 00:00:21	7-Information	        	DHCP: Setting (*) CM Time Server address to: 69.252.65.201
1970-01-01 00:00:21	7-Information	        	DHCP: Setting (*) CM Subnet mask to: 255.255.248.0
1970-01-01 00:00:21	7-Information        		DHCP: Setting (*) CM Gateway address to: 96.163.144.1
1970-01-01 00:00:21	7-Information	        	DHCP: OFFER: Setting (*) CM TFTP Boot file:
d11_m_sb5120_bronze_c01.cm

So, thts the log, I'll tell you that I don;t know one bit of wht tht says so, yeah....

[TerryNet]

After the cable service enters your residence there should be one high quality two-way splitter with one side going directly to the modem and the other side going to everything else. Not clear from your description if that is what you have.

Have you tried to determine where the disconnects occur (before modem, between modem and router, etc.)?

What do the LEDs on the modem and router indicate?

[zebuds]

Yes, the setup is exactly as you mentioned.

I'm 100% sure the router is fine. I really want to say that the modem is fine but there is no real way for me test it. But I think the modem is also fine, maybe its the internet or the cable..?

The LEDs on router or modem don't really change at all when internet cuts out, I just reset the connection everytime.

[DoubleHelix]

It's very easy to determine if the modem or the router is the issue. Connect directly to the modem, and see if you have the same problem.

If you have any kind of splitter coming out of the wall to connect both your TV and modem to the same coax jack, then you do not have the correct cabling setup, and that could certainly cause a problem.