fuzzdawg7
join:2006-10-01
Silverdale, WA
1 edit | Upgrade SB5120 to SB5101 ProblemsHi all, I've recently been experiencing dropped connections randomly and have done a bit of research, determining my old SB5120 needed replacement. It is currently running at 61 dbmV (!) but manages to establish a connection.
I purchased a new SB5101 as a replacement from Newegg, and after calling my cable company (Wave Broadband) had them change the MAC address so I could get online. The problem is that the SB5101 will not establish a send connection with the ISP and times out with the following errors (they say the modem is bad):
1970-01-01 00:02:09 3-Critical R002.0 No Ranging Response received - T3 time-out (US 21)
1970-01-01 00:01:58 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:01:25 3-Critical R005.0 Started Unicast Maintenance Ranging - No Re sponse re ceived - T3 time-out
I tried today to get a tech support visit since the SB5120 is operating so high of power and they said it has a "strong signal" so it should be good. I know they are full of crap since sometimes in order to fetch web pages I have to reload them a couple of times occasionally.
Thanks for any help that anyone can provide. | |
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NoVA_CoxUser
Stand back from the cage -- The RF bites
Premium
join:2004-07-06
Alexandria, VA
 ·Cox HSI
| Re: Upgrade SB5120 to SB5101 Problems Your issue is that your modem is having to transmit WAY outside of the DOCSIS specs. (the 61 db upstream)
For some reason your ISPs headend cant "hear" your modem.
Could be wiring issues inside your house, or cable plant problems outside.
Do you possibly have an amp inside your house (w/o upstream amplification)? | |
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 | fuzzdawg7
join:2006-10-01
Silverdale, WA
| Re: Upgrade SB5120 to SB5101 Problems I don't think I have an amplifier inside my house - how would I know?
The community I live in has pretty old cable wiring, so it could be the entire community - I snooped on my neighbor's modem and it was sending at 55 dbmV, so I'm leaning toward a site wide issue. | |
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NoVA_CoxUser
Stand back from the cage -- The RF bites
Premium
join:2004-07-06
Alexandria, VA
·Cox HSI
| Re: Upgrade SB5120 to SB5101 Problems said by fuzzdawg7  : ... I snooped on my neighbor's modem and it was sending at 55 dbmV, so I'm leaning toward a site wide issue ... A distinct possibility. Just keep "pounding" on your cableco to correct your too high upstream.
You are Tx'ing WAY above maximum the DOCSIS spec; something they can't (or at least shouldn't) ignore. | |
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| | | yuhuang
join:2009-03-27
| Re: Upgrade SB5120 to SB5101 Problems said by NoVA_CoxUser :said by fuzzdawg7 : ... I snooped on my neighbor's modem and it was sending at 55 dbmV, so I'm leaning toward a site wide issue ... A distinct possibility. Just keep "pounding" on your cableco to correct your too high upstream. You are Tx'ing WAY above maximum the DOCSIS spec; something they can't (or at least shouldn't) ignore. | |
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