Modem won't sync or loses sync

Modem won't sync or loses sync
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Subject Author Date
Modem won't sync or loses sync tabby55 06-17-2006
Posted by $Bill on June 23, 2006, 9:20 pm
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Culican wrote:

> Okay, should have done one at a time but both items are next to each
> other.
>
> After being out all day, I came home and checked: modem not synched.
> (Event log shows lost synch at 10:23 this AM and never regained.)
>
> I opened the Cox box on the side of my house to look, one line from
> across the street into the splitter and four out, into the house. This
> means each outlet inside is fed directly from the outdoor splitter
> Jiggled, all were tight. Jiggled a heck of a lot more to cram the
> cables back in the box and get it closed.
>
> Read something else on Google regarding bad grounds in dry (And AZ has
> been parched this whole year) weather when the ground dries out. As
> suggested I dumped water on the ground where the cold water feed for the
> house enters as the house ground is strapped directly to the pipe.
>
> Went inside, modem was up and running.
>
> Was it the jiggling of the cable, was it the water or was it voodoo?

How are your power levels now ?



NMFall 20%
Posted by Culican on June 23, 2006, 10:14 pm
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$Bill wrote:
> Culican wrote:
>
>> Okay, should have done one at a time but both items are next to each
>> other.
>>
>> After being out all day, I came home and checked: modem not synched.
>> (Event log shows lost synch at 10:23 this AM and never regained.)
>>
>> I opened the Cox box on the side of my house to look, one line from
>> across the street into the splitter and four out, into the house. This
>> means each outlet inside is fed directly from the outdoor splitter
>> Jiggled, all were tight. Jiggled a heck of a lot more to cram the
>> cables back in the box and get it closed.
>>
>> Read something else on Google regarding bad grounds in dry (And AZ has
>> been parched this whole year) weather when the ground dries out. As
>> suggested I dumped water on the ground where the cold water feed for the
>> house enters as the house ground is strapped directly to the pipe.
>>
>> Went inside, modem was up and running.
>>
>> Was it the jiggling of the cable, was it the water or was it voodoo?
>
> How are your power levels now ?
>
>
Tx Power        53.5        dBmV
Rx Power        -10.9        dBmV
Downstream SNR        36.5        dB

Very marginally better Rx, actually worse Tx. But I haven't lost sync
in almost a week now. Maybe I should actually pull the cables off the
splitter and plug them back in.

Posted by $Bill on June 24, 2006, 5:10 am
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Culican wrote:

>>How are your power levels now ?
>>
> Tx Power        53.5        dBmV
> Rx Power        -10.9        dBmV
> Downstream SNR        36.5        dB
>
> Very marginally better Rx, actually worse Tx. But I haven't lost sync
> in almost a week now. Maybe I should actually pull the cables off the
> splitter and plug them back in.

What are your cables ? RG6/58/59 ? How long are the runs (esp modem) ?

Did you find a grounding block out there prior to the splitter (or
maybe the splitter is grounded) ? What kind of splitter and what
do the markings indicate for Db loss ?

If all your cabling looks good and connecters are tight, Cox should
come out and clean up your signal gratis.

Posted by steve on August 8, 2006, 7:07 pm
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> Culican wrote:
>
>>>How are your power levels now ?
>>>
>> Tx Power 53.5 dBmV
>> Rx Power -10.9 dBmV
>> Downstream SNR 36.5 dB
>>
>> Very marginally better Rx, actually worse Tx. But I haven't lost
sync
>> in almost a week now. Maybe I should actually pull the cables off
the
>> splitter and plug them back in.
>
> What are your cables ? RG6/58/59 ? How long are the runs (esp
modem) ?
>
> Did you find a grounding block out there prior to the splitter (or
> maybe the splitter is grounded) ? What kind of splitter and what
> do the markings indicate for Db loss ?
>
> If all your cabling looks good and connecters are tight, Cox should
> come out and clean up your signal gratis.


> A 1/4 inch stinger is a failed QC bigger than Dallas. It should be
the width of a dime, or nickle if it is the drop from across the
street. What you want to do is get a 2 way splitter from anywhere,
make sure it is 1G rated. Cox OC uses to transmit Data on 453 Mhz or
was it 654 (?). Anyway, use the 2 way to split the drop to the 4 way
or new 3 way and the cable modem leg, terminate the old modem leg
with a 75ohm terminator. The modems autorange, they keep climbing in
transmit power until they hit the CMTS with the proper signal
strength. Pulling the RF (RF reset) resets this range back to a
default level and that is what you are probably seeing as a synced
signal.


Posted by Warren on June 18, 2006, 10:38 pm
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$Bill wrote:
> Gene S. Berkowitz wrote:
>
>> Do you know a good source for those terminators? I get blank stares
>> when I ask...
>
> Any electronics store - Fry's or possibly Radio Shack. Just a plain
> old
> 75 ohm F-type coax terminator - they're like a dime (10/$1) or so.
> You'll
> want to find them locally since postage will cost multiple times the
> cost
> of ten of them. If your ISP comes out, ask them for a few or go to
> their
> office and ask.

Radio Shack no longer carries them. I'd be surprised to find them a
Fry's, too. You'll have to go to a real electronics parts shop, not a
store aimed at the mass consumers.

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.

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