Looks nice Dak.... I would show you what we use but I can't seem to keep the monkey still that cranks it.
olo131
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#81
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Posted 06 March 2010 - 06:49 PM
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Posted 07 March 2010 - 09:08 AM
Surprised you don't have an eMTA and triple play Dak. Unless you have that eMTA somewhere else...
Right now the most issued gear is Arris tm702g for eMTA and Motorola SB6120. There's some others coming down the chain too, I think RCA makes one and Cisco DPC3000.
Right now the most issued gear is Arris tm702g for eMTA and Motorola SB6120. There's some others coming down the chain too, I think RCA makes one and Cisco DPC3000.
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Posted 07 March 2010 - 12:38 PM
QUOTE (System Tech Senior @ Mar 6 2010, 05:56 PM) <{POST_SNAPBACK}>
Nice set up Dak, looks clean. Cool pics too. Is that in your house?? We used to use the bottom Ambit also. We started using Ubee's, but it's a little different than the one in the picture.
Yep, that's in the mech room. The wife got upset about my messy wiring so I cleaned it up a bit.
Dak
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Posted 07 March 2010 - 12:46 PM
QUOTE (cypherstream @ Mar 7 2010, 11:08 AM) <{POST_SNAPBACK}>
Surprised you don't have an eMTA and triple play Dak. Unless you have that eMTA somewhere else...
I get my phone off the FTTH from a local telco coop of which I am a member. I get my Data and analog cable from the local cable TV provider. Since the competition heated up the cable company dropped my bill about 40 bucks, so I'll stay with them for that. Besides, I know what can go wrong with the HFC delivered VoIP and my confidence isn't that high yet!
Now that you say it though, I wonder why the EMTA wasn't included? You would think they would have wanted to push the equipment and technology into the house. Must be a price thing. they do do VoIP here, as well as NIDs on the houses. The NIDs are being phased out. I am assuming the cable telephone subscribers are getting combo's.
Dak
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#85
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Posted 07 March 2010 - 04:29 PM
Yea, phone via HFC is a nightmare if the node isn't tight. The smallest ingress will cause nightmares.
Jason C.
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Posted 07 March 2010 - 09:11 PM
QUOTE (cypherstream @ Mar 7 2010, 10:08 AM) <{POST_SNAPBACK}>
Surprised you don't have an eMTA and triple play Dak. Unless you have that eMTA somewhere else...
Right now the most issued gear is Arris tm702g for eMTA and Motorola SB6120. There's some others coming down the chain too, I think RCA makes one and Cisco DPC3000.
Right now the most issued gear is Arris tm702g for eMTA and Motorola SB6120. There's some others coming down the chain too, I think RCA makes one and Cisco DPC3000.
there is also a ambit D3.0 modem as well as a SMC networks one as well.
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Posted 09 March 2010 - 11:54 AM
QUOTE (System Tech Senior @ Mar 4 2010, 01:06 PM) <{POST_SNAPBACK}>
I'm sure we'll have some real soon for ya.. We had a horrible time when they released 64qam upstream here. If the upstream SNR was below 25 you could hang it up.. Most of the problems were bad drops, connectors or inside wiring, but we did have a few line issues. We've pretty much got all that worked out. Now on to SDV..
We have gotten ourselves cleaned up quite a bit with 3.0.... we get an automatically generated "plant fault" if x percentage of modems in a node reach an SNR of under 30.
Tell me System- do you guys have laptops and a program to check the status of a node or do you rely on dispatch for that?
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Posted 09 March 2010 - 01:35 PM
Oh yeah we use SMC stuff for "Business Class".
We use a program called watchtower for monitoring.
We use a program called watchtower for monitoring.
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Posted 09 March 2010 - 03:43 PM
QUOTE (x-star @ Mar 9 2010, 01:54 PM) <{POST_SNAPBACK}>
QUOTE (System Tech Senior @ Mar 4 2010, 01:06 PM) <{POST_SNAPBACK}>
I'm sure we'll have some real soon for ya.. We had a horrible time when they released 64qam upstream here. If the upstream SNR was below 25 you could hang it up.. Most of the problems were bad drops, connectors or inside wiring, but we did have a few line issues. We've pretty much got all that worked out. Now on to SDV..
We have gotten ourselves cleaned up quite a bit with 3.0.... we get an automatically generated "plant fault" if x percentage of modems in a node reach an SNR of under 30.
Tell me System- do you guys have laptops and a program to check the status of a node or do you rely on dispatch for that?
We have laptops and many tools to check the node with. We actually have too many tools lol.. Some of the programs are useful and some do the same thing as another just a little differently.
Jason C.
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Posted 11 March 2010 - 07:23 AM
QUOTE (cypherstream @ Mar 9 2010, 03:35 PM) <{POST_SNAPBACK}>
Oh yeah we use SMC stuff for "Business Class".
We use a program called watchtower for monitoring.
We use a program called watchtower for monitoring.
Cyper and I are on the same program then.
Tracking the SNR issues was a complete nightmare prior to getting laptos, wireless access, and good, useful programs. The laptops have paid for themselves many times over with the time they have saved by us not counting on dispatch to run and check scout for us all the time.
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Posted 11 March 2010 - 08:44 PM
we just launched mix mode 64/16 qam. we are fighting house ingress like crazy but another issue that we are told is causing problems for us is micro reflections. no one has information on it but will tell u in a heart beat that is our issue. and im talking about the he. so if any one can give more info on micro refletions that would be great. and system what do yall set the loopback up at on your 6940? do yall inject 38 and look for 37.
jinman
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Posted 12 March 2010 - 07:04 AM
QUOTE (jinman @ Mar 11 2010, 10:44 PM) <{POST_SNAPBACK}>
So if any one can give more info on micro reflections that would be great.
If you have micro reflections in the headend, you've got troubles!
Here is a good link: Ron Hranac and Micro Reflections
And here is another: Unterminated taps and micro reflections
And here for the really technical part: Lenear Distortions by Ron Hranac
Enjoy!
Dak
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Posted 12 March 2010 - 07:17 AM
QUOTE (jinman @ Mar 11 2010, 10:44 PM) <{POST_SNAPBACK}>
And system what do y'all set the loop-back up at on your 6940? do y'all inject 38 and look for 37.
Here is a guide that I got from SA. I have never had a problem following this to the letter.
6940_Field_guide.pdf 182.07K
25 downloadsWith a DFB transmitter, pad on the transmitter 9 dB, or any combination of pads that equals 9 db, between the return output pad on the RF module, and the pad at the transmitter.
For an FP transmitter, pad it it 5 dB.
For a DFB transmitter, inject 41 dB at a forward test point (reverse injection point) and measure 12 dB without test point compensation at the transmitter test point.
For an FP transmitter, inject 41 dB at a forward test point (reverse injection point) and measure 16 dB without test point compensation at the transmitter test point.
Your system could be engineered differently. so you should discuss this with the system engineer or the designer of your plant.
Hope this helps,
Dak
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#94
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Posted 14 March 2010 - 12:26 PM
Do you have any return path planning to share?
Here's a rough proposal
Here's a rough proposal
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#95
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Posted 30 March 2010 - 11:43 AM
Scratch that proposal.... actually the 6.4 MHz 64QAM will be lower in the spectrum due to "Group Delay". So flip flop that. 6.4 MHz 64QAM | 6.4 MHz 64QAM | 3.2 MHz 16QAM | 3.2 MHz QPSK,
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Posted 30 March 2010 - 08:52 PM
cypherstream, on 30 March 2010 - 11:43 AM, said:
Scratch that proposal.... actually the 6.4 MHz 64QAM will be lower in the spectrum due to "Group Delay". So flip flop that. 6.4 MHz 64QAM | 6.4 MHz 64QAM | 3.2 MHz 16QAM | 3.2 MHz QPSK,
A much better choice.
![:smilie_daumenpos[1]:](http://www.line-man.com/forums/public/style_emoticons/default/smilie_daumenpos[1].gif)
I was going to respond with just that suggestion, 
but I got lost in the new format. Some other post of mine pointed toward some articles from Ron Hranac that hinted at this.Good Luck,
Dak
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#97
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Posted 17 April 2010 - 10:57 AM
A good Article..... A must read
Broadband: Total Power and Channel Bonding
Ron Hranac
DOCSIS 3.0 is perhaps best known for its support of channel bonding — specifically, logical channel bonding — in which the downstream and upstream data payloads are spread across multiple individual quadrature amplitude modulation (QAM) channels. Channel bonding allows higher data rates between the cable modem termination system (CMTS) and cable modems than can be achieved when using just a single channel in each direction.
The transmission of multiple channels simultaneously between the CMTS and cable modems means that per-channel RF power generally decreases as the number of transmitted channels increases. This has caused a fair amount of confusion, especially because many headend combining networks were designed for single-channel-per-device operation. Most high-speed data installations in the home also were planned around the idea of only one transmitted upstream channel per modem
"The largest impact on upstream CNR is almost always the return fiber links."
Why do CMTS and modem per-channel RF power levels decrease when the number of transmitted channels goes up? The answer has to do with something known as total power.
Full article
http://www.cable360....lpen/40532.html
Broadband: Total Power and Channel Bonding
Ron Hranac
DOCSIS 3.0 is perhaps best known for its support of channel bonding — specifically, logical channel bonding — in which the downstream and upstream data payloads are spread across multiple individual quadrature amplitude modulation (QAM) channels. Channel bonding allows higher data rates between the cable modem termination system (CMTS) and cable modems than can be achieved when using just a single channel in each direction.
The transmission of multiple channels simultaneously between the CMTS and cable modems means that per-channel RF power generally decreases as the number of transmitted channels increases. This has caused a fair amount of confusion, especially because many headend combining networks were designed for single-channel-per-device operation. Most high-speed data installations in the home also were planned around the idea of only one transmitted upstream channel per modem
"The largest impact on upstream CNR is almost always the return fiber links."
Why do CMTS and modem per-channel RF power levels decrease when the number of transmitted channels goes up? The answer has to do with something known as total power.
Full article
http://www.cable360....lpen/40532.html
If you want to learn, you have to be willing to make a contribution & be ready to participate!
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#98
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Posted 19 April 2010 - 07:31 PM
We just cleared room for a 4th DOCSIS channel. Were well on our way to testing 100mbps downstream. RF CH 112,113,114,115(empty now, but soon D3).
What was on 115 (a Fox and MyNetwork TV HD multiplex) was able to be moved down to another spot that was freed up by analog reclamation.
Next week on the 27th, the remainder of our 2nd tier analog goes gone. We'll only offer Ch 2-27 in analog. Everything else is all digital, up to RF Ch 121. Were 750 MHz running up to 780 MHz.
We added 10 HD Channels after the first phase of our reclamation project. Have to tell you Travel Channel looks real good in HD. There's a boatload more to add. Were at about 50 HD's now, and 30 or so will be added in a few weeks.
What was on 115 (a Fox and MyNetwork TV HD multiplex) was able to be moved down to another spot that was freed up by analog reclamation.
Next week on the 27th, the remainder of our 2nd tier analog goes gone. We'll only offer Ch 2-27 in analog. Everything else is all digital, up to RF Ch 121. Were 750 MHz running up to 780 MHz.
We added 10 HD Channels after the first phase of our reclamation project. Have to tell you Travel Channel looks real good in HD. There's a boatload more to add. Were at about 50 HD's now, and 30 or so will be added in a few weeks.
Edited by cypherstream, 19 April 2010 - 07:35 PM.
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Posted 23 April 2010 - 11:04 AM
cypherstream, on 19 April 2010 - 07:31 PM, said:
We just cleared room for a 4th DOCSIS channel. Were well on our way to testing 100mbps downstream. RF CH 112,113,114,115(empty now, but soon D3).
What was on 115 (a Fox and MyNetwork TV HD multiplex) was able to be moved down to another spot that was freed up by analog reclamation.
Next week on the 27th, the remainder of our 2nd tier analog goes gone. We'll only offer Ch 2-27 in analog. Everything else is all digital, up to RF Ch 121. Were 750 MHz running up to 780 MHz.
We added 10 HD Channels after the first phase of our reclamation project. Have to tell you Travel Channel looks real good in HD. There's a boatload more to add. Were at about 50 HD's now, and 30 or so will be added in a few weeks.
What was on 115 (a Fox and MyNetwork TV HD multiplex) was able to be moved down to another spot that was freed up by analog reclamation.
Next week on the 27th, the remainder of our 2nd tier analog goes gone. We'll only offer Ch 2-27 in analog. Everything else is all digital, up to RF Ch 121. Were 750 MHz running up to 780 MHz.
We added 10 HD Channels after the first phase of our reclamation project. Have to tell you Travel Channel looks real good in HD. There's a boatload more to add. Were at about 50 HD's now, and 30 or so will be added in a few weeks.
My node just went Docsis 3.0 but not able to order just yet.
Downstream:
783MHz 789MHz 795MHz 801MHz
Upstreams:
33MHz 36.5MHz
my upstream changed from 36.5MHz which is channel 1 and 33MHz is channel 2 both are QAM16.
here they are making changes going hub by hub for Docsis 3.0 my hub is HUB 34 and the node is 3427. My hub is going to be completely finished on the 27th.
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Posted 05 May 2010 - 11:29 AM
They just switched on the 64QAM upstream. It does throw some modems marginal, even my tx power is a little higher than I'd like it. I think it's that dang 26 value tap. I'm about to put a lower value chip in it! argh..
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