Topic 'Re: Here is a Qwest DOC explaining the interference problem ...' in forum '' - dslreports.com http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21580358 en Sat, 11 Feb 2012 14:05:38 EDT Sat, 11 Feb 2012 14:05:38 EDT Re: Here is a Qwest DOC explaining the interference problem ... http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21627345 As ADSL travels from the CO on an F1 (feeder pair) it eventually connects to an F2 (distribution pair). The connection is made using a copper pair jumper in a "Crossbox". The F2 is what eventually goes down your street and connects to a drop wire that connects to an SNI (station network interface) located on or in your home or business.
In the world of FTTN the IPDSLAM is placed beside the Crossbox. An ADSL2+ circuit is connected via jumpers directly to your F2, the pair that physically feeds your home. F2 feed cables can be quite large however, as they go through your neighborhood they begin to shrink, generally speaking the F2 going down your backyard or alley is likely to be 25 to 50 pairs, telephone plant is grouped into 25 pair complement. For FTTN to work and provide ROI to Qwest the IPDSLAM must be placed within ~2500 feet of your home. ADSL2+ achieves high download transfer rates on short loops after 2500 feet it begins to act like its elder sister ADSL.
Now back to the POWER interference issue. ADSL begins losing power as soon as it leaves the DSLAM in the CO on the F1 pair. By the time the ADSL circuit reaches the Crossbox and is connected to the F2 it might very well be on its last leg, having little power left to mitigate the effects of a nearby ADSL2+ circuits. The ADSL2+ circuit that is connected at the same Crossbox leaves at FULL power able to destroy its older sibling.
Qwest also mentions binder separation which is a technical joke. To have appropriate separation between TWO ADSL and ADSL2+ circuits with differing POWER LEVELS as described above, the F2 feeder cable would need to be at least 100 pairs (four 25 pair compliments). With the single ADSL circuit in the first 25 pair bundle and the ADSL2+ circuit located in either two of the last 25 pair bundles. The reason this is a joke is that telephone plant was designed to offer 1.5 copper pair lines to each home. A normal block has a single 25 pair to 50 pair feed, which provides no way to separate a single ADSL circuit from a single ADSL2+ circuit.
If you notice I keep referring to SINGLE ADSL and SINGLE ADSL2+ circuits. This is intentional as it is far more likely that the F2 going through your neighborhood carries more than ONE single ADSL or ADSL2+circuit. One ADSL2+ circuit installed on a F2 pair, as described, would cause POWER interference issues on ALL ADSL circuits located within 75 pairs of it. Again, the issue is POWER. The ADSL2+ circuit is simply overpowering the ADSL circuit.
To alleviate the issue Qwest could simply adjust the power output of the IPDSLAM. Which would make the FTTN project fail as the ADSL2+ circuits would not be able to deliver the desired download speeds with reduced power.
So this is not a marketing issue it is a POWER issue. If the CLECS want to survive they will need to fight for interconnect rights to the FTTN network, which in my opinion is a losing legal battle. ]]> http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21627345 Tue, 23 Dec 2008 19:16:29 EDT Re: Here is a Qwest DOC explaining the interference problem ... http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21587641 said by mrhuggles:

what exactly is IP-based dsl and why isnt it effected?
A full resale-only deal rather than the ISP providing the backhaul.]]> http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21587641 Mon, 15 Dec 2008 21:28:52 EDT Re: Here is a Qwest DOC explaining the interference problem ... http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21581713 said by mrhuggles:

what exactly is IP-based dsl and why isnt it effected?
My impression from reading that Doc is that that is what they are calling FTTN.

Remote Terminal (RT) deployment of Internet Protocol (IP) broadband or also referred to as Fiber-to-the-Node (FTTN) where the serving Central Office has ATM-based DSL are overlay areas and may cause interference or degradation of the ATM-based DSL service in some cases.

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Ask yourself one question: 'Do I feel lucky?' Well, do ya punk?]]> http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21581713 Sun, 14 Dec 2008 19:49:06 EDT Re: Here is a Qwest DOC explaining the interference problem ... http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21581700 http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21581700 Sun, 14 Dec 2008 19:46:36 EDT Re: Here is a Qwest DOC explaining the interference problem ... http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21581246 http://www.dslreports.com/forum/Re-Here-is-a-Qwest-DOC-explaining-the-interference-problem-21581246 Sun, 14 Dec 2008 18:06:30 EDT Here is a Qwest DOC explaining the interference problem ... http://www.dslreports.com/forum/Here-is-a-Qwest-DOC-explaining-the-interference-problem-21580358
»www.qwest.com/wholesale/download···3_08.doc


Issue Description: Service Interference
Certain Qwest network upgrades or changes may impact end user’s existing Asynchronous Transfer Mode (ATM)-based Qwest Commercial Broadband Service functionality that is provisioned on a stand-alone basis or with either Resale voice service or Qwest Local Services Platform® (QLSP®) voice service.

The occurrence of this Digital Subscriber Line (“DSL”) interference happens only when certain network conditions occur, including at some Central Office or Remote Terminal (“CO/RT”) overlay sites where there is a power disparity between the distant CO streams and the RT data streams in shared binder groups. The RT DSL can degrade the CO DSL if in the same binder group.

Remote Terminal (RT) deployment of Internet Protocol (IP) broadband or also referred to as Fiber-to-the-Node (FTTN) where the serving Central Office has ATM-based DSL are overlay areas and may cause interference or degradation of the ATM-based DSL service in some cases.
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Description of Solution
Upon receipt of a repair ticket for broadband interference, Qwest will endeavor to address or correct the service interference as detailed below and may result in moving the existing DSL connection to a new binder group at the CO/RT.

In certain instances, Qwest may determine that the existing DSL network configuration providing the broadband service to the end user location is no longer compatible with the new network configuration. Resulting service interference cannot be corrected without a broadband service change.

If Qwest determines that a broadband service change can correct the interference issue, you may submit, and Qwest will accept, a service request (for speeds of 1.5Mbs or greater) to change the existing broadband service to an IP broadband) based Qwest Broadband option detailed below. Note: these options are otherwise not available under Qwest Commercial Broadband Service and repair ticket number must be provided..
• ATM broadband speeds of 1.5Mbs or greater can be changed to same IP broadband speed.
• ATM broadband speeds of 1.5Mbs or greater can be upgraded to a higher IP broadband speed, new rates will apply to the upgraded speed including Internet access.
• ATM broadband speeds less than 1.5Mbs can be changed, but must be changed to an IP broadband speed of 1.5Mbs, new rates will apply to the new speed.
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Internet Access
If it is necessary to make a change to IP-based DSL service, Qwest will provide Internet access. Qwest will waive the charge for Qwest Internet Basic Internet access service when the speed is 1.5Mbps or the same speed as the former ATM-based DSL. In some Qwest states this wavier of the Qwest Internet Basic may be reflected as $.01 on your bill.

Call the Tech Support Center at 888-777-9569 to obtain the newly assigned credentials.

If service is changed to IP broadband service, it will be your duty to work with your end-user customer to ensure e-mail (web-based) and other application services you provide are still available.

If the end-user moves to IP broadband services, static IP addresses are available only from Qwest. Ordering of static IP' addresses is available at »www.qwest.net/account_tools/sign···t_tools/ within Account Manager tool. Static IP’s may be ordered only after broadband order is complete and cannot be ordered with an LSR. It is your responsibility to manage any request for static IP’s with your end user. Giving credential information to your end user may allow your end user to order these directly. These charges will be billed through the summary bill.

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In cases where an Interference issue has been identified by Qwest, Qwest procedures are to correct the interference issue as follows:
• Identify the facilities where the interference exists.
• Determine if the service interfered with is a C.O. Based DSLAM.
• Determine if Qwest has installed a Remote DSLAM in the Network.
• Determine if the Service being interfered with is in the same binder group as the interferer Service.
• Move the interfered with service to a different binder group.
The above process will be followed until binder group separation is no longer possible. At this point the CLEC will be given the opportunity to follow the process for an IP broadband alternative.

]]> http://www.dslreports.com/forum/Here-is-a-Qwest-DOC-explaining-the-interference-problem-21580358 Sun, 14 Dec 2008 14:15:53 EDT