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Author Topic: How does a WBC ISP modify a customer's broadband package?  (Read 473 times)

Terrydaktal

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How does a WBC ISP modify a customer's broadband package?
« on: January 12, 2019, 09:19:55 AM »

So a customer purchases a fibre package from the ISP, how does the ISP then 'turn on' the relevant port for the customer? Is this done by the ISP informing BTw who informs openreach and a technician goes to the closest PCP cab to the address of the customer and connecting to the FTTC tie pairs for the line that gives the correct circuit on 17070? How is this port then configured and negotiated back to BTw and the ISP? For instance, do the FTTC cab ports always correspond to the CVLAN of the port and for instance the technician connects the user to port 3 and they inform BTw that the customer has been connected to port 3 meaning CVLAN 3. I think SVLANs could be assigned purely per cabinet or maybe they are remapped to a service based on packet contents or .1p values inserted by the DSLAM -- the packets ingress on the L2S with CVLANs which get mapped to SVLANs for the interface, I think it requires something like setting CVLAN 2 on interface 1 to push SVLAN 3 for instance -- this would have to be modified by BT openreach, then I assume they inform BTw of the SVLAN / CVLAN and BTw inform the ISP of it so it can be figured on their DHCP server for option 82 Vendor-Specific Layer 2 CircuitID and perhaps a RemoteID for the DSLAM Relay agent. Reference : https://www.juniper.net/documentation/en_US/junose15.1/topics/concept/dhcp-relay-option-82-suboptions-overview.html
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/qinq-tunneling-qfx-series-els.html
https://www.reddit.com/r/networking/comments/439uta/what_is_the_purpose_of_dhcp_option_82_from_isp/

BTw then, i assume, configures their BRAS to map a certain CVLAN/SVLAN to a MPLS pseudowire from the BRAS to the ISP Edge, reference: https://lists.gt.net/nsp/foundry/52164

Seems like a logical, albeit naive, suggestion, but if anyone has some insider knowledge as to how it happens then please inform.

Let's say a customer upgrades to superfast fibre, how does the speed profile get changed by the ISP? Does the ISP have to go to BTw and get them to adjust the DLM profile speed band for that port or does anything else happen? I know VLAN bandwidth policing could be a possibility.

Let's say a customer downgrades to ADSL2 -- does a technician have to come to the PCP cab again and disconnect? It makes sense that they'd free up a port for another user but if the cabinet is not near capacity it would seem like waste of resources to do so, until it was necessary and users could be disconnected in batch. I assume the ISP informs BTw of the change and they inform openreach that the port is no longer in use, they could remotely disable the port at the DSLAM for the CVLAN but how does the modem now sync with the MSAN in the exchange? The other option I thought of was to put the customer on an extra slow DLM speed band that resembles ADSL to save the complication of rewiring at the cabinet. Does anyone have anything to add on this procedure?

Thanks
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j0hn

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Re: How does a WBC ISP modify a customer's broadband package?
« Reply #1 on: January 12, 2019, 11:44:11 AM »

No idea of the ins and outs but the FTTC DSLAMs have nothing to do with BT Wholesale.
They only do the backhaul from the exchange onwards and only if the ISP chooses to use them.

For say a Talktalk FTTC customer it's entirely in the hands of BT OpenReach until it gets handed over to Talktalk at the exchange.
BT Wholesale aren't involved.

With exchange based ADSL services it's BT Wholesale who control their own MSANs, and the LLU operators control their own MSANs.

Nobody on these forums works specifically in this field so I suspect the vast majority of your questions above will either go unanswered or will lack some of the detail you seek.

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j0hn

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Re: How does a WBC ISP modify a customer's broadband package?
« Reply #2 on: January 12, 2019, 11:48:02 AM »

I'll answer the little I can

Quote
Let's say a customer downgrades to ADSL2 -- does a technician have to come to the PCP cab again and disconnect?

This is an absolute necessity.

If the customer cancels service completely they can be left jumpered to the FTTC cabinet if there is still spare capacity. This means it can be remotely reactivated.
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kitz

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Re: How does a WBC ISP modify a customer's broadband package?
« Reply #3 on: January 12, 2019, 03:55:33 PM »

Quote
Let's say a customer upgrades to superfast fibre, how does the speed profile get changed by the ISP? Does the ISP have to go to BTw and get them to adjust the DLM profile speed band for that port or does anything else happen? I know VLAN bandwidth policing could be a possibility.

Short version

ISP places an order for FTTC.  Openreach advises ISP of live date so the SP can lift any speed restrictions and set it to the relevant rate for the product they ordered.
Openreach swaps over line to FTTC.  Customer connects to FTTC.

RAMBO detects sync now coming from an FTTC DSLAM's element manager as opposed to the MSAN in exchange.   
THE RAP part of RAMBO send notification via NCAS to the bRAS, which in turn can communicate with the DSLAM/MSAN to set DLM profile.
RAP process sets IP profile. BTw's RAP process sends delta report to SP advising them of the IP profile.

Note DLM system & RAP system is not the same, but both are functions performed by the RAMBO box which communicates directly with NCAS (Network Configuration & Assignment System).

More info - DLM system






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kitz

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Re: How does a WBC ISP modify a customer's broadband package?
« Reply #4 on: January 12, 2019, 04:31:33 PM »

Sorry I've tried reading the first part of your query several times, but it's just making my head spin and I'm not quite sure what you are getting out.
The ISP has nothing to do with the SVLANs.   As far as FTTC goes, all the mapping is done by Openreach who have their own NCAS system.  The ISP doesn't turn on the port that is also done by Openreach.

The beauty of NCAS is that everything can be set up or configured remotely as far as mapping goes.   Just needs an Openreach engineer to change things in the PCP to hook up the tie pair to connect to the FTTC DSLAM.  Once that is done then the modem should sync to the FTTC DSLAM.   The DSLAM is dumb in that it will let you sync, but until the NCAS system allocated a correct path allocated to your ISP you won't get Internet connectivity.
I think Openreach has a specific name for their NCAS but can't recall it atm.   BlackSheep may know.

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CarlT

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Re: How does a WBC ISP modify a customer's broadband package?
« Reply #5 on: January 14, 2019, 07:21:37 AM »

Gentle reminders:

BT Wholesale don't use a pseudowire for each customer. They are delivered as PPP sessions over L2TP tunnels not native Ethernet. BRAS and LTS are present for aggregation.

Migration to and from FTTC is a new provisioning of the respective service.

FTTC and ADSL have completely different termination points at the customer end: one on an Openreach DSLAM, the other a BT Wholesale owned MSAN.

The respective BT Wholesale SINs are available covering services.

See earlier responses to another thread.
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kitz

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Re: How does a WBC ISP modify a customer's broadband package?
« Reply #6 on: January 15, 2019, 10:42:43 PM »

See earlier responses to another thread.

Link added for sake of completeness - See here
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