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Distinguished Sage
Distinguished Sage
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Message 11 of 31

Re: Does ADSL always come from the exchange. Exchange only line.

VDSL DSLAMS are not allowed to be provided in exchange buildings for technical reasons. Hence a cabinet is sometimes provided adjacent to the exchange to enable former EO lines to obtain VDSL service. If you are connected to a cabinet close to the exchange then you have theoretical access to FTTC, however, if you are too far from the cabinet it will not be available to you. ADSL reaches much further than VDSL. All flavours of ADSL are fed from the exchange. Jumpers are just connecting wires within the cabinet and just refers to them being left in situ.
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DiggerOfTrenches
Contributor
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Message 12 of 31

Re: Does ADSL always come from the exchange. Exchange only line.


@licquoricewrote:
VDSL DSLAMS are not allowed to be provided in exchange buildings for technical reasons. Hence a cabinet is sometimes provided adjacent to the exchange to enable former EO lines to obtain VDSL service. If you are connected to a cabinet close to the exchange then you have theoretical access to FTTC, however, if you are too far from the cabinet it will not be available to you. ADSL reaches much further than VDSL. All flavours of ADSL are fed from the exchange. Jumpers are just connecting wires within the cabinet and just refers to them being left in situ.

Great I get all that ta. Crystal clear. Tell me if you've had enough.

Next question 'Jumpers are just connecting wires within the cabinet and just refers to them being left in situ'

Connecting what 2 things?

After 26 + engineers to house and about 15+ who 'worked on the network' should they not have been removed at some point in the process if they are unnecessary?


My neighbors all BT all ADSL2(plus) have no jumpers. If I get them removed it can't make things worse can it?

Two left in sounds like a bridge tap to me?

If I believe Openreaches explanation of 'bridge tap'.


Erroneous piece of cable attached at some point to your line going nowhere.

BrTap.jpg

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Distinguished Sage
Distinguished Sage
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Message 13 of 31

Re: Does ADSL always come from the exchange. Exchange only line.

Yes, it will be jumpers connecting to the tie cable in the copper PCP that goes to the fibre cabinet and could be construed as a bridge tap if on ADSL rather than connecting to a VDSL DSLAM (in which case the jumper is required). It may have been removed but the records not updated.

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DiggerOfTrenches
Contributor
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Message 14 of 31

Re: Does ADSL always come from the exchange. Exchange only line.


@licquoricewrote:
ADSL DSLAMs are sited in exchanges, VDSL DSLAMs are sited in cabinets. ADSL is never served from a cabinet, there is no technology present to do so. ADSL circuits will be routed through the copper PCP not the associated DSLAM cabinet.


Just read bridge tap post. Message understood. Ta.

 

The technology exists.

HuDslam1.jpghuDslam2.jpg


But BT as an ISP chose not to use it as they have an old Huawei DSLAM in the exchange.

This can't be correct because, in theory, I can by ADSL2+ from another ISP.

So old Huawei DSLAM must be therefore owned by Openreach.

They can't have the same setup in every exchange can they?

Sounds very expensive, improper use of technology and unique across net work.

I know we are talking about Openreach but the above seams highly improbable but not impossible?

 

 

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Distinguished Sage
Distinguished Sage
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Message 15 of 31

Re: Does ADSL always come from the exchange. Exchange only line.

VDSL from ALL suppliers is fed from the same DSLAM in the cabinet. ADSL is fed from the exchange where each LLU provider will have their own DSLAMs.

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DiggerOfTrenches
Contributor
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Message 16 of 31

Re: Does ADSL always come from the exchange. Exchange only line.

Penny has dropped. Light bulb on etc ...

Will update post later/tomorrow with my version(the same as yours with references hopefully SIN 495). If you could comment on this please.

Just need to find ADSL(0)Max SIN.

I'm getting there thanks for your patience.

Later. Ta.
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DiggerOfTrenches
Contributor
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Message 17 of 31

Re: Does ADSL always come from the exchange. Exchange only line.


Time please Ladies and Gentlemen.

https://www.btplc.com/SINet/SINs/pdf/385v3p0B.pdf

Having read enough SINs today to keep dreaming of 1 and 0's for weeks. I normally dream in Hex dim pob.

The sins seam to be in a state of temporal flux not that they weren't in the past.

As if change is on the wind. Maybe May? Sooner?

Entering the Internet Time Machine now, may be some time, to seek old SINs.


Will report back yesterday.


Wo Lesley. Drink up.


I'm only having a giraffe. Polished digital titanium, how do I put a 3 pin plug on it?

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DiggerOfTrenches
Contributor
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Message 18 of 31

Re: Does ADSL always come from the exchange. Exchange only line.


@licquoricewrote:

Yes, it will be jumpers connecting to the tie cable in the copper PCP that goes to the fibre cabinet and could be construed as a bridge tap if on ADSL rather than connecting to a VDSL DSLAM (in which case the jumper is required). It may have been removed but the records not updated.


Back from 2007 is this my ADSL today?

How1.jpg

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DiggerOfTrenches
Contributor
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Message 19 of 31

Re: Does ADSL always come from the exchange. Exchange only line.

Or has it evolved , 07-14 , to this?

MorpedDslam.jpg

And is now, 14-on, arranged like this? Coal delivered by train 10G Fiber, Truck = 1G Fiber, Horse = ?Mb Coax.

nowThis.jpg

 

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DiggerOfTrenches
Contributor
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Message 20 of 31

Re: Does ADSL always come from the exchange. Exchange only line.

CP            = Communications Provider ISP
DSL         = Digital Subscriber Line
FTTP       = Fibre To The Premises
NTP         = Network Terminating Point

SMPF     = Shared Metallic Path Facility

AP            = Aggregation Point
DSLAM  = Digital Subscriber Line Access Multiplexer
MSAN    = Multi-Service Access Node
BRAS      = Broadband Remote Access Server
BEA         = Broadband Edge Aggregator
RADIUS = Remote Authentication Dial In User Service [IETF]
LNS         = L2TP Network Server
L2TP       = Layer 2 Tunnelling Protocol
EP            = Extension Path

MSIL       = Multi Service Interconnect Link
PTA          = PPP Termination and Aggregation
PPP         = Point-to-Point Protocol [IETF]
LCP         = Link Control Protocol [IETF]
CHAP     = Challenge Handshake Authentication Protocol [IETF]
NCP        = Network Control Protocol
BGP        = Border Gateway Protocol
IP             = Internet Protocol [IETF]
ATM        = Asynchronous Transfer Mode

IETF        = Internet Engineering Task Force

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