broadband connection types de-mystified

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trakman

162 posts

Master Geek

#101033 23-Apr-2012 16:57

1. what are all the different broadband connection types?
e.g. BUBA, EUBA, ULL

2. and what are the pros and cons of each?

3. what does the 0kbps mean etc

4. bonus points for mentioned interleaving

Sure, most home users wouldn't care about this, but I am curious :D

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374 posts

Ultimate Geek

#613832 23-Apr-2012 17:52

Starter for 10

UBA - The Unbundled Bitstream Access products (UBA) are regulated broadband products provided by Chorus. They allow Service Providers to provide broadband, using ADSL technology, to their customers, with or without a phone line which shares the same physical access line.

BUBA - Basic Unbundled Bitstream Access (offered since 2007)EUBA - Enhanced Unbundled Bitstream Access (offered from 2008)

EUBA is an Ethernet provided by Chorus ISAM's, where as BUBA provided by all other DSLAM's (ASAM's, Conklin's etc)
EUBA supports different classes of service, and allows Service providers to offer real-time applications, like voice, bundled with best-efforts internet.

ULL - Unconditioned Local Loop is where a third party rents the copper line between an exchange and a customer premises.

Interleaving - http://en.wikipedia.org/wiki/Interleaving

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trakman

162 posts

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#613836 23-Apr-2012 17:56

Thank you qraider!

sbiddle

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#613837 23-Apr-2012 18:00

EUBA is also vastly superior because it's ethernet backhaul rather than ATM, and (currently) doesn't have any handover dimensioning. People keep talking about the Commerce Commission regaulated 45kbps per user dimenstionig, which currently doesn't exist with EUBA, but does with BUBA.

alexx

867 posts

Ultimate Geek

#613838 23-Apr-2012 18:02

qraider:

ULL - Unconditioned Local Loop is where a third party rents the copper line between an exchange and a customer premises

I'm pretty sure it's Unbundled Local Loop.

This means the services (voice or data) are unbundled from the local loop physical bearer (copper pairs). Prior to ULL you got offered a phone/data service and the physical bearer together... you couldn't just take the bits you wanted.

#include <standard.disclaimer>

trakman

162 posts

Master Geek

#613840 23-Apr-2012 18:03

Sbiddle can you explain what handover dimensioning is and the rationale behind needing it

grudge

266 posts

Ultimate Geek

#613854 23-Apr-2012 18:34

EUBA also has 3 options for interleaving - Off, Low or High. Whereas BUBA only has Off and On to the best of my knowledge.

insane

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#613859 23-Apr-2012 18:52

qraider:
EUBA is an Ethernet provided by Chorus ISAM's, where as BUBA provided by all other DSLAM's (ASAM's, Conklin's etc)
EUBA supports different classes of service, and allows Service providers to offer real-time applications, like voice, bundled with best-efforts internet.

Just to clarify,

a Customer on a BUBA connection still connects to the new Alcatel 7302 ISAMs where available so there is no difference there. An EUBA customer however cannot be connected off the old DSLAMS.

EUBA comes in two different formats, EUBA0 which would be the most common, and then EUBA90, 180, etc which is a double vlan tagged service with a limited CIR on the second cVID.

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sbiddle

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#613914 23-Apr-2012 20:33

trakman: Sbiddle can you explain what handover dimensioning is and the rationale behind needing it

Handover demensioning is simply that an ISP's handover connection to Chorus is dimensioned to an average of 45kbps per user over 15 minute period. Higher rates are available if ISP's wish to purchase them.

Why does it exist? Because ADSL2+ in New Zealand is a fully regulated offering with prices and access conditions set by the Commerce Commission.

nigelj

856 posts

Ultimate Geek

#614859 25-Apr-2012 12:27

qraider: EUBA - Enhanced Unbundled Bitstream Access (offered from 2008)
EUBA is an Ethernet provided by Chorus ISAM's, where as BUBA provided by all other DSLAM's (ASAM's, Conklin's etc)
EUBA supports different classes of service, and allows Service providers to offer real-time applications, like voice, bundled with best-efforts internet.

Something I'd be interested in from someone in the know, is what are the barriers to get connected onto an EUBA service, talking to Telecom today they said that there "compatibilities" that a line had to meet, but AFAIK the only barriers are that you are connected to EUBA compatible equipment and an EUBA compatible plan.

So, other than ISAM & plans what are the other requirements?

sbiddle

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#614942 25-Apr-2012 15:13

EUBA also features maximum attenuation figures, something that doesn't exist with UBA. In essence you will only get a EUBA connection if Chorus determine that you will get a adequate quality connection.

Any ADSL2+ modem will work over a EUBA connection using PPPoA. If you do have a modem that supports VLAN10 on the WAN interface (what many people term a "EUBA compatible modem") you can do native PPPoE from your modem.

nigelj

856 posts

Ultimate Geek

#614962 25-Apr-2012 15:34

sbiddle: EUBA also features maximum attenuation figures, something that doesn't exist with UBA. In essence you will only get a EUBA connection if Chorus determine that you will get a adequate quality connection.

Now that is interesting, so essentially it's similar to how Chorus look at VDSL connections, any idea what the magic number for EUBA is, or is it more closely guarded secret than the VDSL attenuation?

CUnl

26 posts

Geek

#615092 25-Apr-2012 18:48

nigelj:
sbiddle: EUBA also features maximum attenuation figures, something that doesn't exist with UBA. In essence you will only get a EUBA connection if Chorus determine that you will get a adequate quality connection.

Now that is interesting, so essentially it's similar to how Chorus look at VDSL connections, any idea what the magic number for EUBA is, or is it more closely guarded secret than the VDSL attenuation?

I've yet to see an EUBA connection be rejected due to adequate quality - not saying it doesn't happen, it may just be rare. I've successfully provisioned EUBAs with attenuations of 30db+ without issue.
The only times I've seen EUBA rejected when there is only an ATM backhaul from the DSLAM, but this is usually detected through the Prequal system prior to ordering.

When ordering DSL circuits, you specifically order the type: BUBA/EUBA/WVS - so if you order a type thats not possible, the order gets rejected, opposed to dropped to a lower quality service IE: EUBA->BUBA.

VDSL has an absolute ceiling of 10.8dB Attenuation .. which is non negotiable ... we've tried, and lost :P

Another Acronym for the collection:
WVS: Wholesale VDSL Service. Runs over the same backhaul as EUBA.

hamish225

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#615108 25-Apr-2012 19:11

How does one tell if their connection is one with the 45Kbps cir?

*Insert big spe*dtest result here*

Ragnor

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#615237 26-Apr-2012 02:38

hamish225: How does one tell if their connection is one with the 45Kbps cir?

For DSL the path your connection/data takes looks roughly like this:

Your line > cabinet/exchange > backhaul > handover point > handover connection > (transit to) ISP network > ISP network > ISP domestic and international transit

The 45kbit minimum roughly applies to the backhaul part above unless your ISP has purchased a higher grade minimum.

In practice the backhaul from a cabinet or exchange these days is usually multiple Gigbit fibre so you're unlikely to ever be getting only the minimum guaranteed CIR due to the backhaul.

Exceptions are rural or other rare cabinets/exchanges that haven't yet been upgraded.

The handover connection doesn't use the same kind of minimum CIR system as the backhaul, for BUBA the handover connection was/is dimensioned (limited) to a certain max bandwidth based on the number of customers.

If an ISP had a large number of heavy users it was possible for their handover connection to become congested.

For EUBA/HSNS handover no dimensioning has been applied and doesn't look like it will. Practically all ISP's use EUBA for new DSL connections where possible and have migrated their existing customers.

Most started using EUBA a couple of years ago.

These days if you have slow peak time performance it's likely to be because you ISP is running a high contention ratio (bandwidth vs customers) on their international or domestic transit not because of the Chorus network.

trakman

162 posts

Master Geek

#616703 28-Apr-2012 18:31

CUnl:
I've yet to see an EUBA connection be rejected due to adequate quality - not saying it doesn't happen, it may just be rare. I've successfully provisioned EUBAs with attenuations of 30db+ without issue.
The only times I've seen EUBA rejected when there is only an ATM backhaul from the DSLAM, but this is usually detected through the Prequal system prior to ordering.

CUnl what ISP do you work for?
how can I get an EUBA connection?
I've changed from Telecom to Orcon and I'm still getting exactly the same poor speeds, half the speed of ADSL1.

What are my options.

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