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611 posts

Ultimate Geek

# 214740 26-May-2017 08:49
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Does anyone with knowledge of UFB plans know what the difference is between Bitstream 2 and 3a, specifically in terms of service availability/faults/time to fix?


Since both are delivered via GPON and we don't need multiple VLANs is there anything else that would justify paying the 3a premium?


This is for a Chorus area.

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1609 posts

Uber Geek

  # 1788556 26-May-2017 09:29
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Start here and here

611 posts

Ultimate Geek

  # 1788586 26-May-2017 10:06
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Thanks, I've found the information I needed.


256 posts

Ultimate Geek

  # 1788729 26-May-2017 13:31
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Depends on the LFC


All LFC's have a default 48 hour on BS2/2a


Both Chorus and UFF BS3/3a/3b have a 6 hour respond.


You can also buy SLAs on BS2 but generally BS3 makes more sense in these cases as they come with the SLA

4127 posts

Uber Geek

  # 1788858 26-May-2017 17:33
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Interesting to see the "congestion free" part is still there in BS3 with 200 and 1Gbps options out there now.

Will they move you to your own OLT or something to guarantee congestion free? Also, why buy CIR if it's "congestion free"?

Or am I not understanding at all....

1374 posts

Uber Geek

  # 1788860 26-May-2017 17:42
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chevrolux: Also, why buy CIR if it's "congestion free"?

Or am I not understanding at all....

CIR usually infers an end to end service while they are merely differentiating the PON segment as congestion 




Wonder what the DSLAM is for?








256 posts

Ultimate Geek

  # 1788925 26-May-2017 21:06
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BS3 is only (CIR) committed bandwidth with a pretty strict SLA


BS3a and 3b (UFF) are (CIR) committed + best effort (EIR - Excess information rate)


BS2/2a generally has a CIR of 2.5Mb up and down. There are a few plans that have 5Mb and 10Mb CIR.


The EIR is the same for BS2 as BS3a/b. All best effort but there is very very little congestion on the UFB network. Likewise with ADSL2+ and VDSL, in the case of ADSL2+ and VDSL if they hit 95% usage for 5 mins on the backhaul they need to upgrade the capacity. Does not apply to legacy ADSL network with people stuck on BUBA /conklins (that number is decreasing slowly as they upgrade the last 400 cabinets of these)


There is 2.4Gb download and 1.2Gb up shared between all the users. Chorus are not putting more than 16 customers per PON for any new builds. UFF and Enable and some of the older Chorus stuff could be 16, 24 or 32.


BS3/a/b has a range of CIR from 2.5Mb up to 100Mb. Depending on the plan the EIR can be the remaining part up to 1Gb.


LFC won't deliver the BS2 and BS3 on the same ONT.


But other than that I believe it is the same network as you can switch between BS2 and BS3 without a tech needing to do anything (this is the case of Chorus, I have not churned between BS3 and BS2 for the other LFC yet)


I deal with mostly business customers and during the day with a 100 UFB circuits we see between 100Mb and 400Mb for all of them combined. The odd spike if someone does a big download. The biggest user of traffic is backup traffic and after hours that can spike up a lot.


I am not sure why they say DSLAM in the Chorus picture on how it works. There isn't any DSL involved. It goes back to an ISAM with a GPON/POLT card. I don't fully know the inside of the Chorus network but there is legacy network for ADSL/VDSL/HSNS and there new UFB/NGA network. They are most separate but there is some cross over. Generally UFB goes back to the nearest exchange (not cabinet) but there are a few exceptions where there is a GPON/POLT card in a cabinet.

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