Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 | 3 | 4 | 5 | 6 | 7 
1375 posts

Uber Geek
+1 received by user: 131


  Reply # 1065060 13-Jun-2014 17:25
Send private message

raytaylor:
eXDee:
myfullflavour:
Behodar: I wonder whether Chorus will match this. Current Chorus wholesale price appears to be $275, but matching it wouldn't be great for the Gigatown initiative. Hmm...

Edit: Chorus plan is 1000 both ways. Not sure what the upload speed of UFF's new one is.


At this stage 20Mbps upload, subject to change with further testing.


Wait what, 20Mbps up?

Jump in the time machine back to the 128k upload days.


Yep I just ran a quick calculation- If 128kbit could get you 4.5mbit down, then you are going to require closer to 29mbits to get the full gigabit of download speed.
So I think the marketing department has just made an announcement without talking to the techs first. Though as they say, they are going to do some testing to fine tune the product


it's around 3.5 megabit without SACK from memory.  windows may have been worse with using sack than linux, but on linux having more than one flow at once or slow senders could get in the way of sack timeouts. (it acks every secnd packet, but only if it comes in quick enough after the first)

these problems aren't likely to be as bad now as peoples general sending speeds are better, and SACK is implemented everywhere.   the problem more is with combined upload.  

3355 posts

Uber Geek
+1 received by user: 1775

Trusted
Spark NZ

  Reply # 1065063 13-Jun-2014 17:26
Send private message

raytaylor:
eXDee:
myfullflavour:
Behodar: I wonder whether Chorus will match this. Current Chorus wholesale price appears to be $275, but matching it wouldn't be great for the Gigatown initiative. Hmm...

Edit: Chorus plan is 1000 both ways. Not sure what the upload speed of UFF's new one is.


At this stage 20Mbps upload, subject to change with further testing.


Wait what, 20Mbps up?

Jump in the time machine back to the 128k upload days.


Yep I just ran a quick calculation- If 128kbit could get you 4.5mbit down, then you are going to require closer to 29mbits to get the full gigabit of download speed.
So I think the marketing department has just made an announcement without talking to the techs first. Though as they say, they are going to do some testing to fine tune the product


Except the 4.5mbit figure always bandied about is Just Plain Wrong.

Cheers n

 
 
 
 


3091 posts

Uber Geek
+1 received by user: 509

Trusted

  Reply # 1065066 13-Jun-2014 17:28
Send private message

TimA:
PhantomNVD: Key question here is why do fibre and cable offerings still mimic the adsl ratio rather than sdsl anyway?


95% of users dont need the upload speeds...
With fibre it isnt like ADSL where it only has a small spectrum to use. Hence Asymmetrical.
Just a trend anyway.


GEPON as it currently stands does have a fixed almost symmetrical bandwidth on older equipment (so either 1.25gbit down/1gbit up)
The newer stuff is 2.5gbit down / 1gbit up.

The best way I can describe it is that with ADSL, you have a fixed radio band in the copper that can be used, so they prioritise more frequencies for downstream data. Its done out of necessity.

With the fibre, they can push data in both directions using different colors of laser light, but by using a cheaper laser for the upstream, they can make the ONT units in each house cheaper to produce so you get the same result - Asymmetric speeds. 

It comes down to equipment cost, and backward compatibility.





Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




1375 posts

Uber Geek
+1 received by user: 131


  Reply # 1065068 13-Jun-2014 17:30
Send private message

Talkiet:
raytaylor:
eXDee:
myfullflavour:
Behodar: I wonder whether Chorus will match this. Current Chorus wholesale price appears to be $275, but matching it wouldn't be great for the Gigatown initiative. Hmm...

Edit: Chorus plan is 1000 both ways. Not sure what the upload speed of UFF's new one is.


At this stage 20Mbps upload, subject to change with further testing.


Wait what, 20Mbps up?

Jump in the time machine back to the 128k upload days.


Yep I just ran a quick calculation- If 128kbit could get you 4.5mbit down, then you are going to require closer to 29mbits to get the full gigabit of download speed.
So I think the marketing department has just made an announcement without talking to the techs first. Though as they say, they are going to do some testing to fine tune the product


Except the 4.5mbit figure always bandied about is Just Plain Wrong.

Cheers n


i imagine cell overhead may be complicating matters too, but i can't even remember what bitrate adsl it had, .. do you have any numbers for how much a normal non window scaling no timestamps no sack can do on 7616 downstream and whatever was normal for upload on those connections.

actually from memory upload was 160 on 128kbit.  and it'll use two cells per ack packet i imagine.

for anyone who's interested, i found this on google:
http://wand.cs.waikato.ac.nz/~513/2006/readings/adsl-2.pdf

which seems to suggest that pppoa/vc-mux has 96 bytes overhead, but that routed ip on vc-mux would have 48 bytes.  cell sizes are 53 bytes with 5 byte header.  so it's more akin to 64kbit upload of acks.. 

3091 posts

Uber Geek
+1 received by user: 509

Trusted

  Reply # 1065072 13-Jun-2014 17:38
Send private message

colinbowern:
mercutio: people don't /need/ fibre.


Throw 4K video into the mix and you may just very well need it as ADSL2+ is just a bit too close to the bitrate required.  Then again, we'll probably need a Netflix content server in the country before that becomes a reality too. :)


I predict the regional internet exchanges will have netflix caches (https://www.netflix.com/openconnect) but if i remember right, you also need something like a constant 100mbit to feed it with new content updates etc. The hardware appliance looks like a backblaze pod which i think is pretty cool.

I also suspect vodafone is using chorus' multicast function to provide the sky television over fibre service, and like the satellite i guess they can dynamically change the bitrates between channels or programmes so it should be able to balance out quite nicely.

I cant remember what the specific SD/HD bitrates are, but if there was a budget of 400mbits on 2.5gbit node, then thats hardly noticable when split between 32 users.
400mbits will get you 50 channels at 4mbits plus 20 channels at HD 10mbits. Dont know the bitrates with 4k but multicast should make the delivery still very efficient.




Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




25575 posts

Uber Geek
+1 received by user: 5352

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 1065323 14-Jun-2014 08:02
Send private message

Yes Vodafone do use multicast. My understanding is their total multicast bandwidth for all channels is just over 800Mbps. 

25575 posts

Uber Geek
+1 received by user: 5352

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 1065326 14-Jun-2014 08:09
Send private message

bbqroast: Anyone got an idea of what type of network they're running for last mile.

From what I understand Chorus runs GPON with 2.4/1.2 gbps connected to a number of houses (around 30?). Obviously, that might not work for gigabit connections, whats UFF using?. 


Chorus splits depend on the year of deployment as the architecture has changed significantly with the move from cabinets to ABFATs deeper into the node. Current architecture revolves around 16 way splits which can be easily changed and also allows P2P to be easily offered as well.

1 | 2 | 3 | 4 | 5 | 6 | 7 
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

UFB killer app: Speed
Posted 17-Nov-2017 17:01


The case for RSS — MacSparky
Posted 13-Nov-2017 14:35


WordPress and Indieweb: Take control of your online presence — 6:30 GridAKL Nov 30
Posted 11-Nov-2017 13:43


Chorus reveals technology upgrade for schools, students
Posted 10-Nov-2017 10:28


Vodafone says Internet of Things (IoT) crucial for digital transformation
Posted 10-Nov-2017 10:06


Police and Facebook launch AMBER Alerts system in NZ
Posted 9-Nov-2017 10:49


Amazon debuts Fire TV Stick Basic Edition in over 100 new countries
Posted 8-Nov-2017 05:34


Vodafone VoIP transition to start this month
Posted 7-Nov-2017 12:33


Spark enhances IoT network capability
Posted 7-Nov-2017 11:33


Vocus NZ sale and broadband competition
Posted 6-Nov-2017 14:36


Hawaiki reaches key milestone in landmark deep-sea fibre project
Posted 4-Nov-2017 13:53


Countdown launches new proximity online shopping app
Posted 4-Nov-2017 13:50


Nokia 3310 to be available through Spark New Zealand
Posted 4-Nov-2017 13:31


Nest launches in New Zealand
Posted 4-Nov-2017 12:31


Active wholesale as Chorus tackles wireless challenge
Posted 3-Nov-2017 10:55



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.