DaneJasper
Sonic.Net
Premium,VIP
join:2001-08-20
Santa Rosa, CA
clubs:
| reply to guhuna
Re: First e.SHDSL loop up
At a similar distance, ADSL2+ has been demonstrated 16/1, and e.SHDSL at 4/4 - interesting trade-offs.
ADSL2+ can be bonded over two pairs for about double the speed, and e.SHDSL bonds (using "Ethernet in the First Mile" technology) up to eight pairs.
-Dane |
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JohnInSJ
Premium
join:2003-09-22
San Jose, CA
 ·SONIC.NET
| said by DaneJasper  :At a similar distance, ADSL2+ has been demonstrated 16/1, and e.SHDSL at 4/4 - interesting trade-offs. So is the ADSL2 uplink limited to 1mbit?
Gah... I could do with 6/2 or 5/5 (cable? isn't cable now in the ballpark of 10mb?)
Basically, the 6/786 is pretty close to good, but I still run into uplink congestion when trying to stream my own media out to my mobile clients. .7mbit isn't quite enough, something in the 2-4mbit range is, however (he says, seeing his daughter's internal video stream (SDTV) running at 4mbit over our internal network...)
Interesting indeed... |
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DaneJasper
Sonic.Net
Premium,VIP
join:2001-08-20
Santa Rosa, CA
clubs:
| In theory, it's possible with ADSL2+ Annex M to deliver as much as 3Mbps upstream, and 24Mbps downstream. That said, we're not yet testing Annex M, and I'm not sure if our hardware/firmware combination yet support it. I also wouldn't expect real world performance to match up to the maximum of the specifications.
Our Ethernet in the First Mile e.SHDSL products are symmetric, with link speeds from 1.5Mbps up to 45Mbps - depending upon distance an the number of pairs. Because outbound bandwidth costs so much more than inbound, and because they use more pairs and have more expensive CPE, these products will likely be of most interest to businesses.
Lots of items in flux right now, including the technology, real world testing, and product design and positioning. Fun stuff!
-Dane |
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DaneJasper
Sonic.Net
Premium,VIP
join:2001-08-20
Santa Rosa, CA
clubs:
| For folks interested in some of the technical details, here's some interesting links:
ADSL2+ overview: »en.wikipedia.org/wiki/ITU_G.992.5
ADSL2+M overview: »en.wikipedia.org/wiki/ITU_G.992.5_Annex_M
EFM overview: »en.wikipedia.org/wiki/Ethernet_i···rst_mile
Our current deployment supports bonding of up to two pairs of ADSL2+, and up to eight pairs using EFM. You can do the math. 
-Dane |
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mike421
Premium
join:2008-03-27
Sheridan, WY
| just noticed this thread here and decided to go ahead and reply.
Here where I work we turned up our first e.shdsl (EFM) circuit to a customer just under a year ago (May 2007).
been running smooth and solid too.
two loops bonded, effectively supplying 10mbps symmetric bandwidth for the customer.
loop distance in this situation was under 4000feet
each loop is running good at 5696kbps symmetric line speed with SNR margins between 10db to 15db and attenuation about 12db
(using Adtran DSLAM equipment and Adtran CPE)
I would agree that the EFM product is only appealing to business customers due to the pricing.
Residential customers we instead connect on adsl2+
(and of course a lot of small businesses will even opt for adsl2+ specially if it is not mission critical)
EFM is certainly a very great way to get 10mbps to a business that is essentially in the 'downtown area'.
Once we start to add distance to the equation of course it drops off pretty quick.
from my experience around here in our area, a substantial portion of the copper wiring is 26AWG and as a result it can be a stretch to try to push good high speeds over much distance on such small wire.
Not sure what kind of line distance limits we're really going to market our EFM out to in these areas.
It does certainly appear to nicely match it's name 'Ethernet First Mile' as it is supplying real world 10mbps within the first mile from the CO. |
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