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DaneJasper
Sonic.Net
Premium,VIP
join:2001-08-20
Santa Rosa, CA
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| reply to justin
Re: FlexLink Ethernet, T1, Dual-T1 and ADSL2+
2Base-TL supports 5.7Mbps symmetric per pair. With EFM, we bond eight pairs, for a max of 45Mbps/45Mbps. However, in the real world, we expect to see that max rarely. This is why we limit to 30Mbps.
For ADSL2+, the max is 24Mbps/1Mbps, but the fastest product we are selling is 15/1, for the same reason. The max real world sync we have seen on a customer loop is 19Mbps, so it makes little sense to market the max.
We anticipate offering bonded ADSL2+ in future.
-Dane | |
justin
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| oh ok now I see, I didn't realize the higher speeds were offered with bonding.
do you think this product mix effectively puts old fashioned T1 offerings out of business in the CO if you are within range? or is it as it was with SDSL: t1 for fast turnaround on failures and sla and so on, sdsl for value? | |
DaneJasper
Sonic.Net
Premium,VIP
join:2001-08-20
Santa Rosa, CA
clubs:
| said by justin  :oh ok now I see, I didn't realize the higher speeds were offered with bonding. do you think this product mix effectively puts old fashioned T1 offerings out of business in the CO if you are within range? or is it as it was with SDSL: t1 for fast turnaround on failures and sla and so on, sdsl for value? Yes, where EFM products are available, they're always going to be superior to old school T1. The technology is far more advanced, and the reliability and link margin that comes with that is great.
In reality, old fashioned repeatered T1 isn't used anymore, and hasn't been for years. T1s today are delivered over HDSL. For more on this evolution, see »www.arcelect.com/HDSL3698.htm
For years, we've been bonding T1s to deliver faster access - generally limited to eight T1s for 12Mbps/12Mbps, as that's the most commonly available CPE configuration.
EFM 2Base-TL is carried over e.SHDSL, with an Ethernet PHY, allowing for similar bonding. But, with e.SHDSL's 5.7Mbps maximum versus HDSL's 1.5Mbps, the result is much more interesting. Some FAQs on 2Base-TL EFM Copper can be found here: »www.ethernetinthefirstmile.com/faq_cop.html
Regarding SLA - we are today selling business connectivity at ADSL2+, T1, Dual-T1 and Ethernet (5 to 30Mbps). All of these products have the same business SLA as a T1, T3 or fiber product, and the same typical mean time to repair.
They're supported 24x7x365, and we dispatch at all hours if needed. This is unlike AT&T ADSL, which is a best effort service, with just slightly more than 8-5pm business hours service and repair.
When we begin offering residential ADSL2+, it will by necessity be priced in a way which does not support 24 hour repair dispatch - that's just not feasible or reasonable. We do not anticipate demand for residential symmetric Ethernet products, and CPE cost likely precludes it as well. To give an example, the 8 pair CPE which supports the 30Mbps/30Mbps product goes for about $1600 retail. Additionally, most homes do not have eight pairs.
We are excited about two pair ADSL2+ bonding, and we anticipate products on that technology relatively soon. See my blog entry at »corp.sonic.net/blog/2008/02/22/3···s-house/ for some info on a recent test run. The only real hurdle at this point is CPE availability - there are only one or two CPE options for ADSL2+ pair bonding available at this point, and we're not real impressed with them. We'll likely await some additional options.
The other item on the horizon is ADSL2+ Annex M. ADSL2+M shifts the down and upstream split, allowing for 20Mbps/3.5Mbps. In the real world, this is probably products around 15Mbps/2Mbps, or 15Mbps/2.5Mbps. And, you can bond - so that turns into 30Mbps/5Mbps in a typical two pair residential application.
Finally, the specification can bond more than two pairs - while again running into limitations on the amount of available copper to the home and the cost and availability of the CPE. In theory, you could bond up to 32 pair (768Mbps downstream, 32Mbps upstream), but no one makes a CPE that does it. Our Adtran platform does support more than two pair bonding however, so if/when CPE are available (I'd like to see four pair), we are ready.
These technologies mean new life for copper, while providing competitive options alongside FIOS and DOCSIS 3.0, today and into the future.
Sorry for the LONG posting, and thanks for reading. Ongoing updates on our work are available at »corp.sonic.net/blog/
-Dane | |
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