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stephencooke
stephencooke
12/5/2012 | 3:12:17 PM
re: AT&T Sets Copper Ethernet Course
Hi Seven,

I never said that I would be using G.Bond on a single pair. Each house, serviced by the pedestal, has 2 pairs from the pedestal at a minimum; rings does not apply in neighbourhoods where there is physically only a single pair/house from the pedestal. If a single binder group is routed to the pedestal or if other binder groups at the pedestal are physically routed to different DSLAMs then my max bandwidth to that pedestal, and therefore around the ring, is 50Mb/s symmetric. I'm OK with that. As a consumer, access to 50Mb/s is much better than 2Mb/s, even if that 2Mb/s is dedicated.

Sharing the bandwidth is NOT the same as "3M/s to each home on average", especially given the QoS and multicast capabilities. P2P traffic is lower priority therefore it waits until there is bandwidth available that is not being used by higher priority traffic.

In terms of DSL bandwidth being limited by distance is the whole reason for doing this. Long haul optics need OpAmps and/or repeaters. Optical rings can be many times longer than individual span limits because they terminate & regenerate. Same principle here, it's do-able just tougher.

The high rates are on the individual links between houses, which ARE very short. In this case only 2 pairs are used for each house, one facing each neighbour (or the network gateway node on the ends). The link from the gateway node to the CO logically combines the pairs of all the subscribers on the ring (eg: if there are 8 subscribers then potentially 16 pairs can be combined towards the CO). This link is governed by the physics of DSL on each pair, the total available bandwidth is just multiplied by the number of pairs used.

If a telco, such as AT&T, can provide 50Mb/s (an increase of 25X over their current xDSL offering while simultaneously providing efficient multicast & QoS) without spending $??Billion to trench fiber, perhaps they can offer LightSpeed services to far more homes then their existing plans.

Incidentally, on links less than 1km (3.3kft) it is possible to get 400Mb/s with 4 people on the ring (or 1.5km - 5kft - with 8 people and over 2km - 6.5kft - with 12 people) so my statement holds in much of the US and almost everywhere in Europe depending on the number of people on the ring.

Thanks again,

Steve.
stephencooke
stephencooke
12/5/2012 | 3:12:12 PM
re: AT&T Sets Copper Ethernet Course
Seven,

I must apologize for not being clear. Perhaps a better description might be the following:

Where the distance can be made to be short (ie: between houses hanging off a pedestal) use DSL-based rings. VDSL2 gives sufficient bandwidth to make this approach interesting. There are other advantages, some of which I have mentioned in the earlier posts.

Where the distance is relatively long for DSL, use larger numbers of pairs with G.Bond to achieve sufficient bandwidth. Many DSLAMs already support bonding. I believe that T-Com was looking into offering a business service based on bonding.

Significant bandwidth, using existing Unshielded Twisted Pair (UTP). Seems to fit most of the points on one of my previous posts...
(http://www.lightreading.com/bo...

Thanks again,

Steve.
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