iansltx
join:2007-02-19
Golden, CO
kudos:2 | reply to patcat88
Re: Also launched in Austin and San Antonio 100+ MHz of spectrum to play with, that's how. |
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patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | said by iansltx:100+ MHz of spectrum to play with, that's how. Irrelevant.
If you have 1 tower serving 200000 subscribers, 100mhz is nothing.
If you have low SNR, 100 mhz means nothing.
If your not using all 100mhz by corporate financial decision, 100 mhz means nothing.
If your backhaul is less than what 100 mhz and the SNR and protocol make available, 100 mhz means nothing.
If there are legacy users in your 100 mhz, 100 mhz means nothing. |
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iansltx
join:2007-02-19
Golden, CO
kudos:2 Reviews:
 ·Comcast
| 1. WiMAX is built for metro-area networks. There aren't going to be 200,000 subscribers on a tower, just like there aren't 200,000 subscribers on a cable node.
2. Cable has low SNR issues as well. There's also the issue of no-SNR areas...you know, the ones that aren't wired for cable.
3. If you aren't using DOCSIS 3.0 by corporate decision, 160 Mbps means nothing.
4. Clear has fiber backhauls to its main towers, and wireless bckhauls in between towers. Once you get fiber brought in the marginal cost of bandwidth is relatively low. On the wireless side, point to point wireless backhauls are available at the gigabit-per-second level.
5. There are no legacy users in the 100MHz of spectrum that Clear has.
With 100MHz of spectrum, Clear potentially has more capacity in a given area than 8-channel-bonded DOCSIS 3.0, though realistically due to lower than average signals etc. you'll see packages more comparable to DOCSIS 1.1 or maybe 2.0, at least with today's equipment. Which is perfectly fine; DOCSIS 1.1 and 2.0 are more than enough to compete on mobility and price versus DSL, non-D3 cable and even DOCSIS 3. |
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patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | said by iansltx:With 100MHz of spectrum, Clear potentially has more capacity in a given area than 8-channel-bonded DOCSIS 3.0, though realistically due to lower than average signals etc. you'll see packages more comparable to DOCSIS 1.1 or maybe 2.0, at least with today's equipment. Which is perfectly fine; DOCSIS 1.1 and 2.0 are more than enough to compete on mobility and price versus DSL, non-D3 cable and even DOCSIS 3. How about some actual mbps? And does Clear use 100 mhz at each tower? and how much performance loss is there from frequencey reuse in wimax? |
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iansltx
join:2007-02-19
Golden, CO
kudos:2 Reviews:
·Comcast
| WiMAX is 4.5 bits per Hz at maximum modulation. Probably around 3.5 bits per Hz normally. So on a 5 MHz channel you've got 5 x 3.5 = 17.5 Mbps of capacity on the downstream. 10 MHz channels may also be deployed.
Each tower probably won't use all 100+ MHz that Clear has, but could use 60+ MHz if sectorized with no performance degradation due to spectrum reuse. Which, thanks to the propagation patterns of 2500MHz, is high. |
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| Is that spectrum (100MHz that they have to use) per tower, per town, or for the whole US?
So if they use 5MHz for a tower, can they not reuse that for other towers/towns? |
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iansltx
join:2007-02-19
Golden, CO
kudos:2 Reviews:
·Comcast
| Just like any other cellular provider (which they are, sorta) they can reuse their spectrum as long as they don't interfere too much with themselves...and they have a LOT of spectrum. I may be wrong on the actual numbers, but I think they have something like the whole 2500-2600MHz band or something similarly crazy. |
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