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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Stephen B. Temple who wrote (2535)12/10/1998 7:45:00 PM
From: ftth  Read Replies (2) of 12823
 
Hi Stephen, regarding question #1, I guess you could even call those numbers typical since the target downstream speeds and distances that vendors are supposed to strive for, per the ADSL Fourm, are 6.312 Mbps @12,000 feet with 24 AWG, and 1.544 Mbps @18,000 feet with 24 AWG.

#2, right, the loading coils are added for long loop runs to counter the capacitance of the wire pair (twisting can only add so much inductance). Whether there are real cases where loading coils are in shorter runs, I don't know (but there shouldn't be). There are standards for the 3 types and spacings of loading coils. If for some reason there are loading coils within the 18,000 foot boundary, they would just have to be removed. That should have no ill effects since the system model doesn't allow them anyway. But, as many as 20% of the loops extend beyond 18,000 feet--those are the problem loops. Don't know if the industry has an agreed upon solution for these cases.

dh
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