Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : America On-Line (AOL) -- Ignore unavailable to you. Want to Upgrade?

To: Craig A who wrote (19367)	5/31/1999 8:20:00 PM
From: Pruguy	Read Replies (1) \| Respond to of 41369

central office is where the hardware is stored and where each unique line ends...the max. distance to the end user from the CO is 17500 ft...some people think this is to far, but that is the distance the companies generally will sell to

To: Craig A who wrote (19367)	5/31/1999 10:03:00 PM
From: Brian Malloy	Read Replies (2) \| Respond to of 41369

This is a good site to get information. Be sure to read the white paper. dslnetworks.com Extracts from the site below. In order for DSL to work, there are several factors that must be in place: First, a regional telephone company or local exchange carrier (LEC) must install a specialized router called a DSLAM at a telephone company central office (CO). This device translates and transmits DSL signals from the copper phone line onto a larger backbone network and vice-versa. In order for DSL to work the CO must be within about 18,000 feet of the end-user. This distance is the practical limit over which large amounts of data can travel through copper wire before the signal degrades. The ability to offer DSL in various regions is almost entirely dependent upon these industrial routers being installed. The time and costs involved installing this equipment has made DSL availability even in large metro areas a gradual one. By mid 1999, it is expected that the top 20 metro markets will have DSL available, and many more markets are expected to follow. To find out if DSL is available in your area, please visit the avaialbility section of this Website. Downstream data rates depend on a number of factors, including the length of the copper line, its wire gauge, presence of bridged taps, and cross-coupled interference. Line attenuation increases with line length and frequency, and decreases as wire diameter increases. Ignoring bridged taps, DSL will perform as follows: Data Rate.........Wire Gauge......Distance........Wire Size...Distance 1.5 or 2 Mbps...24 AWG..........18,000 ft.......0.5 mm......5.5 km 1.5 or 2 Mbps...26 AWG..........15,000 ft.......0.4 mm......4.6 km 6.1 Mbps..........24 AWG..........12,000 ft.......0.5 mm......3.7 km 6.1 Mbps..........26 AWG............9,000 ft........0.4 mm......2.7 km While the measure varies from telco to telco, these capabilities can cover up to 95% of a loop plant depending on the desired data rate. Customers beyond these distances can be reached with fiber-based digital loop carrier systems. As these DLC systems become commercially available, telephone companies can offer virtually ubiquitous access in a relatively short time. A site that shows the "relative" speed difference between DSL and modem. bell-atl.com Overall, IMHO the RBOC's with the assistance of companies like COVAD, Rhythms, Northpoint and others can build out the DSL networks quicker than the cable boys can build theirs out. Especially, since the cable boys plan to do it by themselves and don't want to share. Regards,