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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: MikeM54321 who wrote (8722)10/2/2000 10:14:57 AM
From: Frank A. Coluccio  Read Replies (1) of 12823
 
>>Assumme copper exhaust is a problem -- Then the literal doubling of T1 capacity can be gained by HDSL2. Seems to me it's quite compelling for a telco to roll it out.<<

These likelihoods were built into the North American Digital Hierarchy standards during the 1960s. Initially (and these are still used in some areas) the solution was to introduce the T1C (at 3.15 Mb/s, thus doubling the speed of the T1) and the T2 (at 6.3 Mb/s, effectively four times the speed of the T1 + buffering bits and other management overhead).

These new line rates introduced repeater spacing requirements that were more stringent than those that were used for T1, which was and still is ~5,000 feet, to coincide with loading coil (pot) points on interoffice cable spans.

T1C and T2 are now pretty much relegated to Mux stages in Central Office equipment, although the T2 is still used extensively to bundle four T1s in SLC 96 systems (Subscriber Line Carrier) and microwave systems. The 96 results from 4 * 24 channels per T1, = 96 per "system."

T1C and T2 rates also align with MPEG compression rates. Or, maybe I should say that the MPEGs aligned themselves to the Line Rates. In any event, they are the speeds of choice due to the abundance of mux stages in SONET and other TDM devices that use them. They fit like the proverbial glove.
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