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history:bellsystem:start [2021/12/01 02:13]
jesse
history:bellsystem:start [2021/12/01 02:14] (current)
jesse
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 L-carriers were a set of coaxial-cable based analogue carriers widely used for early long-distance lines. L-carriers were a set of coaxial-cable based analogue carriers widely used for early long-distance lines.
  
- * [[history:bellsystem:lcarrier|Field guide to L-carrier]]+  * [[history:bellsystem:lcarrier|Field guide to L-carrier]]
  
 L-3I, or L-3 Improved, was a version of the L-carrier widely used in the AT&T network to multiplex calls onto coaxial cables. L-carrier was used prior to the introduction of fiber optics for this purpose, and a relatively small number of L routes were built across the country, many of them still easy to pick out today because of the frequent repeaters with above-ground structures and unusually wide trenching scars. What was //improved// about L-3I specifically was its durability: L-3I was used to carry AUTOVON traffic, and so L-3I infrastructure was hardened against attack, including nuclear attack. L-3I, or L-3 Improved, was a version of the L-carrier widely used in the AT&T network to multiplex calls onto coaxial cables. L-carrier was used prior to the introduction of fiber optics for this purpose, and a relatively small number of L routes were built across the country, many of them still easy to pick out today because of the frequent repeaters with above-ground structures and unusually wide trenching scars. What was //improved// about L-3I specifically was its durability: L-3I was used to carry AUTOVON traffic, and so L-3I infrastructure was hardened against attack, including nuclear attack.
  • history/bellsystem/start.txt
  • Last modified: 2021/12/01 02:14
  • by jesse