See L-system for information on Lindenmayer systems.
Transcontinental Cable System - L System
System
Year
Frequency
Coax per cable
Distance between repeaters
Capacity
L-1
1941
3 mhz
4
8 miles
600 voice circuits
L-2
1942
840 khz
4
16 miles
360 voice circuits
L-3
1953
8 mhz
8
4 miles
5,580 voice circuits
L-4
1967
17 mhz
20
2 miles
32,400 voice circuits
L-5
1972
57 mhz
22
2 miles
132,000 voice circuits
The Transcontinental Cable System was developed by AT&T to create a hardened telecom network for civil defense related communications during the cold war. There were five phases of development of the system, designated L-1 through L-5.
The system was designed to provide for land line connections between key command and control facilities inside the United States. Starting with L-4 the system was upgraded to withstand a nuclear attack. The system consisted of over 100 "Main Stations" and 1000 individual repeater vaults. The "Main Stations" had generators, blast doors and accommodations for staff for a two-week post-attack period.
In the late 1970s and early 1980s the system was determined to be redundant with the advance of satellite based communications. Most stations were never upgraded past L-4 due to advancement of technology.
One use of the system was for nuclear early warning systems and blast detection.
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