OLT (Norwegian forOffentlig Landmobil Telefoni, Public Land Mobile Telephony), was the first land mobile telephone network in Norway. It was established December 1, 1966, and continued until it was obsoleted byNMT in 1990. In 1981, there were 30,000 mobile subscribers, which at the time made this network the largest in the world.
The network operated in the 160 MHzVHF band, usingfrequency modulation (FM) on 160-162 MHz for the mobile unit, and 168-170 MHz for the base station. Most mobile sets were semi-duplex, but some of the more expensive units werefull duplex. Each subscriber was assigned a five digit phone number.
In 1976, the OLT system was extended to includeUHF bands, incorporatingMTD, and allowing international roaming withinScandinavian countries.
Cellular network standards | |||||||||
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| 0Gradio telephones (1946) | |||||||||
| 1G (1979) |
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| 2G (1991) |
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| 2G transitional (2.5G, 2.75G, 2.9G) |
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| 3G (1998) IMT-2000 (2001) |
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| 3G transitional (3.5G, 3.75G, 3.9G) |
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| 4G (2009) IMT Advanced (2013) |
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| 5G (2018) IMT-2020 (2021) |
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