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3.1.1 Fixed Telephone Lines
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3. Telecom Connectivity Infrastructure
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3. Telecom Connectivity Infrastructure
3.1 Internal Telecom Connectivity
3.1.1 Fixed Telephone Lines
3.1.1.1 Installed Main Lines
3.1.1.2 Main Lines in Operation
3.1.1.3 Digital Main Lines
3.1.2 Local Exchanges
3.1.3 Long-Distance Exchanges
3.1.4 International Exchanges
3.1.5 Channel Types and Usage
3.1.5.1 Microwave Channels
3.1.5.2 Optical Fiber Channels
3.1.5.3 Satellite Channels
3.1.6 Geographic Coverage
3.1.6.1 Rural Communications
3.1.6.2 Urban Communications
3.1.7 Area Codes
Payman Arabshahi
2001-04-27
