Telephone System Characteristics - SS0330001
Signal Subcourse 333 Telephone System Characteristics
Introduction - SS0330004
Lesson Objectives - SS0330005
Impairments to Telephonic Communication
Disturbing Effect of Noise.
Line Circuit Weighting
Amplitude-Frequency Distortion
Loading and Data Transmission.
Study Exercises-cont. - SS0330011
Study Exercises-cont. - SS0330012
Study Exercises-cont. - SS0330013
Study Exercises-cont. - SS0330014
Lesson 1: Network Losses and Gains
Instrumentation.
Table 1. Power, Voltage, and Current Ratios
Absolute vs Relative Levels
Figure 2-1. Approximate power levels.
Table 2. Voltage Variation
Circuit Description
Figure 2-3. Transmission level diagram.
Figure 2-4. Loss-gain characteristic.
Using the TLP.
Circuit Adjustments
Calculations of Noise Levels.
The Military Transmission Plan
Types of Circuits.
Figure 2-5. Types of circuits in a telephone network.
Figure 2-6. Transmission level diagram of LD trunk.
Study Exercises-cont. - SS0330031
Figure 2-7. Schematic diagram of a line terminating circuit.
Study Exercises-cont. - SS0330033
Figure 2-8. Partial transmission level diagram.
Study Exercises-cont. - SS0330035
Lesson 3: Echo Suppressors and Compandors
Telephone Networks
Figure 3-1. Hybrid coil directs traffic through repeaters.
Echo Suppressor
Echo Suppressor Principles
Compandor
Figure 3-4. Compandor in a telephone communications circuit.
Study Exercises-cont. - SS0330043
Study Exercises-cont. - SS0330044
Study Exercises-cont. - SS0330045
Study Exercises-cont. - SS0330046
Lesson 4: Equalization
Analog Signal Distortions.
Frequency distortion.
Amplitude-Frequency Equalizer
Figure 4-2. Amplitude-frequency equalizer, simplified schematic diagram.
Combination Equalizers
Delay Characteristics-cont.
Block Diagram.
Equalization Procedure
Application of Equalizers
Figure 4-6. Application of equalizers to telephone carrier terminal.
Future Developments
Study Exercises-cont. - SS0330059
Figure 4-7. Delay equalized circuit characteristics.
Study Exercises-cont. - SS0330061
Study Exercises-cont. - SS0330062
Extension Course of the Us Army Signal School
Extension Course of the Us Army Signal School-cont. - SS0330064
Extension Course of the Us Army Signal School-cont. - SS0330065
Extension Course of the Us Army Signal School-cont. - SS0330066
Extension Course of the Us Army Signal School-cont. - SS0330067
Extension Course of the Us Army Signal School-cont. - SS0330068
Extension Course of the Us Army Signal School-cont. - SS0330069
Telephone System Characteristics
Signal Subcourse 333 Telephone System Characteristics
Introduction - SS0330004
Lesson Objectives - SS0330005
Impairments to Telephonic Communication
Disturbing Effect of Noise.
Line Circuit Weighting
Amplitude-Frequency Distortion
Loading and Data Transmission.
Study Exercises-cont. - SS0330011
Study Exercises-cont. - SS0330012
Study Exercises-cont. - SS0330013
Study Exercises-cont. - SS0330014
Lesson 1: Network Losses and Gains
Instrumentation.
Table 1. Power, Voltage, and Current Ratios
Absolute vs Relative Levels
Figure 2-1. Approximate power levels.
Table 2. Voltage Variation
Circuit Description
Figure 2-3. Transmission level diagram.
Figure 2-4. Loss-gain characteristic.
Using the TLP.
Circuit Adjustments
Calculations of Noise Levels.
The Military Transmission Plan
Types of Circuits.
Figure 2-5. Types of circuits in a telephone network.
Figure 2-6. Transmission level diagram of LD trunk.
Study Exercises-cont. - SS0330031
Figure 2-7. Schematic diagram of a line terminating circuit.
Study Exercises-cont. - SS0330033
Figure 2-8. Partial transmission level diagram.
Study Exercises-cont. - SS0330035
Lesson 3: Echo Suppressors and Compandors
Telephone Networks
Figure 3-1. Hybrid coil directs traffic through repeaters.
Echo Suppressor
Echo Suppressor Principles
Compandor
Figure 3-4. Compandor in a telephone communications circuit.
Study Exercises-cont. - SS0330043
Study Exercises-cont. - SS0330044
Study Exercises-cont. - SS0330045
Study Exercises-cont. - SS0330046
Lesson 4: Equalization
Analog Signal Distortions.
Frequency distortion.
Amplitude-Frequency Equalizer
Figure 4-2. Amplitude-frequency equalizer, simplified schematic diagram.
Combination Equalizers
Delay Characteristics-cont.
Block Diagram.
Equalization Procedure
Application of Equalizers
Figure 4-6. Application of equalizers to telephone carrier terminal.
Future Developments
Study Exercises-cont. - SS0330059
Figure 4-7. Delay equalized circuit characteristics.
Study Exercises-cont. - SS0330061
Study Exercises-cont. - SS0330062
Extension Course of the Us Army Signal School
Extension Course of the Us Army Signal School-cont. - SS0330064
Extension Course of the Us Army Signal School-cont. - SS0330065
Extension Course of the Us Army Signal School-cont. - SS0330066
Extension Course of the Us Army Signal School-cont. - SS0330067
Extension Course of the Us Army Signal School-cont. - SS0330068
Extension Course of the Us Army Signal School-cont. - SS0330069
Telephone System Characteristics
