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I
Transmission Lines: Types of transmission lines. General transmission
line equation, line constant. Equivalent circuits, infinite line.
Reflection on a line. SWR of line with different type of terminations.
Distortionless and dissipationless lines, coaxial cables, transmission
lines at audio and radio frequencies, Losses in transmission line,
Transmission equalizers. Characteristics of quarterwave, half wave and
other lengths. Smith chart and its application. Transmission line
applications. Stub matching. Measurement of parameters of transmission
line, measurement of attenuation, insertion loss, reflection coefficient
and standing wave ratio.
II Attenuators & Filters: Elements of telephone transmission
networks, symmetrical and Asymmetrical two port networks. Different
Attenuators, pi-section, T-section filter, m-derived filter sections,
Lattices filter section.
III Carrier Telephony: Multi-channel systems; Frequency division
and time division multiplexing, power time carrier communication.
IV Telephone Transmission: Telephone Instrument; Rotary dial and
Touch tone dial types, two wire/four wire transmission: Echo & singing,
Echo suppressors and cancellers. cross talk.
V Basic Of Automatic Telephony: Trunking concepts. Grade of
service, Traffic definition, Introduction to switching networks,
classification of switching systems. Electronic Exchange, EPABX and SPC
Exchange, principle of STD, ISD. Recent Trends in Telecommunication: Voice
frequency telegraphy, Fascimile and telex services.
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