ePanorama telecom documents
Telephone line audio interface circuitsThis document describes how telephone works and how you cain interface to telephone line. This document describes also telephone line technical details.ADSL filters explainedThis document describes how ADSL filters work and why they are needed.Telephone ringing circuitsThis document describes telephoen line ring signal details, and gives circuit ideas how to generate and detect telephone rign signals.Caller ID circuitsInformation about caller identification circuitsBellcore Caller ID specificationBellcore Caller ID specificationCaller ID system used in FinlandInformation about coilsFax to Modem interfaceFax to Modem interfaceGyrator circuit: simulate large coils electronicallySometimes coils with large inductance is needed in telecommunication systems and filters. Coils with inductance of many henries are not usually very useful in modern small electronics circuits. To overcome there is one solution which can be used in many applications: simulate the behauvior of coils using electronics.Use old phones as an intercomVery simple intercom circuitHow to record telephone conversationsHow to record telephone conversationsTelephone line surge protectionTelephone line surge protectionTelephone wiring in UKTelephone wiring in UKu-LAW and A-LAW definitionsu-LAW and A-LAW definitionsGenerating DTMF tones using soundcardWhat are DTMF tones and how to generate then using software algoriths. |