CTW

 AMC visit  of Statcon and UFSBI  - 07 March 26

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21.Telecom

                                                    Basics of Telecom Mobile Communication   Emergency Communication  Emergency Communication is provided by following means a) Emergency Socket b) 5/25 Watt VHF sets c) GSM - R ( very less percentile) d) Mobile phones available with driver, guard and staff. Emergency Socket- PT Set telephone is provided in Emergency Socket. Disadvantage of above mode of Emergency Communication - Section controller is not able to contact train crew in moving train It can be initiated only in static condition SOS facility is not available Weight of emergency control phone is fairly heavy. GSM - R is used at very less percentile. To avoid these Shortcoming MTRC ( Mobile train radio communication) is implemented. Accidents, unusual situation, robbery in train, Locomotive failure and chain pulling etc. Features of MT...
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11.Data Communication & Networking

  Data Components - A data communication system has five components. 1.  Receiver  2. Sender 3. Message  4. Transmission media- Path by which message travels. Ex Twisted pair wires, Coaxial cable,fibre optic cable and radio waves 5. Protocol  Protocol is set of rules used by computers to communicate with each other across network.  Protocols can be classified as Proprietary Protocol ( specific make) Open source Protocol ( Any make). Bandwidth -  It is defined as amount of data that can be transmitted into a fixed amount of time. Usually expressed in bps ( bits per   second) Fundamental Characteristics of Data Communication   1. Delivery- System must deliver data to correct destination  2. Accuracy- System must deliver data accurately  3. Timeliness- System must deliver data in a timely manner  4. Jitter- Jitter refers to variation in packet arrival time. It is uneven delay in the delivery of audio and video packets,which r...
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7.Telecom manual

  PTCC - Power and Telecommunication Co-ordination Committe. Central standing committee for co-ordination of Power and Telecommunication system. Local Telephone Equipment ( LTE). LTE is used to provide 20 local telephones at HQ. Types of cables  A) Quad Cable 0.9 mm or 1.4 mm dia. 1.4 dia Quad used for Block Section more than 12 kms. Suitable for underground laying. Used for control Circuits and block interfaces. IRS Specifications IRS: TC 30/05 B) PIJF cable-  Multi pair ( from 10 pairs to 200) Multi dia ( 0.5 mm/0.63 mm/0.9 mm) Suitable for underground laying. Used for exchange subscriber lines or branch cables branching off from main quad cable. C) Twisted Pair Switch Board Cable ( 0.5 mm/0.6 mm) Not designed for underground laying. Used for indoor applications such as distribution to various telephone subscribers in a building. Jointing Kit- For quad cable jointing- RTSF ( Reinforced Thermo Shrink Jelly Filled kit) type jointing kit to be used. Laying - Quad cable ...
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