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Communication Networks – II Lecture 12 Advanced Computer Networks (ACN) 545

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Mr. Thilak d e Silva. BSc . Eng., MSc , CEng , FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA). Communication Networks – II Lecture 12 Advanced Computer Networks (ACN) 545 . Today's Agenda. Networks Transmission Networks LTE Multiplexes. Session Outcomes.

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  1. Mr. Thilakde Silva. BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA) Communication Networks – II Lecture 12Advanced Computer Networks (ACN) 545 M.Sc. in IT - Year 1 Semester II - 2012

  2. Today's Agenda • Networks • Transmission Networks • LTE • Multiplexes M.Sc. in IT - Year 1 Semester II - 2012

  3. Session Outcomes • At the end of this session you will understand about the Networks, LTEs, Multiplexes and their management systems. M.Sc. in IT - Year 1 Semester II - 2012

  4. Mobile Networks • Networks can be divided in to three main types. • Access Networks. • Wired • Wireless • Switch Networks. • Transmission Networks. M.Sc. in IT - Year 1 Semester II - 2012

  5. Transmission Networks • There are two main factors in Transmission networks. • Transmission Media • Transmission Technology. M.Sc. in IT - Year 1 Semester II - 2012

  6. Transmission Networks - LTE • One type of transmission media is Fiber. • Fiber should be terminated from a special equipment named LTE – Line Terminal equipment. LTE LTE Fiber M.Sc. in IT - Year 1 Semester II - 2012

  7. Responsibilities of LTEs, • Including supervisory signals to supervise the end to end line. • Eg:- if a repeater is faulty it should be identified. Repeater Repeater LTE LTE Fiber Line M.Sc. in IT - Year 1 Semester II - 2012

  8. Responsibilities of LTEs, • Suitable encoding of bit patterns. • Eg:- Manchester Encoding AMI CMI • Media Conversion (if necessary) • Eg:-Electrical to Optical Conversion M.Sc. in IT - Year 1 Semester II - 2012

  9. LTEs – The network LET LET LET LET LET LET LET M.Sc. in IT - Year 1 Semester II - 2012

  10. LTE • All transmission networks terminates at LTE. • Need supervisory signals to monitor the link. • If one link is out of order or if a particular link is having high traffic the LTE finds an alternate link to send data. • This is the management part of the media. M.Sc. in IT - Year 1 Semester II - 2012

  11. LTE – Transmission Media Management System • Graphically represents all the LTEs and respective links between LETs. • Transmission media management can be done in a separate, central location. • This is for fiber optics. • Most of these software are pro-priority. M.Sc. in IT - Year 1 Semester II - 2012

  12. Multiplexes – The network MUX MUX MUX MUX MUX MUX MUX M.Sc. in IT - Year 1 Semester II - 2012

  13. Multiplexes • Telephone lines are connected to MUX. • Multiplexes are connected directly to LETs. • Logically Muxses forms a separate network but actually data are sent through the LETs. M.Sc. in IT - Year 1 Semester II - 2012

  14. Multiplexes • Eg:- SDH (ITU-T standard) • SDH includes a management system too. • Theses Multiplexes also has a separate management system, to divert the traffic in a failure of a link, to an alternate link. M.Sc. in IT - Year 1 Semester II - 2012

  15. LTE Restoration Vs Multiplexes Restoration • From these two fiber restoration is done immediately. (LTE Restoration) • Only if the fiber is slow, SDH will do the restoration. (Multiplexes Restoration.) • But Fiber management software is expensive and not used in countries like Sri Lanka. M.Sc. in IT - Year 1 Semester II - 2012

  16. Switches • Similar concept is used in switches. • Physical Layer, SDH layer and switches has separate management systems. M.Sc. in IT - Year 1 Semester II - 2012

  17. Thank You… M.Sc. in IT - Year 1 Semester II - 2012