1 / 16

Sistem Telepon Pertemuan 11

Matakuliah : H0122 / Dasar Telekomunikasi Tahun : 2008. Sistem Telepon Pertemuan 11. Learning Outcomes. Mahasiswa dapat menunjukkan konsep telepon, bagaimana koneksinya serta masalah yang ada pada sistem telepon. Outline Materi. Terminology Central Office Switching. Telephone System.

naiara
Télécharger la présentation

Sistem Telepon Pertemuan 11

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Matakuliah : H0122 / Dasar Telekomunikasi Tahun : 2008 Sistem TeleponPertemuan 11

  2. Learning Outcomes Mahasiswa dapat menunjukkan konsep telepon, bagaimana koneksinya serta masalah yang ada pada sistem telepon.

  3. Outline Materi • Terminology • Central Office • Switching

  4. Telephone System • Terminology • Local loop • Central office • Exchange • Trunk • Nodes • Super trunks • Tandem switch • Hierarchy

  5. Toll Office Switching Office End Office Local Loop Trunk Intertoll Trunk Components • Three major components: • Local loops: twisted pair, analog signaling • Trunks: fiber optics or microwave, mostly digital • Switching offices

  6. Hierarchy

  7. Terminal/Local Loop • Telephone Terminal • Local loop and Basic Phone • Calling sequence in phone • Talking signals • Analog voltage • Outgoing : 1 – 2 V at approx. 3 mA • Incoming : half of outgoing signals • Local loop characteristics • Envelope delay • Voice grade: • Dial-up or switched line • Dedicated, conditioned or leased line

  8. Terminal/Local Loop • Loop signal level • Outgoing : - 10 and 0 dBm (600 ) • Incoming : - 42 to – 4 dBm • Termination on the Central office : 600 (or 900) • Dialing • Pulse • Tone • Dual-tone multi-frequency (DTMF)

  9. Terminal/Local Loop DTMF tones for each number

  10. Loop Supervision • BORSHT is the function of Subscriber loop interface circuit (SLIC) or line card in interfacing to a local loop • Battery : - 48 V dc • Over voltage : protection from excessive voltage • Ring trip : send 90 V 20 Hz ac signal with on hook : 2 s ; off hook : 4 s • Supervision : monitor the phone loop • Hybrid: • Two-wire to four-wire converter or four wire terminating set: plit the local loop into 2 wire pairs. • Trans-hybrid loss: – 30 to 50 dB of rejection • Test • To test signals on the line and to check quality of loop and phone performance

  11. Central Office • Process calling : • Recognize the dialed digits • Make physical connection • Connection : • Allow an analog signal voltage • Switching systems in matrix (crossbar or cross point switch) • For greater reliability used reed relay

  12. Common Channel Signaling

  13. Echo Cancellation • Echo parameters: • Signal travel time and travel distance • Echo time = (distance/prop.velocity) x 2 • To Cancel • Insert the reverse path loss • Echo suppression by insertion of reverse path loss • Signal subtractions • Echo suppression using the signal subtraction method • Digital signal processing • New version of subtraction method, need arithmetic calculation (algorithm) • Four-wire method

  14. Echo Cancellation

  15. Four Wire

  16. Summary • Telah dipelajari gambaran umum sistem telepon. • Telah dipelajari komponen telepon.

More Related