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Hands-On Design Process

Hands-On Design Process. for PS-VoIP Networks. ALs. /TKs. 1. Model only T-1 lines for. /. since T-1 lines can handle both voice &. Data Multi-Media Intranet traffic in a PS IVDNet. (i.e. ALT=TKLT =3 in SDF and Wm=1440000 bps in NLT). 2. Model 1, 2, & 3 Optimally-Located. SWs.

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Hands-On Design Process

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  1. Hands-On Design Process for PS-VoIP Networks ALs /TKs 1. Model only T-1 lines for / since T-1 lines can handle both voice & Data Multi-Media Intranet traffic in a PS IVDNet. (i.e. ALT=TKLT =3 in SDF and Wm=1440000 bps in NLT) 2. Model 1, 2, & 3 Optimally-Located SWs for only the Star Topologies.

  2. The Existing Technology for PS-VoIP Networks 1. Several vendors use ITU voice digitization and packetization schemes and asynchronous multiplexing techniques for sharing T-1/T-3 digital transmission lines voice and data. 2. One vendor employs an encoding scheme to fill-up the entire 56-Kbps line with 8 voice conversations. Another vendor fills up the same line with 12 voice conversations. The number of conversations on a T-1 line can be computed accordingly for each vendor. One can now employ ITU voice-digitization schemes with comparable bandwidth efficiencies.

  3. The Existing Technology for PS-VoIP Networks (Contd.) 3. The voice-encoding and packetization are implemented in a box called the Gateway that interface with existing PABXs or telephones. The price for a medium-sized box is about $10,000. The impact on the monthly costs attributed to additional hardware is minimal (cf. reasonsfor the CS IV/D network as given in CSS11).

  4. IV/D NETWORKS: The Design Process • Prepare aVHD file using the CPE data • Prepare a NLT file for useful link types • Select the valid tariffs in a TARIFF file • Prepare a valid LINK file if required • Use “Find COGs ”capability for choosing Nsw SW locations for preparing a valid SWF ( Fix NDEC & DECT in SDF for COGs ) • Adjust the required SDF parameters

  5. SDF - The Data-Related Design Parameters • ATP ( Tr analysis type), Wm , ALT, TKLT • UPR,HPR,HTT, R , T , T , K mph np hm pg • IML, RML, BLKL, ICPB ( IBytes . /block) • N (no. of nodes allowed/ VMPT; valid for cu only Doelz networks), MTKU • F =0 or 1 (for use of Sharma’s exchange opt algorithm for additional optimization)

  6. Updating Design Parameters Follow the same steps in updating the design parametrs of SDF and NLT as described for Data Networks. We must now create a VHD17b that reflects total bps handled in an enterprise intranet employing IP protocol. This is shown in the next slide.

  7. Creating a VHD17b Input File 1. Take the pure data traffic intensity (TI) of VHD17 file and multiply it by a factor of 200 to reflect Multimedia Intranet IP Traffic Intensity in bps. (Use File Menu Item VHDTMultiplier and name the new resulting VHD file as VHD17b)

  8. VoIP Network Design Process 1. Open/View the input file “Files” and enter VHD17b, LINK17, , MAPUSA TARIFF, SDF, NAME17, LATA17 and SWF in the proper cells and UPDATE. 2. Open/View the input file “SDF” and update values of ALT=3, TKLT=3, for Leased T-1 lines, ATP=4 for IP Protocol, bps and BBTF=2. UPR/HPR= 56-K

  9. 3. Also use BLKL=2000 bytes ICPB=1850 bytes, Tnp=1 ms, Thm=1 ms for IP and Fpg= .01, Flk=0, Flt=1, Fftd=0, Fnn=1, 4. Use SWF with 1 SW at 1, 2 SWs at 1 and 11, 3 SWs at 1, 11 and 2 to create three DataNets with MD topology . 5. Repeat Steps#4 to model DataNets based on Star topology. 6. Tabulate results with REMARKS.

  10. 6. Choose the optimum network topology based on cost criteria only. 7. By using VHD17c (with Intranet IP data traffic plus Legacy voice traffic in bps or Col. 3 of IVD Feasibility Table), repeat Steps#4, 5 to show that monthly costs remain the same (or Voice is free). 8. Include the Tabulations and remarks in the MSWord document.

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