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  • 1. PRIVATE VOICE - DATA TELECOM NETWORK “A BUSINESS TOOL YOU CANNOT AFFORD TO BE WITHOUT”• 100% secure, fixed operating cost, • Cuts present telecom costs private network. by up to 75%.• No usage charge. • Unlimited inter-locational communications - speech, fax, data.• Set-up cost pay back in 1 to 2 years • High network up-times.• Ideal communications backbone for ERP DELHI KOLKATA • Voice and voice-data conferencing. MUMBAI • Integrates voice, fax, data over analogue and digital leased lines. • Connects any place in the world. • Group III fax - no time lost in document scanning. • Set-up cost - 50 to 60% of conventional CHENNAI • Normal telephone type digital leased line solutions; 25% of PAMA speech - no delay or VSAT solution. distortions. • Annual operating cost - 75 to 80% of • Eliminates STD calls between conventional digital leased line solution; Company locations. 20 to 25% of PAMA VSAT solution. • Converts MLOs to VSOs • Break-even duration - 25 minutes of additive communications from both sides of a link, for all types of communications taken together, speech, fax, data. • Patent 176287 of 27.12.1991 •Patent 202674 of 23.10.1998 & New Patent Pending 6/1A, KARTIK BOSE LANE, KOLKATA - 700006. Phone: 91332543-3684; FAX: 91332543-3684 Mobile phone : +919432228808 / +919831210647 e-mail : midautel@bsnl.in
  • 2. Fig 1 PVDTN NODE ARCHITECTURE LINE SPLITTER – KM2100 Trunk line cards KDI Digital n x 64 KBPS Leased Lines Voice / fax cards KVF.8 From Delhi Data cards KHS.2 / KLS.1 From Nagpur From Mumbai From Chennai Analogue Leased LinesFrom locations in same city or outstation location Tel V D P S Fax LCE 2W E&M IP Router Circuit switch router Modem Server Residential Connection LAN BUS LAN Nodes NOTE: In Kolkata there are no 4WE&M analogue lines terminating on the VDPS trunk cards. However, these have been shown so that the analogue connection at Mumbai from Ahmedabad and at Delhi from the CG Cell may be understood. 2WE&M lines shown will be present in all locations for residential connections.
  • 3. Fig 2 TYPICAL STATE WAN CONFIG USING MULTI-TIER PVDTN FOR INTEGRATED VOICE, FAX, DATA COMMUNICATIONS UP TO GRAM PANCHAYAT WITH 100% ALTERNATE ROUTING / REDUNDANCY 6.22 KBPS 62.42 KBPS 2 2 2 1 1 1 1 2 X 128 KBPS 2 1 320.7 KBPS 2 1 3 3 1 3 3 3 3 2 X 2WE&M 1 1 6 6 6 384 KBPS 6 4 4 3 6 4 4 3 4 768 KBPS 8 4 3 8 4 8 8 4 4 8 2 MBPS 4 1958.6 KBPS 8 4 MBPS 4 8 4 8 KOLKATA 8 4 8 4 8 4 8 4 8 4 8 8 8 8 4 8 4 MBPS 4 2 MBPS 4 4 4 4 4 4 4 4NOTE : Total number of trunks emanating from Kolkata is 144 (8 x 18). Using the Erlang loadingnorm this can serve 1152 extensions in Kolkata. Thus 1158 officers may be provided NETtelephones and they may be spread across Writers’ Building, New Secretariat, and the Secretariatsat Salt Lake
  • 4. Fig 3 CII – PVDTN Single Tier Network WIDE AREA NETWORK TOPOLOGY Chandigarh 3 512 KBPS IHC 140.64 4 KBPS 9 4 192 KBPS 120.96 KBPS 6 Delhi 320 KBPS 7 227.2 Gurgaon 6 9 KBPS 300.40 KBPS 6 5 103.76 256 KBPS118.48 KBPSKBPS 6 128 KBPS 3 2 Kolkata 3 3 110.64Mumbai KBPS 3 Hyderabad 6 3 120.96 Bangalore 3 KBPS
  • 5. Fig 4 TRI- TRI-NODE FORMATION IN PVDTN USED FOR SINGLE AND MULTI-TIER NETWORKS MULTI- X MAX (X,Y) Y A B X+Y X+Y C1. X and Y are the total bandwidth impinged on the WAN at each location at A and B respectively. This includes bandwidth for data, speech, and fax communications.2. The derivation of X and Y at each location is shown in Table I of our draft proposal presentation.3. The link bandwidth calculations are shown in Table II of draft proposal presentation. As shown above the main links AC and BC will have a total bandwidth of X + Y. This is to take care of 100% alternate routing in case of failure of either AC or BC links.4. The cross link AB will have the larger of the two bandwidths X,Y.5. We hope this will help you to understand the basis of derivation of location and link bandwidths shown in our draft proposal presentation.
  • 6. Fig 5 Schematic Diagram of STS Storage INTERNET PS STS IS INTRANET CS•PS, IS, CS have same fields which are synchronised at eachconnection.•CS collates data from internal data bases to pass on to PSthrough IS, and also distributes information received from theinteractive Web pages in the PS to the relevant data base.•The information stored in the Storage associated with the PShelps to carry out e-commerce activity like placing orders, internetbanking. Etc. The storage is updated in each STS cycle.
  • 7. Fig 6 Switching arrangement of STS Public Server Company For Company information, Company information Inter-active Web pages data bases and and mail server Internet mail GatewayDB1 DB2 CS PS Company LAN 0 Internet LAN 1 2 3-Pos Electro-mechanical RJ45 switch Intermediate Server For transferring information and mail back and forth Between CS and PS (IS) Switch changes state on CL IL Automated settable commands I/O I/O from software in IS Box Box 0 1 2 3-Pos EM RJ45 Switch State changes With manual command From Node Nodes for Internet browsing
  • 8. Fig 7 – Overall datagram CS IS PSCompany InfoWeb Info CompanyExternal mail Fig 8 Step 1 – IS connected to CS CS IS PS Changes inCompany Info Company Info received Changes inWeb Info Web Info received Incoming Outgoing Company Mail MailExternal mail received received Fig9 Step 2 – IS in Null after connecting to CS CS IS PS Changes inCompany Info Company Info receivedWeb Info Outgoing Company MailExternal mail received All content In IS cleansed For viruses etc
  • 9. Fig 10 Step 3 – IS connected to PS CS IS PS Changes inCompany Info Company Info received Changes inWeb Info Web Info received Incoming Outgoing Company Mail MailExternal mail received received Fig 11 Step 4 – IS in Null after connecting to PS CS IS PSCompany Info Changes inWeb Info Web Info received Incoming Company MailExternal mail received All content In IS Cleansed for Viruses, etc.
  • 10. Summarising, our patented business tool PVDTN can give your organisation the following benefits. Saves around 75% of your present telecom costs. Saves a substantial portion of your inter- locational travelling costs and time. Speeds up decision making. Ensures 100% security of your internal data bases. Converts your MLO (multi-locational organisation) into a VSO (virtual single office). Facilitates e-Commerce through a Public server connected to the Internet and the STS system
  • 11. To convert your present voice and datacommunications infrastructure into a PVDTN the following steps are required.The present LANs in each location will beconnected to the integrated PVDTN WAN throughrouters and the channel splitterA separate Internet LAN will be provided forconnecting the Public server (central location only)and internet browsing nodes (at all locations).The present voice / fax LAN through the existingEPABX will continue to be used for communicationswith organisation outsiders through the PSTN(public switched telephone network)..A separate voice / fax LAN will be set up at eachlocation and connected to the PVDTN WAN throughthe VDPS (EPAX with E&M trunks) and the channelsplitter.The present data WAN connectivity will be changedto point-to-point leased lines in tri-nodeconfiguration or with redundant links for alternaterouting..There will be no disturbance to the existing networktill the PVDTN WAN / LAN is ready for a smoothand quick cutover
  • 12. ADDITIONAL INFRASTRUCTURE FOR PVDTN AT CENTRAL LOCATION Existing infrastructure PSTN Additional infrastructure EPABX VDPS Channel LAN LAN splitter PS CS INTERNET INTRANET LAN LAN S S Secure Switch IS S S PVDTN INTERNET WAN IBN
  • 13. ADDITIONAL INFRASTRUCTURE FOR PVDTN AT OTHER LOCATION Existing infrastructure PSTN Additional infrastructure EPABX VDPS Channel LAN LAN splitter IBN S S INTERNET INTRANET LAN LAN S S IBN PVDTN INTERNET WAN
  • 14. Fig.12 NIB – II Srinagar TOPOLOGY Shimla Chandigarh IGW Delhi Noida Noida Jaipur Guwahati Lucknow PatnaGandhinagar / Ahmedabad Bhopal Mumbai Kolkata BRAS Chattisgarh IGW IGW Kolkata Mumbai H-bad IGW Pune BRAS Bhubaneshwar IGW Goa Bangalore Chennai Bangalore IGW Chennai IGW Pondicherry Back Office facilities – Web hosting, Customer servers, Messaging, Caching, Ernakulam Billing, etc. IGW CORE Router EDGE Router BRAS STM16 Thiruvanthapuram STM1
  • 15. Fig. 13 NIB – II ARCHITECTURE DIAL – UP CONNECTIONS TO OTHER CORE ROUTERS NATIONAL INTERNET EXCHANGE TO CONNECT PSTN NETWORK ALL ISPs AND PROVIDE COMMON INTERNATIONAL GATEWAY CORE ROUTER RASDIAL – UP EDGE ROUTERS NIEXSERVICE EDGE ROUTERS EDGE ROUTER EDGEROUTER TIER I BRAS BRAS BRAS BRAS EDGE ROUTERS EDGE ROUTERS EDGE ROUTERS EDGE ROUTERS MPLS VPN EDGE ROUTERS TIER II TIER II TIER II TIER II TIER II TIER II EDGE ROUTER TIER II TIER II TIER II TIER II DSLAMs DSLAMs Leased Lines from VPN Subscriber Premises
  • 16. Explanatory Notes on VPN VulnerabilitySlide 1 shows the topology of a typical ISP’s IP network over which both Internet and VPN services are laid out. This is the topology of BSNL’s NIB – ii. Five cities are connected in a full mesh connectivity to form the core IP back- bone across India. Other cities are connected through tri-node rings from the nodes of the core network through the Tier-1 switch at these nodes.Slide 2 shows the architecture of each of these nodes. The core router at the node sits on the Tier 1 switch. From these switches are taken the router connections for all the services – VPN, Internet through Broadband and PSTN. Thus you will note that there is continuous physical connectivity between all the routers in this IP network through the Tier 1 switch at each IP Node (POP). Thus there is continuous public domain access to the VPN routers.
  • 17. 1. In any IP network, public or private, the WAN ports of all routers in the network have continuous physical access to each other. Thus while a router port is engaged in communication with another in the network, a third port can have simultaneous communications with it. If the IP network is in the public domain (Internet) or has access from the public domain (VPN), this third port could be that of a hacker.2. Thus while the various security protocols like IP Sec, etc., can transport the data from one computer to another securely, the LAN and the data bases residing on it are exposed to public domain through a VPN which has public domain access for reasons explained in 1 above.3. For WAN computing it is necessary to have a real private network (at least for data communications). Once this is there then inter-locational voice / fax can be run over this network at marginal increase in the operating cost, using the patented PVDTN system.4. You should not expose your company data bases to the public domain through Internet, ISDN back-up, or VPN (which has public domain access) for reasons explained earlier in 1 above.5. The MPLS networks currently in vogue are another form of VPN network and are subject to the comments in 1 to 4 above.
  • 18. We do hope the above notes willexplain the security vulnerability ofyour data bases when these are onLANs connected to VPN (MPLS orother wise) of any service provider.If you wish to secure your databases 100% then use point-to-pointleased lines for inter- locationalcomputer connectivity.