PRIVATE VOICE - DATA TELECOM NETWORK

“A BUSINESS TOOL YOU CANNOT AFFORD TO BE WITHOUT”

• 100% secure, fixed operating cost,

private network.

• No usage charge.

• Set-up cost pay back

in 1 to 2 years

• Ideal communications backbone

for ERP

• Cuts present telecom costs

by up to 75%.

• Unlimited inter-locational

communications - speech, fax, data.

• High network up-times.

DELHI

MUMBAI

KOLKATA

• Voice and voice-data conferencing.

• Integrates voice, fax, data over

analogue and digital leased lines.

• Connects any place in the world.

CHENNAI

• Connects any place in the world.

• Group III fax - no time lost in

document scanning.

• Set-up cost - 50 to 60% of conventional

digital leased line solutions; 25% of PAMA

VSAT solution.

• Annual operating cost - 75 to 80% of

conventional digital leased line solution;

20 to 25% of PAMA VSAT solution.

• Normal telephone type

speech - no delay or

distortions.

• Eliminates STD calls between

Company locations.

• 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

From Delhi

From Nagpur

From Mumbai

From Chennai

V

D

Digital n x 64 KBPS

Leased Lines

Analogue

Leased Lines

From locations in same city

or outstation location

Trunk line cards KDI

Voice / fax cards KVF.8

Data cards KHS.2 / KLS.1

Tel

LINE SPLITTER – KM2100

Fig 1

PVDTN NODE ARCHITECTURE

D

P

S

Modem

LCE 2W E&M

Fax

LAN BUS

Server

LAN Nodes

IP RouterCircuit switch router

Residential Connection

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

3

3 3 33

2 2

2

2

2 11

1

1

11

4

4 44

4

4

TYPICAL STATE WAN CONFIGUSING MULTI-TIER PVDTN

FOR INTEGRATED VOICE, FAX, DATA COMMUNICATIONSUP TO GRAM PANCHAYAT

WITH 100% ALTERNATE ROUTING / REDUNDANCY

768 KBPS

384 KBPS

2 X 128 KBPS

2 X 2WE&M

1

11

62.42 KBPS6.22 KBPS

320.7 KBPS

2 MBPS8

88

8

8

4

4

4

6

3

6 6

6

6

3

3

Fig 2

KOLKATA

4

4

4

4

4 4 4

4

4

4

4

4

4 MBPS

2 MBPS

1958.6 KBPS 4 MBPS

2 MBPS

8

8

8

88 8

8 8

8

8

88

8

4

4

4

44

4

NOTE : Total number of trunks emanating from Kolkata is 144 (8 x 18). Using the Erlang loading

norm this can serve 1152 extensions in Kolkata. Thus 1158 officers may be provided NET

telephones and they may be spread across Writers’ Building, New Secretariat, and the Secretariats

at Salt Lake

7

3

4

6

Chandigarh

Delhi

Gurgaon

IHC

227.2

KBPS

140.64

KBPS

300.40

KBPS

118.48

120.96

KBPS

103.76

KBPS

192 KBPS

256 KBPS

512 KBPS

320 KBPS

Fig 3CII – PVDTN

Single Tier Network

WIDE AREA NETWORK TOPOLOGY

65

9

9 4

6

3

3

3

2

Mumbai

Hyderabad

Kolkata

Bangalore

118.48

KBPS

120.96

KBPS

110.64

KBPS

KBPS256 KBPS

128 KBPS

6

63

33

X

Y

X + YX + Y

A

B

C

MAX (X,Y)

Fig 4Fig 4

TRITRI--NODE FORMATIONNODE FORMATION

IN PVDTNIN PVDTN

USED FOR SINGLE AND MULTIUSED FOR SINGLE AND MULTI--TIER NETWORKSTIER NETWORKS

1. 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.

Fig 5Schematic Diagram of STS

INTERNET

STS IS

PS

Storage

INTRANET CS

•PS, IS, CS have same fields which are synchronised at each

connection.

•CS collates data from internal data bases to pass on to PS

through IS, and also distributes information received from the

interactive Web pages in the PS to the relevant data base.

•The information stored in the Storage associated with the PS

helps to carry out e-commerce activity like placing orders, internet

banking. Etc. The storage is updated in each STS cycle.

2

0

1

DB2DB1

Public Server

For Company information,

Inter-active Web pages

and

Internet mail Gateway

PS

Company

data bases

Company

information

and

mail server

CS

3-Pos Electro-mechanical

RJ45 switch

Fig 6

Switching arrangement of

STS

Internet LANCompany LAN

Intermediate Server

For transferring information

and mail back and forth

Between CS and PS

(IS)

Switch changes state on

Automated settable commands

from software in IS

1 2

0

Nodes for

Internet browsing

3-Pos EM RJ45

Switch

State changes

With manual command

From Node

IL

I/O

Box

CL

I/O

Box

Fig 7 – Overall datagram

Company

External mail

Company Info

Web Info

IS PSCS

Company Info

Web Info

Fig 8

Step 1 – IS connected to CSIS PSCS

Changes in

Web

Info received

Changes in

Company

Info received

Incoming Outgoing

Company

External mail

Company Info

Web Info

Fig9

Step 2 – IS in Null after connecting to CSIS PSCS

Changes in

Company

Info received

Outgoing

Mail

received

Company

External mail

Incoming

Mail

received

Outgoing

Mail

received

All content

In IS cleansed

For viruses etc

Fig 11

Step 4 – IS in Null after connecting to PS

Company

External mail

Company Info

Web Info

Fig 10

Step 3 – IS connected to PSIS PSCS

Changes in

Web

Info received

Outgoing

Mail

received

Incoming

Mail

received

Changes in

Company

Info received

Company

External mail

Company Info

Web Info

Step 4 – IS in Null after connecting to PSIS PSCS

Changes in

Web

Info received

Incoming

Mail

received

All content

In IS

Cleansed for

Viruses, etc.

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

To convert your present voice and data communications infrastructure into a PVDTN the

following steps are required.

� The present LANs in each location will be connected to the integrated PVDTN WAN through routers and the channel splitter

� A separate Internet LAN will be provided for connecting the Public server (central location only) and internet browsing nodes (at all locations).

� The present voice / fax LAN through the existing EPABX will continue to be used for communications with organisation outsiders through the PSTN (public switched telephone network)..(public switched telephone network)..

� A separate voice / fax LAN will be set up at each location and connected to the PVDTN WAN through the VDPS (EPAX with E&M trunks) and the channel splitter.

� The present data WAN connectivity will be changed to point-to-point leased lines in tri-node configuration or with redundant links for alternate routing..

� There will be no disturbance to the existing network till the PVDTN WAN / LAN is ready for a smooth and quick cutover

ADDITIONAL INFRASTRUCTURE FOR PVDTNAT CENTRAL LOCATION

EPABX

LAN

VDPS

LAN

PSTN

CSPS

Channel splitter

Existing infrastructure

Additional infrastructure

INTERNET

LANINTRANET

LAN

INTERNET

PVDTN

WAN

IBN

Secure Switch

IS

S

S

S

S

ADDITIONAL INFRASTRUCTURE FOR PVDTNAT OTHER LOCATION

EPABX

LAN

VDPS

LAN

PSTN

IBN

Channel splitter

Existing infrastructure

Additional infrastructure

INTERNET

LANINTRANET

LAN

INTERNET

PVDTN

WAN

S

S

IBN

S

S

NIB – IITOPOLOGY

Kolkata

Guwahati

Lucknow

Chattisgarh

Bhopal

Jaipur

Gandhinagar / Ahmedabad

Chandigarh

Shimla

Srinagar

Kolkata

Delhi

IGWIGW

IGW

Mumbai

BRAS

NoidaNoida

Patna

Fig.12

PuneIGW

IGW

IGW

IGW

IGW

H-bad

BRAS

Pondicherry

Chennai

Thiruvanthapuram

Ernakulam

Mumbai

Chennai

Bangalore

Bangalore

CORE Router

BRAS

STM16

STM1

EDGE Router

Goa

Bhubaneshwar

Back Office facilities – Web hosting,

Customer servers, Messaging, Caching,

Billing, etc.

NIB – IIARCHITECTURE

CORE ROUTER

TIER I

EDGE ROUTERS

EDGE ROUTERS

BRAS BRAS BRAS BRAS

NATIONAL INTERNET

EXCHANGE

TO CONNECT

ALL ISPs AND PROVIDE

COMMON

INTERNATIONAL

GATEWAY

NIEX

EDGE ROUTER

Fig. 13

RAS

PSTN NETWORK

TO OTHER CORE ROUTERSDIAL – UP

CONNECTIONS

DIAL – UPSERVICE

EDGEROUTER

EDGE ROUTERS EDGE ROUTERS

TIER II TIER II

TIER II TIER II

TIER IITIER II TIER II

TIER II TIER II

TIER II

DSLAMs

DSLAMs

EDGE ROUTERS

Leased Lines from VPN Subscriber Premises

MPLS VPN

EDGE ROUTER

EDGE ROUTERS

EDGE ROUTERS

Explanatory Notes on VPN Vulnerability

Slide 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 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.

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 toanother securely, the LAN and the data bases residingon it are exposed to public domain through a VPNwhich has public domain access for reasons explainedin 1 above.

3. For WAN computing it is necessary to have a realprivate network (at least for data communications).Once this is there then inter-locational voice / fax can berun over this network at marginal increase in theoperating cost, using the patented PVDTN system.

4. You should not expose your company data bases to thepublic domain through Internet, ISDN back-up, or VPN(which has public domain access) for reasons explainedearlier in 1 above.

5. The MPLS networks currently in vogue are another formof VPN network and are subject to the comments in 1 to4 above.

� We do hope the above notes will

explain the security vulnerability of

your data bases when these are on

LANs connected to VPN (MPLS or

other wise) of any service provider.

� If you wish to secure your data

bases 100% then use point-to-pointbases 100% then use point-to-pointleased lines for inter- locationalcomputer connectivity.