Name of the
Gujarat State Wide Area Network (GSWAN)
which the project was taken:
Science & Technology Department, GoG
modernize the intra-governmental communication setup
administrative effectiveness and efficiency
facilitate improvements in the Quality of Public services
State Wide Area Network (GSWAN) is one of the largest IP based Multi Service
(Voice, Data and Video) IT infrastructure connecting 26 Districts, 225
Talukas to State capital Gandhinagar.
End to End IP based Backbone that supports Voice, Video, and Data on the
same Bandwidth from State Center to all 26 Districts and 225 Taluka centers.
Sachivalaya Campus Area Network (SCAN), having 7000 Fast Ethernet Input /
Output ports, connects all the Government offices and Government buildings /
complexes in State capital on Gigabit backbone.
DNS server, Mail server and database servers have been installed at the
State Data Center and have been integrated to the GSWAN / SCAN networks.
3300 District / Taluka Government offices of 32 Government departments and
semi government offices have been connected with GSWAN.
Gujarat implemented the state wide area network in the year 2001-02. The
end-to-end IP based network was designed for the service convergence (Voice,
video and Data) on the same backbone.
technology standards for the Gujarat ICT infrastructures became most crucial in
the given situation. Government of Gujarat, with an emphasis on the
state-of-the-art “Open Standard converged network, had succeeded in creating,
operating and maintaining required State wide ICT infrastructures, unparallel
any where in the country.
was prepared for State wide area network after undertaking a detailed
feasibility study. Inclusion of various offices and their location, traffic
load and its characteristics, Security, LAN/WAN protocols, topology, bandwidth
requirements and utilization, allocation of bandwidth ETC., were some of the
critical components considered while designing the project document.
Characteristics of Various climatic zones, coastal areas and identified disaster
prone areas were also taken into consideration while finalizing the project
specifications, as communication requirements varies from case to case basis.
report included number of the Government/PSU/board/corporations offices in each
District and Taluka. Based on this report need of
Wide Area Services for each these unit located, in & out side of the secretariat
was evaluated and a priority list was prepared indicating name and locations of
such offices to be integrated initially, and to be integrated after third year
of the operation.
(band width) needs were defined on the basis of traffic estimated between
various network nodes for initial phase and after third year. It was decided to
connect SC-DC with 2 Mb link and DC-TC with 64 Kb. All horizontal offices at
district were envisaged to 64 Kb links (if they were located out side district
collector’s premises) be connected with district. Horizontal offices within the
reach of LAN were directly interfaced with district center.
provisions were made for Dial-in lines for Remote Access Servers (RAS) located
at each DC to facilitate GSWAN access to all Government offices not connected on
Ethernet or leased line. Number of subscribers and the growth pattern were
analyzed for arriving at various resources requirements on time scale.
Assessment of Internet bandwidth, email service, web hosting resources, DBM
resources, Security, accounting/billing, storage and backup requirements, virus
protection etc... was carried out, keeping
e-governance objectives and network availability criterion into consideration.
Work was awarded on 1st march 2001 to the vendor for creation of GSWAN on BOOT
(Built Operate Own and Transfer) basis for a period of 8 years. GSWAN was
commissioned and accepted by Government of Gujarat on 26.12.2001.
ARCHITECTURE & TOPOLOGY
topology as conceived and designed for GSWAN was based on a hub-and-spoke
design philosophy, with three tiers in to it.
Secretariat Center (SC) at state capital, Gandhinagar,
where from the highest office of Government functions in the state. Various
departments and hundreds of subordinate offices located at the state capital are
connected to SC horizontally through SCAN (Secretariat Campus Area Network).
SCAN had about 7000 Ethernet I/O’s at
Gandhinagar and all these I/Os are interconnected
with GSWAN for information exchange. 300 GSWAN phone connections provided to
various offices at Secretariat for direct voice communication to any GSWAN node
in the state (at District or Taluka level).
Constitutes District Centers, or DC’s, located at district collector’s
office and multiple district level other offices connected with DC horizontally.
All 24 DCs, except Gandhinagar,
connected on 2 Mbps (E1) leased lines with SC. Gandhinagar
DC is a part of SCAN infrastructure. GoG evaluated
several options to achieve cost effective, flexible and scalable connectivity
for all horizontal offices and used Cat-5, OFC, JFC, wireless VSAT on case to
case basis. Ten dialup PSTN lines terminated on remote access server (RAS) at DC
enabling GSWAN access to all dialup users in Government. The dialup access is
given to all those Government offices in district, Taluka,
which are not considered for direct integration on Ethernet / leased / OFC /
- constitutes Talukas Centers, or
TC’s, located at
Taluka Mamlatdar’s office and
Taluka Development Office provision are kept for
connecting Taluka level other offices horizontally.
All 225 Talukas are connected to DC. (211 on 64 Kb
leased lines, and rest of 14 Talukas on Ethernet).
In each of the
stations, there is a state-of-the-art Router, which terminates the Leased Line.
These routers route IP packets intelligently throughout the network, and provide
the Quality of Service (or QoS) features necessary
to enable convergence of voice, video and data on to a single network
As per original plan, and
the network architecture, various GOG offices at DCs,
had to be connected horizontally using 64 Kb/s leased circuits. In addition to
this, at the Taluka level the current legacy
architecture supports only one data connection and nine voice connections. Since
2001 when existing GSWAN started functioning, many GoG
departments had progressively rolled out their applications which have been
riding on existing GSWAN, which had also been expanded to cater to all these
requirements by providing connectivity, through OFC / JFC / CAT-5 cabling and
using Broad Band Wireless Radios. As such, as on date, more than 3000
GoG offices at DC and TC locations have been
connected to GSWAN in the above manner.
Keeping the above in view
and also requirement of many Departments seeking for additional large bandwidth
to run their current and future applications, DST has already initiated the
process for enhancement of existing GSWAN. Accordingly, it is necessary to
increase the number of ports / elements of inter connections to aggregate higher
level of bandwidth by forming clusters of nearby districts in the form of a
inter connected RING / MESH and also for regulating and better management of the
traffic flow. This has been conceptualized after taking note of progressively
higher traffic flow during last two years. Considering the future traffic and
the geographic locations and current scenario, GoG
therefore incorporated six ring clusters architecture involving multiple
After having several rounds
of discussions with the Department of Information Technology; Government of
India (DIT) SWAN team; that the enhancement of GSWAN infrastructure should make
the best use of the legacy architecture and the existing networking components
so that an optimal architecture for enhanced GSWAN emerges, keeping in view of
the legacy network and the future requirements of 5-7 years.
Currently, Leased Line
Bandwidth, for connecting all 25 District Nodes to State capital
Gandhinagar and all 211 Taluka
Nodes to respective District nodes has been provided by BSNL, forming a ‘STAR’
topology network. High end ‘Carrier class’ WAN Infrastructure, having High /
Midrange Class Routers and Level 3 Switches, is under implementation at 12
district locations; to transport the Video, Voice and Data traffic from one DC
to the other DC directly inter-connected. Using the proposed infrastructure, the
local traffic can be routed directly to the destination directly, without
involvement of SC. This will reduce load on the network and will ensure more
efficient service delivery. Thus, by interconnecting nearby districts to form
RING / MESH, the Network traffic can be regulated more efficiently and
effectively. Under the GSWAN enhancement initiative, the entire infrastructure
is getting converted in to a MESH / RING topology, as shown in the figures.
GSWAN Current Status
7 Districts on 8 Mbps, 18 Districts on 4 Mbps and 1 district with 2 Mbps to
State Data Center at Gandhinagar using leased circuits provided by BSNL,
Reliance and Tata Tele Services.
225 Talukas to 26 District HQ on 2 Mbps leased circuits.
Interconnects more than
3300 District and Taluka level GoG offices.
70 departmental offices at District locations and 5 offices at Taluka
Locations have been connected to GSWAN
Over 20000 E-mail IDs created for Government officers all over the state.
Over 248 Websites are hosted for various departments/offices.
Mbps Internet Bandwidth terminated at GSWAN State Centre among >4800
uninterrupted and easy IP based Video-conferencing between various GoG
GSWAN acts as an information highway
and has facilitated intra governmental communications.
GSWAN provides a reliable
Video conferencing facility between State and District Head Quarters and now
it is being extended to Taluka Head Quarters.
GSWAN provides network
support to important e-Gov applications such as e-Dhara (Land Records), HMIS,
VATIS, HD-IITS, IFMS etc.