Background
Delhi University has two campuses – the North and South Campus. There are a few colleges located outside the campuses as well. The North Campus has a wide area compassing of an approximate land of 2 sq km.

Objective
To leverage the benefits of IT, the University decided to implement a campus wide network at both the campuses.

Guidelines
The network implemented for Delhi University was based on state-of-the-art gigabit technology using E-CAT5 UTP and Fiber Cabling. The aim was to deploy infrastructure that would be able to support the latest technologies in the future. Following guidelines were followed in executing the plan:

      a) The infrastructure was to be future proof in terms of supporting new           technologies and bandwidth capabilities.
      b) The entire cabling was to be done based on EIA/TIA standards.
      c) The number of nodes within the building to be planned for maximum.
      d) Use of E-CAT5 cabling product (UTP) for cabling within the building.           The cable and other related components should be able to support           Gigabit speeds.
      e) Use of 6 Core Outdoor Fibre cable for a connectivity between the           buildings.
       f) The UTP nodes were to connect using 10/100 Mbps connectivity and           the backbone connectivity between switches would be based on          Gigabit Ethernet.

Physical Layout
There are 67 buildings in North Campus and 19 in South Campus to be networked together. It included various departments, colleges and university hostels.

The physical topology of the network at North Campus in relation to connectivity of buildings is three tier while the topology of the South Campus is two tier. The network has a core connection, 5 zonal locations and then end points named as Department locations.

The departmental locations connect to the nearest location in case of three tier or they connect to the core location in case of two tier topology. This grouping was done based on geographical spread of the locations. Further locations connect back to the core location.

Core Location

• North Campus:
  The University Computer Center was chosen as the core location. It would connect to other zonal locations and would act as the Zonal location for buildings near it.
  
• South Campus:
  The University library was chosen as the Core Location. This would connect to the other buildings in the campus.

Zonal Locations
Five Zonal locations were selected

• Computer Center (co-located with the core location)
• Physics Old
• Agri Economics
• Tutorial Building
• CSEC (Science Center)

Outdoor Cabling- Armored Fibre Optic Cable
The connectivity between locations i.e. the backbone is over 6 Core Outdoor Armored Fibre Optic Cable (make Krome Communications) running Gigabit Ethernet on it. Both multimode and single mode cables have been used at the North Campus depending on the distances between the two locations to be connected. Only single mode cable has been used in the entire campus for connectivity between the two locations.

The zonal locations are connected to the Computer Center completing the connectivity across the campus.

The outdoor fibre has been laid underground. The fibre has been laid through the HDPE ducts for the same. The HDPE ducts have been laid in trenches dug up to 3 feet throughout the campus.

Two type of HDPE ducts have been used

• 50 mm outer dia
• 32 mm outer dia

Criteria for Laying Fiber Through HDPE Ducts
The following criteria was followed for laying of fiber through the HDPE ducts

• 50 mm duct has been used to carry 2 fibre cables only. This provides a scalability of pulling 1 extra fibre at a later stage through the same
• 32 mm duct has been used to carry 1 fibre cable
• The backbone connectivity i.e Fibre cable between respective Zonal location and the computer center has been laid through the 50 mm duct. This has been done to ensure future scalability.
• The ducts used are prelubricated allowing the use of techniques such as Fibre blowing etc and making the laying process easier.

These ducts have been laid through not only the open trenching or manual trenching but trenchless digging has also been deployed to cross the MCD roads. The complete digging layout and the HDPE duct layout, depicting the trenchless digging, has been enclosed herewith.

Cable pulling pits have been provided for maintenance and trouble shooting purpose at desired locations. The HDPE ducts at these pits have been joined together using the HDPE coupler of respective sizes.

Indoor Cabling – UTP E-CAT5 Cabling
The user density within the building is varying. A total of 3198 UTP nodes have been implemented in these buildings.

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