This update addresses some apprehensions based on past experiences of the members of internet services  in the colony. Some building societies have expressed reservations about the requirement of uncontrolled access to terraces.

Tata Sky network is a passive network up to the end user. This reduces field failures significantly. Terrace access will be required during the network deployment only. Once the network is in place all new connections will be given without terrace access.

Generally two network schemes are used in wired telecom networks–

1. Hub and Spoke – Telephone lines and copper internet broadband lines follow this scheme. Each end user is connected ( spoke) directly to central exchange ( Hub). Extensive cables are laid to provide last mile connectivity to each user.
2. Ring loop and linear branch – An optical fiber cable is laid in a ring loop covering the whole area. Ring has multiple ring node stations (labelled as  S1). This loop starts from the main server and loops back and provides ‘Type B’ protection against loop break. One cable  break in the loop is tolerated and internet service is not affected.

Each S1 serves a specific building through a Drop Line. Since this building and its  units are on the ring loop they get the benefit of Type B protection.

Each S1 also serves as a distribution  point of the internet to surrounding buildings. One cable connects all surrounding buildings using a linear scheme.

Typically S1 will have ring cable IN and OUT and up to 2 distribution branch  lines. All other buildings will have one IN  and up to two Out lines. Last building on each branch will have only one cable as IN.

Thus except the last building on each branch line, all buildings will have minimum 2 and maximum 4 lines.

Tata Sky has a central office in Bavdhan near Chandni Chowk. They have a ring loop presently running upto DSK Ranwara. They had proposed extending this loop to the colony by placing three S1 stations in the colony.

We have managed to bargain a scheme where multiple buildings will be put on the ring loop to extend the benefit of ‘loop-break’ protection despite extra cost of increased cable length to them.

These S1 buildings will have two benefits as below:

1. Loop-break protection.
2. Internal network deployment can be started in Phase 1 itself. Members in these buildings can get internet connections immediately thereafter.

All other buildings will be on linear segments and will be taken up in phase 2.

Draft of ‘Ring Loop’ scheme is as shown.