http://www.mtp.indianrailways.gov.in/uploads/files/1413262648733-STM Topology.jpg Topology.jpg
Optical Fibre Cable Communication System
1)One combine link of STM-1 & STM-4 have been installed for the section from Noapara to Kavi Subhash of Metro Railway for providing backbone support to all telephone, signalling, SCADA and other circuit Via 2 Mb/s.
2)One 8 Mb/s link has been installed for the old section from KDMI to KMUK for providing telephone. But at new section telephone has been provided through 2Mb/s.from Netaji to Shahid Khudiram. Kavi Subhash station telephones have been provided from local KKVS Exchange.
3)Three nos. Optical Fibre Cable has been laid Via UP & DN line in Old Section from KDMI to KMUK tunnel, and one no. Optical Fibre Cable has been laid Via UP line in new section from KMUK to KKVS.
Optical Fibre Cable (Telecom) Layout in "North - South Corridor" of Metro Railway Kolkata.
1. OFC LAYOUT KNOA AND NOA CD
2. OFC LAYOUT N-S
Optical Fibre Cable (Telecom) Layout in "East - West Corridor (GREEN Line)" of Metro Railway Kolkata.
1. https://mtp.indianrailways.gov.in/uploads/files/1698396179079-OFC Layout Plan.pdf