(1) The wideband network shall be designed in a manner to ensure absolute channel delay less than 25 milliseconds and channel delay asymmetry less than 0.1 milliseconds required for protection applications.
(2) The wideband network shall be configured for automatic switchover to the alternate path or route in case of failure of one path and the switching time delay shall be less than 50 milliseconds.
(3) Terminal equipment shall support automatic switchover function between the redundant modules, and modules and hardware required for supporting the automatic switch over shall be provided.
(4) New node, when added to the existing network, the terminal equipment shall be compatible to the existing one and shall be possible to integrate with the existing respective network management system either at State level or at Central level for complete monitoring, reconfiguration and control.
(5) Terminal equipment shall be designed with required number of directions considering the route redundancy and future expansion.
(6) The wideband network shall have the following communication interfaces, namely: -
(a) high speed bundled n x E1 support including ethernet, gigabit ethernet (GbE);
(b) high speed E1 channel support;
(c) 64 kilobits per second (kbps) and n x 64 kilobits per second (kbps) data and Protection channel support;
(d) low speed (300 -1200 bits per second) data channel support;
(e) voice (2 wires, 4 wires) channel support;
(f) data transport supporting network management channels; and
(g) Institute of Electrical and Electronics Engineers (IEEE)-C37.94 interface card for teleprotection of lines.
(7) The relevant standards and code of practice of wideband network as specified in the Bureau of Indian Standards (BIS), the International Telecommunications Union Telecommunication (ITU-T) and the International Electro-Technical Commission (IEC) shall be followed.
CHAPTER IV FIBRE OPTIC COMMUNICATION
26. Requirements of fibre optic communication. (1) All wideband communications shall be established using fibre optic communication consisting of underground fibre optic cable, optical ground wire (OPGW) or underground fiber optic cable (UGFO) and all dielectric self supporting (ADSS).
(2) Unarmoured cable shall be laid within a polyvinyl chloride (PVC) pipe or hume pipe or permanently lubricated high-density polyethylene (PLB HDPE) pipe.
(3) The cable shall be rodent and termite proof.
(4) The cable shall contain 12 or 24 or 48 numbers dual window single mode (DWSM) or dual window multi mode (DWMM) fibre depending on the local network design and requirement envisaged and shall consider the overall design and requirement of the backbone network.
(5) Approach cable for optical ground wire termination to fibre optic distribution panel (FODP) shall be armoured or unarmoured cable with suitable protection and matching the fiber count equal to optical ground wire cable to maintain uniformity and ease of utilisation of fibers.
(6) Ingress protection class 66 or better complaint splice enclosures shall be provided to encase the optical cable splices in protective, moisture and dust free environment.
(7) Maximum twelve fibres shall be terminated in a single splice tray.
(8) Fibre optic distribution panel (FODP) shall be ingress protection class 55 compliant and shall be of corrosion resistant, robust construction and shall allow both top or bottom entry for access to the splice trays and shall be provided with ground lugs.
(9) The overall optical fibre path attenuation shall not be more than as calculated below: -
(a) maximum attenuation at 1550 nanometer: 0.21 decibel (dB)/kilometer x total kilometer +
0.05 decibel (dB)/splice x no. of splices + 0.5 decibel (dB)/connector x no. of connectors + [ III ] 23 maintenance margin, if any, as specified in relevant standards;
(b) maximum attenuation at 1310 nanometer: 0.35 decibel (dB)/ kilometer x total kilometer +
0.05 decibel (dB)/splice x no. of splices + 0.5 decibel (dB)/connector x no. of connectors + maintenance margin, if any, as specified in relevant standards.
(10) Attenuation of the fibre shall be distributed uniformly throughout its length such that there are no point discontinuities in excess of 0.10 decibel (dB).
(11) Induced attenuation due to temperature shall be < 0.05 decibel (dB) (-60 deg. C to +85 deg. C).
(12) Fibre optic cable shall be protected from damage due to factors like crushing, bending, twisting, tensile stress and moisture, wide temperature variation, Hydrogen evolution, etc.
(13) Short circuit current for optical ground wire shall be 6.32 kilo ampere for 1.0 second (for 220 kilo volt and above
(14) Direct current (D.C.) resistance at 20 deg. C shall be < 1.0 ohm/kilometer.
(15) Everyday tension (EDT) of optical ground wire shall be < 20% of ultimate tensile strength (UTS).
(16) Maximum permissible dynamic strain shall be +/- 150 micro strains.
(17) Proof stress level shall be > 0.69 gigapascal.
(18) Maximum chromatic dispersion shall be 18 picosecond (ps)/(nanometer (nm) x kilometer (km)) at 1550 nanometer (nm), 3.5 picosecond (ps)/(nanometer (nm) x kilometer (km)) at 1288-1339 nanometer,
5.3 picosecond (ps)/(nanometer (nm) x kilometer (km)) at 1271-1360 nanometer, as the case may be.
(19) Zero dispersion wavelength shall be 1300 to 1324 nanometer.
(20) Maximum zero dispersion slope shall be 0.092 picosecond (ps) /(nanometer2 x kilometer(nm²xkm).
(21) Cable cut- hall be <1260 nanometer (nm).
(22) Bend performance shall be-
(a) at 1310 nanometer (nm) (75±2 millimeter(mm) dia Mandrel), 100 turns: Attenuation Rise <0.05 decibel (dB);
(b) at 1550 nanometer (nm) (30±1 millimeter(mm) radius Mandrel), 100 turns; Attenuation Rise <0.05 decibel (dB);
(c) at 1550 nanometer (nm) (32±0.5 millimeter(mm) dia Mandrel), 1 turn; Attenuation Rise <0.50 decibel (dB).
(23) Polarisation mode dispersion coefficient shall be <0.2 picosecond/kilometer½ (ps/km½).
(24) The relevant standards and code of practice of fibre optic communication as specified in the Bureau of Indian Standards (BIS), the International Telecommunications Union Telecommunication (ITU-T), the International Electro-Technical Commission (IEC), the Institute of Electrical and Electronics Engineers (IEEE), the Electronic Industries Association/ Telecommunications Industry Association (EIA/TIA), the Bell Core, the Telecommunication Engineering Centre (TEC), the American Society for Testing and Materials (ASTM) and the Electro chemical Impedance Spectroscopy (EIS) shall be followed.
CHAPTER V POWER LINE CARRIER COMMUNICATION