(1) Very small aperture terminal communication shall be used for supervisory control and data acquisition (SCADA) control functions of power system operation and shall not be used for primary protection function of power system as geo-stationery satellite hop delay is 240 milliseconds.
(2) Very small aperture terminal shall be able to work with all geostationary satellites to the extent possible, visible from India and work efficiently from all parts of India.
(3) Very small aperture terminal shall work either on Ku-band or C-band or extended C band or any other band for interruption free continuous operation in extremely rainy (more than 10 millimeter/hour intensity) and cloudy conditions.
(4) Very small aperture terminal communication shall be adopted after ensuring link availability of
99.5 per cent. and required level of signal strength.
(5) Very small aperture terminal communication shall not be part of national or State wideband backbone network.
(6) All regulatory clearance from regulatory bodies shall be taken to operate the very small aperture terminal communication.
(7) All regulatory guidelines including size of the antenna shall be followed.
(8) Pool band width feature shall be adopted for the very small aperture terminal network.
(9) Uplink and down link configuration of very small aperture terminal communication shall be redundant (1 + 1) at Hub.
(10) Very small aperture terminal communication network shall be designed based on Frequency Time Division Multiple Access (FTDMA) or Multi-frequency Time Division Multiple Access (MFTDMA) or Single Channel Per Carrier Demand Assigned Multiple Access (SCPC DAMA) technology or any other proven future technology with configurable data rate as per data communication requirement.
(11) Bit error rate shall be lesser than 1 X 10 -7 (data) to 1 X 10 -4 (Voice).
(12) Very small aperture terminal communication shall support broadcast, unicast, multicast, transmission control protocol (TCP) spoofing.
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(13) Very small aperture terminal communication shall support IP RJ45 (IP or E&M).
(14) Receiving device shall support the International Electro-Technical Commission (IEC) - 60870 -5- 104 and the International Electro-Technical Commission (IEC) - 60870 -5-101 protocols for interfacing data as well as to IPv4, IPv6, RIP v1, v2, Address Resolution Protocol (ARP) / Virtual Local Area Network (VLAN), Internet Control Message Protocol (ICMP), Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Telnet, Internet Group Management Protocol (IGMP), v1, v2, Simple Network Management Protocol (SNMP) for networking utilities.
(15) Very small aperture terminal communication system shall be designed for 230 V +/- 30% alternating current (AC) power supply at 50 Hz.
(16) Very small aperture terminal communication system shall be designed for trouble free operation at temperature range -10 deg. C to 55 deg. C and humidity up to 95 per cent. non-condensing, and wind speed of minimum 80 kilometers per hour (kmph).
(17) Very small aperture terminal communication system shall be able to deliver bi-directional composite data traffic.
(18) Round trip delay shall be less than 800 milliseconds (ms).
(19) Very small aperture terminal in door unit (IDU) (for remote sites) shall support Transport Control Protocol/ Internet Protocol (TCP/IP) without the need of an external router.
(20) Very small aperture terminal in door unit (IDU) shall have separate storage banks for software and firmware, to enable configuration changes pertaining to either the terminal (firmware) or the overall system architecture (software), without affecting the other.
(21) Very small aperture terminal shall be able to take the software and firmware downloads from the hub over the air, without any disturbance to the online user traffic while in operation on per terminal (Unicast), per group (Multicast) or entire network (Broadcast) basis.
(22) The relevant standards and code of practice of very small aperture terminal communication as specified in the Bureau of Indian Standards (BIS) and the International Telecommunications Union (ITU-R) shall be followed.
CHAPTER VIII RADIO FREQUENCY COMMUNICATION