The Centre for Development of Telematics (C-DOT) is the government’s telecom technology development centre. Established in August 1984, it was vested with full authority and total flexibility to develop state-of-the-art telecommunication technology. Its executive director VVR Sastry spoke to HT on a range of issues. Excerpts:
The recently announced draft national telecom policy (NTP) 2011 expects indigenous manufacturing and R&D to play an important role in the telecom sector in future. Is India’s R&D geared up to deliver?
C-DOT has demonstrated in the past that it can be a reliable source of technology for the Indian telecom manufacturers. Telecommunication professionals can recall the contribution of C-DOT technology which gave a tremendous boost to telecom manufacturing in the country in 1980s.
Prior to the advent of C-DOT technology, there were only two telecom manufacturers in India. With the availability of C-DOT RAX/MAX switching technology, there were as many as 40 manufacturers at one time. C-DOT manufacturers built up capacities and delivered up to 10 million lines a year. C-DOT has continued to not only provide technical support to telephone exchanges but has also provided hardware and software upgrades to take care of intricacies of interworking in a dynamic network.
What is GPON technology?
C-DOT GPON (Gigabit Passive Optical Network) is
an indigenously developed, industry standard system which can be used to provide triple play (voice, video and data) through Fibre to the Home (FTTH) services. It consists of a central office equipment called OLT and customer premises equipment called ONT. The information from central office to the customer premises and back, flows through optical fibre cable, which is essentially a light pipe.
The information carrying capacity of an optical fibre is practically limitless. The present GPON standards specify 2.5 Gbps downstream and 1.25 Gbps upstream data capability. The large data carrying capability is important for Indian villages too where low literacy levels necessitate information with greater graphic and audio content for better dissemination.
Can GPON carry cable TV signal also?
Apart from voice telephony, high speed internet access and IPTV, the C-DOT GPON has provisions to carry cable TV signal too, all through a
single optical fibre. Another important advantage is that it can carry information from a central office to subscribers
up to 20 km away without needing any intermediate repeaters thus doing away with the requirement of power, shelter and upkeep services at the intermediate locations.
C-DOT GPON can be used to provide a future proof broadband solution to village panchayats and take the benefits of e-education, e-governance, e-commerce and e-medicine, etc., to our rural and urban populace, leading to a significant growth in GDP.
Has the technology been commercially deployed?
Yes, we do have an installation at Ajmer in BSNL network where it has been used to offer FTTH (Fibre to the Home) services consisting of triple play (voice video and data). It was inducted into BSNL network by Sachin Pilot in December last year.