C-DOT's GPON (Gigabit Passive Optical Network) technology offers an excellent mix of triple play services (voice, data & video) to end users. This is an indigenous development of C-DOT and offers advantages in terms of appropriateness for Indian environment, Innovation & local manufacturing. Current technology delivers a downstream data rate of 2.5 Gbps and an upstream data rate of 1.25 Gbps on a single fibre over a distance of up to 60 Kms. One optical fiber from OLT can be shared with up to 128 users. Signals from the OLT to the ONT are encrypted (secure) and then broadcasted to workstation devices. Signals from the workstation devices are then multiplexed back to the OLT.
In 2011, Indian Minister for Communications and IT Kapil Sibal, transferred Gigabit Passive Optical Network (GPON) Technology to seven telecom manufacturers in public and private sectors – Indian Telephone Industries Ltd. (ITI), Bharat Electronics Ltd (BEL), VMC Systems Ltd, United Telecoms Ltd. (UTL), Sai InfoSystem (India) and S M Creative Electronics Ltd . In addition, Technology transfer agreement has also been signed with Tejas Networks Limited for customized development and Electronics Corporation of India Ltd (ECIL). US patent (Patent number: 10567075) for GIS based centralized fiber fault localization system was filed in 2016 and received in 2020.
Adoption of GPON in enterprise environment was studied by Stanislav Milanovic. Applied GPON based POLs in the enterprise environment enabled the convergence of voice, data and video onto a single strand of single mode fiber, which reduced the network infrastructure hardware to a fraction of what is required in terms of cabling and electronics in the conventional Ethernet approach. The solution not only enabled easier maintenance, but also improved efficiency with regard to end user-related, adds, moves and changes. Deployed GPON based POLs in the enterprise environment extended service to any stationary Ethernet end point. It enabled the delivery of reliable and highly secure unified network providing IP voice, data, and any type of video over a single fiber. It also increased the size of the network building block which greatly simplified enterprise network deployment, operation, and management. The solution supported energy conservation, since the optical LAN infrastructure utilized passive components like optical distribution hubs and fiber plant that required no power or cooling, resulting in significant energy savings. Implemented POLs provided immediate return on investment and a low total cost of ownership compared to copper-based LANs.
GPON Vs EPON
EPON and GPON have their own advantages and disadvantages. GPON is better than EPON from the performance index. However, EPON has the advantage of time and cost. GPON is catching up and looking forward to the future broadband access market. GPON will be more suitable for customers with high bandwidth, multi-service, QoS and security requirements and ATM technology as the backbone. For cost-sensitive, QoS, security, less demanding customer base, EPON has become dominant.
EPON began massive deployments in Japan and South Korea. In 2005, China Telecom started EPON field trial in 4 provinces to learn how to deploy EPON. Interoperability is critical for the success and deployment of EPON widely, so China Telecom started IOP research in 2005. In 2007 CTC achieved large scale and all‐round chip and system EPON IOP the first time in the world (3 chip vendors, 10 system vendors). For operators with 1G EPON-based deployments — particularly Korea Telecom, Japan‘s NTT DOCOMO access, China Telecom and China Unicom, 10G EPON is quickly becoming the next-generation technology of choice for providing both asymmetric and symmetric 10 Gbps services. 10G EPON equipment shipments and revenue continue to grow, driven currently by China Telecom, which is in the process of upgrading a portion of its first-generation 1G networks to provide more bandwidth to multi-dwelling units, or MDUs.
EPON technology matured with Chinese Telecom service providers active participation. What about Indian Scenario?