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Empowering the nation's leading power carrier to scale up operations across 5 states Commtel successfully commissioned a complex Long Haul network upgradation with minimal disruption. Deploying 10,023 km of meshed OFC based high capacity network across 136 sites. On time.

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The scale was colossal. The task highly critical. And timelines challenging. It called for precision planning and execution. With no room for error.

The Task Given its experience and impeccable capability in delivering turnkey solutions for customers since 1998, Commtel was entrusted by a Central Transmission Utility in India with the Communications Equipment Package for Establishment of Fibre Optic Communication System in the Eastern Region of its operations. This region sees major demands from core industrial centres of strategic national importance on account of being rich in natural resources such as coal and minerals. The region is served by a mix of 765kV, 400kV and 220kV lines with several thermal and hydroelectric power plants feeding the grid, which supplies over 125 Billion Units annually. The Communication System implemented by Commtel plays a key role in day to day grid operations monitoring, supervision and control over the inter-state transmission system, scheduling of despatch of electricity within the region and exchange of operational surpluses amongst interconnected regions. The whole gamut of system design, engineering, procurement, integration, Factory Acceptance Testing, Installation, Commissioning, Site Acceptance testing and handover of the system was in Commtel's scope and Commtel was ready to deliver.

The Challenge The Eastern region comprised of 5 states in India with a land area of 425,432 sq. km. The project had 136 sites with 10,031 Kms of linear OFC distance. Delivering a project for a customer that transmits about 50% of the total power generated in India on its transmission network was always going to be a job that had to be done with utmost engineering precision and within extremely strict timelines. Ultra long repeater-less hops, stringent physical conditions of working in high electromagnetic fields and non-air conditioned rooms that called for tailored cabinet design and layout were all challenges that stood as a test of Commtel's overall competence.


The Highlights w Meticulous planning and bespoke designing capabilities within Commtel allowed it to complete the project within the stipulated contractual period. w Commtel was tasked with migrating from existing microwave network to the newly deployed state of the art optical transmission system with minimal disruption in service and was achieved with highest precision. w Intensive testing of equipment at local facility before dispatch to site allowed for seamless deployment, a standing testament of Commtel's robust internal practices. w Commtel provided a mix of services to cater to current and future needs including mission critical Ethernet services, synchronous and asynchronous data, video conferencing, VOIP and analogue voice. w 5 SDH links with a distance of over 200kms between them were deployed without any repeater stations. w All optical amplification solutions with COTS devices. w Superlative design with battery backup for uninterrupted services even during power outages.

The Solution Some peculiar physical conditions and complex engineering requirements made Commtel come up with unconventional ideas and custom-fit solutions. A meshed network architecture with 151 SDH links was designed. Further strengthening its dependable relationship with Coriant, Commtel offered the hiT 7025 as STM 4 and hiT 7080 as STM 16 equipment with redundant hardware, 1+1 MSP for all SDH links and RSTP for Ethernet ring protection. Various user data types were segregated using VLANs. Configurations with up to 5 MSP directions of SDH traffic were provided. A total of 156 numbers of Drop-insert multiplexers from Loop Telecom (AM3440) were provided for synchronous and asynchronous data interfaces, analogue voice, and VF E&M trunks. 14 numbers of low-level cross-connect switches were provided at key points for interconnections of the lower order voice and data services. The 151 SDH links with redundant configuration was centrally managed through a TNMS at National and Regional centres. In order to assure the availability of the system, telecom power supply systems with 8 hours battery backup were provided. Long-haul spans exceeding 200km are a key accomplishment of this project. This was made possible through a combination of advanced optical transceivers, optical booster amplifiers and pre-amplifiers to push the limits of repeaterless fibre optic transmission to unprecedented levels using established, off-the-shelf devices without resorting to exotic components. Substantial cost-savings in capex and opex are achieved by eliminating unnecessary repeaters at locations with no actual communication requirements.

The Benefits Commtel's 3c delivery model of Conceptualize, Construct and Care stood true to its core as it delivered on the promises made through different stages of the project. Commtel's detailed designing, strong relations with partners and customer centric project management made sure that that the customer's expectations were well surpassed. It has been Commtel's endeavour to make the customer as the centre of their universe and to always think on their behalf. Uninterrupted access to Commtel's expert personnel along with timely updates regarding the progress made in the project brought to the fore an amicable environment further enhancing the working camaraderie from both sides..


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Empowering the Nation's Leading Power Carrier to Scale up Operations Across 5 States  
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