strengthening of telecom transmission network by carrying out patch-work of optical fibre routes under the jurisdiction of ranchi nwo ( maintenance ) division of etr ranchi sub-region . carrying out patchwork in different sections of ofc routes to reduce the optical fibre loss in the section and hence strengthen the telecom transmission network and the performance of long distance high bandwidth data transmission equipments . , patchwork , excavation of trenches in hard / morum soil to a standard depth of 1 . 65m as specified in laying practices of of cable , and backfilling the excavated trenches after laying the plb pipe with or without protection , excavation of trenches in soft rocky soil to a standard depth of 1 . 35m as specified in laying practices of of cable , and backfilling the excavated trenches after laying the plb pipe with or without protection , excavation of trenches in hard rocky soil to a standard depth of 1 . 35m as specified in laying practices of of cable , and backfilling the excavated trenches after laying the plb pipe with or without protection , laying of plb pipe with sockets , pulling of ofc , and allied works ( viz . replacing couplers and bank filling in case of manholes sealing of plb ends , refilling sand , re-fixing rcc cover and backfilling in case of joint chamber / manhole ) . no . charges to be paid for opening of manholes/joint chamber . , horizontal directional drilling for laying of u/g plb/ hdpe pipes to a standard depth of 1 . 65m as specified in laying practices of of cable , by hdd method , blowing of of cable , and allied works ( viz . replacing couplers and back filling in case of manholes , sealing of plb ends , refilling sand , re-fixing rcc cover and backfilling in case of joint chamber/ manhole . ) no charges to be paid for opening of manholes/joint chambers . , providing cc protection in the ratio of 1:2:4 for encasing plb pipe / gi pipe/dwc pipe in roads , bridges , crossings and culverts and for low depth protection , or on wheel guard of bridge as specified in the construction practices of of cable construction , including materials . , fixing of pre-supply cast rcc joint chamber with size 1 . 2m inner dia x 0 . 8m depth with rcc cover . , digging of pit 1 meter towards jungle side on each manhole / joint chamber for fixing of route /joint indicator , including supplying , fixing and concreting of routes/joint indicator painting and sign writing of route/joint indicators . , transportation cost including cost of loading & unloading as well as dropping the materials at site from respective departmental stores . ** , cable splicing , cable splicing work 24f in route / termination box , cable splicing work 48f in route / termination box