pre-installed. The microducts can be branched very easily in the network. At any place of choice, a window cut is made in the protective duct and the microduct of choice is cut. This microduct is then connected, using a simple push/pull connector, to a microduct that branches to the desired location. After all connections are made, an individual microduct path has been created in the network. A microduct cable can then be jetted through the microduct, without the need to make a splice. Advantages over traditional cabling A branch can be made simply, any place, at any time. Low initial costs. The network can grow on demand. Easy to install microduct routes in occupied ducts. Easy to replace old cables through the network. Possibility to migrate from copper balanced cables to fibre optic cables. Practice Today the microduct cabling technology is used more and more, all over the world. The fibre counts have grown up to 144 per cable and can be installed in microducts of only 8 mm inner diameter. Bundles of microducts can be jetted over 1500 m or more. Microduct cables can even be jetted over 3.5 km in one single shot. More length without splice is reached by placing jetting equipment in tandem. Notes References Griffioen, W., "Installation of optical cables in ducts", Plumettaz, PTT Research 1993 () Griffioen, W., Nijstad, H., Grooten, A.T.M., Van Wingerden, A., Brown, G., Hawkins, D.F., Plumettaz, G., "A new, extremely versatile, access network cabling concept for migration to optical fiber", Proc. 45th IWCS, November 1996, page 485-489 Griffioen, W., Nijstad, H., Grooten, A.T.M., Van Wingerden, A., Brown, G., Hawkins, D.F., Plumettaz, G., "A copper-in-tube access network, easy to migrate to optical fibre", Proc. EC'97 June 1997, page 20-24 Griffioen, W., Nijstad, H., Grooten, A.T.M., Van Wingerden, A., Brown, G., Hawkins, D.F., Plumettaz, G., "JETnet: versatile access network solutions" Proc. ANCIT Workshop (Eurescom), Torino, 30-31 March 1998 Griffioen, W., De Oliveira, J., "Metronet - Uma Versátil Rede Óptica de Acesso", Proc. I SIMCRO, Campinas, Brazil (1999) Griffioen, W., Van Wingerden, A., Van 't Hul, C., "Versatile outside plant solution for optical access networks", Proc. 48th IWCS, November 1999, page 152-156 Griffioen, W., Van Wingerden, A., Van 't Hul, C., "Versatile optical access network for business and future consumer market, Proc. EC'99, June 1999, page 69-75 Griffioen, W., Van Wingerden, A., Van ’t Hul, C., “Univerzální optická přístupová síť pro komerční a