The 4-core fiber termination box provides a stable, protective joint between optical cable and distribution pigtails at the end of fiber cables. It is typically used in cabling work area subsystems. 0mm fiber cable and splice up to 4. FBR CABLES designs and manufactures high-performance fibre optic cables in Morocco for operators, integrators and FTTH projects. Backed by advanced production capabilities, we deliver certified quality, controlled lead times and local technical support. VTB20 covers the capacity of 1core, 4cores and 8 cores and supports splicing, mechanical connection and FMC, wall mounted installation Standards ABS material used ensures. YOTB-4A Metal Optical Terminal Box, also known as OTB, is made of cold-rolled steel.