The indoor micro-tube breakout optical cable uses micro-tube (made of optical fibres and special material) as optical sub-units. Sub-units are housed in the LSZH sheath with a special cross section. Two FRPs are placed in parallel as the strength member. An external mark of the sheath indicates the direction of opening.The indoor micro-tube breakout optical cable uses micro-tube (made of optical fibres and special material) as optical sub-units. Sub-units are housed in the LSZH sheath with a special cross section. Two FRPs are placed in parallel as the strength member. An external mark of the sheath indicates the direction of opening.