Type 991-IIB Youzhong Class (Small Cable Layer)
A smaller version of 'Youdian' class, at least three (G2693, N2303, N2404) and possibly more were in service by the year 2000. They have a shallower draft and only 50 cubic meters of cable stowage. Zhonghua SY, Shanghai built them beginning in 1982. G2693 was built in 1982.
James C. Bussert noted the three 750-ton Youzhong ARC ships were " ... assigned to the Maritime Border Defense Force (MBDF). The G2693 ARC ship was attached to the South MBDF, and N2304 and N2404 were attached to the Eastern MBDF. This could point to development and deployment of harbor defense active/passive sonar sensors or littoral magnetic loops to detect intruding submarines in the mid-1980s. These would fall within the mission of border defense."