Aiming at the problem that the number of single disks of traditional Optical Transport Network (OTN)equipment business is too small, and the expansion of the slot will cause business interruption and high cost, this paper proposes a Cluster Architecture of Optical Transport Network (COTN) communication equipment. The design of the COTN equipment management system is an effective technical guarantee to upgrade existing network equipment from OTN to COTN, which is the only technical means to ensure the compatibility and scalability of the single-disk service bearer in COTN. Therefore, this paper adopts a single network element and multiple sub-frames. A comparative study of COTN equipment and traditional OTN equipment in the areas of data collection, inter-frame protection, and service processing show that the expansion of COTN equipment service slots meets the low-cost and dynamic sustainability requirements of bearer service expansion.