What are the disadvantages of pdh communication?

PDH (Plesiochronous Digital Hierarchy) communication has several disadvantages, including its complexity in synchronization, which can lead to difficulties in maintaining data integrity. Additionally, PDH systems are less flexible compared to newer technologies like SDH (Synchronous Digital Hierarchy), making upgrades and integrations with modern networks challenging. The limited bandwidth options and the inability to efficiently handle data traffic also hinder its performance in high-demand scenariOS. Lastly, troubleshooting and maintenance can be cumbersome due to the proprietary nature of many PDH systems.