1.1. Basic concepts and objectives of the control system
The purpose of the SDH network, like any communication network, is to serve consumers, or customers, for example, by telephone. At the same time, not only services should be provided to subscribers, but also the quality of communication should be ensured, i.e., timely and accurate message transmission should be guaranteed, the required connections and signaling should be made, protection from losses and interruptions during the communication session should be provided, etc.