Dear friend!
The MSTP network is mainly used to transmit SDH services (including PDH services), Ethernet, ATM, PCM, storage, and video services. It is applicable to enterprise networks, small-scale broadcast and television networks, and 2G mobile communications networks.
The packet network mainly transmits Ethernet services of different rates and some low-rate SDH services. Packet networks are mainly used in 2G and 3G mobile communication networks.
A pure SDH network can only transmit SDH and PDH services and is applicable only to simple and temporary communication scenarios. Currently, the SDH network is basically out of the market.
Thank you!