Communication system

A communication system comprising a first terminal, a second terminal, a first manage module connected to the first terminal, a second manage module connected to the second terminal and connected to the first manage module via an Internet protocol (IP) network, and a clock supply module connected to the first manage module and the second manage module,

• wherein
• the clock supply module transmits a synchronize signal to the first manage module and the second manage module,
• the first manage module comprises:
• a first circuit for converting a signal to be transmitted to the first terminal and a signal received from the first terminal;
• a first convert module for receiving a signal transmitted from the first circuit, and converting time division multiplexed (TDM) data to IP packets and vice versa;
• and
• a second convert module for receiving a signal transmitted from the first circuit, and converting TDM data to IP packets and vice versa, and
• the first convert module and the second convert module synchronize IP packet processing by using the synchronize signal supplied from the clock supply module.