Shared communication channel to clients and peers are provided by Orderer peers.
It offers a broadcast service for messages containing transactions. The channel is used by the clients to broadcast the messages which is then delivered to the peers.
The message is communicated with total-order delivery and reliability. The channel outputs the same messages to all connected peers and outputs then to all peers in a logical order. The ordering service's prime aim is to provide ordering of published transactions and cut blocks with ordered transactions.