The protocol converter is also a gateway, which enables hosts that use different high-level protocols on the communication network to still cooperate with each other to complete various distributed applications. It works at the transport layer or higher. The interface protocol converter can generally be completed with an ASIC chip, which has low cost and small size. It can convert between IEEE802.3 protocol Ethernet or V.35 data interface and 2G interface of standard G.703 protocol.
It converts Ethernet signals or V.35 signals to E1 signals for long-distance transmission over synchronous/quasi-synchronous digital networks in the form of E1 signals. The main purpose is to extend the transmission distance between the Ethernet signal and the V.35 signal. It is a network access device.
Protocol gateways usually perform protocol conversions between network areas that use different protocols. This conversion process can occur between Layer 2, Layer 3, or Layer 2 or Layer 3 of the OSI Reference Model. However, there are two protocol gateways that do not provide the ability to convert: security gateways and pipes. Due to the logical differences between the two interconnected network areas, the security gateway is an essential intermediary between two technically similar network areas. Such as private wide-area networks and the public Internet. This special case is discussed in the subsequent "Combined Filtering Gateway". This section focuses on the protocol gateway that implements physical protocol conversion.
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