Data transmission between networks with different protocols - having first frame with data fields and integrity check field for data fields, and converting bit by bit to second field

摘要

The data transmission method involves sending data via an interface (10) from a first network (1), using a first protocol e.g. Ethernet and connected to receiving equipment (20, 32) across a second network (40) using a second protocol e.g. high data link control (HDLC). The protocol date is converted bit by bit between the two networks. The receiving equipment may include a second interface (20) for converting back to the first protocol for reception at the first network receiving equipment (32). The interface converter has a buffer memory, which is written to and read from at different rates according to the protocols. For Ethernet and HDLC protocols, a decoder receives fields according to Manchester codes, and transmits to the converter according to no return to zero (NRZ) codes. USE/ADVANTAGE - Interconnection of local networks. Simpler converter. Second network receiver can demand retransmission of data from partic. transmitter if fault is detected.