| 摘要 |
Store-and-forward relay equipment in which received data are temporarily stored in a buffer and then transmitted is provided. In the equipment, protection is performed with the limitation of the data part, which is not an object for substitution operation inside the equipment and has an unchanged content. As to the frame received, the part on which no operation is performed inside the equipment is determined, and the CRC for the part concerned is calculated. The obtained CRC is added to a CRC for inside the equipment in the frame. A data error produced inside the equipment is detected for the part on which no operation is performed. A data error produced in the header part of the substitution object in the equipment is not protected by the above CRC for inside the equipment. However, the header part is inspected through the protocol processing.
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