Understand the SONET Frame Checksum
The SONET frame checksum is a calculation that is added to a frame for error control purposes. SONET frame checksum is used in High-level Data Link Control (HDLC), Frame Relay, and other data-link layer protocols. For example, Router A calculates the frame check sequence (FCS) and adds it to the outgoing message. Router B, on receiving the message recalculates the FCS and compares it to the FCS from Router A. If there is a difference, both sides of the connection might not match in relation to the FCS configuration.
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