"Regarding the FCS length, with one exception, the 32-bit FCS must be used for all SONET/SDH rates. Here is how this RFC specifies when a POS interface can use the 16-bit CRC (CRC-16) and when it can use the 32-bit CRC (CRC-32): Request for Comments (RFC) 2615 defines the use of the Point-to-Point Protocol (PPP) over SONET/ Synchronous Digital Hierarchy (SDH). The retention of the true value of a frame is important to ensure that the destination correctly interprets the data that you communicate.
If a difference exists, the receiver assumes that a transmission error occurred, and sends a request to the sender to re-send the frame. The receiver recalculates the FCS, and compares the value with the FCS from the sender. The sender appends the FCS value to outgoing messages. The sender of a data frame calculates the Frame Check Sequence (FCS). The CRC uses a calculated numeric value to detect errors in transmitted data. The CRC is a technique used to check errors. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment.
#A ppp frame include a fcs which is a crc software#
This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. This document discusses the two Cyclic Redundancy Check (CRC) options on Packet Over Synchronous Optical Network (POS) router interfaces.
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