Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guida Alla Risoluzione Dei Problemi

Introduction
 Prerequisites
      Requirements
      Components Used
      Conventions
 Cyclic Redundancy Check
 CRC−16 and CRC−32
 Configure the CRC Length
 Related Information

This document discusses the two Cyclic Redundancy Check (CRC) options on Packet Over Synchronous
Optical Network (POS) router interfaces.

There are no specific requirements for this document.

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment. All of the
devices used in this document started with a cleared (default) configuration. If your network is live, make sure
that you understand the potential impact of any command.

Refer to Cisco Technical Tips Conventions for more information on document conventions.

The CRC is a technique used to check errors. The CRC uses a calculated numeric value to detect errors in
transmitted data. The sender of a data frame calculates the Frame Check Sequence (FCS). The sender appends
the FCS value to outgoing messages. The receiver recalculates the FCS, and compares the value with the FCS
from the sender. 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 retention of the true value of a frame is important to ensure
that the destination correctly interprets the data that you communicate.