This International Standard specifies methods for indicating the record and/or reproduction error status of broadcast-grade digital VTRs utilizing a Reed Solomon product error correction code. (This code is hereinafter referred to as RS.) This standard also specifies methods of measuring the error rates in record and/or reproduction modes to indicate the error status. The following two indicators are specified herein: Go/No go indicator (hereinafter GNGI) for operational use. Error rate indicator (hereinafter ERI) for maintenance use. NOTE This standard may be applicable to other digital television equipment using an RS product error correction code.