The line code violation (CV-L) count is the number of BIP-8 errors which were detected at the SONET line layer interface in a previous 1-day interval. Each line BIP-8 can detect up to eight errors per STS-1 frame, with each error incrementing the CV counter. CVs for the line layer are collected using the BIP-8s in the B2 byte located in the line overhead of STS-1. (Since all CVs on an STS-N line are counted together, this is equivalent to counting each error in the BIP-8N contained in the B2 bytes of the STS-N line overhead.) Thus, on an STS-N signal, up to 8 x N CVs may occure in each STS-N frame.