Optilab’s BERT is a cost effective bit error rate tester system. When used as a ParBERT, it outputs 16 channels data pattern, and also acts as the 16 channel error analyzer. The user selectable reference clock allows testing BER at a specific data rate with external clock input or at a pre-defined data rate using the internal clock. Each channel supports data rate up to 3 Gbps. Moreover, a SFI-5 compliant deskew channel provides parallel alignment information between channels. The error detector checks error rate in each data lane and detect channel parallel misalignment up to 15 UI.