ProHD BR-EN900 HEVC Encoding and Streaming ApplianceUser Manual, Version 2.2 45Overhead in data rate, added by 1D-FEC, can be calculated by following formula:• FEC Mode: Select the Forward Error Correction dimension mode: 1-D (only the columnchecksums will be sent to the destination), or 2-D (checksums of both columns and rows willbe sent to the destination).• Matrix Dimension: The specified FEC rows and FEC Columns from which row checksums andcolumn checksums will be generated (FEC algorithm = XOR). Displays the columns/rowsmultiplying value of the column/rows. Matrix size value must be less than 100.• Columns/Rows: Select the desired values for the selected FEC. For the column, value canrange from 1 to 20.• 1-D Port Number: Enter the port number from through columns checksums will be sent.• 2-D Port Number: Enter the port number from through rows checksums will be sent when 2-D mode is selected.The network bandwidth overhead for Pro-MPEG technology is fixed, and is determined by the XOR matrix dimensionsand size selected values. Bandwidth overhead exists regardless of whether the network link has errors or not.