The CS61884 evaluation board is used to demostrate the functions of a CS61884 Octal Line Interface Unit in either E1 75 , E1 120 , or T1/J1 100 applications. The evaluation board can be operated in either Hardware Mode or Host Mode. In Hardware Mode, switches and bed stake headers are used to control the line configuration and channel operations for all eight channels. In Host Mode (Serial or Parallel), the evaluation software, switches, and bed stake headers are used to control the line configuration and operating mode settings for each channel. In both Hardware and Host modes, the board may be configured for E1 75 , E1 120 , or T1/J1 100 operating modes. In both modes binding post connectors provide easy connections between the line interface connections of the CS61884 and any E1/T1 analyzing equipment, which may be used to evaluate the CS61884 device. Bed stake headers allow easy access to each channel's clock and data I/O digital interface. Eight LED indictors display the Loss of Signal (LOS) conditions for each channel during Hardware and Host modes. An LED indictor is used on the Interrupt pin to indicate a change of state.