Dual-fibre multimode GPI and data transceiver card with LC connectors RP for relay GPI closed = GPO open  The BC720 is a transceiver card allowing transmission and reception of 4 independent GPIO signals plus 4 RS232 or RS422/485 level signals via fibre optic cable using two independent wavelengths. The 4 GPIO input signals are TTL level inputs with the 4 GPIO outputs provided via an isolated relay contact.  The BC720 also operates in mixed mode allowing RS232 to RS422/485 links, eliminating the need for external mode converters.  All Bluebell cards are designed to maintain maximum signal path integrity offering excellent jitter-free optical transport.  The BC720 is available in multimode and single-mode versions to suit any fibre application.  The BC720 occupies a single slot in the 19" rack-mount BC100-3RU chassis which can accommodate up to 15 single cards. This dual functionality allows transmission or reception of up to 30 video channels from a single 3RU chassis. Signal and card monitoring is carried out via SNMP monitoring in the BM101 network card. Alternatively, GP output alarms can be triggered via the BM100 module.  For standalone applications, the BC720 can be housed in a robust individual enclosure.   specifications