High accuracy to 1us,Unique Card configuration,Multiple time ... 7 cards, they are Dry output, TTL output, 485/422 output, serial output, IRIG-B AC output, ... (TTL output and 422/485 output),AC outputDCF77 output:Dry outputSerial output:RS232 and RS422/485.Ethernet outputMaster/Slave: As master ... card.Environmental: Operating Temperature 0°C to +50°CStorage Temperature -40°C to +50°CDimension:19'', 2U