black box SM973A  切换器
型号：SM973A

产品描述：Pro Switching System Plus 120-VAC Power A/B Switch Card,
 Processor/Network Reporting, 2-In/1-Out     

Product Highlights
Provides A/B switching.
Enables you to power a backup network and set up redundant backup 
power supply.
Additional circuitry detects AC power and a processor makes that 
information  an SNMP monitoring station.