Inventor
CHIKAZAWA TSUTOMU
JP7 patents
Patents
7 patentsUS5818816AOct 6, 1998
Communication device for switching connection from a working channel line to a protection channel line and vice versa
FUJITSU LTD68 citations94
US6895182B1May 17, 2005
Optical ring transmission system using squelch method
FUJITSU LTD24 citations90
US7408475B2Aug 5, 2008
Power supply monitoring device
FUJITSU LTD11 citations81
US7263062B2Aug 28, 2007
Transmission apparatus with a function to switch a line in the event of a transmission failure
FUJITSU LTD7 citations72
US7778160B2Aug 17, 2010
Device for synchronizing between an active unit and a standby unit
FUJITSU LTD3 citations60
US9690677B2Jun 27, 2017
Transmission device, transmission system, and transmission method
FUJITSU LTD0 citations45
US9602395B2Mar 21, 2017
Apparatus and method for switching communication channels having redundant configuration
FUJITSU LTD0 citations38