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Theory of Operation
Contents
Front Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Cascading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fiber-Optic Cable and Connector Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Operational Software Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Basic Operation
The default factory configuration for the VMIACC-5595 is to automatically bypass
ports due to the loss of a signal (light) at the receiver or the absence of a valid
synchronization pattern, without any interface through the Ethernet port or RS232
port.
Three LEDs adjacent to each port give a visual indication of the port status. Status
information and modes of operation are available using the Ethernet port and your
standard Web Browser or using the RS232 port and any RS232 terminal interface.
Status information includes:
• Detection of installed transceivers
• Detection of signal (light)
• Detection of valid synchronization patterns (multiple or single)
The Hub Assembly allows for the bypassing of a port to be based on the absence of
either single/multiple synchronization patterns or the loss of a signal (light). Also,
each port can be manually forced active or bypassed regardless of the status
indicators. Finally, each port transmitter can individually be disabled without
shutting down the entire Hub.
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