A system requires at least one set of master modules. The DATA modules operate in
slave mode only, and therefore require a minimum of one set of master I/O modules to form
a functional transmission system. Master modules are those which contain the
high-speed multiplexers and fiber-optic transmitters and receivers. Slave modules
take their timing and clock information from master modules, and are not functional unless
slaved to a set of master modules. This is accomplished via a rear panel DB
connector and an external linking cable. This allows the transfer of internal
clocks, digital data and synchronization signals between a master module and up to five
slave modules of any type within the Fibox series.
Fibox modules which can act as masters for the DATA I/O modules are the FBAI-M and
FBAO-M set of analog I/O modules, the FBDO-M AES digital audio output module, and the
IMS-Tx and IMS-Rx set of high-speed digital I/O modules. For bi-directional signal
capability, two transmission systems must be operational, each transmitting in opposite
directions. This requires a minimum of two fibers, one for each direction of signal
transmission. An interlink cable between the DATA I/O modules at each end of the
system re-creates the bi-directional signal path for the RS232 and RS485 signals.
