FiberPlex FOM-1090 - Manual (Page 18)

Switch 2
Switch 2.1: Loop RS and CS locally
This setting creates a loop back for the RS \ CS signals at the local end. The corresponding signal input is still carried
across the link to the remote interface. The signal from the remote end is ignored.
Off Normal RS and CS signal operation
On On FOM‐1090: Loops RS input to CS output. CS signal from remote end is ignored.
On FOM‐1091: Loops CS input to RS output. RS signal from remote end is ignored.
Switch 2.2: Force RS / CS On
Forces the corresponding output ON when unit is in optical sync. This overrides any signal from the far end of the link.
Off Normal RS / CS operation
On Forces RS out ON (FOM‐1091) or CS out ON (FOM‐1090) when unit is in optical sync.
Switch 2.3: Loop TR and DM locally
This setting creates a loop back for the TR / DM signals at the local end. The corresponding signal input is still carried
across the link to the remote interface. The signal from the remote end is ignored.
Off Normal TR and DM signal operation
On On FOM‐1090: Loops TR input to DM output. DM signal from remote end is ignored.
On FOM‐1091: Loops DM input to TR output. TR signal from remote end is ignored.
Switch 2.4: Force TR / DM On
Forces the corresponding output ON when unit is in optical sync. This overrides any signal from the far end of the link.
Off Normal TR / DM operation
On Forces TR out ON (FOM‐1091) or DM out ON (FOM‐1090) when unit is in optical sync.
Switch 2.5: Force RR On (FOM‐1090 only; no function on FOM‐1091)
Forces RR out ON when unit is in optical sync. This overrides RR from the far end of the link.
Off Normal RR operation
On Forces RR out ON (FOM‐1090) when unit is in optical sync.
Switch 2.6: No Function
Switch 2.7: No Line Terminations
This switch removes all line terminations from the interface allowing the FOM to be used as a monitor point on an
electrical link. The unit cannot selectively remove terminations on active lines; either all terminations are present or all
are removed.
Off Standard terminations for selected interface type are present
On Terminations removed (Hi‐Z impedance)
Switch 2.8: Loop Back Test
Loops optic TX to optic RX and loops all copper signals to their corresponding signal (TD‐RD, TT‐RT, RS‐CS, TR‐DM, RL‐
TM, RR On, IC Off, LL Off)
Off Normal operation
On Loop back test