The OS-4121 is an optical path protection switch,
providing a self healing network. This optic switch detects loss of
optical power in the primary optical path and automatically switches to the
secondary (backup) path. When the primary link is restored, the
network path is restored to the primary path. The optical
protection switch can be controlled via three methods; front panel manual
switch, remote control signal, or the automatic internal monitoring
The optical path through the units is purely optical.
There is no optical to electrical to optical conversion therefore there
is no electrical loss or electrical bandwidth limit on the fiber optic path.
For applications where two independent optical channels need to be switched
the OS-4221 is two OS-4121 switches in a single package.
< 10 ms
Switching time <10ms
< -50 dB
Fail-safe return to primary with loss of power
< 2.5 dB
DIN or Rack
Mountable (same unit)
< -50 dB
· Multimode &
Optical Input (maximum)
+26 dBm (400nw)
& Power Indicators
Switch Life cycle
> 1 Million cycles
Selectable from -20 to -38 dBm
Sensitivity Data Rate
DC to 3 Gb/s
850/1310, or 1310/1550nm
FC/PC, or SC/PC
11-24 VAC/DC @150mA
0 to +70 °C
MTBF (per MIL HBK
Physical Size (mm)
5.0" x 7.0" x 1.0"
127mm x 178mm x 25.4mm
Note all specifications are subject to change without notice
* -48VDC models available by request.
Ordering Information; OS-4121-X where "X" =