Operation
Link Source Alarm (LSA)
CEV / CFOx61/x71 series video modem’s (transmitter and receiver)
contact closure output can be used to control optical switch when the
video modem’s LSA (Link Source Alarm) mode is enabled. When
operating with LSA, a connection cable is required between the optical
switch and video modem.
Note!
Enabling LSA (LSA ON) overrides all other functions of video
modem’s CC output.
When LSA is enabled, video modem’s contact closure input and data 1
connections are normally available via optical switch’s DATA 1 (loopthru)
connector when using a connection cable between CEV / CFOx61/x71
series video modem and optical switch. The recommended connection
cable is Teleste
CIC702
(RJ-45/RJ-45).
LSA commands
CEV / CFO16x/17x series video modem includes a command line
interface (CLI) for con
fi
guration purposes. With help of CLI commands
you can con
fi
gure the LSA settings. See CEV / CFO16x/17x series
video modem’s user manual for more details how to use the CLI.
: Enables/disables LSA monitoring on the device
: Displays or sets the link source alarm switching delay (in seconds).
Delay de
fi
nes how long the device will wait for the optic link to get up
before operating the switch for the
fi
rst time
: Displays or set the link source alarm hold time (in seconds). Holdtime
de
fi
nes the waiting time to ensure the recovery of the optical link
: Resets device source alarm to it’s initial state (see page 4 for
switching logic
fl
ow chart)
Switch port positions and indicator leds
When the switch is not activated (initial state), the com port is connected
to port A, and all front panel RJ-45 connectors leds (1-4) are dark.
When the switch is activated (alarm state), the com port is connected to
port B and all front panel RJ-45 connectors leds (1-4) are green.
The switching can be controlled by the following ways:
• LSA (contact closure output at video modem)
• System power fail (rack power supply)
• External control open (pins open)
• External control closed (pins closed)
• Remote controlled via video modem link
(normal contact closure operation, see note on the right)
Note!
When using LSA control, the optican switch operates
automatically with the logic descripted in page 4.
Port B
Port A
Com
LSA on / off
LSA delay
LSA holdtime
LSA reset
COM port positions
.
The optical switch’s initial state is
always port position A, except when
using system power switching mode,
at that control mode the switch’s
initial state is position B.
2
Optical switch
user manual rev001
