Westermo ODW-720-F2 - Manual (Page 28)

28 6651-2235
If an optical fibre segment fails, the ODW-720 Ring Focal Points will switch mode and
start sending out data on both optical fibre ports, TX1 and TX2, simultaneously.
The third and fourth ODW-720 units will now switch direction so that data is sent out
on optical fibre TX1 instead of TX2. (Not shown in the picture above, is that the third
ODW will continue to send data out on TX2).
Consequently, communications device 1 is still able to communicate with device 3 and 4.
And communications device 2 is still able to communicate with device 5.
RX2
TX2
Device 1
Sending data to
device 3 and 4 on the
primary channel
Device 2
Sending data to
device 5 on the
secondary channel
Device 3
Receiving data from
device 1 on the
primary channel
Device 5
Receiving data from
device 2 on the
secondary channel
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
RS-232 RS-232 RS-232
Fibre
pair
Fibre
pair
Fibre
pair
RS-232
TX1
RX1
RX2
TX2
TX1
RX1
Device 4
Receiving data from
device 1 on the
primary channel
RS-232
RX2
TX2
TX1
RX1
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
Faulty
segment
Primary channel
Focal point
Secondary channel
Focal point
RX2
TX2
Device 1
Receiving data from
device 4 on the
primary channel
Device 2
Receiving data from
device 5 on the
secondary channel
Device 3
Not sending or
receiving any data
Device 5
Sending data to
device 2 on the
secondary channel
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
RS-232 RS-232 RS-232
Fibre
pair
Fibre
pair
Fibre
pair
RS-232
TX1
RX1
RX2
TX2
TX1
RX1
Device 4
Sending data to
device 1 on the
primary channel
RS-232
RX2
TX2
TX1
RX1
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
Faulty
segment
Primary channel
Focal point
Secondary channel
Focal point