Westermo ODW-720-F2 - Manual (Page 18)

18 6651-2235
If an optical fibre segment fails, the ODW-720 Ring Focal Point will switch mode and
start sending out data on both optical fibre ports, TX1 and TX2, simultaneously.
RX2
TX2
Device 1
Sending
Device 2
Receiving
Device 3
Reciving
Device n
Receiving
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
RS-232 RS-232 RS-232
Fibre
pair
Faulty
segment
Fibre
pair
Focal point
RS-232
TX1
RX1
RX2
TX2
TX1
RX1
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
ODW-720 units located to the “right” side of the failure will send data in the opposite
direction as before. Notice that still, it’s only the first ODW-720 that is able to commu-
nicate in full duplex with other units, and that other units are incable of communicating
with each other.
RX2
TX2
Device 1
Receiving
Device 2
Not sending or
receiving any data
Device 3
Sending
Device n
Not sending or
receiving any data
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
RS-232 RS-232 RS-232
Fibre
pair
Faulty
segment
Fibre
pair
Focal point
RS-232
TX1
RX1
RX2
TX2
TX1
RX1
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD