Westermo ODW-720-F2 - Manual (Page 22)

22 6651-2235
RX2
TX2
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
Fibre
pair
Fibre
pair
Fibre
pair
TX1
RX1
RX2
TX2
TX1
RX1
Primary channel
Focal point
Scondary channel
Focal point
Device 1
Receiving data from
device 3 on the
primary channel
RS-232
Device 2
Receiving data from
device 4 on the
secondary channel
RS-232
Device 3
Sending data to
device 1 on the
primary channel
RS-232
Device 4
Sending data to
device 2 on the
secondary channel
RS-232
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
The fourth ODW-720 unit recieives data from communications device 4 on the RS-232
port and sends it out on both optical fibres TX1 and TX2 using the secondary data chan-
nel.
The third ODW-720 unit receives secondary channel data on optical fibre RX1.
Secondary channel data is repeated out on optical fibre TX2. The third ODW-720 unit
also receives data from communications device 3 on the RS-232 port. The RS-232 data is
sent out on both optical fibres TX1 and TX2 using the primary data channel.
The second ODW-720 unit receives both primary and secondary channel data on optical
fibre RX1. Only the primary channel data is repeated out on optical fibre TX2, and only
the secondary channel data is sent out on the RS-232 port.
The first ODW-720 unit receives primary channel data on optical fibre RX1, and this data
is sent out on the RS-232 port.
Notice that the Ring Focal Points never repeat data coming in from optical fibre RX2.
RX2
TX2
TX1
RX1
RX2
TX2
TX1
RX1
RX2
TX2
Fibre
pair
Faulty
segment
Fibre
pair
TX1
RX1
RX2
TX2
TX1
RX1
Primary channel
Focal point
Scondary channel
Focal point
Device 1
Sending data to
device 3 on the
primary channel
RS-232
Device 2
Sending data to
device 4 on the
secondary channel
RS-232
Device 3
Receiving data from
device 1 on the
primary channel
RS-232
Device 4
Receiving data from
device 2 on the
secondary channel
RS-232
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
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.