Westermo ODW-720-F2 - Manual (Page 8)

8 6651-2235
Data transport in multidrop, dual channel, Y-mode configuration
RX2
TX2
Device 1
Sending data to
device 3 on the
primary channel
Device 2
Sending data to
device 4 on the
secondary channel
Device 3
Receiving data from
device 1 on the
primary channel
Device 4
Receiving data from
device 4 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
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
PWR
FP
TD
RD
The first ODW-720 unit recieives data from communications device 1 on the RS-232
port and sends it out on optical fibre TX1 using the primary data channel.
The second ODW-720 unit receives primary channel data on optical fibre RX2. Primary
channel data is repeated out on optical fibre TX1. The second ODW-720 unit also
receives data from communications device 2 on the RS-232 port. The RS-232 data is sent
out on both optical fibres TX1 and TX2 using the secondary data channel.
The third ODW-720 unit receives both primary and secondary channel data on optical
fibre RX2. Both primary and secondary data are repeated out on optical fibre TX1, but
only the primary channel data is sent out on the RS-232 port.
The fourth ODW-720 unit receives both primary and secondary channel data on optical
fibre RX2, but only the secondary channel data is sent out on the RS-232 port.
RX2
TX2
Device 1
Receiving data from
device 3 on the
primary channel
Device 2
Receiving data from
device 4 on the
secondary channel
Device 3
Sending data to
device 1 on the
primary channel
Device 4
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
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 optical fibre TX2 using the secondary data channel.
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. Both primary and secondary data are repeated out on optical fibre TX2, but
only the secondary channel data is sent out on the RS-232 port.
The first ODW-720 unit receives both primary and secondary channel data on optical
fibre RX1, but only the primary channel data is sent out on the RS-232 port.