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Westermo ODW-730-F2 User Manual

Page 23

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23

6651-2255

Data transport in redundant ring, dual channel, Y-mode configuration

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

Sending data to
device 3 on the
primary channel

RS-485

Device 2

Sending data to
device 4 on the

secondary channel

RS-485

Device 3

Receiving data from

device 1 on the
primary channel

RS-485

Device 4

Receiving data from

device 2 on the

secondary channel

RS-485

PWR

FP

TD

RD

PWR

FP

TD

RD

PWR

FP

TD

RD

PWR

FP

TD

RD

The first ODW-730 unit recieives data from communications device 1 on the RS-485
port and sends it out on optical fibre TX1 using the primary data channel.
The second ODW-730 unit receives primary channel data on optical fibre RX2. Primary
channel data is repeated out on optical fibre TX1. The second ODW-730 unit also
receives data from communications device 2 on the RS-485 port. The RS-485 data is sent
out on optical fibre TX1 using the secondary data channel.
The third ODW-730 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-485 port.
The fourth ODW-730 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 secondary channel data is sent out on the RS-485 port.