Westermo LR-01 - Manual (Page 9)

9 6608-2201
3.1 Point to point topology
With only two network segments, the most cost effective solution is to use two point to
point (LR-01PP) units to create a fibre optic connection.
The user could however still choose not to use the point to point units and have the
additional link unconnected. In this way the user have the possibility to easily add more
units and network segments at a later time.
The point to point connection provides a totally transparent fibre link which means that
all data received on one units TP port will be forwarded unchanged to the other port, as
illustrated in figure 3.3. This could be regarded as Two-Way physical repeater link.
3.2 Bus topology
The normal mode for communication is a transparent mode referred to as Y-mode.
The data flow in Y-mode is schematically illustrated in figure 3.4.
When data is received from a TP network, the corresponding LR-01 unit will transmit
the data onto both F/O links. All data received by an LR-01 unit on either Rx1 or Rx2 is
transmitted over to the corresponding TP network as well as forwarded by the opposite
transmitter, Tx2 or Tx1. The units used at the endpoints does not need to forward data
on both fibre links, and thus only one fibre link is required (PP version).
Y-mode provides totally transparent communication. All L
ON
W
ORKS
® nodes will be able
to send and receive data to and from all TP segments. This could be regarded as N-Way
physical repeater link.
Figure 3.3. Point to point communication
Figure 3.4. Transparent Y-mode
TP Network
LR-01PP
TP Network
LR-01PP
Rx Tx Rx Tx
N1 N2 L N
LR-01
LONWORKS TP/FT-10 POWER
Rx1
Rx2
Tx1
Tx2
TD RD C E PWR
OPTO LINK MONITOR CH1 C E CH2
N1 N2 L N
LR-01
LONWORKS TP/FT-10 POWER
Rx1
Rx2
Tx1
Tx2
TD RD C E PWR
OPTO LINK MONITOR CH1 C E CH2
LR-01 LR-01PP
Rx Tx1 Rx2 Tx1
LR-01
Rx2
Tx1 Rx1 Tx2 Rx1 Tx2
TP Network TP Network TP Network
N1 N2 L N
LR-01
LONWORKS TP/FT-10 POWER
Rx1
Rx2
Tx1
Tx2
TD RD C E PWR
OPTO LINK MONITOR
CH1 C E CH2
N1 N2 L N
LR-01
LONWORKS TP/FT-10 POWER
Rx1
Rx2
Tx1
Tx2
TD RD C E PWR
OPTO LINK MONITOR
CH1 C E CH2
N1 N2 L N
LR-01
LONWORKS TP/FT-10 POWER
Rx1
Rx2
Tx1
Tx2
TD RD C E PWR
OPTO LINK MONITOR
CH1 C E CH2