2 introduction, Tp/ft network segments fibre optic network, Figure 2.1 up to ten network segments – Westermo LR-01 User Manual
Page 5: Orks
5
6608-2201
2 INTRODUCTION
The LR-01 offers an easy way to extend the distance between L
ON
W
ORKS
®
78 kbit/s
TP/FT network segments using a fibre optic link. The complete transparent conversion
to and from the fibre optic media facilitates the installation procedure by eliminating the
need for any additional network addressing or software configuration.
An LR-01 link acts as a TP/FT-10 physical layer repeater with the following additional
features:
• The channel can be extended to a much longer distances using fibre optic cables
• Up to ten network segments
• Offers immunity against electrical interference
TP/FT Network Segments
Fibre Optic 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
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
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
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
Figure 2.1 Up to ten network segments
The EIA-709.3 specification states a maximum delay of 36 µs and a maximum of one
repeater between any two nodes. Using the LR-01 this delay restriction will normally be
met if the total fibre cable length between the two units is restricted to 5.6 km thus two
LR-01 units form one physical layer repeater. The recommended maximum number of
LR-01’s connected together is ten, however as more units are connected together the
total length of fibre has to be reduced to keep within the delay budget (please see 3.4
channel delay).