Back-to-back topology, Figure 5. back-to-back topology – Allied Telesis AT-PC232/POE User Manual
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Chapter 1: Overview
32
Back-to-Back
Topology
In some network configurations you may want to interconnect two AT-
PC232/POE Media Converters in what is referred to as a back-to-back
topology. In this topology, the AT-PC232/POE Media Converters not only
extend the distance of your network but also converts the fiber optic cable
from twisted pair to fiber optic and back again. Figure 5 illustrates one
AT-9424T switch at campus 1 and one AT-WA7400 Wireless Access
Point on campus 2. The switch and access point are interconnected by
two AT-PC232/POE Media Converters which provide a connection of up
to 2 kilometers (1.24 miles). The 10/100Base-TX twisted pair ports on the
AT-PC232/POE Media Converters are connected to the SC ports on the
switches, while the 100Base-FX ports on the two AT-PC232/POE Media
Converters are directly connected to each other.
Note
When using two AT-PC232/POE Media Converters back-to-back,
you must set both AT-PC232/POE Media Converters to the same
mode. For example, the first AT-PC232/POE Media Converter is set
to Smart MissingLink mode, so the second media converter must
also be set to Smart MissingLink mode.
Figure 5. Back-to-Back Topology
1377
5V,2.8A
RESET TO DEFAULT
LAN
1
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15
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19
21R
23R
2
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22R
24R
CLASS 1
LASER PRODUCT
AT-9424T
1
3
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21R 23R
2
4
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22R 24R
TERMINAL
PORT
FAULT
MASTER
POWER
STATUS
SFP
21
22
23
24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX / COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
21
22
23
24
SFP
L/A
Gigabit Ethernet Switch
Campus 2: AT-WA7400 AP
AT-PC232/POE
Campus 1: AT-9424T
AT-PC232/POE
Multi-mode
Fiber Optic
Twisted Pair
2km (1.2 mi)
100 m (328 ft)
maximum
maxiimum