User guide

12 Installation Guide
Connect to the Network
A total of three connections must be made on the front panel when
connecting the “redundant twister” media converter to the network.
Connect to the MAIN port.
• Each “redundant twister” provides one RJ-45 jack for 10BASE-T
connections that supports a maximum segment length of 100m Category 3
or 5 twisted-pair; or one RJ-45 jack for 100BASE-TX connections that
support a maximum segment length of 100m of Category 5 twisted-pair.
Connect to the PRIMARY port.
Connect to the SECONDARY port.
• The “redundant twister” 2731-11 (100Mbps) and 2711-11 (10Mbps)
each provide two sets of RJ-45 connectors that support a maximum
cable length of 100m.
• The “redundant twister” 2731-13 and 2731-15 each provide two sets of
100BASE-FX multimode SC/ST connectors that each support a
maximum cable length of 2km.
• The “redundant twister” 2731-14, 2731-17 and 2731-1J provide two
sets of 100BASE-FX singlemode SC connectors. The 2731-14 supports
a maximum cable length of 15km, the 2731-17 supports a maximum
segment length of 40km, and the 2731-1J supports a maximum length
of 100km.
IMPORTANT: 100Mbps RJ-45 ports are wired straight through. Before
making the proper twisted-pair connection, you must verify the port
configuration of the connected device. This does not apply to 10Mbps
models.
4
External Crossover Function
TD+
TD-
RD+
RD-
“redundant twister” 2731
TP Port Configuration
Device with Straight Through
TP Port Configuration
“redundant twister” 2731
TP Port Configuration
Typical Hub
TP Port Configuration
TD+
TD-
RD+
RD-
Embedded Crossover Function
MDI–XMDI
TD+
TD-
RD+
RD-
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6
1
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6
1
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6
1
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6
TD+
TD-
RD+
RD-