User guide

Metrobility “redundant twister” 11
Set the MDI-II/MDI-X Switches
(2711-11 only)
Next to each RJ-45 connector is a small push button switch used to imple-
ment the transmit and receive crossover functionality for that particular port.
The position of this switch connects the transmit and receive signal pairs in
either a straight through or crossover configuration. The signal routing is as
follows:
TM
MAIN PWR
AT
LK
A
B
PRIMARY
AT
LK
SECONDARY10BASE-T
AT
RESET
LKSW
“redundant twister” 2711
X
II
X
II
X
II
PRIMARY
AT
LK
X
II
Switch Position Connection
TX+ to TX+
TX- to TX-
RX+ to RX+
RX- to RX-
TX+ to RX+
TX- to RX-
RX+ to TX+
RX- to TX-
When setting the MDI-II/MDI-X switch, simply press the push button IN
or OUT to achieve the desired setting. Observe the positioning of the push
button in relation to these symbols:
• The parallel symbol (II) indicates a straight through or parallel
connection. Press the button OUT for a straight through connection.
• The cross symbol (X) indicates a crossover connection. Press the
button IN for a crossover connection.
These two symbols are clearly marked on the front panel in conjunction
with each switch. Refer to the illustration below: