User`s guide

Installation Guide 7
DIP Switches
The AutoTwister provides a set of six DIP switches located on the back
panel. These switches allow you to select from several modes of
operation. The default settings are shown below.
Default
DIP Switch
Settings
O
I
LLCF LLR2 FD2
100M1
AN1
FD1
O = OFF
I = ON
Link Loss Carry Forward Switch (LLCF)
The AutoTwister incorporates Link Loss Carry Forward (LLCF) functional-
ity as an aid in troubleshooting remote connections. When LLCF is
enabled, the loss of inbound link pulses on a port stops the transmission
of outbound link pulses on the opposite port. For example, if LLCF is
enabled, the loss of incoming link pulses at Port 1 will stop the transmis-
sion of link pulses out of Port 2 . Conversely, if Port 2 stops receiving link
pulses, Port 1 will not transmit link pulses.
Link Loss Carry Forward is enabled on both ports when switch LLCF is
ON. The unit is shipped with LLCF disabled. Refer to Link Loss Carry
Forward in the User Guide section of this manual for further details.
Link Loss Return Switch (LLR2)
In addition to LLCF, the AutoTwister supports Link Loss Return function-
ality to help with troubleshooting remote connections.
Unlike LLCF, which applies to both ports on the AutoTwister, LLR only
affects the fiber optic port. When LLR is enabled, the loss of the inbound
link pulses on the port stops the transmission of outbound link pulses on
the same port. For example, if LLR is enabled on port 2 and its receiver
(RX) stops detecting link pulses, then port 2’s transmitter (TX) will stop
sending link pulses. LLR is not applicable to the copper port.
Link Loss Return is enabled on Port 2 when switch LLR2 is ON. The unit
is shipped with LLR disabled. Refer to Link Loss Return in the User
Guide section of this manual for more information.
Duplex Switch (FD1, FD2)
*
Switch FD1 determines the duplex mode for the copper port when auto-
negotiation is disabled. When auto-negotiation is enabled, the FD1
switch setting is ignored. Switch FD2 determines the duplex mode on the
*Changes to switches FD1 and FD2 only come into effect after the power-cycle initialization.