Allied Telesis AT-MCF112VF, SM, LH - Manual (Page 16)

Overview
8
Duplex Mode DIP Switches
The AT-MCF106xx and AT-MCF112xx Series Multichannel Media Converters
include DIP switches (Figure 1) on the front panel for controlling the duplex
mode of the individual media converter channels. You use the DIP switches to
set each channel to either half- or full-duplex operation. The AT-MCF106xx
Series Multichannel Media Converter has one set of DIP switches while the
AT-MCF112xx Series has two sets of switches. Each DIP switch must be et to
reflect the duplex node of the two end nodes connected to the ports of the
corresponding channel.
Figure 6 Duplex Mode DIP Switches
The duplex mode refers to the manner in which a node sends and receives
data on the network. Depending on its capabilities, a node can operate in
either half-duplex mode or full-duplex mode. A node that is operating in half-
duplex mode can either send data or receive data, but not both at the same
time. A node that is operating in full-duplex mode can send and receive data
simultaneously. Naturally, the best network performance is achieved when a
node can operate at full-duplex, since the node is able to both send and receive
data at the same time.
The two nodes that are connected to the same twisted pair and fiber optic
ports of a channel on the media converter must operate with the same duplex
mode, otherwise the duplex mode mismatch can occur. For example, assume
that you connected a node operating at half-duplex to the twisted pair port of a
channel on the media converter and a node operating at full-duplex to the
fiber optic port of the same channel. This would be an invalid configuration
and could adversely affect the performance of the network. Either the node
connected to the twisted pair port would have to be changed to full-duplex (if it
supports that capability), or the node connected to the fiber optic port would
need to be changed to half-duplex.
The DIP switch labeled NORM / TEST is used to activate the MissingLink
feature on the unit and to perform a link test on the ports of the media
converter.
MCF112SC 100Base-TX/FX Media Converter
Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx
7 8 9 10 11 12
Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx
T-LNK F-LNK
Active
1 2 3 4 5 6
RESET
NORM
TEST
1 2 3 4 5 6
FDX
HDX
NORM
TEST
FDX
HDX
7 8 9 10 11 12
P O W E R
BCKP MAIN
MANAGEMENT
10Base-T
TEST 7-12 RS232
TEST 1-6
X II
LNK REC
Ready RESET
NORM
TEST
1 2 3 4 5 6 FDX
HDX
NORM
TEST
FDX
HDX 7 8 9 10 11 12