Refer to figure, Port, Installing the switch 18 – Allied Telesis AT-FS203 User Manual

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Installing the Switch

When setting the DIP switches, consider the following:

❑

The default setting of 1518 bytes for the maximum packet size is the
upper limit of the allowable Ethernet packet size as specified in the
IEEE 802.3 standard. At this setting, any packets over this size will
be considered illegal and will be dropped as part of the switch’s error-
handling operations.

❑

Changing the setting of the maximum packet size to 1522 causes the
switch to function as a passive component of the network in
accordance with the IEEE 802.1Q VLAN tagging standard. The switch
will pass packets that adhere to the standard. This 1522 setting
should be used only in a network that uses the IEEE 802.1 Q VLAN
tagging standard.

❑

For a twisted pair port(s), setting the AUTO NEG switch to either ON
or OFF either enables or disables auto-negotiation on the port. If you
disable auto-negotiation, be sure to set the DIP switches for the port’s
speed and duplex mode to match the speed and duplex mode of the
end-node.

❑

For a fiber optic port, set the port’s duplex mode using the appropriate
DUPLEX MODE DIP switch. This setting must match the duplex
mode capability of the end-node to be connected to the port.

Figure 11 AT-FS203 DIP Switches

12 V D C

1 2 1 2

PORT

10
100

HALF
FULL

OFF
ON

DUPLEX

MODE

AUTO

NEG

SPEED

(Mbps)

1522
1518

BYTES