Visara 410 - Manual (Page 24)

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Chapter 3: Starting Visara the First Time
Advanced Ethernet Settings
The Maximum Transmission Unit (MTU) setting specifies the maximum
size of a frame that can be transmitted by TCP/IP over Ethernet. The
default is Normal (1514 Bytes). The Reduced setting (576 Bytes) would
be used if a host or router on the WAN required the lower setting
(example: x.25)