PLANET ADE-3100 - Manual (Page 23)

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MRU: The MRU (Maximum Receive Unit) field indicates the maximum size IP packet that
the peer of PPP connection (this device) can receive. During the PPP negotiation, the
peer of the PPP connection will indicate its MRU and will accept any value up to that size.
Range: 0-32767 Default: 1492
MTU: Maximum Transmission Unit (MTU) is the largest size packet that can be sent by
the modem. If the network stack of any packet is larger than the MTU value, then the
packet will be fragmented before the transmission. During the PPP negotiation, the peer
of the PPP connection will indicate its MRU and will accept any value up to that size.
Range: 0-32767 Default: 1492
MSS: Maximum Segment Size is the largest size of data that TCP will send in a single,
unfragmented IP packet. The LAN client and the WAN host will indicate their MSS during
the TCP connection handshake.
Range: 0-32767 Default: 1432
Lcp Echo Interval: It is the time interval, in seconds, between PPP session connection
attempts.