Configure network interfaces Configure Advanced interfaces settings: External modems and PPP
Digi TransPort WR Routers User Guide 323
PPP Negotiation parameters
When PPP starts up, the devices at both ends of the link negotiate the link parameters, in order to
find a common subset that both devices can use. The negotiation may be summarized by saying
that both ends send negotiation packets with the following message:
these are the values that I wish to use and these are the values that I wish you to use.
Restrict the negotiation time to s seconds
The maximum time allowed for a PPP negotiation to complete. If negotiations have not
completed in this time, the PPP instance is disconnected.
Desired local ACCM
The local Asynchronous Control Character Map which has the default value 0x00000000.
Changing this value is for advanced users.
Desired remote ACCM
The remote ACCM which has the default value 0xffffffff. As above, the default will work in nearly
all circumstances and should be changed only where really necessary.
Desired local MRU n bytes
The desired local Maximum Receive Unit (MRU), the default value of 1500 octets will work fine in
most cases.
Desired remote MRU n bytes
The value in this text box is the desired MRU for the remote end of the link. The default value of
1500 octets will be fine in most cases.
Request local ACFC
When enabled, causes the router to request Address Control Field Compression (ACFC). When
negotiated, the address/control fields are removed from the start of the PPP header.
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