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FCD-IPM Installation and Operation Manual Chapter 5 Setup Menu
Routing/Bridging Menu 5-13
PPP Settings
This option is only available for PPP link protocol.
Table 5-6. PPP Settings
Parameters Possible Values Description
Header and
Control Field
Compression
Yes, No
Used for troubleshooting only. Change the Header and Control Field
Compression setting only if there is a problem with PPP negotiation
Protocol Field
Compression
Yes, No
Used for troubleshooting only. Change the Protocol Field Compression
setting only if there is a problem with PPP negotiation
IP Compression
Yes, No
Activates Van Jacobson TCP Header Compression on a specified link.
PPP is often used on slow bandwidth links, such as modems. To make
the transmission faster, certain parts of the data packets can be
compressed.
In Van Jacobson TCP Header Compression the TCP/IP packet header is
compressed according to RRC 1144. Other protocols running over IP
(for example, UDP, ICMP) are not affected by using Van Jacobson
compression. Since PPP is used for point to point transmissions, both
the local and remote devices must have Van Jacobson TCP Header
Compression enabled for compression to be performed. To verify that
Van Jacobson TCP Header Compression is being performed, open the
Interface Connections Screen
Multilink
Disabled
Enabled
BOD
Determines if a line supports multilink PPP (RFC 1990 compliant).
The line does not support multilink PPP
The line supports multilink PPP
The line enables multilink PPP with Bandwidth-on-Demand support
(for ISDN line only).
Permitting multilink PPP means that two neighboring links (or two
ISDN B-channels) will work as a single logical channel, thereby
increasing the total link bandwidth. If you select Permanent, then both
links will be connected simultaneously, independent of bandwidth
utilization. Using BOD permits you to be connected most of the time
with only one B-channel and to be connected with the second channel
for small periods of high bandwidth utilization. This method reduces
connection costs.
If you choose BOD, then configure the following parameters:
Sensibility Direction and Sensibility Timeout.
BOD Sensibility
Direction
Transmit,
Receive, Both
Defines the traffic direction to be counted in determining whether to
connect the second line.
BOD Sensibility
Timeout
Defines the time interval for the utilization count