Technical data

4. Packages
ISDN_CIRC_x_TYPE ISDN_CIRC_x_TYPE specifies the type of connection x. Possible values
are:
’raw’ RAW-IP
’ppp’ Sync-PPP
In most cases PPP is used, Raw-IP is a little more efficient because of the missing PPP
overhead. Authentification is not possible with Raw-IP but with variable ISDN_CIRC_x_-
DIALIN (see below) limitiations to explicit ISDN numbers (“Clip”) can be accomplished.
If ISDN_CIRC_x_TYPE is set to’raw’ /etc/ppp a raw up/down script will be executed in
analog to the PPP up/down scripts.
ISDN_CIRC_x_BUNDLING For ISDN channel bundeling the MPPP protocol according to
RFC 1717 is used. This inherits the following mostly irrelevant limitiations:
• Only possible with PPP connections, not with raw circuits
• channel bundeling according to newer RFC 1990 (MLP) is not possible
The second channel either can be added manually using imonc client or automatically
by bandwidth adaption, see description for ISDN_CIRC_x_BANDWIDTH.
Default setting: ISDN_CIRC_x_BUNDLING=’no’
Caution: using channel bundeling together with compression can trigger some problems,
see description for ISDN_CIRC_x_FRAMECOMP.
ISDN_CIRC_x_BANDWIDTH If ISDN channel bundeling is activated by
ISDN_CIRC_x_BUNDLING=’yes’ an automatical addition of the second ISDN channel can
be configured here. Two parameters have to be set:
1. threshold level in bytes/second (S)
2. time interval in seconds (Z)
If treshold level S is exceeded for Z seconds imond will add a second channel automat-
ically. If treshold level S is underrun for Z seconds imond will deactivate the second
channel again. Automatic bandwidth adaption may be deactivated with ISDN_CIRC_1_-
BANDWIDTH=”. After that channel bundeling can only be accomplished manually by the
imonc client.
Examples:
• ISDN_CIRC_1_BANDWIDTH=’6144 30’
If the transfer rate exceeds 6 kibibyte/second for 30 seconds the second channel will
be added.
• ISDN_CIRC_1_BANDWIDTH=’0 0’
The second ISDN channel will be added immedeately (not later than 10 seconds
after connection establishment and stays active until the connection terminates
completely.
• ISDN_CIRC_1_BANDWIDTH=”
The second ISDN channel only can be added manually, furthermore ISDN_CIRC_1_-
BUNDLING=’yes’ has to be set.
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