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LAPB2 default packet size:
This is the default packet size for calls being switched onto LAPB 2. The default packet size is 128,
other possible values are 256, 512 or 1024 bytes.
LAPB2 default window size:
This is the default window size for calls being switched onto LAPB 2. The default window size is 2, the
valid range is 1 to 7.
XOT remote IP address:
For calls being switched in the direction of XOT, this parameter speci
fi
es the destination IP address
to be used for the outgoing XOT call. This is also used as the destination IP address in the IP/UDP
stream modes.
XOT backup IP address:
If the
Backup from XOT
to parameter is set to “XOT”, this is the IP
address that the XOT call will be switched to, in the event the original XOT IP address is unavailable.
IP Stream port:
This parameter determines the IP port number used when IP stream or UDP stream are selected as
the parameter for any of the
Switch from
or
Backup from
parameters.
Note:
The XOT remote IP address and IP stream port parameters will be overridden by the values in the
NUA/NUI to IP addresses table if the call matches any entry in that table.
IP length header:
When IP length header is “On”, a length indicator
fi
eld is inserted at the start of each packet.
XOT source IP address interface:
The default value for this parameter is “Auto”, which means that the source IP address of an outgoing
XOT connection on an un-NATed GPRS link is the address of the PPP interface assigned to GPRS.
This is because the XOT connection is initiated (automatically) within the router and so does not
originate from the local subnet (LAN segment to which the unit is attached via the Ethernet interface).
However, this means that if you are routing traf
fi
c from the local subnet across a VPN tunnel you
would have to set up two Eroutes; one to match the local subnet address and one to match the XOT
source address (i.e. the address of the PPP interface associated with to the GPRS network).
By setting this parameter to “Ethernet” the unit will use the IP address of the Ethernet port instead of
that of the PPP interface so that you need only set up on Eroute.
XOT source IP address interface #:
This is the number of the
interface selected by the
XOT source IP address interface
parameter.
Don’t switch facilities:
If this parameter is set to “Off”, the packet size and window size are only switched if they need to,
i.e. they specify a value different from what is currently being negotiated. If this parameter is set to
“On”, the facilities shall not be switched.
Don’t strip facilities:
When set to “On” this parameter stops the X.25 switch from stripping packet size and window
size facilities as it switches an X.25 call. When set to “Off”, the X.25 switch will strip facilities if the
requested facilities match the de
fi
ned defaults for that interface.
Layer 2 Deactivation Clear Cause:
When one side of a switch call fails because layer 2 drops, the other side is usually cleared with a
clear cause 9 “out of order”. This parameter allows you to set this code to any value.
X25 Version:
This parameter allows you to switch between X.25 version 88, and X.25 version 84, in which clear
causes are always “0” when issued if the unit is the DTE.
