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Configuring X.25
Configuring the logical link to an X.25 network
X.121 and VCE Timer Val parameters
The last two parameters in to set values for in Ethernet > X.25 > X.25 profile is the X.121 src
addr parameter and the VCE Timer Val parameter.
The X.121 Src Addr parameter specifies the MAX source address for logical links defined in
the X.25 profile. An X.121 address contains from 1 to 15 decimal digits (for example,
031344159782738). The VCE Timer Val parameter specifies the number of seconds to
maintain a connection to a character-oriented device, such as a terminal server, that has not
established a virtual call.
For detailed information about each parameter, see the MAX Reference.
Type of connection
Both IP/X.25 and AO/DI only use nailed X.25 connections. The Call Type parameter specifies
the type of physical connection, which can be nailed or switched (X.25 PAD requires nailed).
Example of an X.25 profile configuration
This example focuses on an X.25 profile that establishes the logical link to an X.25 switch. It
does not show how to configure the nailed channels used for the physical connection to the
switch. For details about how to configure physical nailed connections, see Chapter 3,
"Configuring WAN Access."
You must obtain a copy of the telco's subscription form containing the values provisioned in
the switch and then configure the MAX X.25 profile to comply with those values.
Table 6-1 shows a sample telco subscription form and the corresponding settings to enter in an
X.25 profile.
Table 6-1. Sample telco subscription form
Subscription-item
Maximum seconds the transmitter waits for
acknowledgment before starting recovery
procedure (T1)
Maximum times to resend a frame after the
T1 timer expires (N2)
Maximum sequentially numbered frames
that a given DTE/DCE link can have
unacknowledged at any given time (K)
Is the X.25 node a DTE or DCE?
Is the link SVC or PVC?
Maximum packet size
6-6
Value
X.25 profile setting
3
LAPB T1=3
10
LAPB N2=10
7
LAPB K=7
DTE
X.25 Node Type=DTE
SVC
X.25 Link Setup Mode=Active
X.25 Lowest PVC=1
X.25 Highest PVC=8
1024
X.25 Max Pkt Size=1024
MAX 6000/3000 Network Configuration Guide
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