How do I configure an X.31 link (X.25 in the D-channel)?
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User’s Guide: Version 1.2
How do I configure an X.31 link (X.25 in the D-channel)?
X.31 is a supplementary service offered by your ISDN provider which al-
lows X.25 packets to be transmitted over an ISDN D-channel. This section
describes configuring the X.31 data link that can be used by hosts on the
LAN to connect to stations on the public X.25 network.
Before you begin
Before you start verify the following information from your ISDN carrier.
• The TEI value assigned to this interface.
• The Window and Packet size to use for Layer 3.
• The X.25 address of your V!CAS.
• The ISDN telephone number for this subscriber outlet.
Configure it
Verify License
Verify your X.25 license is valid. You should find “X25 (valid)”.
Configure the X.31 Link
If the V!CAS is connected to the ISDN subscriber outlet you’re receiv-
ing the X.31 service on, you should see an X.31 link in this menu, oth-
erwise connect the cabling and reboot the system. When autodetected
properly this link has the form:
x31d<Module Slot>-<ISDN Unit>-<TEI Value>
Verify the detected TEI value is correct then highlight the link and
press <Return> to define the characteristics of this data link.
L3 Mode
dte
L3 Window Size
128 bytes
L3 Packet Size
2
Lowest Two-Way-Channel
1
Highest Two-Way-Channel
2
Layer 2 Behaviour
always active
Create Route for Incoming Calls
Next, create a route for incoming calls. This will allow calls arriving
on the X.31 link that are addressed to the V!CAS’ X.25 address to be
✍
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(p. 28)
L
ICENSES
(p. 73)
X.25
L
INK
C
ONFIGURATION
(p. 76)
X.25
R
OUTING