Config> n 6
Circuit config: 6>set net 5
Circuit config: 6>list all
Base net = 5
X.31 Support
The ITU Standard X.31 is for transmitting X.25 packets over ISDN. This standard
provides support for X.25 with Unconditional Notification on the ISDN BRI
D-channel.
X.31 is available from service providers in several countries. It gives the router a
9600bps X.25 circuit. Since the D-channel is always present, this condition can be
an X.25 PVC or SVC.
An X.31 example is, when a packet handler is provided by the ISDN service
provider, the X.25 packets and LAP/B frames (RRs, SABMEs, etc.) will be
transmitted and received on the D-channel along with the ISDN signaling
(Q931/Q921) messages. The D-channel provides a connection that enables the
ISDN user terminal to access the packet handler function within the ISDN by
establishing a link layer connection (SAPI=16) to that function which can then be
used to support packet communications according to X.25 layer 3 procedures.
Maximum frame transfer size is 260 bytes.
Example:
Config>n 6
Config>set data x25 6
Circuit config: 6>set net 5
Circuit config: 6>list all
Base net = 5
Note: You should assign an X.25 TEI or specify Auto on the BRI base net. The
default value is none.
Figure 38. X.31 Support
Using ISDN
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MRS V3.2 Software User’s Guide
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