Avaya Configuring Dial Services Manual de usuario Pagina 126

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Configuring Dial Services
4-18 114062 Rev. B
X.25 Service over an ISDN D Channel (BRI only)
For routers used in France and Germany, you can send X.25 packets over an ISDN
D channel to an X.25 network. This feature reduces the cost of X.25 network
access because you do not have to use expensive leased lines. While the D channel
is in use, you can use the B channels for other dial service applications.
This feature is based on ITU-T recommendation X.31, which specifies how an
X.25 DTE communicates with an ISDN network. With the router’s ISDN
functionality, you dial into the ISDN network and send X.25 packets. These
packets are directed to the packet handling (PH) function in the ISDN network,
which processes an X.25 call and acts as a gateway between the ISDN network
and the X.25 network.
X.25 service over the D channel is available only for BRI interfaces on the AN,
ANH, ASN, and ARN using the single or quad ISDN/BRI module. A minimum of
8 Mb of memory is required to use this feature on these routers.
Recommendation X.31 states that packets sent over the D channel can travel at a
maximum of 9600 bps. If you use a higher baud rate, you lose data.
X.25 calls are made to the destination device using X.25 addresses in the call
request message. The router uses E.164 addresses for communication across the D
channel to the ISDN network, and uses X.121 addresses to call an X.25 network
directly. You specify the address in the X.25 packet configuration. Refer to
Configuring X.25 Services for more information.
One method of implementing X.25 over the D channel is to configure PDN
service. Refer to Configuring X.25 Services to learn how to configure PDN
service. Another method of implementing X.25 over the D channel is to use IPEX
single node switching. For information about IPEX and how to configure IPEX
single node switching, refer to Bay Networks 11.02 Document Change Notice.
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