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101

Implementation Notes for All Dial Services

117353-B Rev. 00

5-17

Example 2

For a connection between an ISDN and switched 56 Kb/s network (Figure 5-7),

the router adapts the data rate for the outgoing call to 56 Kb/s to match that of the

destination device, which can handle data only at 56 Kb/s. To do this, you set the

adaption rate for the outgoing phone number to 56 Kb/s.

Figure 5-7. Rate Adaption for a Switched 56 Kb/s Network

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.

ISDN

connection

56 Kb/s

Router

ISDN

Switched

56 Kb/s

DS0016A

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