
Implementation Notes for All Dial Services
308621-14.00 Rev 00
5-19
One method of implementing X.25 over the D channel is to configure PDN
service. Another method of implementing X.25 over the D channel is to use IPEX
single-node switching.
For information about X.25 packet configuration, PDN service, and IPEX single-
node switching, see Configuring X.25 Services.
Figure 5-8
shows how X.25 is implemented over the D channel using PDN
service.
Figure 5-8. X.25 over the D Channel
Configuring X.25 Service over the D Channel
You enable the X.25 over the D Channel feature for each BRI line. You can also
configure multiple D channel interfaces with X.25. For configuration instructions,
see “Configuring X.25 over a D Channel (BRI Only)” on page 11-11.
ISDN
X.25
PSPDN
ET
PH
ET
X.25 host (DTE)
Router
DS0035A
Key
ET = Exchange terminator
PH = Packet handling
PSPDN = Packet switched
public data network
X.25
terminal
X.25
terminal
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