ADTRAN 1204006L1 Manuel d'utilisateur Page 60

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Chapter 5. Applications
5-2 Express 5210 User Manual 61200208L1-1
Different roles can be assumed for each SDLC session. Disconnec-
tion starts the role determination procedure again.
The Express 5210 uses LLC protocol (mode 2) to transport SDLC
information frames. This protocol ensures a reliable link across
frame relay, providing protection from frame loss and excessive
delays. The encapsulation method uses the RFC 1490 format. See
Table 5-1 for an example of how to configure the Express 5210 for
this application.
Figure 5-1. SNA/SDLC with Local Spoofing
In all cases, the Express 5210 is transparent to the XID (exchange identi-
fication) negotiation between any two network devices.
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