Figure 4-1. Sna/Sdlc With Local Spoofing - ADTRAN Express 5200 User Manual

Chapter 4. Applications
assumes a primary role. This allows the Express 5200 to operate
with PU 2.1 devices.
Different roles can be assumed for each SDLC session. Disconnec-
tion starts the role determination procedure again.
In all cases, the Express 5200 is transparent to the XID (exchange identi-
fication) negotiation between any two network devices.
The Express 5200 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 4-1 for an example of how to configure the Express 5200 for
this application.
4-2

Figure 4-1. SNA/SDLC with Local Spoofing

Express 5200 User Manual 61202175L1-1