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Applications
Chapter 4
This chapter provides examples of some common Express 5200
data and voice applications. The data examples include SNA/
SDLC with local spoofing, SNMP/TELNET management, bisync
point-to-point, bisync multi-point, and transparent applications.
The voice applications include switched, voice over frame relay,
PLAR circuits, and direct FXS/FXO. The configuration selections
given in these examples may need modification based on your
network configuration.
DATA APPLICATIONS
SNA/SDLC with Local Spoofing
When used in an SNA/SDLC network, the Express 5200 provides
local spoofing by emulating the primary or secondary SDLC roles
(see Figure 4-1). The Express 5200 performs conversion from SDLC
to frame relay and also terminates SDLC links, providing primary
and secondary emulation between Express 5200s. Local spoofing
improves performance by reducing traffic across the frame relay
network and allows definite response times on the SDLC links.
To perform spoofing, the Express 5200 automatically sets itself up
to provide primary or secondary emulation based on the receipt of
SNRM (set normal response mode) from an SDLC device. The
Express 5200 looks for SNRM on all ports and assumes a secondary
role once SNRM is received. The Express 5200 then brings up the
LLC2 link across the frame relay network to another FRAD which
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Express 5200 User Manual
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