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61200.175L1-1 FSU 5622 ESP User Manual 25

Chapter 4. Applications

Chapter 4

Applications

This chapter provides examples of some common FSU 5622 ESP

data and voice applications. The data examples include SNA/

SDLC with local spoofing, SNMP/TELNET management, bisync

point-to-point and multi-point, and transparent applications.

The voice applications include direct FXS/FXO, switched, and

PLAR circuits. The configuration selections given in these

examples may need modification based on your network con-

figuration.

SNA/SDLC with Local Spoofing

When used in an SNA/SDLC network, the FSU 5622 ESP

provides local spoofing by emulating the primary or secondary

SDLC roles (see Figure 4-1). The FSU 5622 ESP performs conver-

sion from SDLC to frame relay and also terminates SDLC links,

providing primary and secondary emulation between FSU 5622

ESPs. 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 FSU 5622 ESP 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 FSU 5622 ESP looks for SNRM on all ports and

assumes a secondary role once SNRM is received. The FSU 5622

ESP then brings up the LLC2 link across the frame relay network

to another FRAD which assumes a primary role. This allows the

FSU 5622 ESP to operate with PU 2.1 devices.

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ADTRAN 1204006L1 Manual de usuario Pagina 41