Simulate a FEP

FEP (e.g. Cisco Router 2500)

int s 0
encapsulation sdlc-primary
nrzi-encoding
clockrate 19200
sdlc address c1

Controller (e.g. Cisco Router 2500)

int s 0
encapsulation sdlc-secondary
nrzi encoding
clockrate 19200
sdls address 5

The FEP and controller are directly connected via a serial port to "the STUN routers".

How to Send a Test Frame (polling)

sdlc test serial 0 c1 continuous