Cabletron Systems MMAC-Plus 9F116-01, User Manual, Page: 293 / 420

On-line Operat ions 16-17
FRX4000 CSU/DSU Tests
To test the CSU/DSU port on an FRX4000, the port must first be disabled. If nec-
essary, press
[A] at the Operations Menu (or [B], [A] from the Main Menu) to disable
the port.
To run a CSU/DSU test, press [I] at the Operations Menu, then press the letter corre-
sponding to the desired test:
[A] = Self Test – transmits a test pattern to the analog portion of the circuitry and
loop the pattern back to itself.
[B] = Pattern Generation Test – transmits a PRBS (pseudo-random bit sequence)
test pattern to the remote device, which will loop the signals back.