Cabletron Systems CSMIM2-16 Installation Manual page 54

Chapter 3: ROM Monitor Commands
When invoked, the command displays a menu of options.
monitor:: ports
Individual Port Tests (Data and Control Lines)
Some important notes:
- All Serial Ports (1-7) which are to be tested require a
loopback plug in order to pass the Data Line and Control Line
loopback tests.
WARNING. If there is a device instead of a loopback plug
connected to the port being tested, the device will have data
transmitted to it and its Control Line toggled.
Ports with faulty Control Lines:
Ports with faulty Data Lines:
Enter port number or range of ports to test (Return to exit):: 3
Enter the number of times to loop on this test [1]::
Testing data lines on channel 3
ERROR -- Data line loopback failure on port 3 Testing modem
signals on channel 3
ERROR -- No RTS/CTS turning (ON) loopback interrupt sensed on
Chan 3 !
Pressing the RETURN key after the prompt Selection (Return to exit)
returns you to the monitor prompt.
3-20 CSMIM2 Installation Guide