Functions of buttons and LEDs can be found on the face:
LED state | Explanation
Doesn?t light | There is no any running test.
| Lights continuously | There is a running interface test, or a test started from the face.
| Blinking | There is a running test started by the control system.
| Flash | Control system stops the test started from the face.
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LED state | On the proper wire pair...
Green and blinking | there is an ongoing synchronization.
| Green | there is a data communication of good quality.
| Orange | there is a data communication of medium quality.
| Red | the connection is broken.
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(The third LED will never light, because the modems at our Department can handle only two wire pairs.)
Rear panel of the modem is shown on the following figure: