C Loopback Tests

6.Enter data from your keyboard. Typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeroes. Data re- ceived by the remote modem enters its analog receiver, is converted to digital data, is reconverted into analog, and then is transmitted back to your modem. Your modem passes this test if the data received on your monitor is the same as the data entered from your keyboard.

7. To exit the test, turn off the modems.

Modem

PHONE

LINE LEASED

 

EIA RS232C

 

 

under test

 

VOLUME

Jumper pins 2 and 3.

POWER

Local modem

PHONE LINE LEASED

EIA RS232C

VOLUME

POWER

Figure C-5. Back-to-back test connections.

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Multi-Tech Systems MT5600BL, MT5600BA manual Figure C-5. Back-to-back test connections