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14
Chapter 5 Loopback Test
1
LEDs status
LED Red: If the driver of the card is loaded correctly and the /etc/dahdi/system.conf file is
configured correctly, the LED Red of the four ports will be red clearly.
LED Green: If the PRI line is connected correctly, and it synchronizes to the other end
successfully, then the LED Green will be green clearly.
If the PRI line is connected correctly, and it is synchronizing to the other end, then both of the
LED Green and LED Red will be on clearly.
2
Use E1 cross-over cables to connect port 1 and port 4, port 2 and port 3, if the connection is
correct, the LEDs will turn to green.
3
Make a E1 crossover cable, the E1 crossover cable connection pins are as the following:
1 < --- > 4
2 < --- > 5
4 < --- > 1
5 < --- > 2
For the detail E1 crossover cable connection pins, please refer to the following link:
http://www.chebucto.ns.ca/Chebucto/Technical/Manuals/Max/max6000/gs/cables.htm#17
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