In addition, it is also recommended to monitor regularly the quality of data transmission over E1
interfaces. On the E1 side, four CRC4 check bits are generated per sub-multiframe (SMF) and
compared with the corresponding bits of the next SMF. If they do not match, the CRC4 error
counter is incremented.
The G826 command is used to display the G.826 statistics.
The correctness of operation and configurations of network interfaces can be checked by using
loop back tests (LOOP1) and G.826 statistics of E1 interfaces. If LOOP1 is activated on this
network interface and the G826 statistics displays errors, a conclusion can be made that the E1
network interface of the FlexDSL Orion3 system is configured improperly or there is a malfunction.
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