Raisecom RC801 User Manual page 15

be off. If E-6 alarm occurs during operation, check whether optical RX port connects well
and RX optical power.
LOS red indicator of E1 sub-channel is on
Answer: Loss alarm of RX signal at E1 sub-channel, no HDB3 signal is received. Check
whether all E1 ports are connected well, or whether 75 Ω cables are reversely connected,
or whether the wires of 75 Ω cables are in right order. If LOS alarm occurs at unused E1
sub-channel, press "mask" button to "on" to musk the alarm after finishing the configuration
of device.
Mask button is on, but there is still alarm in unused E1 sub-channel.
Answer: probably the mask function is disabled if power supply is cut off and then turned on.
To solve is by pressing the mask button to "OFF", and then pressing to "on" to enable mask
function.
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