Sys Is On; Alarms Of E1 Interface; Faq; Cross Connection Cannot Communicate Normally - Raisecom RC3000 PCM User Manual

9.1. SYS is ON

When there are alarms SYS will be ON. You can check the alarm information through
network management or Hyper Terminal to confirm why the buzzer buzzes:
a. Communication failure with user card.
b. Communication failure with line-board when line-board is RC3000-OPT.
c. Collision of channel occupation.
d. Fan problems.
e. Temperature collection problems
If these are not the reasons why buzzer buzzes, please contact us for technical support.

9.2. Alarms of E1 interface

If there are LOF, LOS or AIS alarms, please check the followings:
a. Cable of E1 or optical interface has been correctly connected.
b. Device connected to RC3000 works normally.
c. If E1 is not used, please shut it down.
d. Verify the impedance of both ends match each other, or change the
impedance.
e. Verify grounding protection.
If these are not the reasons, please contact us for technical support.

9.3. Cross connection cannot communicate normally

If channels cannot communicate normally, judge from the followings:
a. RC3000s of both ends work normally, otherwise reset the devices.
b. Correct use of user cards in both ends.
c. Verify the cables connected to user cards are good.
d. Verify the synchronization of both end devices.
e. Verify correct cross connection.
f. Verify correct parameter configuration, such as signal mode, data phase and
etc.
If these are not the reasons, please contact us for technical support.
9. Q & A
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Raisecom Technology Co., Ltd