Troubleshooting - Dynamix RC 903-V35FE1 User Manual

If there are any problems during installation and operation, please try to solve them
according to the following suggestions. If the problems still exist, please contact
distributors for help.
Power (PWR): indicator OFF
Answer: Please check if there is any fault with power supply.
Loss-of-Signal (LOS) alarm in E1 link: indicator ON
Answer: LOS alarm caution that your E1 interface cannot receive signal. Please check
if the input cable is properly connected. If using 120Ω twisted-pair interface, please check
if the line sequence is correct. Please also check if transmitting and receiving cables
are reversely connected, and avoid hot swapping. Process local loop-back test, if there is
still alarm, thus it indicates that the E1 interface of converter has been damaged.
Alarm indicator for the error of E1 receiving signal (AIS, LOF, LOMF, CV, CRC)
ON
Answer: It means that there is error of received signal in the E1 link. Please check the line
of E1 receiving side and the E1 frame mode parameters of the opposite equipment.
Alarm indicator for the error of E1 receiving signal (AIS, LOF, LOMF, CV, CRC)
Flashing
Answer: It means that the E1 receiving side of the remote equipment, in other words, the
sending side of the local equipment has some problem.
Severe packet loss of the equipment:
Answer: The possible reasons for severe packet loss are:
1. Incorrect clock mode setting
2. Check V.35 interface status of the Router, if there are data errors of input and output,
then it indicates that TX CLK and RX CLK phase relationship need to be adjusted.
This problem can be located by doing local V.35 interface loop-back test.
3. Cable loose at E1 port or wrong line sequence.
4. The 75Ω cable is not strictly grounded. It will cause disturbance.
Compatibility with equipment of other brands
Answer: RC903-V35FE1 can cooperate with similar products of other brands, and also
can cooperate with Routers with fractional E1 interface. It is needed to ensure they are
using same time slot engrossment and same setting of PCM30/31 and CRC.
However, Passive Bandwidth Control function and E1 loop-back test of remote converter
cannot be used.

6. Troubleshooting

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