Raisecom Technology Co., Ltd.
http://www.raisecom.com
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3.
If the modem is not working in pairs, it is required that the other brand equipment be
configured exactly the same as the local modem, including PCM30/31 format, CRC
enable/disable, and timing resource etc. If these parameters are properly configured, then
please pay attention to the V.35 data engrossment in frame format. Refer to Chapter 1.3.4 for
timeslot engrossment and ensure that both equipments have the same configuration.
4.
After success of the second step (or ensure the 3
rd
step), it is indicated that the
communication link between local and remote equipments is working properly. Now, if the
remote V.35 interface is connected properly but still cannot communicate normally, please
adjust the TX CLK or RX CLK phase option on remote modem (or converter).
If the link still remains disconnected, please contact the technical support from the local
distributors. It is strongly suggested users present a report of the encountered problems along with
network topology, and the test details of the above four steps, and email the report to the technical
support.
4.3 Fault-pass-through Function
If LAL alarm appears, DCD signals will be disconnected at V.35 interface, and the DTE shall
response that.
If RAL alarm appears, CTS signals will be disconnected at V.35 interface, and the DTE shall
response that.
4.4 FAQs
If there is any problem during installation and operation, please try the following solutions. If the
problems still cannot be solved, please contact distributors for technical support.
Local Alarm Indicator is ON.
Answer: It is possible that there is uplink alarm (AIS), loss of frame (LOF), or CRC alarm
appearing on the modem. It indicates that the signal received is abnormal. Please check the link
quality and interface parameter at the remote site.
Remote Alarm Indicator is ON.
Answer: It is because there is receiving alarm at the remote site. The signal is send by the remote
interface converter RC903-V35FE1.
Optical Interface LLOS (RLOS) is ON.
Answer: Receiving signal at optical interface is lost. Please check if the optical input (RX) is
connected, or reversely connected. Users can use the optical power meter to test the receiving
optical power to check if it is above the threshold of optical receiving sensitivity.
Optical Interface LLOF (RLOF) is ON.
Answer: Optical receiving signal is loss of frame. Optical signals are receiving but the optical
power may be around the threshold. Please check the receiving optical power. If connects modem
