User manual

Beijing Raisecom Science & Technology Co., Ltd.

http://www.raisecom.com

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1. Local V.35 interface loop-back. Refer to previous dip-switch setup for details. If the Router

indicates loop-back successful, the V.35 interface is working in good condition. If the Router

indicates loop-back fails, please first check the timing resource and bandwidth setup at local

site, and try to adjust the TX CLK and RX CLK phase option switch.

2. After the success of the first step, check if the optical link works in good condition. If

RC802-30B-FV35 modems work in pairs (or adopts RC800-30B at the remote site), users are

advised to perform the remote loop-back test. The local Router shall indicate if the remote

loop-back in optical link is successful.

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

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 RC802-30B-FV35 appears local alarm, DCD signals will be disconnected at V.35 interface, and

the DTE shall response that.

If RC802-30B-FV35 appears remote alarm, 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 (ALM) is ON.

Answer: ALM is ON indicates that local equipment appears alarm. ALM is FLASH indicates that

remote equipment appears alarm.

 Severe packet loss of DTE equipment

Answer: The possible reasons for severe packet loss are：

1． Incorrect timing resource setup

2． Check V.35 interface status of the Router, if there are data errors on input and output, then it

indicates that TX CLKand RX CLK phase relationship need to be adjusted. This problem can