Raisecom Technology Co., Ltd
8
4. How to use
4.1. Front
panel
Front panel view
z
Power/error code test indicator light:
PWR/PAT Green/Yellow
：
Green
，
device power supply works normal;
Yellow
，
when doing the error bit test: there is no error bit; when there are error
bits, this light will turn Green for 1 second at least.
z
Alarm indicator light
：
ALM Red/Yellow:
Red (ON) LOS alarm of local E1 Rx.
Red (Flashing) LOS alarm of remote E1 Rx.
（
only in E1 fractional
mode
）
Yellow (ON) In fractional mode, there are local E1 Rx alarms: AIS
alarm, LOF alarm, LOMF alarm, CRC4 error alarm or
Coding Violation alarm;
In transparent mode, there are local E1 Rx alarms:
AIS alarm or Coding Violation alarm
Yellow (Flicking) There are remote Rx alarms: AIS alarm, G704 LOF
alarm, G704 LOMF alarm, CRC4 alarm and Coding
Violation alarm (only when pair used the devices and
in E1 fractional mode)
Note:
RC904-V35FE1-BL supports CRC4 auto-adapt function, when there is CRC4
information in Rx data, it will enable CRC4 function and there will be alarm if
there is CRC4 error; when there is no CRC4 information in Rx E1 data, CRC4
will be disabled and there will not be CRC4 error alarm.
z
V.35 interface
：
The left figure is a HDB26 connector, and Raisecom ISO2593
cable converter connector is required.
