Информатика и выч. техника \ Сетевое программное обеспечение

Optical Wavelength Conversion Unit. STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function, страница 6

Alarm description	Alarm name	Major cause of the alarm	Status of alarm indicator	Default alarm level
Loss of signal at receiving side	R-LOS	No light input	Continuously flash for 3 times every other second	Critical
Out-of-frame at receiving side	R-OOF	Input optical power too low or excessive error codes during transmission	Continuously flash for 3 times every other second	Critical
Loss of frame at receiving side	R-LOF	Input optical power too low or excessive error codes during transmission	Continuously flash for 3 times every other second	Critical
Laser transmitting failure	TF	Laser fault of this board	Continuously flash for 3 times every other second	Critical
Laser service life will soon end	LSR-WILL-DIE	Laser damaged	Continuously flash for 3 times every other second	Critical
Laser cooling current cross threshold	LSR-COOL-ALM	Laser damaged or ambient temperature too high	Continuously flash for twice every other second	Major
Input power too low	IN-PWR-LOW	Input optical power too low	Continuously flash 3 times every other second	Critical

Alarm description	Alarm name	Major cause of the alarm	Status of alarm indicator	Default alarm level
Input power too high	IN-PWR-HIGH	Input optical power too high	Continuously flash 3 times every other second	Critical
Transmitter deterioration	TD	Performance of laser deteriorates	Continuously flash 3 times every other second	Critical
Output power too high	OUT-PWR-HIGH	Optical transmitting module fault or board parameter setting improper	Continuously flash twice every other second	Major
Output power too low	OUT-PWR-LOW	Optical transmitting module fault or board parameter setting improper	Continuously flash twice every other second	Major
Alarm of board not in position	BDSTATUS	No board in subrack slot, board mailbox fault or board not inserted properly	Continuously flash twice every other second	Major
Regeneration section (B1)signal deterioration	B1SD	Input optical power too low or excessive error codes during transmission	Flash once every other second	Minor
Regeneration section (B1) excessive error codes	B1EXC	Received signal attenuation too large	Flash once every other second	Minor

The performance of TWC board includes: B1 error code counting, output optical power, input optical power, laser bias current and ambient temperature.

3.1.4 STM-16 Receiving Optical Wavelength Conversion Unit

1. Principle

The optical signals will suffer transmission damages to a certain extent after long distance transmission. The main transmission damages are waveform distortion and signal/noise ratio deterioration. The nonlinear effects of optical fibers, reflection of respective optical connectors, chromatic dispersion, polarization- mode dispersion, ASE noise of optical amplifier, etc. all can lead to transmission damages. In order to provide a fully transparent optical channel to SDH equipment and ensure the performance of the optical signals received by SDH receiver, the receiving end interface of OptiX BWS 320G system (namely RWC board) is provided with a highly sensitive optical receiving module, it can reliably receive the optical signals suffered from transmission damages and send them to SDH equipment after reshaping and regeneration. The function of RWC board in OptiX BWS 320G system is to ensure that any SDH equipment can reliably receive the signals after long distance transmission in DWDM mode.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Скачать файл