Информатика и выч. техника \ Сетевое программное обеспечение

Optical Wavelength Conversion Unit. STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function, страница 11

n DWDM port receiver overload optical power: -9dBm (APD receiver module) or 0 dBm (PIN receiver module);

n Minimum receiving sensitivity of SDH side optical receiver: -21dBm.

n Overload optical power of SDH side optical receiver: 0dBm;

n It has regenerating function with performance indexes completely in compliance with ITU-T, such as input jitter tolerance, and jitter transfer characteristics, etc.;

n It provides regenerator section B1,J0 check and enables line fault location;

n LWC board provides the following monitoring functions: laser bias current monitoring, laser cooling current monitoring, laser transmitting optical power monitoring, and receiving optical power monitoring;

3. Applications

LWC combines the function of RWC and TWC together, and is added with the function of FEC(Forward Error Correction).

LWC can be inserted in 1~13 board position of OptiX BWS 320G subrack.

The optical connector on LWC board handle bar is of SC type.

4. Common alarm performance

LWC board is mainly composed of the optical transmitting module and optical receiving module, so its alarms mainly reflect the working status of these two modules. Alarms of LWC board are shown in Table 3-7.

Table 3-7 List of LWC board alarms

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
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

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