Cisco Cisco 1 GHz GainStar Node 安装指南
4035009 Rev B
Balancing and Setup
3-3
Balancing the Forward Path
Introduction
Be sure to use the correct procedure for forward path balancing. Refer to
To Test the
Forward Input Optical Power (on page 3-3) for help in identifying the procedure
that best fits your system installation and node type. Before you begin, make sure
that the mainboard is configured according to the specifications in the design print,
and that the node has warmed up for approximately one hour.
The forward section of the GainStar Mini Node performs conversion, amplification,
equalization, and test point functions for the forward path signal.
that best fits your system installation and node type. Before you begin, make sure
that the mainboard is configured according to the specifications in the design print,
and that the node has warmed up for approximately one hour.
The forward section of the GainStar Mini Node performs conversion, amplification,
equalization, and test point functions for the forward path signal.
To Test the Forward Input Optical Power
Follow these steps to set or adjust input optical power.
1
Clean the input fiber interface.
2
Connect the input fiber connector to see the Optical Power from the LED
indicator. Following diagram shows the different input optical power level
indicated by the lighting status of LED.
indicator. Following diagram shows the different input optical power level
indicated by the lighting status of LED.
3
Read the input optical power from the LED indicator. The recommended
range is -4 dBm to +2 dBm.
range is -4 dBm to +2 dBm.
4
Compare the measured levels to the design input levels on the system design
print.
a) Proceed to step 5.
b) Adjust the Optical Power.
print.
a) Proceed to step 5.
b) Adjust the Optical Power.
5
Connect the input fiber to the below fiber bulkhead.
Continued on next page