Alcatel-Lucent 9500 MXC, Руководство пользователя

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Chapter 6. 9500 MXC Performance and Diagnostic Features
Vol. II-6-8 Alcatel-Lucent
when signal-to-noise ratios are low.
Adaptive Equalization
Adaptive equalization (AE) is employed to improve reliability of operation under
dispersive fade conditions, typically encountered over long and difficult paths.
This is achieved through a multi-tap equalizer consisting of two registers, one
with feed-forward taps, the other with feed-back taps. Each of these registers
multiply successive delayed samples of the received signal by
weighting-coefficients to remove propagation induced inter-symbol interference.
Tx Power Management
9500 MXC platforms provide comprehensive power management options for:
• Power Output
• Power Control Range
• Power Monitoring
Power Output
Output power is band and modulation dependent.
• ODU 300ep is an extended power ODU, with transmit outputs to 30.5 dBm at
6 to 8 GHz, and 21.5 dBm at 23 GHz.
• ODU 300hp is a high power ODU, with transmit outputs to 28.5 dBm at 6 to 8
GHz, 19.5 dBm at 23 GHz, and 17.5 dBm at 38 GHz.
Power Control Range
For ODU 300ep transmit power is programmable in 0.1 dB steps over a 30 dB
range for QPSK and 24/25dB for QAM options, with an accuracy of
+/-2dB over range and temperature. Figure 6-1 shows the ODU 300ep output
power attenuation range for manual control and ATPC.
For the ODU 300hp the power control range is 20 dB for QPSK, reducing to 16
dB for 128 QAM. Setting accuracy is also +/-2dB over range and temperature.