Radio Transmission Features With Mpt-Hc/Mpt-Hc V2/Mpt-Mc - Alcatel-Lucent 9500 MPR User Manual

2.8.12 Radio Transmission Features with MPT-HC/MPT-HC V2/MPT-MC

2.8.12.1 Frequency Agility
The Frequency Agility feature gives the Operator the possibility to set via ECT the frequency of a single
Transceiver within a chosen sub–band to select the RF working channel. This implies benefits for spare
parts, order processing and frequency co–ordination.
2.8.12.2 Automatic Transmit Power Control (ATPC)
The Automatic Transmit Power Control (ATPC) function automatically increases or decreases the trans-
mit output power upon request from the opposite terminal. The opposite terminal constantly monitors
Receive Signal Level (RSL), receive signal quality, and aggregate Bit Error Rate (BER) of the receive sig-
nal.
When the ATPC is Enabled the transmit output will remain at it's lowest level until a fade occurs (or a
receive circuit alarm is detected). When the change in RSL is detected at the receive end, a command
is sent to the transmit end to increase power in 1 dB steps to it's highest level. After the fade is over, the
receive end commands the transmit power to decreases in 1 dB steps to the lowest level.
The ATPC range (high and low limits) is variable, determined by link distance, link location, and link fre-
quency. When ATPC Enabled is checked, the range values are shown in parenthesis (minimum - maxi-
mum) following ATPC Range.
When the ATPC is disabled the transmit output will always operate at it's highest level.
2.8.12.3 Transmitted power control: RTPC function
The capability to adjust the transmitted power in a static and fixed way (RTPC = Remote Transmit Power
Control) has been introduced for those countries where, due to internal rules, the ATPC function is not
accepted or for those hops in which due to the short length and interface problems, a fixed reduced
transmitted power is preferred. The range of the possible attenuation depends on the frequency band
involved. The setting of the transmitted power can be performed locally through ECT.
Output power is band and modulation dependent.
2.8.12.4 Power Monitoring
The MPT-HC/MPT-HC V2 incorporates a detector for Tx power measurement. It is used to provide
measurement of forward power as a performance parameter, and to provide a calibration input for
transmitter operation over temperature and output range.
Viewed Tx power ranges always match the capabilities of the MPT-HC/MPT-HC V2 for a given
modulation. When modulation is changed, the WebEML automatically adjusts/restricts Tx Power to be
within valid range.
2.8.12.5 Adaptive Equalization
Adaptive equalization (AE) is employed to improve reliability of operation under dispersive fade
conditions, typically encountered over long and difficult paths.
9500 MPR Rel. 3.1
168/980 3DB18809AAAA Issue 1
User Manual
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