User Manual

DRAFT RF Front End System Integration Manual
044-05082 Rev. A
3-1
March 2001
Section 3 Operating Instructions
3-1 Introduction
This section contains operating instructions for Powerwave’s RF Front End system.
3-2 Location and Function of the MHU and MHUI Controls and Indicators
The Masthead Unit (MHU) is not equipped with controls or indicators. Instead, the MHU inter-
faces with the host base station by way of the Masthead Unit Interface (MHUI). The location of
the controls and indicators for the MHUI are shown in figure 3-1. And described in detail below.
Figure 3-1 MHUI Control Panel
3-2.1 Main Power
The MHUI has a main power switch/circuit breaker and a +24 VDC power indicator (LED) to indi-
cate the power is cycled on the MHUI:
• The MHU amplifier alarm signal enters the amplifier in the DISABLED state and reports the
status as amplifier disabled.
• Except when the service loop shows continuity, in which case the MHU alarm signal will enter
the amplifier in the ENABLED state, unless faults or alarms would prohibit entry to such state.
3-2.2 Enable/Disable of Front Panel Functions
The front panel functions of the MHUI are key protected with the exception of the output power
display, monitoring alarms and main power switch.
3-2.3 MHUI Cell Size Attenuator Settings
The MHUI cell size setting is performed either manually or by remote control. This is indicated by
one of two LEDs illuminated.
At the front of the MHUI a push-button switch is used to enable RF power adjustments for cell
size. If the cell size is controlled by remote and if there is any manual adjustment via the front-
panel, the mode will be manual until a new RS-485 command is received. The attenuator adjust-
ment range is between 0 and 20dB.