Description
Model 50PA-1248 is a full fan-out 4 x 4 handover test system for cellular testing. As shown in the block diagram, it is a 4 x 4 matrix constructed using power dividers/combiners on both halves of the matrix. The power divider/combiners create full fan-out functionality so that no input port is blocked from use to any of the output ports. Every RF path through the 4 x 4 matrix has its own individually controlled programmable attenuator (0-70dB by 1dB steps). If an antenna is connected to an input port, the RF signal from that antenna will be available to all output ports simultaneously at different signal levels by adjusting the attenuation setting of each programmable attenuator. We label the ports as IN and OUT as a naming convention only. All ports operate bi-directionally.
Manual Attenuator Control
The manual control menu allows you to set/read an attenuator, fade an attenuator, or perform a handover using two attenuators.
Remote Attenuator Control
This attenuator assembly can be remotely controlled via an Ethernet connection or a serial connection (i.e. RS-232). The network settings can be changed manually with the keypad or remotely using the NET remote command. The network interface can be set to either DHCP mode or Fixed Address mode. All new test systems are shipped from the factory in DHCP mode. A RS-232 connection to the test system is made using a null modem type serial cable. Baud rates up to 155200 baud are available. The baud rate can be changed manually with the keypad or remotely with the SERIAL remote command.
