Cellular base station subsystem
A method of operating a cellular base station subsystem such as a smart bias tee. The method comprising: modulating a first control data signal to generate a first modulated carrier signal; multiplexing said first modulated carrier signal with a first RF antenna signal onto a feed line; demultiplexing a second RF antenna signal and a second modulated carrier signal from said feed line; demodulating the second modulated carrier signal to generate a second control data signal; analyzing at least one of said signals to generate diagnostic data; and outputting said diagnostic data. The subsystem also has an addressable memory adapted to provide data on request from said subsystem.
1 . A method of operating a cellular base station subsystem, the method comprising: modulating a first control data signal to generate a first modulated carrier signal; multiplexing said first modulated carrier signal with a first RF antenna signal onto a feed line; demultiplexing a second RF antenna signal and a second modulated carrier signal from said feed line; demodulating the second modulated carrier signal to generate a second control data signal; analyzing at least one of said signals to generate diagnostic data; and outputting said diagnostic data.
2 . A method according to claim 1 comprising analyzing the first or second control data signal to generate said diagnostic data.
3 . A method according to claim 1 comprising analyzing the first or second modulated carrier signal to generate said diagnostic data.
4 . A method according to claim 3 comprising measuring the signal strength of the first or second modulated carrier signal to generate said diagnostic data.
5 . A method according to claim 1 further comprising storing said diagnostic data in an addressable memory of said subsystem.
6 . A method according to claim 1 further comprising multiplexing a DC bias signal onto said feed line.
7 . A method according to claim 1 further comprising demultiplexing a DC bias signal from said feed line.
8 . A cellular base station subsystem comprising: a modulator adapted to modulate a first control data signal to generate a first modulated carrier signal; a multiplexer adapted to multiplex said first modulated carrier signal with a first RF antenna signal onto a feed line; a demultiplexer adapted to demultiplex a second RF antenna signal and a second modulated carrier signal from said feed line; a demodulator adapted to demodulate the second modulated carrier signal to generate a second control data signal; and a monitor adapted to analyze at least one of said signals to generate diagnostic data and output said diagnostic data.
9 . A method of operating a cellular base station subsystem, the method comprising: modulating a first control data signal to generate a first modulated carrier signal; multiplexing said first modulated carrier signal with a first RF antenna signal onto a feed line; demultiplexing a second RF antenna signal and a second modulated carrier signal from said feed line; demodulating the second modulated carrier signal to generate a second control data signal; requesting data from said subsystem; and providing data from a memory of said subsystem in response to the request.
10 . A method according to claim 9 further comprising assigning a network address to the subsystem, storing the network address in the memory; and requesting data from the memory using the network address.
11 . A method according to claim 9 wherein the subsystem is part of a point-to-multipoint network between a controller and a plurality of controlled devices; and the data is requested from the memory in order to perform a continuity check of the network.
12 . A method according to claim 11 wherein the point-to-multipoint network comprises two of said subsystems, and wherein the method comprises requesting data from a memory of each of said subsystems in order to perform a continuity check of the network.
13 . A method according to claim 11 further comprising isolating the subsystem from said plurality of controlled devices; and requesting data from said memory when said subsystem is isolated from said plurality of controlled devices.
14 . A method according to claim 9 further comprising multiplexing a DC bias signal onto said feed line.
15 . A method according to claim 9 further comprising demultiplexing a DC bias signal from said feed line.
16 . A cellular base station subsystem comprising: a modulator adapted to modulate a first control data signal to generate a first modulated carrier signal; a multiplexer adapted to multiplex said first modulated carrier signal with a first RF antenna signal onto a feed line; a demultiplexer adapted to demultiplex a second RF signal and a second modulated carrier input signal from said feed line; a demodulator adapted to demodulate the second modulated carrier signal to generate a second control data signal; and an addressable memory adapted to provide data on request from said subsystem.