Digital data services and/or power distribution in optical fiber-based distributed communications systems providing digital data and radio frequency (RF) communications services, and related components and methods
Methods and systems for distribution of digital data services, radio frequency (RF) communications services, and power are provided for use in optical fiber-based distributed communications systems. Electrical digital data signals are received at a distribution unit. Downlink digital data signals representing the electrical digital data signals are distributed from the distribution unit over a downlink digital data services line to a remote antenna unit (RAU). Uplink digital data signals are received from the RAU over an uplink digital data services line and are distributed to head-end equipment. The distribution unit also receives optical RF communications signals and distributes the optical RF communications signals over at least one RF communications services optical fiber to the RAU. Power is also distributed, from at least one power output of the distribution unit, over at least one power line to the RAU.
1. A method for providing digital data services and/or power in an optical-fiber based distributed communications system, comprising:
receiving, at a distribution unit comprising at least one digital data services input, electrical digital data signals;
distributing, from at least one downlink digital data services output of the distribution unit, downlink digital data signals representing the received electrical digital data signals, over at least one downlink digital data services line to at least one remote antenna unit (RAU);
distributing, from at least one uplink digital data services output of the distribution unit to head-end equipment, uplink digital data signals representing electrical digital data signals received over at least one uplink digital data services line from the at least one RAU;
receiving, at one or more radio frequency (RF) communications services inputs of the distribution unit, optical RF communications signals; and
distributing, from at least one RF communications services output of the distribution unit, the optical RF communications signals over at least one RF communications services optical fiber to the at least one RAU;
distributing power, from at least one power output of the distribution unit, over at least one power line to the at least one RAU.
2. The method of claim 1 , wherein the distribution unit is an interconnect unit (ICU).
3. The method of claim 1 , wherein:
the at least one downlink digital data services line is comprised of at least one downlink digital data services optical fiber; and
the at least one uplink digital data services line is comprised of at least one uplink digital data services optical fiber.
4. The method of claim 1 , further comprising distributing downlink optical digital signals over at least one RF communications services downlink optical fiber to the at least one RAU from at least one downlink RF communications services output of the distribution unit.
5. The method of claim 1 , further comprising distributing uplink optical digital signals over at least one RF communications services uplink optical fiber to the at least one RAU from at least one uplink RF communications services output of the distribution unit.
6. The method of claim 1 , further comprising converting the electrical digital data signals from the at least one digital data services input into optical digital data signals.
7. The method of claim 6 , further comprising distributing the optical digital data signals from the at least one downlink digital data services output over the at least one downlink digital data services line to the at least one RAU.
8. The method of claim 1 , further comprising disposing the at least one downlink digital data services line, the at least one uplink digital data services line, the at least one RF communications services optical fiber, and the at least one power line in an array cable connected to the at least one RAU.
9. The method of claim 1 , further comprising receiving power at the at least one power output from at least one power supply.
10. The method of claim 1 , wherein the distributing power over the at least one power line to the at least one RAU comprises distributing power from a power supply that is external to the distribution unit and the at least one RAU.
11. The method of claim 1 , wherein the distributing power over the at least one power line to the at least one RAU comprises distributing power from a power supply located within the distribution unit.
12. An optical-fiber based distributed communications system, comprising:
head-end equipment configured to:
receive downlink electrical radio frequency (RF) communications services signals; and
convert the downlink electrical RF communications services signals into downlink optical RF communications services signals to be communicated over at least one optical RF communications services downlink;
a controller configured to:
receive downlink digital data services signals containing at least one digital data service; and
provide the downlink digital data services signals over at least one digital data services downlink; and
a plurality of remote antenna units (RAUs), each of the plurality of RAUs communicatively coupled to at least one of a plurality of digital data service clients configured to support digital data services, and each of the plurality of RAUs being configured to:
receive the downlink optical RF communications services signals from the at least one optical RF communications services downlink over at least one RF communications services optical fiber;
receive the downlink digital data services signals from the at least one digital data services downlink over at least one digital data services line;
receive power from at least one power supply over at least one power line; and
provide at least a portion of the power received from the at least one power supply to one or more of the plurality of digital data service clients.
13. The optical-fiber based distributed communications system of claim 12 , wherein the at least one power supply is located in an interconnect unit (ICU) located between the head-end equipment and the plurality of RAUs.
14. The optical-fiber based distributed communications system of claim 12 , wherein at least one of the plurality of RAUs is connected to the at least one power supply via an electrical power line and is configured to receive the power over the electrical power line.
15. The optical-fiber based distributed communications system of claim 14 , wherein the electrical power line is configured to provide power to at least one optical-to-electrical (O/E) converter and to at least one electrical-to-optical (E/O) converter, the at least one O/E converter configured to convert downlink optical digital signals into downlink electrical digital signals and the at least one E/O converter configured to convert uplink electrical digital signals into uplink optical digital signals.
16. The optical-fiber based distributed communications system of claim 12 , wherein the at least one digital data services line, the at least one RF communications services optical fiber, and the at least one power line are disposed in an array cable connected to at least one RAU of the plurality of RAUs.
17. The optical-fiber based distributed communications system of claim 12 , wherein the power from the at least one power supply is configured to provide power at a power level, the power level based on how many RAUs are in the plurality of RAUs and on a total expected load to be supported by the plurality of digital data service clients.
18. The optical-fiber based distributed communications system of claim 12 , wherein each of the plurality of RAUs further comprises an output port and a power interface, the power interface configured to receive power from the power supply via a voltage controller and provide the power to at least one of the plurality of digital data service clients via the output port.
19. The optical-fiber based distributed communications system of claim 18 , wherein each of the plurality of RAUs is configured to provide both power and digital data services to at least one of the plurality of digital data service clients via the output port.
20. A remote antenna unit (RAU) for use in an optical-fiber based distributed communications system, the optical-fiber based distributed communications system comprising head-end equipment configured to receive downlink electrical radio frequency (RF) communications services signals and convert the downlink electrical RF communications services signals into downlink optical RF communications services signals to be communicated over at least one optical RF communications services downlink, the RAU communicatively coupled to the head-end equipment and to at least one digital data service client configured to support digital data services, the RAU comprising:
an optical RF input configured to receive the downlink optical RF communications services signals from the at least one optical RF communications services downlink over at least one RF communications services optical fiber;
a digital data services input configured to receive downlink digital data services signals from at least one digital data services downlink over at least one digital data services line;
a power input configured to receive power from at least one power supply over at least one power line; and
a power output configured to provide at least a portion of the power received from the at least one power supply to the at least one digital data service client.