Fiber optic visual fault locator

1. A visual fault locator, comprising:

a housing;

a receptacle retained by the housing and configured to retain a connector of a fiber optic cable under test;

a light source retained by the housing and positioned relative to the receptacle to emit light into a core of the fiber optic cable under test, wherein the emitted light from the light source has a wavelength dedicated for troubleshooting a break in the core of the fiber optic cable under test by being visually detectable through a jacket of the fiber optic cable under test at a point of the break in the core; and

an interface in the form of an electrical connector retained by the housing; and

wherein the housing is physically configured so as to be removeably installed in a port of a host device so that the interface electrically connects to a mating electrical connector in the port of the host device, the visual fault locator not including a power source and receiving operational power for the light source from the host device via the interface; and

wherein the visual fault locator is not capable of transmitting communications data in an optical signal; and

the visual fault locator further comprising:

a control circuit that controls operation of the light source, the control circuit powered by the operational power from the host device via the interface; and

a physical user input retained by the housing and operable by a user to control the control circuit to turn on and turn off the light source.

2. The visual fault locator of claim 1 , wherein the control circuit is further configured to receive commands to change operating states of the light source from user interface software.

3. The visual fault locator of claim 2 , further comprising a wireless interface over which the commands to change operating states of the light source are received from a portable electronic device that executes the user interface software.

4. The visual fault locator of claim 1 , wherein the port is configured according to Multi-Source Agreement (MSA) receptacle for Small Form Factor (SFF) electronics.

5. The visual fault locator of claim 1 , further comprising a sensor for detecting presence or absence of the connector of the fiber optic cable under test in the receptacle, the light source enabled if the connector is present and light source is disabled if the connector is not present.

6. The visual fault locator of claim 1 , further comprising a bail latch, the bail latch moveable between a latching position to latch the visual fault locator in the host device and a removal position.

7. The visual fault locator of claim 4 , wherein the position of the bail latch serves as an input to the control circuitry of the visual fault locator.

8. The visual fault locator of claim 1 , further comprising a bail latch, the bail latch moveable between a first position and a second position and wherein the position of the bail latch serves as an input to control circuitry of the visual fault locator.

9. The visual fault locator of claim 1 , wherein a wavelength of light emitted by the light source is changeable.

10. The visual fault locator of claim 1 , wherein an optical power of light emitted by the light source is changeable.

11. The visual fault locator of claim 10 , wherein the light emitter comprises multiple light emitters that are individually operable to vary the optical power of light emitted by the light source.

12. A data communications device, comprising:

a housing and an electrical interface configured according to Multi-Source Agreement (MSA) receptacle for Small Form Factor (SFF) electronics;

a receptacle retained by the housing and configured to retain a connector of a fiber optic cable;

an optical transceiver for at least one of receiving optical data signals or transmitting optical data signals over the fiber optic cable; and

a physical user input retained by the housing and operable by a user to control an operating state of the optical transceiver.

13. The visual fault locator of claim 1 , further comprising a light meter that monitors optical power of the light emitted by the light source, the control circuit regulating the emitted light based on an output of the light meter.

14. The visual fault locator of claim 1 , wherein the visual fault locator does not make communications with the host device other than carrying out a handshaking routine to confirm that the visual fault locator is an authorized device.

15. The visual fault locator of claim 1 , wherein the visual fault locator does not make communications with the host device.