| CPC G01R 31/396 (2019.01) [G01R 31/385 (2019.01); G01R 31/36 (2013.01)] | 20 Claims |

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1. A modular network test device to test optical fiber networks or other types of networks, the test device comprising:
a base module comprising:
a memory;
a processor to determine test results for a plurality of tests performed by the test device and store the test results in the memory;
a backplane, connected to the memory and processor, carrying power and communication signals;
a base module battery;
a base module charger; and
a plurality of interfaces to connect the backplane of the base module to at least one removably connectable module connectable to the base module,
wherein the processor determines power requirements of the base module and the at least one removably connectable module if the at least one removably connectable module is connected to the base module, and the processor controls discharging of the base module battery and at least one external battery of the at least one removably connected module to supply power to the test device based on the power requirements.
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