A Local Battery Design
A local backup battery unit is necessary in some telephony and combined telephony/data applications built with use of digital passive optical networks
.
In such networks there are active units on telephone exchange side and
on the user side, but nodes between them are all passive in the meaning
of electrical power usage. So, if a building (such as an apartment
house) loses power, the network continues to function. The user side
must have standby power since operating power isn't transferred over
data optical line.
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