OfficeServ 7100 Installation Manual
3.4 Connecting Power Fail Transfer
4TRM and 4SLM option boards do not support Power Fail Transfer function.
If AC power is fails while battery is not connected, connect a power fail transfer circuit by connecting C.O. lines to extensions. If a pair of trunk lines(8TRK) is connected to pin1 and pin2 of the first port in 16SLI2 or 8SLI, the lines are connected to a typical phone through Pin 4 and 5 in 8TRK. In power failure, emergency calls can be available since the C.O. line is directly connected to the phone by the internal relay operation.
Figure 3.13 Connecting Power Fail Transfer to a 16SLI2/8SLI Board
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