NEC ELECTRA ELITE IPK II, System Hardware Manual, Page: 444 / 642

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9 - 38 Installing Electra Elite IPK II Optional Terminal Equipment
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Document Revision 3 Electra Elite IPK II
3.8 PS(A)-R Unit
3.8.1 Description
The PS(A)-R Unit, an optional adapter for the ITH/ITR-3 Terminals,
is used with IP telephones to make or receive a call using the Public
Switched Telephone Network (PSTN) when a call cannot be made or
received using the Local Area Network (LAN). When a power failure
occurs, the IP telephone is automatically switched to the PSTN.
When power is restored, the IP telephone restarts and connects to
the network unless a conversation is in progress on PSTN. The
PSTN call must be completed by going On-hook before the
connection to the LAN is restored. Refer to
Figure 9-38 PS(A)-R
Unit .
Figure 9-38 PS(A)-R Unit
LAN/PSTN Switch
PSTN Line Connection
Receive Volume Control
Handset Connection