NEC ux5000 Hardware Manual page 278

Chapter 4 - Terminals and Optional Equipment
4.15.8
PSA-R Adapter (Figure 4-33 - Figure 4-36
Using the PSA Adapter provides power failure capability for the IP (Enhanced or IP-CTS) and digital
Enhanced keysets. This allows a user to make or receive an outside call using the central office if a keyset is
unable to make or receive a call due to a power failure. In this case, the connection of the IP keyset would
automatically be changed from LAN to PSTN (public switched telephone network). This allows the dial pad
keys (0-9, * and #) to be used for placing and receiving calls - no other keyset functions are available.
When using this option, the handset must be replaced with the PSA and the dial pad must be replaced to
the double-contact type to disable the dial pad backlit option.
The operation occurs in the following instances:
No power supplied to the keyset
●
- The connection is automatically switched to an analog PSTN line when power failure occurs.
- Unless it was manually switched to PSTN mode, it will automatically switch back once power
is restored and the terminal is in an idle condition.
PSTN is selected using the PSTN-IP/Digital Switch on the adapter
●
- The PSTN mode is kept until the adapter is switched back to IP/Digital mode.
Headsets are not supported by the PSA Adapter.
✎
The baclight function does not operation on a terminal with a PSA Adapter installed.
✎
4 - 60
- P/N 0910090 (WH) and 0910088 (BK)
)
Chapter 4