4 - 60 Chapter 4
Chapter 4 - Terminals and Optional Equipment
4.15.8 PSA-R Adapter (Figure 4-33 - Figure 4-36 - P/N 0910090 (WH) and 0910088 (BK))
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.
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