Cisco Unified Communications 500 Series Model UC 540 Quick Start Guide 7
Back Panel
The back panel is where you connect the UC 540 to power. There is no
external On/Off power switch on the unit.
Line (FXO) ports Connects your phone system to the PSTN. Only
applies to model UC540W-FXO-K9.
If the power fails, you can still make and receive
emergency calls if you have a telephone line
connected to the Line (FXO) port 0 and an analog
phone connected to the Phone (FXS) port 3, even
if the unit is not powered on.
(Optional) One
factory-installed
Voice Interface Card
(VIC)
Provides connectivity to a Public Switched
Telephone Network (PSTN) or for additional
phone ports.
Compact Flash
Storage that contains the UC 540 software image,
default configuration values, and phone software.
WAN port Provides dedicated WAN (Internet) access.
Connects to a DSL router, cable modem, or other
WAN connectivity devices
Expansion port Provides a connection to a switch with ports for
additional phones or data devices. (We
recommend that you connect the UC 540 to a
Cisco ESW 500 Series switch.)
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