3Com NBX, Installation Manual

Page: 109 / 248

Connecting Cards and Devices 109
c Enable the check box labeled Fax Machine , then click Apply .
Configuring an ATA port for fax operation optimizes the performance for
inbound and outbound faxes. If you make a voice call using the ATA
device (for example, if you use the telephone portion of the fax machine),
the quality of the audio may be affected. If you make a VTL call using the
ATA device, the audio may be unusable. If you configure the port for fax
operation, expect lower quality voice calls on that port. If you configure
the port for voice calls, the performance is not optimized for faxes.
Using Power over Ethernet with an ATA
The 3C10120B requires the use of a splitter device to accept Power over
Ethernet (PoE).
The 3C10400B ATA can accept power over the Ethernet cable. It meets
the IEEE 802.3af standard for Power over Ethernet. See
Table 22 for
power connection instructions. The 3C10400B ATA is a Class 3 PoE
device.
The 3C10400B ATA can also accept power from an AC power adapter
plugged into a wall socket. If you supply power to the ATA using an AC
power adapter and then also supply power on the Ethernet cable, the
ATA uses the Ethernet power source. If you supply power to the ATA over
the Ethernet cable and then also connect the AC power adapter, the ATA
continues to use the Ethernet cable power source. If you connect both
power sources to the ATA and later remove the Ethernet cable, the ATA
switches to use the AC power adapter.
Table 22 Connecting Power to an NBX Analog Terminal Adapter
Power
Source NBX ATA
Model Connection Details
AC power
adapter 3C10400B
3C10120B Any NBX ATA can accept power from an AC power adapter. Use the power
adapter that comes with your ATA. On all NBX devices, the power connector is
labeled with the DC power symbol: