3Com 3C10200 NBX Installation Guide - Page 232
Installing Fax Machines with ATAs
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232 APPENDIX C: GUIDELINES FOR CONNECTING REMOTE AUDIO DEVICES Installing Fax Machines with ATAs When installing a fax machine with a single-port Analog Terminal Adapter, consider the following points: ■ A fax machine requires twice the bandwidth (160 Kbps) of a voice device. ■ A fax machine must be configured to use Mulaw compression. ■ Problems encountered receiving or sending faxes could indicate network traffic issues. ■ Some PC faxes or modems may not work properly due to the very low latency requirements of such devices. ■ The most effective way to install a fax machine is to install it using an ATA connected to an uplink card or hub card in the NBX system, or to use a dedicated switch port for the ATA connected to the fax machine. ■ 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.