Xerox 3100MFPX 3100 MFP Guide to Faxing over IP Networks - Page 3

What Service Level is Required for the Phaser 3100MFP Fax? This table gives an approximate guide to the maximum levels of impairments that can be present and still support a successful fax call between two Phaser 3100MFP machines, each connected to a Sagem Fax ATA 101S, per configuration of VoIP/FoIP service used: Telephony/Fax Service G.711 (PCM) Pass-through * T.38 (no redundancy; ls=0 & hs=0) T.38 (max redundancy; ls=6, hs=4) Bandwidth 210 Kbps‡ 25 Kbps‡ 85 Kbps‡ Loss 0 % 0.4 % 6 % Delay 300 ms 350 ms 500 ms Jitter 50 ms 100 ms 50 ms * Note: If an initial G.729 voice codec is configured, the fax call should trigger a codec change to G.711 ‡ Bandwidth measured during image data at a fax rate of 14400 bps (V.17). Recommended Network Configuration Settings It is recommended that for reliable faxing the network should be configured for T.38 with redundancy. However, some network setups may not support it; those that do may fix the redundancy at a set level. Disabling fax Error Correct Mode (ECM) may improve reliability on a degraded network with a high level of impairments, but may increase the call duration on a better quality network and may result in received image defects. The screenshot below shows the recommended configuration for a degraded network, as performed on the Sagem Fax ATA 101S. dc09cc0449 Customer Support Page 3