Toa N-8000 Series - Manual (Page 498)

Chapter 5 SYSTEM SETTINGS BY SOFTWARE
C/O Interface: Function Settings 1
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5.9.2. Function settings
Step 1. Click "Function Settings 1" tab to display the following setting screen.
(9) Available bit rate
Set the capacity (or a usable upper limit value) of the network line to which the C/O interface unit is connected.
Setting this communication capacity prevents sound quality deterioration and longer time delays caused by
excess conversation and/or paging communications traffic.
(10) Broadcast Spec
Select the voice transmission mode that is appropriate for the usable frequency band.
• High quality sound transmission mode
Transmits voices at high sound quality with short time delay. Use this mode as the normal default mode.
• Standard mode
Transmits voice audio with a short time delay. In this mode, the sound quality is reduced, but the delay
time is identical to that in high quality mode, allowing a narrower frequency band to be used. Use this
mode when C/O interface units are connected via an ISDN line (128 kbps).
• Band width saving transmission mode
Voice transmission uses a very narrow frequency band, but with lesser quality sound and longer time
delay. Use this mode when C/O interface units are connected via an Analog line (56 kbps).
Sampling frequency Delay time Frequency band to be used
High quality sound
transmission mode
16 kHz 0.08 second 130 kbps
Standard mode 8 kHz 0.08 second 98 kbps
Band width saving
transmission mode
8 kHz 0.32 second 49.5 kbps