ROIP302 Series User menu
6.10
Group Codec Setting
Voice codec is commonly used in voice over IP communications. It enables voice to be compressed
in order to save the transmission bandwidth. The higher the compression rate is, the low the
transmission bandwidth is required. However, the voice quality is degraded as the compression rate
goes higher. In general, a-law,
μ
-law, and G.729 are commonly used. The transmission rate of a
single voice channel is about 82Kbps for a-law or
μ
-law and about 26Kbps for G.729. However,
when a radio station is required to transmit voice data, only a-law or
μ
-law codec should be selected
for no loss in voice quality.
It is important to note that all users in the same group must use the same codec.
6.11
Group Settings
The Group Settings assigns the radio channels (3 PTT Ports) and the GSM channel to one of the
three groups available. Once a channel is assigned, it cannot be assigned to another group.
In the diagram below, all 4 channels are assigned to Group 1. This means that there are no channels
left for Group 2 and 3. In this case, RoIP302 can only support one group operation. However, for
RoIP302M/RoIP302GM , Group 2 and 3 can be used as a conference bridge for other RoIP302s.
Please note that the web interface does not check for duplicate selection among groups. Please
make sure that each PTT or GSM channel can only be assigned to a group no more than one time.
6.12
Save Changes
Press “Save Changes” on the left column to save all changes made. The web server will not remind
you when you exit.
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