User manual

得伯乐科技有限公司
DBL Technology Limited RoIP-302 User Manual
Web: www.dbltek.com
Tel: [phone]
v. 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.
vi. 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.
vii. Save Changes
Press “Save Changes” on the left column to save all changes made. The web server will not
remind you when you exit.
viii. The Online Upgrade selection is the first item in the Tools menu. Please check regularly