Definition and function interpretation of digital trunking radio

The digital trunking radio service is the most widely used communication scheduling tool in trunking communication. Generally, it needs to be realized within a certain coverage through a specially planned wireless communication frequency and a dedicated intercom carrier tool, which is specific and regional. specialty. The SMART-PTT trunking communication system based on CDMA 1/EVDO wireless network using VoIP technology reflects the difference from the above-mentioned traditional walkie-talkies. It can realize flexible talkback in a larger area covered by the mobile communication network. Extension and replacement of the functions of trunked communication products. Therefore, digital trunked walkie-talkies have also become the best choice for walkie-talkie enthusiasts.

Basic functions of digital trunking radio:

Fixed group call: After entering a fixed group, the user can make calls to all online users in this group, and can also receive calls from other users in the group.

Dynamic group establishment: The user can initiate an invitation to one or more online users and establish a dynamic group to make calls.

Single call: When a user invites a user to establish a dynamic group, a one-to-one single call intercom scenario is realized.

Edit fixed groups: Users with edit group permissions can add, modify and delete fixed groups on the mobile phone. You can add members of a fixed group and delete members of a fixed group.

User status display: On the client software, you can see whether each user in the group is online and make effective calls.

Call reminder: During the group call, the users participating in the call can receive various reminders related to the group call status.

Preemption call: In the same group, when multiple people make a call, under the same call authority, the caller first obtains the right to speak, and the rest of the users turn to the answering state.

User multiple groups: Users can view the members of multiple groups, and can enter multiple groups to make calls.

Default group: The default group is a group that users automatically enter after logging in. Each user can specify a default group.

Disconnection and automatic reconnection: When the data network is disconnected for some reason, the software will detect whether the network is available, and when the network is available, the software will redial the connection.

digital trunking radio system

Special functions of digital trunking radio system

User call priority: The user has a call priority. The administrator can set and modify the user's call priority. In the same group, when a user with a lower priority is calling, a user with a higher priority can interrupt their call at any time , And make a call.

Recording playback: Users can check and listen to the speech records of each group on the dispatching station and management platform, and can replay each record, and check and listen to all the call records in the enterprise on the enterprise management platform.

Monitor: Users can talk to multiple groups at the same time.

Broadcasting: The dispatching station can broadcast to all groups in its enterprise.

Authentication and encryption: When the PTT client logs in, the SHA1 Mac algorithm is used to authenticate the user. When transmitting sensitive data, the SHA1 and DES algorithms are used to encrypt the data.

User function settings: The administrator can dynamically add or cancel a user's functional modules, the administrator can set the user's functions, including: friend list; create dynamic groups; group switching; modify user names; view group recordings; Edit the group.

Data backup and recovery: The system can perform data backup and recovery functions for database data about users, groups, and user logs. The data backup adopts SQL text format, which can realize cross-platform recovery and increase data security.

Three-level management platform: The management platform is divided into two levels: operator management and enterprise management:
The main functions of the operator management platform: increase enterprise user accounts; modify enterprise user account attributes; manage user accounts; client software version management and online upgrade settings; manage account authority management; data backup and data recovery.

The main functions of the enterprise management platform: modify user data; add groups; modify group data; historical record management and playback; management of secondary management accounts.

Enterprise secondary management: modify user data; add groups; modify group data.

Digital trunking radio multifunctional dispatching station

Forced insertion: The dispatching station can forcefully insert the intercom of any group.

Forced dismantling: The dispatching station can force users to leave a group.

Remote kill: The dispatching station can remotely "turn off" the terminal cluster function.

Forced pull: The dispatcher can force online members who are not in the current group to the group.

Call: The dispatcher can make single call and group call to users.

Visual scheduling: Integrate mobile phone, personnel positioning, and group intercom.

Two-level scheduling: Each second-level management account added by the enterprise management platform will add a second-level scheduling account, and the second-level scheduling account can only schedule and manage the account that belongs to the second-level management.

Digital trunking radio flow calculation

When using SMART-PTT cluster communication, both the answer and the call will generate traffic, the generated traffic is 2.88M per hour of voice, and the heartbeat traffic of standby for 24 hours is 0.06M.

Digital trunking radio call delay

The way of voice delay networking is related to the performance of the wireless network. Under the 1x network, the average voice delay is 1 second, and generally no more than 2 seconds. Under the EVDO network, the average voice delay is 0.6 seconds, and generally no more than 1 second.