China 3 Ptt Port Cross-Network Gateway Radio Repeater

What can RoIP achieve?
The fundamental of RoIP(Radio over IP)technology is to convert the audio and PTT signals in a radio terminal into IP packets and then transmit the data via the IP networks. The challenge in this technology is to insure that the audio is transmitted in real time and the PPT control signal is transmitted immediately and reliably. The radio range is general limited by the restricted transmitting power, the antenna sensitivity, and other environmental factors. The success deployment of this technology extends the coverage of a radio network without using expensive repeaters or links up multiple radio networks in the world. In addition, this technology can also link up the radio world to the VoIP world and the cellular world easily. It truly makes voice communications across multiple networks possible.
Which group can benefit from RoIP?
Adio Service Operators who would like to expands their geographical coverage.
Radio User who would like to make and receive calls from the telephone networks.
System administrators who would like to monitor and maintain good control over the existing radio networks.
System Integrator who would like to build or deploy a reliable voice communication network in timely manner
Key Features
· Support standard SIP to bridge Radio network viaIP network.
· DTMF code for remote Switch.
· Build in NAT
· IP recording.
· 3 PTT Ports.
· VAD technology, lower bandwidth
· PPPoE,fixed IP and DHCP access.
· DDNS supported.
· Built-in GSM module,Calling between GSM and Radio
Software Specifications
· Standard SIP VoIP Protocols ( IETF SIP V2)
· Codec: G.711 (A/µ law), G.729A/B, G.723.1
· Point-to-point protocol over Ethernet (PPPoE);
· Hypertext Transfer Protocol (HTTP);
· Dynamic Host Configuration Protocol (DHCP);
· Domain Name System (DNS);
· DTMF: In-band DTMF, SIP INFO
· Flexible jitter buffer
· VLAN / Qos
· Comfort noise generation (CNG)
· Voice activity detection (VAD)
· Dynamic DNS (DDNS)
· Support MXU up to 12 endpoints(only for RoIP302M)
Hardware Specifications
1 Physical and Operating Conditions
- Dimension: 25 x 14 x 3 cm
- Main Unit Net Wegith: 380 g
- Storage Temperature: -40°C - 80°C
- Operating Temperature: 0°C - 40°C
2 Core Design
- CPU: ARM9
- RAM: 16MB
- FLASH: 4MB
- DSP: 196 MHz
3 PTT Interface
- PTTIN Active Low: <0.7V (4.7KΩ load)
- PTTIN Active High: >1.2V
- PTTOUT High Output: 5V (4.7 KΩ load)
- PTTOUT Low Output: 0V
- APUT Output: 8Ω 750mW 5V P-P
- AIN Input: 600Ω Internal Impedance, 0 0.6Vp-t-p
- ADJOUT (on the Adapter Cable): 2KΩ Potentiometer
4 GSM Module
- Operating Frequencies: EGSM900MHZ/DCS1800MHz and GSM850MHz/PCS1900MHz
- Transmit Power: Class 4 (2W) at EGSM900. Class (1W) at DCS1800 and PCS1900
5 Network Port
- Ethernet Port: 10/100 base-T
- Standard Supported; IEEE802.1p
- IP Standard: IPV4