Remote Radio Access using the IPR100 Voice over IP Adaptor

An operator can control and monitor a remote transceiver across a Local Area Network or a Wide Area Network. The transmit and receive audio, along with the PTT and Busy/COS signals, are transported over the link transparently, using VoIP Multicasting techniques. SELCAL and DTMF are also transported reliably, regardless of the level of compression that is employed.

Multiple Omnitronics handsets and consoles can be multi-dropped to allow shared access to the transceiver by a number of operators.

 

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UHF/VHF Link Replacement using the IPR100 Voice over IP Adaptor

Two radios can be connected back-to-back over an IP link. This can typically be used to interconnect two repeater sites over a Wide Area Network. PTT and COS signals are transported over the link as data messages. The IPR100 will provide a configurable PTT output to the radio. It will also accept a configurable COS input from the radio. An active COS signal from the radio will enable the transmission of voice packets over the IP network and generate a PTT output at the opposite end. Full duplex operation is supported.

 

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Leased Line Replacement using the IPR100 Voice over IP Adaptor

Two audio devices, such as 4-wire audio bearers, can be connected back-to-back over an IP link. Since the communications equipment will not provide a COS output, a VOX function is implemented in the IPR100 using the VAD (Voice Activity Detector) feature. When a voice signal is detected at the radio port of the IPR100, an internal COS signal is generated and transmitted to the destination IPR100. This will also enable the transmission of voice packets over the IP network. A hang period is automatically applied to the VOX algorithm. Full duplex operation is supported.

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Interoperability over IP using IPR100's and the IPR400

The third application scenario enables interoperability with point to point or multipoint connections using either unicast or multicasting VoIP. The IPR100’s and IPR400’s allow multiple disparate transceivers such as VHF, UHF and trunking to be interconnected over an IP network in various combinations. This provides the means to configure powerful and flexible interoperable radio networks.

 

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Control and Monitor Repeater Sites using the IPR400

The IPR400 is ideally suited to repeater sites that feature shared equipment or multiple transceivers. Through its site monitoring facilities, the device can provide status and alarm reporting to the communications center. Consider the following example of a repeater site with two UHF and two VHF transceivers, belonging to two different agencies. The IPR400 acts as the IP gateway for the analog radios. Any audio that is received from
either of the four radios will be multicast to the WAN. Dispatch systems such as the DX64 will receive and process the audio. This means that dispatch operators at the different agencies can monitor all communications through that repeater site. It would also be possible for the different operators to broadcast on any of the remote transceivers, if desired.

 

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