RFI DSPbR® P25 Network Trunking Extender

RFI DSPbR® P25 Network Trunking Extender

The DSPbR® P25 Network Trunking Extender (TRex) is an option that may be added to a DSPbR or DSPbR EDGE Rebroadcast Repeater to provide an innovative solution to the rebroadcasting of APCO P25 Phase 1 and Phase 2 networks. The Trunking Extender transcodes the rebroadcast P25 network donor site’s Control Channel. The DSPbR-provided coverage footprint is frequency-translated to a different set of frequencies to those of the donor network site, and the transcoded Control Channel data content passing through the DSPbR makes subscriber terminals see the DSPbR as ‘another’ network site. The use of frequency translation prevents the occurrence of simulcast overlap between the coverage provided by the network donor site and the DSPbR. It also facilitates achieving the intra-system RF isolation required at a rebroadcast site to prevent the performance degradation that may otherwise occur if identical frequencies were used for both the uplink and downlink RF signal paths (i.e. RF feedback). The transcoding process allows subscriber terminals to hand-over to and from the rebroadcast site coverage as they would between network sites themselves. The Trunking Extender can also be configured to broadcast specific Adjacent Control Channels to enhance subscriber terminals’ mobility through the network and rebroadcast coverage areas. Frequency-translation may be configured within one frequency sub-band or across different frequency bands, creating opportunities to utilise any available spectrum in rebroadcast coverage areas – particularly with the increasing availability of multi-band subscriber terminals.

• Rebroadcasts both P25 Phase 1 and Phase 2 networks
• Supports Trunking and Conventional channels across one or more frequency bands
• Innovative Control Channel transcoding techniques
• Supports in-band or cross-band rebroadcast
• Secure RF-transparent operation – supports traffic channel encryption, OTAR, etc
• Programmable parameters per-channel, and independently in uplink and downlink

Documents:

18073 – RFI TRex, Application – Note
18073 – RFI TRex, Trunking Extender – Product Introduction
18073 – RFI TRex_DSPbR, Trunking Extender – Specifications