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DSPbR® P25 Network Trunking Extender option

DSPbR P25 Trunking Extender

The Trunking Extender (T-Ex) is an option that may be added to a DSPbR Rebroadcast Repeater to provide an innovative solution to the rebroadcasting of APCO P25 Phase 1 and Phase 2 networks. The Trunking Extender option transcodes the P25 network donor site’s Control Channel, rebroadcasting it on different set of frequencies so subscriber terminals see the DSPbR rebroadcast site as ‘another’ site in the network.

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Example Application and Configuration

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  • Example Application and Configuration
DSPbR Trunking Extender Features:

The Trunking Extender (T-Ex) is an option that may be added to a DSPbR 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
• Configurable for RFOF Summing, RF Simulcast, and Fibre connectivity
• Compact Size - 19" 4RU Rack Mounting with DC or AC power supply options
• Hot swappable, modular plug'n'play architecture for easy upgrading and maintenance

Available Frequency Bands (MHz) 132-152, 150-174, 403-420, 410-430, 430-450, 450-470, 470-490, 480-500, 500-520, 746-766, 786-806, 805-825, 850-870
RF O/P Power APCO P25 P1 VHF/UHF Bands +10 to +45dBm, 7/800MHz bands +10 to +43dBm. APCO P25 P2 VHF/UHF Bands +10 to +36dBm, 7/800MHz bands +10 to +34dBm
Modes of operation Full Duplex, In-band or Cross-band Frequency Translating
Max. No. of Channels Up to 8Ch for 1 or 2 Bands, or 7Ch for 3 Bands (High RF O/P per Ch) Up to 12Ch for 1, 2 or 3 Bands (Low RF O/P per Ch) in a single chassis. Expandable up to 8 chassis (96Ch) in a multiple chassis configuration.
RF Channel Spacing 1.25KHz channel step, 12.5 and 25KHz channel bandwidth (other filter profiles available on request)
Gain Range 70-135dB
Receiver Sensitivity -116 dBm (minimum), better than -119 dBm (typical)
Noise Figure 6 dB max. (no ALC)
Frequency Translating Error < 100Hz
Power Supply 24VDC, 48VDC or 85-265VAC 50/60Hz
Cooling Active - Fan assisted.
Chassis Earthing M6 Earth stud on chassis rear
Environment Suitable for Indoor use only
Weight (inc. frame) 38kgs / 83.6lbs (typical fully populated chassis configuration)
Dimensions W 483 x D 460 x H 178mm / W 19 x D 18.1 x H 7"
User Interface GUI (Web browser enabled Graphical User Interface)
Automatic level control (ALC) range As required to maintain configured output power from available input level (up to 135dB max)
Tx Spurious Emissions < -30dBm (ACMA compliant) < -13dBm (FCC compliant)
Operational temperature range -30° C to +60° C / -22° F to 140° F

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