SB2025NT-T/N P25 Simulcast/Voting Base Station Repeater

The SB2025NT-T/N Simulcast Base Station offers market leading P25 performance in a robust, reliable yet compact 2U form factor. Designed and built to exceed industry standards, the SB2025NT-T/N is a spectrum efficient solution, perfectly suited to wide areas of coverage.

Overview

• Simulcast technology synchronises duplicated channels in a wide area network to avoid interference between adjacent radio sites.
• Digital VoIP signals are better defined and more consistent than their analogue counterparts, enabling the synchronisation task to be ‘processor controlled’.
• SB2025NT-T/N incorporates an RSSI voter which can operate in talk through mode with simulcast transmit.
• Easy to deploy base station, with intuitive set up and simple remote management.

General Specifications

• Antenna Connector – Rx, Tx both N type female
• Channel Spacing – Analogue – Programmable 25/12.5 kHz. Digital – 12.5 kHz
• Channels – 255
• Frequency* – 148-174 MHz, 400-435 MHz, 435-470 MHz, 850-870 MHz (TX), 805-825MHz (RX) Other bands by request Modulation – Analogue – Direct FM two point method. Digital – C4FM
• Operating Temperature – – 30 ˚C to +60 ˚C (-22 ˚F to 140 ˚F) Physical Size – 2RU Height x 19” rack mount
• Supply Voltage – 13.8 VDC +/- 20%
• Models – SB2025NT-T – Traffic Manager + Network Interface SB2025NT-N – Network Interface only

Transmitter

• Frequency Stability – 1.5 PPM
• Modulation Fidelity – Less than 3%
• Power Output – 100 W
• Symbol Deviation – 1.8 kHz

Receiver

• Audio Bandwidth – 300 Hz to 3000 Hz (+1,-3dB)
• Distortion – Less than 2% @ 60% deviation
• Intermodulation Immunity – Better than 82 dB blocking better than 100 dB at +/- 1MHz point
• Sensitivity – Better than – 117 dBm for 12 dB SINAD, typ -120 dBm. P25 – Better than – 117 dBm for 5% BER

Solar 2

Solar 2 builds on the success of the Solar-Sync principles of a straight-forward plug & play Digital IP Simulcast and Voting solution, extending this capability to enable compact integration of Traffic Manager, Voter and Network Modules in a single 1U chassis together with full remote management and Traffic Manager resilience.

The system consists of Network Interface and Traffic Manager Modules, which can be selectively deployed in the 1U Chassis to achieve the desired network solution. The compact form factor and modular architecture means Solar 2 can be more effectively deployed in a small system desktop and larger network solution environments, where rack space is at a premium. Traffic Manager, at the heart of the system, provides voice routing, redundancy options and supervision, whilst fully duplex Network Interfaces provide connectivity of remote stations and dispatch consoles to the IP infrastructure.

Traffic Manager Capacity

A single Solar 2 Traffic Manager(TM) can accommodate a maximum number of 32 base stations with a maximum of 16 console interface connections by default. With the additional channel option, the user can select stations to form independent channel groups (to a maximum of 16) and allocated the number of console connections to each channel as appropriate.

Specifications

• Audio – I/O DB9 Socket: 4 wire full duplex, -30 dBm to 0 dBm, 300 Hz to 3.2 kHz, +/-0.5 dB flatness across band
• IP Interface – 10 Base/T RJ45 – UDP/IP
• Environment – 16Binary I/O
• GPS 1 PPS – 1 PPS Delivered to Solar via RS-422 or TTL Temperature – Operating: -10 to 60 ˚C, Storage: -25 to 85 ˚C Power Supply – 100-240 VAC 50-60 Hz, 10-36 VDC, 32-72 VDC
• Physical Dimensions – 19” rack, 30.5 cm deep
• Weight – TM – 3.5 Kg, NI – 3.3 Kg
• CE Mark – EN55022/24 & 61000-3-2/3
• FCC approval – 15B

Voting

Receiver selection or receiver voting is conducted in the digital domain by the TM using signal information passed down from the station interface. Due to the noise free nature of the digital link, no further signal evaluation is necessary at the TM which means that the IP data packets contain both the received audio and the signal level/ quality information together so voter risetime is the absolute minimum. Solar can accommodate either a ramping voltage or a set of tones as a source of RSSI signal.

Synchronisation

Synchronisation operates within 2 micro seconds compared with other base stations for both talk in and talk out directions. Switching the “vote” mid-transaction will only cause a disturbance of the input within the specified figure. Monitoring and control system configuration and status is available via a PC running the engineering terminal software supplied, and is connected either via USB or over the IP network to the TM. Standards based management is also available via the SNMP monitoring and control option to the TM allowing connection and sending of traps to a higher level management system. A closed contact summary alarm output is also provided on the central NI for connection to external alarm systems.

Solar 25

Simoco Solar 25 is the latest ‘Dalman Inside’ simulcast product to be developed by our specialist simulcast engineers at Dalman Labs. Leveraging over 25 years of dedicated simulcast engineering, research and development, Solar 25 now extends the benefits of Dalman’s revolutionary simulcast over IP to the P25 environment.

Solar 25 Economics

Simulcast technology synchronises duplicated channels in a wide area network to avoid interference between adjacent radio sites. Solar 25 Digital VoIP signals are better defined and more consistent than their analogue counterparts, enabling the synchronisation task to be ‘processor controlled’.

This advantage revolutionises the economics of simulcast deployment and support; enabling automatic set up and remote management to replace specialist knowledge, costly test equipment and reduced on-site maintenance. Simoco Solar technologies extend the benefits of simulcast by removing traditional barriers of cost and technology complexity for customers.

Specifications

• Audio I/O – DB9 Socket: 4 wire full duplex, -30 dBm to 0 dBm, 300 Hz to 3.2 kHz, +/-0.5 dB flatness across band
• IP Interface – 10 Base/T RJ45 – UDP/IP
• Environment – 8 Binary I/O
• GPS 1 PPS – 1 PPS Delivered to Solar via RS-422 or TTL Temperature – Operating: -10 ˚C to 60 ˚C, Storage: -25 ˚C to 85 ˚C
• Power Supply – 100-240 VAC 50-60 Hz, 10-36 VDC, 32-72 VDC
• Physical Dimensions – 19” rack, 30.5 cm deep
• Weight – TM – 3.5 Kg, NI – 3.3 Kg
• CE Mark – EN55022/24 & 61000-3-2/3
• FCC approval – 15B

Traffic Manager Capacity

A single Solar 2 Traffic Manager(TM) can accommodate a maximum number of 32 base stations with a maximum of 16 console interface connections by default. With the additional channel option, the user can select stations to form independent channel groups (to a maximum of 16) and allocated the number of console connections to each channel as appropriate.

Voting

Radio site voting is evaluated at the traffic manager. The use of IP links between the radio sites and the traffic manager gives consistent and characterized delivery of site signal quality information ensuring an accurate vote every time. Solar 25 can accommodate either a ramping voltage or a set of tones as a source of RSSI signal.

Synchronisation

Synchronisation operates within 2 micro seconds compared with other base stations for both talk in and talk out directions Switching the “vote” mid-transaction will only cause a disturbance of the input within the specified figure. Monitoring and control system configuration and status is available via a PC running the engineering terminal software supplied, and is connected either via USB or over the IP network to the TM. Standards based management is also available via the SNMP monitoring and control option to the TM allowing connection and sending of traps to a higher level management system. A closed contact summary alarm output is also provided on the central NI for connection to external alarm systems.