About SHIELD SOLO (formerly SOLO RED) 
Ensuring reliable communication for emergency personnel, the SHIELD SOLO public safety solution is a half-watt emergency radio communication system that delivers best-in-class talk-in and talk-out performance. An ERCES solution that fully complies with current fire codes, SHIELD SOLO is an Integrated Public Safety BDA that provides 700/800 MHz Land Mobile Radio (LMR) coverage in buildings up to 238,000 ft². This versatile system is available in Class A and Class B variations and accepts DC power from either the purpose-built SHIELD SOLO Battery Backup Unit (BBU) or a standard third-party BBU device. SOLO RED is easy to install, NEMA 4 rated, listed to UL 2524, and compatible with other public safety systems.

Advancing ERCES Public Safety Solutions


No Noise Guarantee: By monitoring environmental changes and performing automatic adjustments, SHIELD SOLO ensures emergency personnel stay connected in any situation by delivering industry-leading performance with a no-noise guarantee.

Automatic Setting of Uplink Transmitted Power: SHIELD SOLO simplifies the optimization of uplink (UL) gain for emergency communication systems by eliminating the need for additional equipment or guessing the calculations. The system calculates path loss automatically, allowing for different values according to network requirements and the option to set up a target range.
Automatic Calculation and Setting of Isolation & Downlink Gain: While isolation is calculated in real-time and automatically set at 20 dB per NFPA 1221, the system allows for different values according to local ordinances. DL gain is automatically adjusted to achieve the required value.
Industry-First Talk-Out Guarantee: CEL-FI ERCES solutions’ groundbreaking uplink (UL) test allows integrators to easily achieve industry-leading talk-out performance by measuring the signal traveling from the installation site to the remote tower via walkie-talkie. Using CEL-FI COMPASS and the CEL-FI WAVE PRO app, installers can test UL gain levels and view real-time analytics to ensure the best possible signal-to-noise ratio.
Built-in Grid Test Functionality: With CEL-FI WAVE PRO and CEL-FI COMPASS, system integrators can test the downlink (DL) gain for the design planning stage and post-install performance evaluation. Export the Full Signal Report as a .csv, which includes key LMR / Operator Network parameters: Operator, RSSI, RSRP, RSRQ, Frequency, Band, PCI, and more. Installers use system operation data to prepare for AHJ walk-through tests.
Built-in End-to-End Remote System Monitoring and Management: The web-based CEL-FI WAVE Portal provides installers and authorized users remote monitoring, managing, and control of CEL-FI ERCES systems from anywhere. In addition to easily adapting CEL-FI systems to local fire codes, the WAVE Portal allows users to customize notification and policy parameters. The intuitive platform also offers advanced performance metrics on CEL-FI solution’s individual components, including real-time high site-to-server antenna monitoring and donor signal quality reports.

SHIELD SOLO Components


  • ERCES Public Safety Solution: 0.5W Emergency Radio Communication System for 700/800 MHz LMR
  • Class A Device: 64 Channels at 12.5 kHz Bandwidth (Software Selectable)
  • Class B Device: 56 Channels at 100 kHz or 150 kHz Bandwidth (Software Selectable)
  • Large Coverage Area: Up to 238,000 ft² for Small-to-Mid Sized Buildings
  • No Noise Guarantee: Automatic Calculation and Setting of Isolation as well as Uplink and Downlink Gain
  • Talk-Out & Grid Testing: Industry-First Uplink and Downlink Tests via Cel-Fi WAVE PRO and COMPASS
  • IntelliBoost Chipset: Delivers Unparalleled Real-Time Talk-In & Talk-Out Performance
  • End-to-End System Monitoring: Built-in Remote Monitoring and Management via Cel-Fi WAVE Portal


Optional Components

SHIELD SOLO Battery Backup Unit (BBU)

The SHIELD SOLO Battery Backup Unit (BBU) provides constant direct current and battery charging capabilities for SHIELD SOLO ERCES Integrated Public Safety BDA systems.

  • Delivers Direct Constant Current to SHIELD SOLO and System Accessories, including the CEL-FI SHIELD SOLO Remote Annunciator Panel (RA), Emergency Power-Off Switch (EPO), and Active Server Antennas
  • Provides Backup Power for up to 12 or 24 Hours During Power Outages
  • Supports 12V Lead-Acid Batteries
  • Two Alarms Ports for Monitoring of the BBU


SHIELD Remote Annunciator (RA)

The SHIELD Remote Annunciator Panel (RA) provides automatic supervisory signals for malfunctions of CEL-FI ERCES public safety solutions. In addition to being NEMA 4 rated and complying with NFPA and IFC fire codes, the RA features PoE architecture for quick installation and alarm configuration with SHIELD EXTEND or SHIELD SOLO installations. The RA also offers real-time component monitoring through the CEL-FI WAVE Portal.

RED RA Data Sheet

SHIELD Emergency Power-Off Switch (EPO)

The SHIELD Emergency Power-Off Switch (EPO) instantaneously shuts down CEL-FI ERCES public safety systems from a single point, eliminating the risk of combustion caused by electricity or static. The EPO is designed to prevent inadvertent operation and can be installed in any location designated by the local Authority Having Jurisdiction (AHJ). In addition to being NEMA 4 rated and complying with NFPA and IFC fire codes, the EPO features PoE architecture for a quick installation and configuration with SHIELD EXTEND or SHIELD SOLO installations.

RED EPO Data Sheet

SHIELD Active Server Antenna (ASA)

The SHIELD Active Server Antenna is an active multi-frequency, omni-directional antenna for ERCES public safety solutions that require monitoring capabilities at the component level. In addition to being designed for hard cap and false ceilings, the Active Server Antenna features an N-type female connector and rugged IP20 grade electronics. The component is ideal for SHIELD EXTEND and SHIELD SOLO installations, which provide real-time antenna monitoring capabilities through the WAVE Portal.

RED ASA Data Sheet



SHIELD EXTEND is designed to provide consistent coverage in the most challenging building structures and to guarantee full compliance with the most current fire codes.

  • Class A with 56 Channels
  • Class B with 28 Channels (100 kHz & 150 kHz)
  • 700/800 MHz for Public Safety with dedicated FirstNet
  • Automatic Isolation
  • Automatic Uplink / Downlink Calculation
  • Talk-out Guarantee
  • Scalable All-Digital PoE
  • Built-in Remote Monitoring

Key Features

  • Concurrent FirstNet Cellular and Public Safety Radio In-Building Coverage
  • 3G / 4G / LTE / P25 / Analog
  • Cat 5 (Ethernet) RF lossless distribution
  • Support for all FirstNet LTE bands (2, 4, 14, 12)
    100dB gain

    • 21-23dBm UL power (depending on band)
    • 24dBm DL power per CU
    • Antenna pointing algorithm to optimize FirstNet donor signals
  • Support for 700 MHz and 800 MHz
    • 100dB gain
    • 26dBm UL power
    • 30dBm DL power (1W per band)
    • Class A device with up to 56 channels, 12.5kHz filter bandwidth
    • Class B device with up to 28 channels, 100kHz, 150kHz configurable via WAVE portal
    • System delay – approx. 35us@12.5kHz, 15us@100kHz, 13.6us@150kHz
    • Automatic UL and DL gain setting for Public Safety Channels ensure no interference of critical First Responder communications
    • Industry best Talk-In and Talk-Out performance due to real-time, slot-to-slot gain control
  • Total Power consumption (1x NU + 6x CUs) – 450W Max at 48V.
  • NEMA 4X Rated, UL 2524 compliant
  • Remote Management through WAVE Portal.

More Information

The SHIELD EXTEND Class A or Class B 700MHz/800MHz channelized Emergency Responder Radio Communications System (ERRCS) Smart Signal Booster was designed with the needs of First Responders, Building Owners, Installers, and Authorities Having Jurisdiction (AHJs) considered. The SHIELD EXTEND is a complete solution, each component fully-compliant with the current International Fire Code (IFC) and National Fire Protection Association (NFPA) standards.

As the public safety community evolves to include cellular LTE support, the SHIELD EXTEND is the only solution that offers true carrier-grade channelized support for FirstNet. Both LMR and LTE aggregated at the head-end, digitally-distributed over Category cable, and retransmitted through a single serving antenna or DAS field.

SHIELD EXTEND is the first and only solution in the market that can easily be scaled from a single donor “BDA” deployment at 1 or 2 watts to a full-blown (single donor) “Fiber DAS” up to 12 watts.

SHIELD EXTEND is best-in-class with 56 individually configurable channels (700MHz and 800MHz) and 1W downlink per Coverage Unit (CU) per band. Best-in-class channelized uplink squelch and channelized uplink automatic gain control (AGC), inherited from Nextivity’s carrier-grade LTE technology platform, unconditionally guarantees no interference to base stations and optimizes signal quality.

SHIELD EXTEND includes all standard alarms, supports all NFPA and IFC-required monitoring, and connects to Nextivity’s carrier-grade, SOC 2 (Type 1)-certified WAVE portal, providing best-in-class on-demand remote monitoring, not just for standard alarms but also to ensure system KPIs.

Where competing products require integrators to purchase pieces and parts from a variety of vendors to create a complete solution, the SHIELD EXTEND solution offers everything from the head end (Network Unit or NU), remotes (Coverage Unit or CU), Battery Back-up and Monitoring (MBBU), Remote Annunciator, Emergency Power-off Switch (EPO), and an As-Built Box. All NEMA 4X rated and optimized together.

Component Descriptions


SHIELD EXTEND Monitor & Battery Backup Unit

The Monitor and Battery Backup Unit (MBBU) is the central point of the CEL-FI SHIELD EXTEND system. It provides constant direct current, alarming, monitoring and battery charging capabilities. Integrates a wireless LTE modem and a wired Ethernet port for remote access to all the components via the CEL-FI WAVE Portal or the WAVE PRO app. Is NEMA 4 rated and UL2524 compliant. Two versions available to optimize power requirements and installation costs.


SHIELD EXTEND Remote Annunciator Panel

The SHIELD EXTEND Remote Annunciator Panel provides automatic supervisory signals for malfunctions of the ERRCS solution. Rated NEMA 4, it complies with Chapter 10 of NFPA 72 and section 9.6.13 of NFPA 1221. The PoE architecture allows for a quick installation and alarm configuration. The unit includes a FORM-C cable compatible with any fire alarm control panel (open or short circuits).


SHIELD EXTEND Emergency Power-off Switch

SHIELD EXTEND Emergency Power Off Switch (EPO) can instantaneously shut down the ERRCS solution from a single point to eliminate the risk of combustion caused by electricity or static. Designed to prevent inadvertent operation and can be installed in any location designated by the authority having jurisdiction.



The Network Unit (NU) processes FirstNet and LMR off-air signals digitally to provide reliable and interference-free coverage. PoE based architecture and CEL-FI patented algorithms for automatic setting of uplink and downlink gain, reduces time and cost of installation significantly, making SHIELD EXTEND the most compelling public safety solution in the market.



The Coverage Unit (CU) amplifies FirstNet and LMR signals up to 24 dBm and 30 dBm output power. The ease of installation plus the SelfOrganizing Edge Intelligence makes SHIELD EXTEND the most compelling solution in the market.



The CEL-FI QUATRA 1000 FN delivers FirstNet cellular coverage in buildings for emergency communications from police, fire, and medical personnel. CEL-FI coverage solutions for FirstNet are the best way to ensure coverage in an emergency situation. Communication is not optional in critical times, rely on equipment that ensures the best coverage.

Spotty cellular coverage, poor voice quality, dropped calls, and dead zones continue to plague occupants in middleprise buildings. The QUATRA 1000 FN is an Active DAS Hybrid that solves this problem. It is an affordable, all-digital solution. It provides uniform, high-quality cellular signal throughout a building, and is scalable to the size needed. CEL-FI products are carrier approved and guaranteed network safe.

Unlike older analog boosters and passive DAS technology, QUATRA 1000 FN delivers a cellular signal that is up to 1000x stronger, utilizing CAT 5e cabling for RF and Power over Ethernet, with no signal attenuation right to the perimeter of the building. QUATRA 1000 FN can be installed in just days (compared to months typical of other solutions), and at a price point that meets the middleprise budget.

The QUATRA 1000 FN Solution

The CEL-FI QUATRA 1000 FN delivers FirstNet cellular coverage in buildings for emergency communications from police, fire, and medical personnel. Cel-Fi coverage solutions for FirstNet are the best way to ensure coverage in an emergency situation. Communication is not optional in critical times, rely on equipment that ensures the best coverage.

Emergency communications from police, fire, and medical personnel are critical. The majority of cellular phone calls take place inside, but cell networks are outside. 80% of users inside complain of poor coverage or dropped calls. A building’s materials, while improving energy efficiency, will block or inhibit cellular service from the outside network. To exacerbate the issue, cellular coverage is increasingly not optional. Municipalities and government buildings need a high-quality FirstNet solution that can serve the middleprise and not take a year to deploy.

Nextivity is a member of the Safer Buildings Coalition, which is an independent organization that’s focused on advancing policies, ideas, and technologies that ensure effective in-building communications capabilities for public safety personnel and the people they serve.

Integrators and Carriers have partnered with CEL-FI to deliver a smart solution designed for middleprise buildings – CEL-FI QUATRA solutions.

  • CEL-FI provides the QUATRA BOM Estimator to help installers select the appropriate equipment in the right quantity, to eliminate the heavy cost / time of the planning effort.
  • CEL-FI ’s all-digital, scalable, PoE Cat5e solution makes it ideal for FirstNet environments.
  • CEL-FI  created a new solution category that combines its core technology with the architecture of an Active DAS - to deliver an Active DAS Hybrid – built for Installers.

Speed of Installation, higher quality in-building cellular solutions, and cost savings – are some of the reasons building owners, facility managers, and IT professionals are making the smart investment in the CEL-FI QUATRA solution.

A Solution for FirstNet Users

FirstNet is the cellular emergency response network being rolled out for Public Safety Communication Devices. This high-speed, nationwide wireless broadband network has dedicated bands for public safety agencies and first responders. Legacy equipment does not support FirstNet dedicated band.

CEL-FI QUATRA 1000 FN is designed to improve indoor signal coverage without any risk of interference on the mobile network. The QUATRA 1000 FN provides a sophisticated network-safe solution that has been engineered to deliver multiple levels of network protection:

  • Uplink power control to prevent desensitizing the network
  • Echo-cancellation and feedback control
  • Uplink muting, when handsets (UE) are not detected
  • Signal qualification (channels are individually qualified, so noise or very poor signals won’t be amplified and degrade the network)

The CEL-FI WAVE Platform cloud-based portal enables an operator to monitor equipment and network KPI’s, such as channel configurations, RSRP, RSCP, SINR, and systems gains, providing control and optimization insight.