Cel-Fi QUATRA Active DAS Installer, Atlanta + Southeast US

What QUATRA is, architecturally

Cel-Fi QUATRA is the active distributed antenna system in Nextivity's product line. It diverges from the rest of Cel-Fi in one important way: instead of a single head-end booster feeding a passive coax DAS, QUATRA uses a Network Unit at the head end that runs structured cabling — Cat6 for QUATRA 4000, fiber or Cat6A for QUATRA EVO — to multiple Coverage Units distributed across the building. Each Coverage Unit re-amplifies the signal at the antenna, which is the architectural reason QUATRA preserves output across very long pathway runs where a passive coax DAS would drop the signal below usable levels.

The practical implication: a QUATRA system can cover floor plates from 50,000 sq ft up through 500,000+ sq ft per system, with even per-antenna output across the entire building. Multi-floor towers, sprawling distribution warehouses, healthcare campuses, hospitality with deep room counts — all the building geometries that defeat a passive DAS.

QUATRA 4000 vs QUATRA EVO

The two QUATRA generations target different deployments. JBT typically scopes QUATRA EVO for new construction and major refurbs and QUATRA 4000 for retrofits where existing Cat6 infrastructure can be leveraged.

QUATRA 4000

• Cat6 backhaul from the Network Unit (NU) to each Coverage Unit (CU)
• Up to 32 Coverage Units per NU
• Power and signal carried over the same Cat6 — no separate power run at each CU
• Per-CU output suitable for typical 25-100 ft antenna radius
• Best fit: retrofits where Cat6 pathway already exists, multi-floor offices, mid-size warehouses

QUATRA EVO

• Cat6A or fiber backhaul, higher signal capacity, longer pathway reach
• Larger NU capacity and higher per-CU output power
• Optional integrated Wi-Fi 6 / Wi-Fi 7 access point at the CU — same infrastructure delivers both cellular DAS and Wi-Fi
• Per-CU output suitable for very large floor plates and longer antenna radius
• Best fit: new construction, healthcare, hospitality, very large warehouses, any project where consolidating cellular + Wi-Fi reduces low-voltage infrastructure cost

For the broader Cel-Fi product strategy and where RS3 vs QUATRA splits, see our Cel-Fi installer overview and the RS3 installer page.

Why active DAS instead of passive

The single technical reason: passive coax DAS link budget runs out. Every component between the head-end booster and the most-distant indoor antenna costs decibels. Long coax runs lose signal per 100 ft. Hybrid couplers lose 3 dB per port. Splitters lose 3-7 dB per output. Connector and termination losses add up. On a 100,000 sq ft floor plate, a passive DAS would need to push 30+ dB through the worst-case pathway, leaving the most-distant antennas with output too low for usable indoor coverage.

Active DAS solves this by re-amplifying at the antenna. The Cat6 or fiber backhaul from the NU to the CU only needs to carry signal that the CU will boost again before transmitting it. Per-antenna output stays uniform across the building regardless of pathway length. The trade-off is cost — active DAS needs structured cabling and CU power — but for buildings where the geometry demands building-wide coverage, it's the only architecture that delivers it.

What a JBT QUATRA deployment looks like

A typical QUATRA project runs 6-12 weeks from contract to commissioning, with the field installation phase running 1-3 weeks depending on Network Unit count, CU count, and ceiling/pathway access.

1. Site survey + design. Field engineer measures donor signal RSRP / RSRQ at proposed donor-antenna locations, walks the interior to map dead zones, and assesses the structured cabling pathway. We propose a head-end NU location, CU count and placement, backhaul cabling pathway, donor-antenna site, and the carriers to cover.
2. Engineered design package. Heat-map prediction for each carrier across the full floor plate, NU + CU placement drawing, Cat6 / Cat6A / fiber pathway drawing, bill of materials, power calculation, and the per-zone dBm coverage commitment. Customer signs off; JBT orders hardware.
3. Installation. Roof or wall donor-antenna mount with weatherproofing and grounding, coax pull from donor to NU, NU installation in head-end telecom room, Cat6 / Cat6A / fiber pull from NU to each CU location, CU mounting at each cellular antenna location, optional Wi-Fi 6/7 AP at each CU (QUATRA EVO), and final pathway certification.
4. Commissioning + carrier activation. QUATRA system paired to the Nextivity WAVE portal, per-carrier registration filed (AT&T, Verizon, T-Mobile, FirstNet), and JBT walks the full floor plate with calibrated RSRP measurements at every CU antenna to validate the predicted heat map. Final acceptance report delivered to customer.

Multi-carrier QUATRA

Each QUATRA Network Unit supports one carrier. Multi-carrier deployments stack NU head-ends per carrier and share the CU and structured cabling infrastructure through engineered hybrid couplers. The most expensive line items — the building-wide Cat6 / fiber pathway, the CU mounting infrastructure, the donor antenna real estate — get amortized across the carriers, so adding a second or third carrier doesn't 2× or 3× the project cost. For a typical Atlanta three-carrier QUATRA deployment, JBT delivers the install at roughly 1.7-2.2× the single-carrier cost.

Building types where QUATRA wins

JBT's repeat QUATRA customers fall into a few patterns:

• Healthcare campuses. Lead-shielded imaging suites, deep interior corridors, basement procedure rooms. QUATRA EVO with integrated Wi-Fi handles both clinical Wi-Fi and the staff / patient cellular coverage on the same infrastructure.
• Multi-floor office towers. LEED-glass envelopes that block 90%+ of carrier signal. QUATRA delivers uniform per-floor coverage with a CU on each floor mid-corridor.
• Distribution and manufacturing warehouses. Tilt-up concrete or pre-engineered metal, where forklift drivers and floor managers need reliable push-to-talk over carrier. QUATRA 4000 over Cat6 covers floor plates that passive DAS can't reach.
• Hospitality. Long room corridors with masonry firewalls between units. QUATRA EVO with Wi-Fi integration consolidates cabling.
• FirstNet-priority sites. Public safety subscribers (fire stations, EMS, command-and-control sites) where reliable FirstNet coverage drives the system. QUATRA + FirstNet head-end is the standard JBT recommendation.

QUATRA vs traditional carrier active DAS

The other active-DAS architecture in the market is the traditional carrier-built active DAS using CommScope ION-E, Corning OneWireless, or SOLiD's platform. Those systems require a direct carrier signal source (a small cell, a BTS hotel, or a fiber-backhauled donor) and carrier capacity planning, which means multi-million-dollar projects coordinated by the carrier's RAN team. Appropriate for stadiums, airports, very large convention centers, and Tier-1 commercial real estate. For everything else — including commercial real estate up to 500,000 sq ft — QUATRA delivers active-DAS coverage off-air at a fraction of the cost. For the side-by-side decision matrix, see our Cel-Fi QUATRA vs traditional active DAS comparison.

WAVE monitoring and post-commissioning support

Every QUATRA system JBT commissions comes online inside the Nextivity WAVE cloud portal. WAVE gives JBT remote visibility into the NU and every CU, per-CU signal levels, gain, fault counters, and pathway alarms. JBT support agreements bundle WAVE monitoring with annual signal-level audits and prioritized dispatch. For mission-critical sites (hospitals, warehouse-distribution, FirstNet-priority), we recommend a JBT extended service agreement that includes proactive dispatch when telemetry shows degradation before the customer feels it.

Cat6 vs fiber backhaul: pathway decisions

The choice between Cat6 (QUATRA 4000), Cat6A (QUATRA EVO), and fiber (QUATRA EVO) is driven by pathway distance and existing-infrastructure leverage. Cat6 limits the NU-to-CU run to roughly 100 meters per segment, which works cleanly on single-floor large footprints and most multi-floor buildings under five or six stories. Cat6A extends per-segment reach and adds bandwidth headroom for the integrated Wi-Fi 6 / Wi-Fi 7 AP on QUATRA EVO. Fiber removes the distance constraint entirely and is the right choice for very tall buildings, sprawling campuses, and any deployment where the NU has to live far from the CUs (often because the head-end telecom room is in a basement and the CUs are on upper floors).

For retrofit projects with existing Cat6 already in place, JBT often leverages the structured cabling that's already there for the QUATRA backhaul. The pathway-certification step at commissioning catches anything substandard and we replace only what doesn't pass — usually a small subset of the existing runs — rather than re-cabling from scratch. The cost savings on a retrofit can be material.

Atlanta service area

JBT installs Cel-Fi QUATRA across the Atlanta metro and the Southeast US — Georgia, Alabama, Tennessee, South Carolina, North Carolina, and Florida. For nationwide public-safety BDA work, see our SHIELD ERCES installer page; QUATRA is commercial cellular and operates under the regional commercial service area. For the broader JBT DAS practice, see the DAS / in-building cellular service page.

Frequently asked questions

Call (770) 637-2094 to scope a Cel-Fi QUATRA active DAS deployment in Atlanta or anywhere across the Southeast US, or see the DAS / in-building cellular service page for the full JBT DAS practice.