Cellular Failover on a Mobile Security Trailer — The Connectivity Stack
A monitored security trailer is only as good as its connectivity. Guardtress trailers ship with multi-carrier cellular (Verizon + AT&T + T-Mobile) and satellite failover, delivering documented uptime above 99.7% across the Houston metro. The stack — SIM management, failover logic, satellite fallback — is what turns 'usually connected' into 'always connected.'
The three connectivity failure modes
Single-carrier outage: one carrier has a tower issue in your zip code. Common — happens 4–8 times per year per carrier per Houston zip.
Storm-driven multi-carrier outage: extreme weather damages towers or floods equipment. 2–5 times per year in the Houston metro at meaningful scale.
Site-specific dead zone: your specific ingress corner has weak signal on one carrier even when the metro is fine.
The Guardtress connectivity stack
Primary: bonded Verizon 5G modem with external antenna.
Secondary: AT&T 5G modem with independent antenna, hot-standby.
Tertiary: T-Mobile 5G modem for edge zones where AT&T is weak.
Quaternary: Starlink or Iridium satellite failover for total cellular outage.
Failover logic: sub-3-second automatic handoff, tested weekly.
- Primary: Verizon 5G
- Secondary: AT&T 5G
- Tertiary: T-Mobile 5G
- Quaternary: Starlink satellite
- Handoff latency: <3 sec
- Documented uptime: >99.7%
Why single-carrier trailers fail
A trailer with only one cellular modem is a trailer that drops offline during any single-carrier event. Some competitor units ship this way and it is invisible until an event.
Ask any prospective vendor to show 30 days of their uptime log. If they can't, that is your answer.
On-board local recording during outage
If all cellular and satellite drop simultaneously, the on-board NVR continues recording locally with 30 days of storage. When connectivity returns, footage syncs to cloud in the background.
You lose real-time monitoring during the outage window, but you do not lose the footage. And multi-carrier + satellite makes that window vanishingly rare.
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