AT&T Fiber & Connectivity
Unstable Internet Is Killing Your Business. Here's How to Fix It in SoCal.
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Your Business Keeps Running. No Matter What.
June 15, 2026
· AT&T Fiber & Connectivity
Internet is your business infrastructure. When it goes down, everything goes down — all at once.
The Setup
One Outage Stops Everything. Failover Keeps It All Running.
01 / Primary
AT&T Fiber
Your main connection. Consistent speeds, low latency, ideal for POS transactions and cloud-based POS sync. Prioritize a dedicated business line — not shared residential.
Low latency02 / Backup
5G Cellular Backup
Kicks in automatically when fiber drops. Modern 5G connections in San Diego sustain the throughput needed to keep Clover running during outages.
Auto-failover03 / Control
UniFi Failover Logic
UDM Pro monitors both connections continuously. When latency or packet loss on fiber crosses a threshold, traffic shifts to 5G — silently, in seconds.
Sub-5 sec switchReal Story · Los Angeles 2026
When Internet Goes Down, Your Entire Operation Goes With It.
LISTICLE
Clothing Wholesaler
2310 E Washington Blvd · Los Angeles, CA 90021
MKR SYSTEMS CLIENT · FASHION DISTRICT
APR
April 2026 · No Failover Installed
AT&T fiber physically severed — 6 hours of downtime
Urban infrastructure work on E Washington Blvd cut the AT&T dedicated fiber line. At the time, Listicle had no backup connection. The result: 6 full hours of complete business shutdown — no card payments, no online orders, no VoIP phones, no inventory system. Staff couldn't process a single transaction until AT&T restored the line.
6 HRS DOWNTIME
NO BACKUP · FULL SHUTDOWN
⚡
MKR Systems Response · Immediately After
MKR Systems installed AT&T Internet Air (5G cellular backup) and configured automatic failover through the UniFi Dream Machine Pro. If the fiber goes down again, the router switches to 5G in under 5 seconds — on a completely separate physical path that no street-level cut can touch. Listicle would never lose another operating day to a fiber cut.
MAY
May 2026 · Failover Active
Same corridor. Same cable cut. Zero downtime.
One month later, the same stretch of fiber was severed again. This time, the UniFi router detected the cut and switched to AT&T Internet Air in under 5 seconds. Listicle processed every order, answered every call, and recorded every camera frame — without interruption. Staff didn't notice anything had happened until MKR called to confirm.
0 MIN DOWNTIME
FAILOVER IN <5 SEC
Everything that depends on your connection
💳
POS & Payments
No card processing. Cash only — or closed.
📱
Online Orders
DoorDash, Uber Eats, website — all dark.
📞
Phones (VoIP)
3CX and all VoIP calls drop instantly.
🖥️
KDS & Kitchen
Ticket display goes dark. Manual chaos.
📦
Inventory System
Cloud-based stock management offline.
📷
Security Cameras
Remote monitoring and alerts stop.
Failover Triggers Before You Notice a Problem.
UDM Pro — Continuous WAN Health Monitoring Loop
Every few sec
Ping targets
Pings external targets on both WAN connections simultaneously
→
Measure
Check SLA thresholds
Latency, packet loss, jitter vs. per-uplink thresholds you define
→
Threshold crossed
Primary degraded
Latency spikes, packet loss rises, or connection drops — trigger fires immediately
→
<5 seconds
Route to 5G Backup
All traffic shifts to 5G/LTE. Clover, phones, KDS continue without interruption
When primary recovers and is stable, UDM Pro automatically routes back to fiber.
The entire process — failover and recovery — happens
without any human intervention and without any visible disruption to devices on the network.
MKR Systems configures your SLA thresholds during installation and
monitors all failover events via Uptime Kuma on our private cloud.
Combined Availability Math — Dedicated Internet + Internet Air
AT&T Dedicated Internet SLA: 99.95% uptime
AT&T Internet Air (cellular): 99.0%+ typical uptime
Physical infrastructure: Completely independent (fiber vs. cell towers)
Combined availability:
P(both down simultaneously) = (1 − 0.9995) × (1 − 0.99)
= 0.0005 × 0.01 = 0.000005
Combined theoretical uptime: 99.9995%
Annual allowable downtime: ~2.6 minutes/year
vs. single connection (99.95%): ~4.4 hours/year of exposure
Sources: AT&T Dedicated Internet SLA — attbusinessbundle.com ("99.95% data delivery, 100% uptime guarantee");
AT&T Internet Air cellular typical uptime; standard parallel-system availability algebra.
Actual results depend on location, AT&T network conditions, and UDM Pro configuration.
References & Data Sources
- [1]Ubiquiti — UniFi Dream Machine Pro Specifications — Failover configuration, WAN failover settings, and traffic management documentation. help.ui.com/hc/en-us/articles/360050864513
- [2]AT&T Business — Internet Air Product Overview — LTE/5G business internet for commercial locations without fiber infrastructure. www.att.com/internet/business-internet/
- [3]Clover / Fiserv — Network Requirements for Clover Devices — Official Clover network connectivity requirements including DNS and latency specs. www.clover.com/en-US/help/network-requirements
- [4]PCI Security Standards Council — Network Segmentation Guidance — PCI DSS v4.0 guidance on network segmentation for cardholder data environments. www.pcisecuritystandards.org
MKR Systems, Inc. is an authorized Fiserv / Clover reseller and AT&T Business agent serving Los Angeles, Orange, Riverside, and San Diego counties. All analysis, recommendations, and cost models in this article are independently produced by MKR Systems based on publicly available data and our direct operational experience. Pricing and product specifications are current as of publication date and subject to change.
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