Specifications
- Access radios
- Three 5 GHz 802.11ac radios, 120° sectors
- Backbone radio
- 60 GHz 802.11ad, up to 1.8 Gbps at 300 m
- Capacity
- Up to 60 Stoops per hub
- Switching
- Managed gigabit switch, four PoE outputs
- Power input
- 48 V DC from the Cellar module, or mains
- Power draw
- 38 W typical, 55 W peak
- Backup
- Cellar C3 battery module, about nine hours
- Enclosure
- Powder-coated aluminum, IP66, with lightning protection
- Mounting
- Non-penetrating roof frame or wall bracket
- Parts cost
- About $1,450 including the battery module
Notes
Hubs go on the tallest buildings a network can get permission to use: libraries, churches, schools, housing cooperatives and public housing towers. Every hub site is covered by a written agreement, and most are given free of charge.
Each hub reports its battery state with every poll. A hub that switches to battery shows as degraded here until mains power returns.
In service
221 units across 64 networks, by revision:
- 23 H3
- 94 H4
- 104 H5
Revision history
Higher-gain sector antennas, remote power cycling of each output and a redesigned frame that two people can carry up a ladder in pieces.
Moved the backbone to 60 GHz and the battery to the new Cellar module. The pre-climb checklist, which installers call the litany, is now printed inside the enclosure lid.
Added a 24 GHz backbone radio, which let hubs link directly over longer distances and cut the number of relays most networks needed.
Purpose-built sector radios and a managed switch. The car battery gave way to a sealed lead-acid pack in its own enclosure.
Built for Lister Flats, the first network designed around hubs: three repurposed Stoop radios on a steel frame, with a car battery in a cooler for backup.