Side-by-side
Flexnet Modem (3G/4G) vs GS-21 Underground Sensor
Spec comparison for two products on Aviation Souk. Both compete in perimeter-security.
perimeter-security
Flexnet Modem (3G/4G)
by exensor
0.6 kg gateway-powered 3G/4G modem giving Flexnet sensor fields worldwide encrypted-VPN reachback.
perimeter-security
GS-21 Underground Sensor
by vortex-systems
Buried UGS with external seismic line-string support for extended pedestrian detection along a perimeter
| Cost of ownership | Flexnet Modem (3G/4G) | GS-21 Underground Sensor |
|---|---|---|
| Price tier | — | — |
| Lead time (weeks) | ?–? | ?–? |
| Delivery | — | — |
| Install | — | — |
| GCC airports deployed | 0 | 0 |
| Certifications | 2 | 0 |
Specs
Technical specifications.
| Spec | Flexnet Modem (3G/4G) | GS-21 Underground Sensor |
|---|---|---|
| Function | Extends Flexnet communications worldwide via 3G/4G cellular | — |
| Modem type | 3G/4G | — |
| Channel | Larger data volumes over a point-to-multipoint communication channel | — |
| Security | Encrypted VPN connection; AES-256 encrypted communication | Tamper switch |
| Power | Powered by connected Gateway; no battery or additional power supply required | — |
| Dimensions | 85 x 36 x 160 mm | — |
| Weight | 0.6 kg | — |
| Operating temperature | -32 to +71 degC | — |
| Environmental standard | MIL-STD-810 | — |
| EMC standard | MIL-STD-461 | — |
| Sensing modalities | — | External seismic line strings (pedestrian) + internal magnetic sensor (vehicle presence and travel direction) |
| External sensor inputs | — | PIR (pedestrian/vehicle presence + travel direction) and contact-closure |
| Radio | — | Built-in 5 W VHF, strong foliage penetration |
| Radio range | — | Up to 35 miles line-of-sight |
| Battery life | — | 1+ year |
| Output | — | Mechanical relay to trigger external devices (cameras, lights, sirens) |
| Timing | — | Real-time clock; programmable self-test messages and scheduled access windows |
| Compatibility | — | Legacy Vortex and Monitron systems |
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