Cambium (CMBM) is a small networking equipment provider who has carved out a niche in tier-2 wireless networks and government/industrial networking applications. As such they operate "above the fray" in the tier-1 space where deals are larger but heavily discounted and "lumpy" in terms of sales.
That doesn't mean Cambium doesn't face competition - other vendors including Ubiquiti (UBNT) offer stiff competition. Cambium and Ubiquiti also have some ongoing legal disputes. However, the market is large and still underserved. At a high-level, Ubiquiti is more of a "DIY" equipment provider whereas . . .