Bison manufactures telecom enclosures at a competitive unit cost & rapid turnaround that are used in protecting electrical equipment. NEMA 1, 3R, 4 Designed with user convenience in mind, our cabinets provide easy access to all your telecom equipment for quick maintenance. Choose from a variety of sizes and. . With over 20 million enclosures deployed and more than 50 years of innovation, Charles is the communications industry's go-to source for enclosed solutions. Note: Product availability is real-time basis and adjusted. . As trusted network cabinet manufacturers, we're proud to present our top-tier fiber optic network cabinets. These network racks (cabinets) have the utmost precision and attention to detail.