Network Systems Solutions ® Providing the highest quality in structured cabling, network cabling, and structured wiring products such as keystone jacks. Cat3, Cat5e, Cat6 and Ca6A RJ45 50um Gold plated contacts. All our Keystone Jacks have been designed to meet the need for high-bandwidth applications. are engineered to exceed all TIA/EIA-568-B.2-1 permanent ink and channel level requirements. Our keystone jacks are fully tested. support T568A and T568B wiring, using an easy to read color-code wiring.