There aren't many requirements for the Fiber Optic Splice Closure itself, but to make the fiber optic network run as efficiently as possible, choosing the right splice box for the network is a very important issue. The cable section from the front end to the hub or node box is very harsh. Pulling the cable from the climate-adjustable, fire-resistant front end to the trench or in the air will encounter dangerous weather, branches, chemicals, car accidents, excavators, animal bites, bullets, and other dangers. When the cable jacket is broken and the fibers are spliced ​​together, each fiber can pass through up to 25 fiber splice boxes. The connector box is not the same as the front end. There is no space for climate control and fire protection equipment. Generally, the door is not tight. However, people often hope that the connector box can accommodate and protect a large number of optical fibers like the front end, so the connector box becomes one of the most important linking devices in fiber optic equipment. 1. Development of joint boxes SCTE has not yet developed general technical requirements for joint boxes. However, the cable industry has learned a lot from telephone companies over the years. Prior to the advent of fiber optic cable, the internal standard for twisted pair cables required telecom operators to use packaged splice closures at the terminals. This standard was also adopted at the beginning of the cable, but it soon proved to be ineffective for the cable. The appearance of the inflatable sealed joint box eliminated the packaged joint box. In the early stages of the competition, people thought that inflatable sealed joint boxes could reduce costs. However, telecom companies are beginning to adopt sealed joint boxes that do not require a sealant and do not have to be inflated. The emergence of this technology led to the introduction of Bellcore's TR-771 specification. This standard sets forth uniform requirements for all fiber splice closures. The cable industry has adopted this standard. 2, the environment to use a large number of the optical cable to promote the development of the type of connector box. For example, the new GR-771 standard divides the application types of joint boxes into six categories: buried, underground, bracket, exterior, wireless, and interior. This standard is a useful tool for determining if a splice closure is suitable for a particular application. While some splice closures are only suitable for one application type, other splice closures may be versatile. Therefore, users should negotiate with the connector manufacturer according to their specific needs.