Grades of Cabling
Grade 1 Outlet
To correctly install structured cabling in a home, it is necessary to follow accepted cabling standards that take into account what is commonly expected by homeowners for telecommunications uses.
The TIA-570-B standards specify two levels of cabling for each location. A location can consist of a single outlet, or a single room. It is permissible to break apart the cabling within a room or space to provide separate outlets, in other words a grade 2 cabling can be installed in a single or multiple outlets within a space. For example, the 4-pair UTP cable can be separated from the 75-ohm coaxial cable to create separate television and telephone outlets. The table below shows the grades of cabling specified by the TIA-570-B standard. The two grades can be described as:
Grade 1. This grade of cable provides a generic cabling system that meets the minimum requirements for basic telecommunications services. As an example, this grade provides for telephone, satellite, community antenna television (CATV) and data services.
Grade 2. This grade of cable provides a generic cabling system that meets the minimum requirements for basic and advanced telecommunications services, such as high-speed Internet and in-home generated video. This grade provides for both current and developing telecommunications services.
|Grade||4-pair UTP category 5e or greater||75-ohm coaxial cable||Fiber optic cable|
|1||1 cable||1 cable||1 cable (optional)|
|2||2 cables||2 cables||2 cables (optional)|
The standard also recommends using category 6 cable when possible rather than the category 5e, for the standard presented here we use category 6 for networking and category 5e for all other purposes. In addition, the de facto industry standard for 75-ohm coaxial cable is RG6 quad shielded. It is also important to distinguish the purpose of the cable by utilizing different color cables for specific purposes. The table below shows DIpartner’s recommended standards for cable colors for data, telephone, and video.
|4-pair UTP Category 5e||white||telephone|
|4-pair UTP Category 6||blue||networking|
|4-pair UTP Category 5e||yellow||video (head-end to display)|
|4-pair UTP Category 5e||green||video (source to head-end)|
|4-pair UTP Category 5e||orange||bi-directional audio|
|75-ohm coaxial RG6 QD||black||CATV, FM|
|75-ohm coaxial RG6 QD||white||satellite, in-house RF video|
Grade 2 Outlet
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