5 years ago

White Paper: Shortlinks Structured Cabling - Data Center - R&M

White Paper: Shortlinks Structured Cabling - Data Center - R&M

2. The wish for shorter

2. The wish for shorter links and the question of headroom Today, many users tend to shorten the links in order to save material, energy and costs. But what effect does this have on the performance and transmission reliability of the network? Shortening the distance between the two modules in a 2-connector permanent link results in a lower attenuation of the cable between the modules, which in turn increases the interfering effect of the further module. The standard, however, lists only one module in its calculation, which is problematic: Particularly, the limit values for NEXT and RL (return loss) can not be maintained any longer. This is why the standard defines a minimum link length of 15 m. What happens if a high quality module is paired with a high-quality cable? The result is a PL with much headroom in terms of length in the range between 15 m to 90 m. Using the R&M Advanced System for example, ensures a typical NEXT headroom of 6 dB with 15 m and 11 dB with 90 m (Figure 1). NEXT Headroom in dB Figure 1: NEXT headroom of permanent links, measured in an installation using the new Cat. 6A module of R&M. The zero line shows the limit value in acc. with ISO/IEC 11801 Amendment 2. In our R&Mfreenet warranty program, R&M guarantees a NEXT headroom of 4 dB for a permanent link of above 15 m, built with components from the R&M Advanced System. Alternatively, the high headroom provides customers with the possibility to set up very short PLs, which fulfill all the requirements of the standard ISO/IEC 11801 Amendment 2. White Paper | Short Links in Structured Cabling | v1.0 | ENG | Peter Fischer, Bruno Ritter 4

3. The advantage of additional headroom Basically, it makes sense to lay permanent links that are exactly as long as is needed. However, that would mean that the links would often be shorter than the minimum length of 15 m. When components are used that only meet the standard requirements, the permanent links must be artificially extended with loops to 15 m to make sure that the limit values are reached. This not only entails additional costs but these cable loops also take up space in the cable conduits and interfere with the ventilation, which results in an increase in infrastructure costs and energy consumption. Thanks to the large headroom with standard lengths, the use of R&M's Cat. 6A module allows a shortening of the minimum length as far as down to 2 m. This is sufficient to cover the customarily used lengths in data centers (Figure 2). On average, the cables between individual server cabinets and the network cabinet need to be 4 to 5 meters of length, if they are routed from above over a cable guidance system, or 7 to 8 meters if they are routed from below, through the raised floor. The loops to extend the cables to 15 m are not required when the Class EA / Cat. 6A solution developed by R&M is used. White Paper | Short Links in Structured Cabling | v1.0 | ENG | Peter Fischer, Bruno Ritter 5

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