Design and selection of cabling system in open office area

As you know, wiring standards for the structure of its system has a clear and detailed provisions. For example, it is stipulated that the wiring system should be a layered star-like topological structure; for example, specify the link from the socket to the horizontal wiring between the work area (link) whether copper or optical cable, length can not exceed 90 meters, the two ends of the length of the soft jumper can not be added to more than 10 meters; in the past, The standard also stipulates that links can not be renewed, interactive connection, cable must be uninterrupted from the horizontal wiring to the work area outlet.

However, this provision in practice due to the characteristics of the modular office furniture gradually led to problems. Modular office furniture to form an open, relatively independent space, so that the same floor space without real walls, decorative wall permanent or semi-permanent isolation, can also be easily reconfigured, combined, as needed, and thus eventually become a part of all office areas irreplaceable. Whenever modular office furniture is reconfigured, combined, or even increased, the wiring system associated with it must be restructured accordingly. But by the pipeline, the length, the route and so on all sorts of restrictions, utilizes the existing cable and the new cable cannot keep up with the office furniture the change. So open Office Area Wiring System specification TSB-75 came into being. In the updating of cabling system standards, this is more a requirement for adapting to the environment than a specification driven by pure technology development.

A careful analysis will reveal that from the horizontal wiring to the work area sockets of the cable routing, from the horizontal wiring to an open office area is a fixed part of the front; access to open office areas, especially after modular office furniture, to the work area socket is likely to change. TSB-75 allows the cable to be at the junction of these two parts, which I call, "pause" to reasonably separate the fixed part from the changing part. /upimg/allimg/070602/303.gif

There are two specific ways to do this. One, dense user socket (Multi-user-telecommunications-outlet,muto). That is, the socket back to the two parts of the junction, such as the Open office area of the wall, the carrier pillar of the outsourced decoration, using a long work area jumper to lead to modular office furniture desktop. When the modular office furniture is reconfigured, assembled, or added, reorganize or add the corresponding work area jumper. As shown in the following figure.
　
TSB-75 This changes the allowable length of the link to the work area jumper, as shown in the following table.

Horizontal laying cable work area jumper wiring between jumper + work area jumper
Max Length (m) Maximum cumulative length (m)
90 3 10
85 6 13
80 9 16
75 13 20
70 16 23
65 20 27

Second, turn contact (consolidation point, CP). That is, the junction of two parts to add devices, such as Molex Enterprise Wiring Network Department produced Katt 601 Junction box, the horizontal laying of twisted-pair wire disconnect, and then continue; the work area socket is still on the furniture, the work area jumper is still the general length, that is, the link length from the horizontal wiring to the work area outlet is not more than 90 meters, The jumper lengths on both ends cannot be added more than 10 meters. When modular office furniture is reconfigured, assembled, or increased, the horizontal laying of twisted-pair wires is reorganized or added to the socket between the working areas. Also shown in the following figure. The location of the transfer, except for the above premises, is also common in ceiling ceilings.

Some experienced people in practice may have unconsciously TSB-75 the way to solve the problem, but better in the current norms under the support of the implementation. Here, mention some of the issues that should be noted in the design application to the Open Office area Wiring System specification.

The dense user socket way and the turn contact way between the two, the Molex Enterprise Wiring Network Department is apt to turn the contact way.

In particular, these two approaches must not be mixed at the same time.

However, links with Muto or CP can indeed be mixed with links that do not have Muto or CP. For example, some end users will be in an open office area surrounded by a closed circle of office, the supply of executive-level staff dedicated to the use of the Open office area for ordinary employees. This closed office will be applied to links without Muto or CP, and the Open office area will apply to links with Muto or CP, all from the same horizontal wiring.

The application of the TSB-75 specification is the choice of the usual standard when it does not meet the requirements of the situation, rather than a priority design consideration. For example, this is definitely not a theoretical basis for supporting the simple continuation of an extension of a cable to a point where the length of the message is insufficient. When the cable is not long enough for a certain information point, the only right way to do that is to pull the cord back as soon as possible.

Test in the contact mode, the entire link, from the horizontal wiring between the socket to the work area, including rotary contact, the link link parameters.

Some of the information mentioned in the five cases, from the horizontal wiring to the Muto or CP parts can be considered to lay 25 pairs of twisted pair, I personally think it is undesirable. I am opposed to the use of multiple logarithmic twisted pair in any structured wiring system. Always use 6 4 pairs of twisted pair to replace 1 25 pairs of twisted pair, which is more standard, better performance, and may cost less.