One of the main elements of a telephone crossover is a plinth. This device performs the function of switching subscriber and connecting telephone lines. Externally, the plinth is a plastic case, on the front of which there are two rows of mortise contacts. There are 10 contacts in each row. Depending on the model and your preferences, you can choose plinths whose contacts are numbered from 0 to 9 or numbered from 1 to 10. This does not in any way affect the actual functionality of the device, and is intended only for the convenience of installers.

A specialist from the network equipment company https://e-server.com.ua will tell you about plinths.

10-pair plinth, non-opening, universal, num. 1...0

The specificity of contacts on plinths is that in order to terminate the conductor cores, it is not necessary to strip the insulation. Using a special tool, the cores are simply pressed deep into the contacts, and sharp knives these contacts cut through the insulation in in the right places and ensure reliable fixation of conductors.

EServer plinths are presented mainly in two types: openable and non-openable plinths. Openables work as follows. A cable is connected to it from behind, and its cores are distributed among the contacts along the subscriber lines. In non-opening versions, it is possible to install additional element– in particular, lightning protection.

The plinths differ, first of all, in the types of contacts. The 10 normally open plinth allows you to quickly connect linear circuits to terminal equipment. In the normal state, the conductors in such plinths are open, and special cords or plugs are used to switch them.

Normally closed plinths make it possible to obtain detachable connections. In this type, the contacts between pairs are in a switched state. But their connection can be easily broken using a special plug installed between the junction of the contacts. Plinths with normally closed contacts have a number of design features: The guide lugs make the termination of conductors much easier, and thanks to the labyrinth-shaped plastic protrusions, the conductor can be pre-fixed in them even without termination.

Plinth 10 pairs, openable, universal, num. 1...0

The 10-pair non-breaking plinth differs from others in that it provides a permanent connection that cannot be broken. In plinths with non-breaking contacts there is an additional branch contact. This contact is placed between each contact pair. It is designed for parallel connection of a control cord or arrester magazine, which allows you to protect the connection from overvoltage. To connect the grounding conductors, grounding strips are used. A ground wire is permanently connected to them, connecting it to the ground terminal.

To install telephone plinths, special boxes, cabinets or telephone boxes are used. Installation is carried out using special metal brackets (or, as they are commonly called, clamps). Depending on the capacity of the bracket, a very different number of plinths can be installed on it. But besides installing it on a bracket, there is another option - attaching the plinth both to the bracket and to special vertical rods with a leg diameter of 12 millimeters. After installing the plinth on the bracket, it can be fixed in the box for plinths. The box is a protected box equipped with cable entries and exits, as well as a lock.

The EServer telephone plinth is a quality product, allowing you to reliably switch connections in networks. Along with plinths, all the accessories necessary for stable operation of the network are also available for sale.

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Meaning of the word plint

plinth in the crossword dictionary

Wikipedia

Plint (telephony)

Plinth- the main switching unit of the telephone cross-country. Plinths are used for switching subscriber or connecting telephone lines. The plinth is integral part terminal cable device and is installed in telephone boxes, boxes and cabinets on mounting clamps. There are two types - openable and non-openable. The disconnectable plinth is designed not only for connecting, but also for protecting low-frequency cables of the telephone network. Has 10 pairs of nests. The cables are connected with outside plinth using special single-pair plugs, with inside telephone pairs are distributed according to subscriber numbers.

The plinth is plastic construction, in which a ten-pair cable is connected on one side, and on the other side, copper pairs are routed to specific subscribers. The design of the disconnectable plinth provides for the possibility of installing lightning protection.

Exist Various types plinths. The main characteristics of the plinth are the number of pairs, the type of contacts and the method of fastening in the cross.

Types of plinths by contact type:

open normally closed
openable normally open
non-opening

Plint (disambiguation)

Plint - the main switching unit of the telephone cross-country
Plinth- the lower part of the pedestal or column base in the form of an architectural break of the “shelf” type.

According to Dahl's dictionary, plinth is the same as plinth. According to some other dictionaries, the base of the column is not called a plinth, but a plinth. Traditionally, however, the shelf at the bottom of a column is called a plinth, and the similar structure along the wall is called a plinth.

At communications enterprises, as well as at other enterprises, when designing structured cabling systems (SCS), the question of selecting crossover equipment always arises. In this article we will try to give basic concepts on this issue.

Cross - this is a space (can be a room, a closet, etc.) designated for switching wires that are used in a telephone exchange, in a LAN or when laying optical communication channels.

For proper channel switching, there are many different types of devices, so in order to correctly select them and design SCS, you need to clearly understand what each device or system is needed for and how to correctly use and install it. Let us demonstrate this process using the example of equipment from one of the market leaders, Krone.

1. Types of crosses

So, you need to start purchasing equipment by choosing cabinets or racks for cross-connect equipment. They are open type(racks) or closed type(cabinets).

1.1. Closed crossovers (cabinets)

On sale you can find wall boxes, wall drawers, wall cabinets. They differ in capacity, purpose and type of fastening. For example, a box can be designed for a small capacity of up to 20 pairs, a cabinet - for a capacity of 100 pairs. These types of boxes, drawers and cabinets are attached to the wall. This equipment is manufactured in a special climatic design UHL category 3, that is, it is suitable for operation in moderately cold climates in indoors. Small-capacity boxes and boxes are used to create intermediate crossing nodes or to connect subscriber lines directly from devices to the cable network of a floor, building, or structure.

For sale wall cabinets, which are attached to the wall and installed on a special floor stand, which serves to protect the connected cables from damage. This cabinet arrangement greatly simplifies installation and renovation work on a cross-connection, the outer frame can be replaced without disconnecting communication channels. Typically, such wall-mounted cabinets are designed for a large capacity, for example, 1200 pairs, and are used for the transition from main communication channels to distribution ones.

Among the wall cabinets, you can also choose equipment that can be installed on outdoors in climatic version UHL-1. These cabinets use double metal carcass, i.e. there is an outer frame that protects from external mechanical damage and climatic influences and there is internal frame, in which the plinths are placed. Outdoor cabinets are equipped double doors with special secret locks that protect the cross from unauthorized access by intruders.

1.2. Open type crosses (racks)

Racks can be produced in the following design solutions:

A) wall rack, wall cross or wall frame. Such equipment is attached to the floor and to the wall;

B) wall cross or wall frame, it is attached to the wall;

IN) floor-mounted double-sided cross or double-sided floor stand: Attached to the floor and ceiling. This type of fastening allows personnel to access the crossbar from four sides.

Access of unauthorized persons to the premises where the racks are installed should be limited for security reasons.

1.3. Criteria for selecting crosses

Let us explain the situations when you should choose closed crosses, and when open crosses are also suitable. If, when developing a project, the customer sets you requirements for dust protection and moisture protection, then it is better to choose closed cross-equipment (cabinets). This also applies to the requirements for climatic performance (UHL-1, UHL-3), which we set out in previous section.

2. Skirtings

One of the main elements for installing cross-connect units is plinths; they are installed in cabinets and racks.

Plinth - this is a device in a plastic case that allows you to fix outgoing and incoming wires for switching channels using special clamps.

There are plinths with normally closed contacts and with non-opening contacts.

2.1. Non-opening plinth used in cross-connection to create a permanent connection.

2.2. In disconnectable plinths There are closed contacts that can be opened using a special device.

Also, plinths are also classified according to their steam capacity. They come in 5, 8 and 10 pairs. There are mainly 10- and 8-pair plinths on sale.

When selecting plinths, it is necessary to take into account the mounting options:

A) onto the mounting clamp,

B) on PROFIL rods,

B) on DIN rails,

B) universal.

Each plinth is marked with a special marking, for example, 2/10. This means that the plinth has 10 slots on both sides. But if it is additionally indicated in this way: 2/8x3, then this means that there are still 8 additional contacts for grounding the equipment.

2.3. LSA-PLUS technology

Krone has patented the LSA-PLUS technology. This technology allows you to very quickly attach the cable to the clamp. Moreover, this is done quite simply, without the use of labor-intensive soldering and screw connections, and in this case the specialist does not need to remove the insulation. This technology is considered throughout the world to be the most economical, easy to use, universal, fast and extremely reliable.

The basis of this entire system is the LSA-PLUS contact. With this connection, very high reliability and strength are achieved, even in the most unfavorable conditions environment such as humidity and corrosion, as well as exposure to strong vibration. The contact is installed quickly and accurately using a special tool.

3. Tools for working on cross-country equipment

As we already described in the previous section, in order to connect the cable to the clamp without using soldering, and also to eliminate the screw connection and not remove the insulation, specialists use a simple and inexpensive LSA-PLUS installation tool.

You can also recommend other tools to perform cross-crossing work (see the cross-crossing tool for more details). For example, percussion instrument, used for connecting cables to cross-connects. The tool is equipped with a rubberized handle and impact mechanism with adjustment, can be used instead of a screwdriver (equipped with a special hook for these purposes). Such a tool usually has a small LED flashlight built into it.

It also wouldn't hurt to buy installation assistance LSA-PLUS, which is used both for mounting clamps and for the LSA-PROFIL frame system, and for plinths.

4. Protection for plinths

Let's take a closer look at the technology for protecting plinths from overvoltage, which was introduced by Krone.

The basic principle of such protection is that all currents are diverted to the ground. There are differences in the principles of organizing this protection, depending on the types of plinths used. If plinths with non-breaking contacts are used, then protection devices can only be connected in parallel. Connection of the "series" type into the line of protective devices is available for plinths with contacts that are normally open.

4.1. In the case of using plinths with non-breaking contacts, it is mandatory to use only 3-point protection devices . There are such implementation options - the use of primary or coarse surge protection, it is also possible to use fine (secondary protection). It is important to know that such devices are only suitable for plinths with non-breaking contacts.

4.2. 5 point protection devices suggest the following mechanism of operation:

A) implementation of overvoltage protection together with current protection,

B) step-type protection, which implements a variant of primary and secondary protection in combination with current protection.

In plinths in which the contacts are normally open, it is allowed to install 5-point protection devices with the “series” type of connection to the line. Sometimes 5-point protection is used in plinths with contacts that are normally closed.

This protection technology, developed by Krone, is called ComProtect. To organize this technology in practice, integrated protection plugs are used. They provide peripheral and switching equipment, both primary and secondary overvoltage protection, and in combination with current protection. The plug is usually used to protect plinths.

How to choose plugs for protection? It is necessary to look at the operating voltage, both for the system being protected and for the plug itself. In principle, the protection does not have to operate in normal conditions functioning, because the protection system itself may be damaged, and the signal will not be transmitted through the cable system. We also advise you to pay attention to the “current protection” option, namely protection from the tail of the pulse. If the protection elements are overheated or overloaded, then you need to be very careful, as they can cause a fire or even a fire.

5. Components for cross-connect installation

In previous sections, we described in detail what plinths are and what they are needed for. But during installation, you will have a question: how to mount the plinths in a rack or cabinet? To do this, first of all, you will need:

5.1. Constructs for installation in a 19" cabinet (rack)

Distribution sections are needed for mounting LSA-PROFIL plinths in a telecommunications rack or cabinet. You need to select sections based on the markings of already purchased plinths, for example for 2/8 or 2/10 plinths. Also consider the number of floors of the racks. Look at the connection capacity of this section, i.e. How many plinths is it maximally designed for?

5.2. For mounting clamps LSA-PLUS type plinths are fastened; the clamps themselves are attached to the wall of the box or wall cabinet (closed cross-connection). The requirements for them are such that they must provide resistance to metal corrosion and increased stability for the entire structure. When choosing mounting clamps, you need to look at the depth of the cable compartment they are designed for and for how many plinths they are intended for.

5.3. Control cords are intended for connecting devices for checking telemetric parameters of the cable system.

5.4. Connecting cords necessary to combine different areas cable networks to the general global network, they are also used to connect terminal devices.

5.5. Plug assembly kit used for terminating control or connecting cords by specialists in order to create convenient (non-standard length) cords. It can also be used as a repair kit: if the plug on the control cord breaks, there is no need to throw away the cord and buy a new one; it is enough to purchase an assembly set of plugs and replace the failed plug yourself.

6. Accessory components for Krone installation

Let us briefly explain the purpose of some Krone components that may be useful to you when installing the crossover. There are components that perform an information or marking function. That is, with the help of such devices, an installation or repair specialist can easily determine the purpose of a particular cable, port, plinth, etc.

Marking cap necessary when marking wires in LSA-PLUS or LSA-PROFIL plinths and additional insulation of connections.

Modular frames Designed for marking rows and blocks.

Folding frames can be installed on LSA-PLUS or LSA-PROFIL type plinths and on surge protection magazines. The frames come complete with paper nameplates.

When assembling plinths, you will need the following auxiliary components:

Switching adapter- used as a switch that provides continuous connection of lines on plinths (LSA-PLUS/LSA-PROFIL) with non-opening and normally closed contacts.

Disconnect plugs you will need to disconnect circuits in LSA-PLUS or LSA-PROFIL plinths with normally closed contacts, and is also used in control adapters.

Dummy plug, as a rule, is used in circuit marking, therefore it is available in various color scheme. In addition to this function, it also protects against unauthorized access to the contacts of the plinths if non-breaking contacts are used. And in the case of using plinths with normally closed contacts, this plug prevents the circuits from opening.

Dustproof cap Mounted on top of plinths to protect against dust and dirt. In order to break the wires and connect to them, you need a disconnect adapter. It is used in plinths whose contacts are normally closed.

Remote semi-ring necessary in order to evenly install the plinths on special rods.

Nozzle for cable input (output) used for mounting clamps. Protects cable insulation from external damage.

Sets of inserts with numbers- these are marking products that inform specialists and are used in marking plinths.

Mounting adapters- auxiliary elements used in the installation of mounting clamps and rods.

For fastening various cables you always need to purchase a certain quantity special staples.

We hope that our article helped you in the difficult task of choosing equipment for installing a cross-connection. If you still find it difficult to classify and assign certain devices, you can always turn to the specialists of the SvyazKomplekt company for help.

The plinth is the main element of the telephone cross. The plinths are intended for switching subscriber or connecting lines of telephone networks. Each plinth is an element of a cable terminal device. It is installed in telephone boxes, boxes, and cabinets using mounting clamps. The world's leading manufacturer of plinths is German company ADC KRONE, engaged in the development and production of network communication equipment for high-speed transmission of digital, voice or visual data for corporate and private clients. ADC KRONE products are supplied to more than 150 various countries peace. ADC KRONE's customers include operators of fixed and mobile telephone networks, as well as all those enterprises and organizations that wish to implement high-tech intradepartmental telecommunications solutions.

According to the type of contact, Krone plinths are divided into open and non-open. Krone openable plinth intended not only for connecting, but also for protecting low-frequency cables of communication networks. It has 10 pairs of nests. The cables are connected from the outside using special single-pair plugs, while on the inside of the plinth the telephone pairs are separated according to subscriber numbers. The design of the Krone disconnectable plinth provides the option of installing lightning protection. Buy Krone plinths It is possible not only in many specialized stores, but also on the Internet.

To potential clients those who wish buy Krone plinths, a wide range of products is offered, the most popular types:

Breakable plinth 2 10 Krone with normally closed contacts - plinth with normally closed contacts for 10 telephone pairs. It contains circuit breaking contact elements electrical connection. It is possible to monitor circuits in both directions, as well as the ability to install integrated protection elements;

The 2 10 Krone universal release strip is similar to the previous model. Differs in installation versatility: can be installed on mounting rods and mounting clamps;

Breakable plinth 2 10 Krone category 5e - with normally closed contacts. Designed for 10 pairs. Designed for a center-to-center distance between mounting rods of 95mm;

LSA-PLUS skirting boards It is considered to be the main switching unit of telephone cross-connect equipment. Structurally, the plinths are two rows of open or non-open contacts enclosed in a common compact housing made of thermoplastic polyester (polyester), which is both a non-flammable structural and good insulating material.

Decades ago connections in major crosses, distribution cabinets, cable termination devices were mainly made using screws and soldering. With the advent of plinths using the mortise contact technique, the latter began to displace screws and soldering from the main cross-connections, and then, as their popularity grew, in distribution cabinets and subscriber boxes. Ultimately, LSA-PLUS plinths became the de facto standard for telecom operators' telephone switching and distribution infrastructure.

With the development of the LSA-PLUS ® contact, ADC KRONE, a pioneer in the field of mortise contact technology, has become a trendsetter on the global market. Currently, many manufacturing companies produce analogues of the popular ADC KRONE products. These are mainly openable and non-openable plinths, mounting clamps, 19" mounting frames, sensor tools, distribution boxes for installation inside and outside buildings. However, analogues of ADC KRONE equipment for solving large-scale problems of telecom operators can hardly be found, because because large operators mostly prefer only original ADC KRONE equipment.

Classification of LSA-PLUS plinths by contact type

Based on the type of contact, plinths can be divided into two large classes: openable and non-openable. Opening plinths, in turn, can be either with normally closed contacts or with normally open contacts. Quite often, customers who are uninitiated in all the intricacies get confused with the identification of plinths with a certain type of contact due to the fact that suppliers use different names for the same type in their price lists. The visual classification of plinths given below allows you to remember their main types.

It is worth noting that professionals only need one glance to visually determine the type of contact of the plinth. The fact is that the manufacturer took care of this - the plinth cases differ in color depending on the type of contact.

Table No. 1. Match the color of the case and the type of contact of the plinth.

Non-breaking plinths LSA-PLUS (connection module)

The contacts of non-breaking plinths are constantly closed, due to the fact that they are stamped from one continuous metal plate. One row of pins is the cable side, and the second row, labeled 0 to 9 or 1 to 0, is called the crossover/subscriber side. The middle row of contacts provides the possibility of: a) parallel connection for measurements; b) installation of surge protection elements.

LSA-PLUS disconnect strips with normally closed contacts (disconnection module)

Unlike plinths with non-opening contacts, the contacts of these plinths are also closed in the initial state, but if necessary they can be opened using a special plug or plug. By opening the contacts of the plinth using a test cord, you can: a) break the electrical circuit, b) test or measure the circuit in two directions, c) install elements of complex electrical protection. Two rows of contacts located opposite each other are used to connect the cable and cross-connect/subscriber side.

LSA-PLUS disconnect strips with normally open contacts (disconnection module)

LSA-PLUS 2/10 strips with normally open contacts are used primarily in combination with electrical protection components. In the initial state, the contacts of the plinth are open. LSA-PLUS 2/10 strips with normally open contacts provide the ability to connect up to 20 pairs, depending on the application.

vendor code	Name	Price
TWT-LSA10P-DIS-09		126.75R.
TWT-LSA10P-DIS-10		126.75R.
TWT-LSA10P-DIS-Q		158.27R.
[~model=22845~]	[~link=22845~]	[~price=22845~]
[~model=32050~]	[~link=32050~]	[~price=32050~]
[~model=44064~]	[~link=44064~]	[~price=44064~]
[~model=70887~]	[~link=70887~]	[~price=70887~]
6089 1 102-06		310.00R.
6089 1 121-06		300.00R.