Modernization of automatic telephone exchanges. SMT assembly Electronic Systems

Today, the telecommunications services in the Ukraine and other CIS countries are mainly provided by electromechanical automatic telephone exchanges (EATE) which have been under operation for more than 20 years. The quality of communication provided by these exchanges cannot meet the current requirements defined for this industry. The relay equipment requires replacement or repair due to its wear. In addition, the existing quantity of telephone numbers is not enough for many places and providing additional telephone services (ATS) becomes more and more popular. There is also a problem of absence of Automatic Message Accounting System and Automatic Telephone Number Detection System at many automatic telephone exchanges. All of these factors encourage the operators to look for the solutions of these problems by upgrading the existing equipment.


There are three main ways to solve these problems:

The first way is a so-called 'bulldozer technology', i.e. it is a complete replacement of the EATEs with the modern digital automatic telephone exchanges (DATE). This method significantly expands the number of services provided to the subscriber and essentially improves the quality of communication and reduces the power consumption. 

However, this method requires considerable costs (it will take more than 15 years to recover the cost of the new DATEs). Furthermore, the DATEs offered by foreign and home manufacturers require in most cases the replacement of the existing cable sets and disconnection of the subscribers sharing the same telephone line.

The second way relates to coordinate exchanges only (the ATEs of the following types: ATSK, ATSKU, ATSK 100/2000, PSK 1000) and provides for the replacement of the relay cord sets, registers, termination relay connecting lines etc. with the identical electronic ones. This method improves the quality of communication but the increase in the number of services is negligible. The power consumption of the automatic telephone exchange is still the same and in future it will become necessary to replace the EATE with the modern exchange and it will turn out that the money spent for upgrading has been wasted. Moreover, this method does not solve the problem of transition to the modern signalling systems. On the one hand it may seem that this way requires minimum investments but using a simple calculation it can be seen that a full replacement of the registers, cord sets and termination relay connecting lines only will cost the operator about $50 per telephone number. 

The third way is to upgrade the EATE by replacing the relay group equipment with the digital switching system. The costs required for this way are 5-6 times less than the costs required for the first way and 2 times less than those for the second one. This method does not require disconnection of the subscribers sharing the same telephone line and reduces the power consumption by 2-3 times. Upon the completion of upgrading the subscribers are provided with the quality of communication and set of services that can be compared to those of the DATE. The full diagnostics of the remaining relay equipment facilitates the operation of the automatic telephone exchange. In future, it may be possible to gradually replace the remaining relay equipment with the digital one. After the exchange is upgraded it is similar to the DATE on the interexchange level and provides all of the functions the DATE features.

Since 1998 our company has been upgrading EATEs using the second and third ways. We consider the third way to be the most promising on the markets of Russia and Ukraine. 

Our company has designed and certified the Connection Routing Equipment (CRE).

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