Compliance of series/parallel protections for Telecom CO

ST and Cooper Bussmann, experts of wireline networks protection, have jointly prepared this application note to present a full protection solution based on companion devices from both companies.

Even with all the wireless telecommunication options (GSM, DCS, PCS, UMTS, Wi-Fi, etc…), the wireline network remains the most cost effective wide range solution to exchange data over the world. The use of this copper carrier requires system designers to provide adequate protection against overvoltage and overcurrent events occurring on the line. The goal of this document is to provide telecom system card designers the necessary information to make proper protection choices.

An example of a wireline telecom network is shown in figure 1. Two different kinds of equipment are connected together by means of a copper line. One line termination is connected to the Central Office (CO) while the other is connected to the terminal. In the CO, the line goes through the Main Distribution Frame (MDF), which connects network to the signal cabinet, and is then connected to a subscriber line card.