Bourns ® Circuit Protection Selection Guide Circuit Protection Solutions

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Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Why Protection is Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Bourns® Circuit Protection Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Select the Appropriate Device for your Application . ....

Introduction Bourns is pleased to present this comprehensive guide to Telecom Circuit Protection, encompassing our broad range of technologies and products. This guide will provide the background information and selection recommendations needed to ensure that your next project achieves the level of cost-effective field reliability demanded by today’s customers. Bourns commissioned a survey of telecom circuit protection users worldwide to determine their priorities and needs. We found that reliability, technical and design support and exemplary knowledge of protection technology were by far the...

Communication systems are vulnerable to damage from lightning or other electrical surges. As systems become more complex, they also become more vulnerable. Balancing the cost, standards compliance and field reliability of protection of such systems is both a commercial and technical challenge, compounded by the additional performance constraints of modern digital networks such as xDSL. A "surge" is a temporary increase in voltage, current or both. Lightning and the AC power distribution system cause surges, but of very different magnitudes and durations (see Table 1). These events can either...

Intra-Building Wiring Splitter NID NID MDF MDF TwistedPair POTS NID NID Fiber Customer Premise (Subscriber) Circuit Protection Powered IT Safety US Region Powered IT Safety 4 Outside Plant Customer Premise Customer Premise (Subscriber) Central Ofce Access UL 60950-1 (2003) UL 60950-21 (2003) GR-974-CORE 2002) GR-1361-CORE (1998) TIA-968-A + A1 + A2 (2002-2003-2004 – Part 68) GR-1089-CORE (2002) IEC 60950-1 (2001) GR-1089-CORE (2002) IEC 60950-21 (2002) ITU-T K.50 (2000) GR-1089-CORE (2002) ITU-T K.51 (2000) ITU-T K.12 (2000) Primary Protection Equipment Secondary Protection Figure 2 Central Office...

Bourns® Circuit Protection Products Overvoltage Products Bourns family of Gas Discharge Tubes (GDTs) creates a quasi short circuit across the line when the gas is ionized quasi by an overvoltage, returning to their high impedance state after the surge has terminated. These robust devices have the highest impulse current capability of any technology combined with negligible capacitance, making them very attractive for the protection of high speed digital lines as well as standard POTS lines. MSP® and TRIGARD® Gas Discharge Tubes Bourns family of TISP® Thyristor-based devices initially clamp the...

Bourns family of Line Protection Modules (LPMs) is based on the most fundamental form of current protection , the Line Feed Resistor (LFR), normally fabricated as a thick-film resistor on a ceramic substrate. LPMs have the ability to withstand high voltage impulses without breaking down, AC current interruption occurs when the high temperature developed by the resistor causes mechanical expansion stresses that result in the ceramic breaking open. Low current power induction may not break the LFR open, creating long-term surface temperatures of more than 300 °C. To avoid heat damage to the PCB...

connect the device to other external devices such as laptop computers and headsets. Bourns offers the capability to integrate resistors, capacitors, inductors, diodes and transistors into a single monolithic device with minimal packaging overhead. Outside Plant Bourns Outside Plant product line offers a full line of protection products based on our own Gas Discharge Tube (GDT) and patented Multi-Stage Protection (MSP®) technology. Products include 5-Pin protectors for the central office, building entrances and a wide range of station protectors for the customer premises. We also offer a complete...

Selecting the Appropriate Device for your Application The following Network Diagram gives an overview of where the various technologies are used in today’s communication electronics industry. Circuit Protection Solutions 8

Network Diagram Line Protection Modules Telecom fuses / Mufti fuse* Resettable fuses Thyrtstcr Surge Protectors Multilayer Varistors FOUT nvnt (ttto

Several generic examples of the use of protection components are given over the following pages for your reference. Our field application engineers are available to discuss your actual circuit configuration and requirements. Central Ofce (CO) Multifuse® Resettable Fuse LPM TISP® Thyristor Surge Protection SLIC PROTECTOR SLIC 1 VBAT1 C1 100 nF 0V TISP6NTP2A SLIC 2 4A12P-516-500 or MF-RX012/250 VBAT2 IG C2 100 nF 0V Integrated Line Protection for Multiple SLICs GDT Multifuse® Resettable Fuse LPM TISP® Thyristor Surge Protection RING/TEST PROTECTION TISP® Thyristor Surge Protection TEST RELAY RING...

Central Ofce (CO) – continued GDT Multifuse® Resettable Fuse LPM RING RELAY SLIC RELAY SLIC TIP Th1 SW1 SW3 LCAS Th2 Th3 Th4 2026-xx or 2036-xx 4B06B-540-125/219 or MF-RX012/250 SW4 R2 SW2 CONTROL LOGIC RING Vbat R1 VRING VBAT SW5a SW5b RING GENERATOR Line Card Protection with Solid-State Line Card Access Switch 11