18
xDSL Technology
Upstream ( Mbps ) ADSL ADSL2 1 1 Downstream (Mbps ) 8 12 Transmit ( feet ) 18,000 18,600 Bandwidth ( Hz ) 25K ~ 1.1M 2.5K ~ 2.2M Technology DMT DMT
3-Electrode Arresters
EPCOS Limited/04 13
2-Electrode Arresters
EPCOS Limited/04 14
Typical Telecom Applications
Subscriber终端客户
Overhead Lines高架线 Distributor配线架 Amplifier
EPCOS Limited/04 9
Impulse Discharge Current Wave 8/20 µs冲击放电电流波
EPCOS Limited/04 10
Classifications / Applications / Types
Classifications分类 Light Duty
Surge Arrester Business Unit
EPCOS Limited/04 1
Telecom Protection
Danger: High Voltage Transients 危险来自瞬时高压 Objectives & Requirements for Protection Concepts 保护概念的目标和必要条件 • Reduce the probability of damage to telecommunication infrastructure and service personnel（减少对于通讯构造和服 务人员可能的危险）
Medium Duty Impulse Discharge Current冲击放电电流: 10 kA - 20 kA AC Discharge Current交流放电电流: 10 A Heavy Duty
Impulse Discharge Current:
AC Discharge Current:
20 kA
ADSL2+
SHDSL
1
2.3
24
2.3
18,600
22,000
138K ~ 2.2M
10k ~ 500K
DMT
TC-PAM
VDSL
6
52
5,000
138K ~ 8M
DMT / QAM
VDSL2
100
100
6,000
31M
DMT
EPCOS Limited/04 19
Standards
EPCOS Limited/04 20
20 A
EPCOS Limited/04 11
Technical Characteristics
• DC spark-over voltage:
70 - 5000 V
• Impulse discharge current (8/20 µs):
• Alternating discharge current (1 s): • Arc voltage:
• High reliability over long periods of time（长 时间高可靠性） • Cost-effective（有成本效益）
EPCOS Limited/04 2
Overvoltage Sources
• Lightnings（闪电） (Atmospheric discharges大气放电)
• Induction from power lines（电源线的感应） (Electro-magnetic influence电磁感应)
• Power cross（串火）
EPCOS Limited/04 3
Protection with 2-/3-Electrode Arresters
Protection Principle保护原理:
V13-A500XN application应用: 3+1 Over Voltage Protection过压保护
L FI
N PE
TT - mains • N and PE separately中线和地是分离的 • mainly rural areas主要在乡下地区 • Basestation, Building entrance protection 基站，建筑物入口保护
Supervision of these parameters follows the appropriate standards.
1010 W
0.7 – 1.5 pF -40 ° C - 100 ° C
-40 ° C - 100 ° C
10 % - 95 %
EPCOS Limited/04 12
Arrester Application放电管应用
(Base Stations, Mobile Exchanges, Multiplexer Units) 基站，手机交换，多路器单元
Fibre Optic光纤 Copper铜
EPCOS Limited/04 15
ADSL Network Structure
Two 2-Electrode Arresters
One 3-Electrode Arrester
两个2极放电管
a a
一个3极放电管
Arrester
Arrester e b b Device e
EPCOS Limited/04 4
Device
Signal Line Protection in Modems/Line Cards 在调制解调器/线卡里的信号线路的保护
POTS 光学地面模拟器
EPCOS Limited/04 16
ADSL MODEM Architecture ADSL调制解调器体系结构
Analog Part模拟部分
Phone Line电话 线
Line interface 线路接口
Digital Part数字部分
PC个人电脑
EPCOS Limited/04 17
Line Interface Circuit线路接口线路
SMD inductor : Green color CPPS / HC1 : Pink color Film cap : Red color
Over current protection
A F E
Analog Front End 模拟前端
Transformer
Branch Exchange分支交换机
放大器
MDF 总配线架
Private Automatic Branch Exchange ( PABX )程控交换机
Phone, Fax, Modem, LAN, NetworkTerminals
Cellular Phone Network蜂窝电话网络
Amplifier放大器
Customer Premises
Central Office
ADSL High speed data高速数据 Line NT
PC
ADSL Modem Splitter
Twisted Pair 双绞线 Splitter
ISDN NTBA 总和业务服务网
Exchange
Voice Network声音网络
V Spark-over Voltage
900
1 kV/µs
100 V/µs
800
Dynamic Response动态响应
Impulse Spark-over Voltage冲击 击穿电压
600
(Lightning Influence闪电影响)
Static Response静态响应
400
(rating Voltage工作电压)
Spark-over Characteristic 冲击特性
100 V/s
10 kV/µs 1 kV/µs 100 V/µs
Max. Min.
0
10 2
10 4
10 6
10 8
10 10 V/s
Static Response静态反应 (Uag/Vsdc)
Dynamic Response动态反应 (Uas/Vsi)
2-Electrode Arrester
1 – Electrode电极 2 - Brazing Ring焊接铜环 3 – Insulator绝缘体
1
2
3
2
1
3-Electrode Arrester
1
2
3
2
1
2
3
2
1
EPCOS Limited/04 7
Response Behaviour at Different Voltage Rise Times在不同电压 上升时间的响应特性
Impulse Discharge Current（冲击放电电流）: 2.5 kA - 5kA AC Discharge Current（交流放电电流）: 2.5 A - 5 A
Applications应用 / Types类型
Buried Cables, PBXs in densely populated areas, main distributors, subscriber units（地下电缆，在浓密人口聚 集区的交换机，主配线架和终端保护等） 2e: M5 / EC / L7 3e: T9 Drop boxes overhead cables - buried cables, subscriber units架空电缆的转接接 头，地下电缆，终端客户 2e: N8 / A7 3e: T8 / T2 Overhead lines, installations subject to increased lightning effects, substations in exposed locations架空电缆，易受到闪电袭 击的装置以及处于暴露位置的客户 2e: A8 3e: T6