¥ 价格面议
¥ 价格面议
¥ 8547.00
¥ 8547.00
¥ 8852.00
易卖工控网(www.ymgk.com)提供”C98043-A7002-L4-12 万千商品”,产品详情:品牌/厂家:PLC-DCS系列、型号:C98043-A7002-L4-12、成色:全新、货期:现货 1天内发货、保修:180天,更多产品详情就上易卖工控网。
由于计算机集成芯片技术的发展,存储器的价格已下降,因此,为保证应用项目的正常投运,一般要求PLC的存储器容量,按256个I/O点至少选8K存储器选择。需要复杂控制功能时,应选择容量更大,档次更高的存储器。
(五)冗余功能的选择
1.控制单元的冗余
(1)重要的过程单元:(包括存储器)及电源均应1B1冗余。
(2)在需要时也可选用PLC硬件与热备软件构成的热备冗余系统、2重化或3重化冗余容错系统等。
2.I/O接口单元的冗余
(1)控制回路的多点I/O卡应冗余配置。
(2)重要检测点的多点I/O卡可冗余配置。3)根据需要对重要的I/O信号,可选用2重化或3重化的I/O接口单元。
(六)经济的考虑
选择PLC时,应考虑能价格比。考虑经济时,应同时考虑应用的可扩展、可操作、投入产出比等因素,进行比较和兼顾,终选出较满意的产品。
输入输出点数对价格有直接影响。每增加一块输入输出卡件就需增加一定的费用。当点数增加到某一数值后,相应的存储器容量、机架、母板等也要相应增加,因此,点数的增加对选用、存储器容量、控制功能范围等选择都有影响。在估算和选用时应充分考虑,使整个控制系统有较合理的能价格比。
分析了电磁干扰及其对PLC控制系统干扰的机制,指出在工程应用时必须综合考虑控制系统的抗干扰能,并结合工程提出了几种有效的抗干扰措施。
1概述
随着科学技术的发展,PLC在工业控制中的应用越来越广泛。PLC控制系统的可靠直接影响到工业企业的安全生产和经济运行,系统的抗干扰能力是关系到整个系统可靠运行的关键。自动化系统中所使用的各种类型PLC,有的是集中安装在控制室,有的是安装在生产现场和各电机设备上,它们大多处在强电电路和强电设备所形成的恶劣电磁环境中。要提高PLC控制系统可靠,一方面要求PLC生产厂家用提高设备的抗干扰能力;另一方面,要求工程设计、安装施工和使用维护中引起高度重视,多方配合才能完善解决问题,有效地增强系统的抗干扰能。
2电磁干扰源及对系统的干扰
2.1干扰源及干扰一般分类
影响PLC控制系统的干扰源与一般影响工业控制设备的干扰源一样,大都产生在电流或电压剧烈变化的部位,这些电荷剧烈移动的部位就是噪声源,即干扰源。
干扰类型通常按干扰产生的原因、噪声干扰模式和噪声的波形质的不同划分。其中:按噪声产生的原因不同,分为放电噪声、浪涌噪声、高频振荡噪声等;按噪声的波形、质不同,分为持续噪声、偶发噪声等;按噪声干扰模式不同,分为共模干扰和差模干扰。共模干扰和差模干扰是一种比较常用的分类方法。共模干扰是信号对地的电位差,主要由电网串入、地电位差及空间电磁辐射在信号线上感应的共态(同方向)电压迭加所形成。共模电压有时较大,特别是采用隔离能差的配电器供电室,变送器输出信号的共模电压普遍较高,有的可高达130V以上。共模电压通过不对称电路可转换成差模电压,直接影响测控信号,造成元器件损坏(这就是一些系统I/O模件损坏率较高的主要原因),这种共模干扰可为直流、亦可为交流。差模干扰是指作用于信号两极间的干扰电压,主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压,这种让直接叠加在信号上,直接影响测量与控制精度。
2.2 PLC控制系统中电磁干扰的主要来源
2.2.1来自空间的辐射干干扰
空间的辐射电磁场(EMI)主要是由电力网络、电气设备的暂态过程、雷电、无线电广播、电视、雷达、高频感应加热设备等产生的,通常称为辐射干扰,其分布极为复杂。若PLC系统置于所射频场内,就回收到辐射干扰,其影响主要通过两条路径:一是直接对PLC内部的辐射,由电路感应产生干扰;而是对PLC通信内网络的辐射,由通信线路的感应引入干扰。辐射干扰与现场设备布置及设备所产生的电磁场大小,特别是频率有关,一般通过设置屏蔽电缆和PLC局部屏蔽及高压泄放元件进行保护。
2.2.2来自系统外引线的干扰
主要通过电源和信号线引入,通常称为传导干扰。这种干扰在我国工业现场较严重。
(1)来自电源的干扰
实践证明,因电源引入的干扰造成PLC控制系统故障的情况很多,笔者在某工程调试中遇到过,后更换隔离能更高的PLC电源,问题才得到解决。
PLC系统的正常供电电源均由电网供电。由于电网覆盖范围广,它将受到所有空间电磁干扰而在线路上感应电压和电路。尤其是电网内部的变化,入开关操作浪涌、大型电力设备起停、交直流传动装置引起的谐波、电网短路暂态冲击等,都通过输电线路传到电源原边。PLC电源通常采用隔离电源,但其机构及制造工艺因素使其隔离并不理想。实际上,由于分布参数特别是分布电容的存在,隔离是不可能的。
(2)来自信号线引入的干扰
与PLC控制系统连接的各类信号传输线,除了传输有效的各类信息之外,总会有外部干扰信号侵入。此干扰主要有两种途径:一是通过变送器供电电源或共用信号仪表的供电电源串入的电网干扰,这往往被忽视;二是信号线受空间电磁辐射感应的干扰,即信号线上的外部感应干扰,这是很严重的。由信号引入干扰会引起I/O信号工作异常和测量精度大大降低,严重时将引起元器件损伤。对于隔离能差的系统,还将导致信号间互相干扰,引起共地系统总线回流,造成逻辑数据变化、误动和死机。PLC控制系统因信号引入干扰造成I/O模件损坏数相当严重,由此引起系统故障的情况也很多。
(3)来自接地系统混乱时的干扰
接地是提高电子设备电磁兼容(EMC)的有效手段之一。正确的接地,既能抑制电磁干扰的影响,又能抑制设备向外发出干扰;而错误的接地,反而会引入严重的干扰信号,使PLC系统将无法正常工作。
PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均,不同接地点间存在地电位差,引起地环路电流,影响系统正常工作。例如电缆屏蔽层必须一点接地,如果电缆屏蔽层两端A、B都接地,就存在地电位差,有电流流过屏蔽层,当发生异常状态如雷击时,地线电流将更大。
屏蔽层、接地线和大地有可能构成闭合环路,在变化磁场的作用下,屏蔽层内有会出现感应电流,通过屏蔽层与芯线之间的耦合,干扰信号回路。若系统地与其它接地处理混乱,所产生的地环流就可能在地线上产生不等电位分布,影响PLC内逻辑电路和模拟电路的正常工作。PLC工作的逻辑电压干扰容限较低,逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存贮,造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降,引起对信号测控的严重失真和误动作。
2.2.3来自PLC系统内部的干扰
主要由系统内部元器件及电路间的相互电磁辐射产生,如逻辑电路相互辐射及其对模拟电路的影响,模拟地与逻辑地的相互影响及元器件间的相互不匹配使用等。这都属于PLC制造厂对系统内部进行电磁兼容设计的内容,比较复杂,作为应用部门是无法改变,可不必过多考虑,但要选择具有较多应用实绩或经过考验的系统。
JUNIPER SECURE SERVICES GATEWAY SSG-550M-SH-DC-N VPN!!!
One-day shipping available
JUNIPER NETWORKS PE-1CHSTM1-SMIR PIC REFURBISHED
TESTED 90 DAY WARRANTY
JUNIPER NETWORKS PB-1OC48-SON-SFP 1 PORT PIC NOB
1 PORT OC48 SON SFP NEW OPEN BOX 90 DAY WARRANTY
Juniper PE-1GE-SFP-QPP SFP-1GE-SX PIC M7i M10i Router
Juniper M10BASE-AC w/ RE-333-768, PE-1GE-SX-B, AC PWR
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper TK6000 Ultra-Rugged Data Collector, BT & WiFi
Nice Juniper Netscreen NS-208-001 DC Adv Firewall VPN
Juniper PIC PE 1GE SFP for M7i,M10i non-qpp, 1 year WTY
Mint PE 1GE SFP w/ New Juniper SFP-SX miniGBIC included
Juniper Networks P-AS2-01 Adaptive Services II PIC
NEW JUNIPER SSG-320M-SH Juniper 320M Secure Service Gat
NEW JUNIPER J2320-JH Juniper J2320 Services Router - 3
Juniper PB-4GE-SFP - RF
NEW JUNIPER EX4500-UM-4XSFP Juniper EX4500-UM-4XSFP Exp
NEW JUNIPER SRX-XFP-10GE-LR Juniper 10GBASE-LR XFP Tran
New Juniper PB-1CHOC12SMIR-QPP T320 M320 T640 OC-12 PIC
Juniper Networks M20BASE-DC 1Year Warranty 2X Available
Juniper Networks M40E-FPC1-EP-A Module HECI: IPUCADNCAA
New Juniper SSG-320M-SH
Juniper PB-1GE-SFP-QPP Ethernet 1000BASE-X SFP Module
Juniper P-ML-32 PIC for M20/M40 Warranty
Juniper PB-MS-100-1 PB MS 100
Expedited shipping available
Juniper PB-MS-100-1 PB MS 100
Expedited shipping available
Juniper PB-1CHOC3-SMIR-QPP PB 1CH03 SMIR QPP
Expedited shipping available
Juniper M40e-FPC1 Warranty
Juniper M20 M20BASE-AC Backbone Router
Juniper M20 M20BASE-DC Backbone Router
NEW JUNIPER SRX240H-POE
JUNIPER : NETSCREEN-SA-5000 NS-SA-LAB-5000
JUNIPER : NETSCREEN-SA-5000 NS-SA-LAB-5000-CP
JUNIPER : NETSCREEN-SA-5000 NS-SA-5000
JUNIPER : NETSCREEN-SA-5000 NA-SA-5050A-CP
JUNIPER : NETSCREEN-SA-5000 NA-SA-5000A-C4-5000
Juniper OC3/OC12ATM 4-OC3 & 1-OC12 ATM LINE CARD OC3OC1
Nice Juniper Netscreen NS-208-001 Adv Firewall VPN 2000
HA pair Juniper Netscreen NS-204 Adv Firewall VPN 25/50
Firmware 5.4 r19,remote client,unlimited users, 1YR wty
JUNIPER NETWORKS PC-1OC192-SON-SR2
OC192 PIC M160/T320/T640
JUNIPER NETWORKS PC-1OC192-SON-SR2
Juniper PB-1CHOC3-SMIR-QPP module **1 Year Warranty**
1Port Channelized OC3 PIC , Novia Networks 763-208-6495
Juniper - P-GGSN2 P-GGSN-2
Juniper IB-OC192-SON-SR2-E - Enhanced 1 Port OC192 M160
List Price $235,000.00 - 90 Day Warranty - Free Ship!
Juniper M5 Router AC PE-1GE-SX M5BASE-AC-E RE333-768
90 Day Warranty - Free US Shipping!
Juniper ERX-OCXA256M-MOD ERX1440 OC3/OC12/DS3 Line Card
90 Day Warranty - Free Overnight Shipping
Juniper ERX1440 COC12FO-SM-I/O Channelized OC12/STM4 IO
90 Day Warranty - Free Shipping!
Juniper M160-FPC1-E Enhanced PIC Concentrator M160
90 Day Warranty - Free Overnight Shipping!
Juniper ERX-COC12SM-A-IOA Channelized OC12 for ERX 1440
90 Day Hardware Warranty - Free Shipping!
Juniper PE-2CHDS3 2-port Channelized DS3 PIC M7i M10i
90 Day Warranty - Free Shipping!
Juniper PWR-T320-DC-S T320 Power Entry Module DC Power
90 Day Warranty - Free Overnight Shipping!
Juniper T320-FPC2 2-Port PIC Concentrator T320 Router
90 Day Warranty - Free Shipping!
Juniper PB-4CHDS3-QPP DS3 M120 M320 T320 T640 T1600 PIC
90 Day Warranty - Free Shipping!
NEW Juniper PE-2E3-ATM2 2-Port E3 ATM2 IQ PIC M7i M10i
90 Day Warranty - Free Shipping!
Juniper Netcreen 5000 VPN firewall NS-SA-F5000 NEW
New Juniper DX-3280 Application Acceleration Platform
90 Day Warranty - Free Shipping! DX-3280-SLB-SSL-S-2C
Juniper J-6350-JB Router Junos 9.3R3.8 J6350 High Mem.
90 Day Hardware Warranty - Free Shipping!
Juniper M320-FPC2 Type 2 FPC for Juniper M320 Router
90 Day Warranty - Free Shipping!!
Juniper DX-3200-SLB-SSL-N-2C-A DX3200 Load Balancer
90 Day Warranty - Free Shipping!
Juniper T640-FPC2 Type2 Flexible PIC Concentrator T640
90 Day Warranty - Free Worldwide Shipping!
Juniper PE-12FE-TX for M10/M10i/M5/M7i Warranty
Juniper T640-FPC2 Flexible PIC Concentrator T640 Type 2
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper PE-ASII PE-AS2 PIC Adaptive Services M7i M10i
90 Day Warranty - Free Overnight Shipping!
Juniper Mesa Waterproof Rugged 5.7" Tablet PC, WiFi BT
Juniper M5 w/ RE333-768 M5BASE-E FREESHIP NR
Juniper Networks (SRX-GP-24GE) Expansion module - Et...
Buy this product now!
One-day shipping available
Juniper M10BASE-AC-E Router 1YEARWRN 5XAVL
Juniper Allegro MX Ultra-Rugged Data Collector, WiFi BT
Juniper Allegro MX Ultra-Rugged Data Collector, BT
Juniper PB-4GE-SFP B Version 4 Port SFP GE M40E/M160
Expedited shipping available
JUNIPER EX2200-48P-4G 10/100/1000BaseT 48-ports PoE
JUNIPER P-2OC3-ATM2-SMIR M20/M40 OC3/STM1 MOD IPO2BGE
One-day shipping available
JUNIPER P-2OC3-ATM2-SMIR-B M20/M40 O-C3/STM-1 IPU3AA1
One-day shipping available
JUNIPER SRX240H Security Router 4X PIM
Juniper PB-MS-100-1 Module M40E M160 M320 T320 T640 GF
Agilestar - XENPAK-1XGE-ER - Juniper - New in Box
Juniper M320-PFC2 Flexible PIC Concentrator Type 2 FPC
NEW Juniper SA4500 Base System SSL VPN Appliance
90 Day Warranty - Free Shipping!
Juniper Networks PE-AS2-B Adaptive Services PIC II
NEW Juniper SSG-350M-SH v 6.1.0r2.0 Secure Serv Gateway
90 Day Warranty - Free Shipping!
Juniper PB-AS2 for M40e/M160/M320/T320/T640 Warranty
Juniper WX-100C WAN Acceleration Appliance Copper Int
90 Day Hardware Warranty - Free Shipping!
NEW JUNIPER SRX240H Juniper SRX240 Services Gateway - 4
PE-1CHSTM1-SMIR-QPP PIC 1 OC3 IQ SM IR Juniper M10i M7i
Juniper Networks Secure Services Gateway SS SSG-320M-SH
Brand New & Ready To Ship From A US Authorized Reseller
*NEW SEALED* Juniper EX3200-48T EX3200-48T Ethernet
Juniper M40BASE-AC Chassis w/ PWR-M40-AC + SCB-E-M40
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper M5BASE-AC Chassis w/ RE-333-768 + AC
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper TK6000 Ultra-Rugged Data Collector, 624 MHz
JUNIPER T320-FPC3-E T320 ENHANCED FLEXIBLE PIC CONCENTR
JUNIPER DX-3280 APPLICATION ACCELERATION PLATFORM NIB
Juniper M20 Router 2x AC w/ 1x RE333,1x SSB-E FREESHIP
Juniper M320-FPC3 Type 3 FPC for Juniper M320 Router
90 Day Warranty - Free Shipping!
Juniper M20BASE-AC RE600/2048 P-1GE-SX-B P-4OC3-SON-SM
90 Day warranty - Free Shipping!
Juniper Networks RE-1600-2048 Routing Engine RE-1600
Juniper PC-10GE-SFP Router PIC Network Module
Juniper T320-FPC3-E Enhanced Flexible PIC Concentrator
SHIPS TODAY! *Fully Tested* 1 YR WRNTY! 2+ Avail
One-day shipping available
JUNIPER ERX 1400 UNISPHERE GE/FE-8 GE FE
SIB-I-T640-S SIB-I-T640-B Juniper Networks T640 SIB
Juniper RE-1600-2048 RE 4.0 M320 T320 T640 GF
Juniper PB-1GE-SFP Gigabit Ethernet PIC M320 T320
Juniper T320-FPC2-E T320 Enhanced Flexible PIC Conc
SHIPS TODAY! *$200M in Inventory* 1 YR WRNTY! 2 Avail
One-day shipping available
Juniper M5-Base w/4 Ethernet 1000BASE-SX-B-Cards
Juniper PB-4DS3-ATM2 IQ PIC M120 M320 T320 T640 Router
Free Overnight Shipping - 90 Day Hardware Warranty!
Juniper P-ML-128 M20/M40 Warranty
Juniper P-ASII P-AS2 PIC Adaptive Services M20 M40
90 Day Warranty - Free Overnight Shipping!
JUNIPER NETWORKS IB-OC192-SON-LR-E 1PORT GIGABIT PIC
NEW OPEN BOX 90 DAY WARRANTY
Juniper Networks J-4350-JB-SC Router with JX-1DS3-S
Agilestar - XFP-10G-E-OC192-IR1 - Juniper - New in Box
Juniper Networks SRX240 Services Gateway - Secu SRX240H
Brand New & Ready To Ship From A US Authorized Reseller
Juniper P-12FE-TX 12-Port Ethernet PIC
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper Allegro MX Ultra-Rugged Handheld Data Collector
Juniper P-12FE-TX Module
JUNIPER NETWORKS PB-4GE-SFP 4 PORT GIGABIT ENET PIC NOB
NEW OPEN BOX 90 DAY WARRANTY
JUNIPER NETWORKS PB-4DS3-ATM2 4 PORT DS3 NEW OPEN BOX
90 DAY WARRANTY
Juniper Networks (SSG-140-SH) Netscreen SSG 140 Secu...
Buy this product now!
One-day shipping available
Juniper PB-4DS3-ATM2 Phys Int Card 1YearWrnty 2XAvalble
Juniper M320-FPC3 Type 3 FPC for Juniper M320 Router
SHIPS TODAY! Make an Offer! *1 Year Warranty* 2+ Avail
One-day shipping available
Juniper P-2OC3-ATM2-SMIR Module GF
JUNIPER PB-4DS3-ATM2- WARRANTY - NE
NEW JUNIPER SSG-140-SH Juniper SSG 140 Security Gateway
Juniper DX-3200-SLB-SSL-N-2C USED
Juniper Netscreen NS-ISG-1000 NS-ISG-4FE 2GB Advanced
1 year warranty - we buy and sell networking equipment
Enlarge
Juniper P-4CHDS3-QPP
Juniper RE-400-256 for M10i/M7i Warranty
Juniper Networks J4350 Wired Router
Juniper Networks M40 Internet Backbone Router
Juniper PE-1GE-LH PE 1GE LH
Expedited shipping available
Juniper PB-1GE-LX-B
Expedited shipping available
NEW Juniper PB-4OC3-SON-SMIR 4-port SONET SDH OC-3,STM1
One-day shipping available
Juniper I-1OC48-SON-SFP + FPC-E GF
Juniper PB-1CHOC12SMIR-QPP PIC M40e M320 M640 T320 T640
Juniper Networks (J2320-JB-SC) J-series Services Rou...
Buy this product now!
One-day shipping available
Juniper P-1GE-LH PIC for M20/M40 Warranty
Juniper PB-1OC12-ATM2-SMIR M160 T320 M320 T640 Router
One-day shipping available
Juniper M20BASE-AC RE-600-2048 SSB 4 PICS FPC AC PWR GF
JUNIPER NETWORKS M7i WIRED ROUTER
Juniper Archer Field PC & Carlson SurvCE 2.0 Software
Agilestar - XFP-10G-E-OC192-IR2 - Juniper - New in Box
Agilestar - XFP-10G-E-OC192-IR2 - For Juniper Networks
Juniper PE-1GE-LH M7i M10i M5 M10
Juniper NS-SA-3010A NetScreen Secure Access 3000
Juniper SRX-GP-24GE-POE - SRX-GP-24GE with POE
World's Largest Reseller of Used Foundry/Brocade/Cisco
Expedited shipping available
Juniper M20BASE-AC RE333/768 P-1GE-SX P-4OC3-SON-SMIR
90 Day Warranty - Free Shipping!
Juniper M10BASE-DC-E M10 Router AC Power Available
90 Day Hardware Warranty - Free Shipping!
Juniper NS-5200 w/ NS-5000-M & NS-5000-2G24T 5000-24FE
Save big!! 1-YR warranty, CALL 415-483-1189
One-day shipping available
Juniper Router w/ RE-333-256 and 2 AC Power M10-BASE-AC
NEW Juniper PE-1OC12-SON-SMIR PIC for M5 M7i M10 M10i
90 Day Warranty - Free Shipping!
Juniper M10BASE-AC Chassis w/ RE-333-768 + AC Power
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper M10 Base AC w/ RE-333-768 and (1) AC
Juniper M5 Base AC w/ RE-333-768 and (1) AC
Juniper PB-4DS3-ATM2 Module 4 Port DS3 GF
NEW JUNIPER XFP-10GE-SR Juniper 10GBase-SR Interface Mo
NEW JUNIPER SRX240B Juniper SRX240 Service Gateway - 4
JUNIPER EX-XFP-10GE-ER : JUNIPER ORIGINAL W/ WARRANTY
Juniper M10BASE-DC Chassis w/ RE-333-768 + DC Power
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper Archer Field PC & XF101 Sub-Meter GPS Kit
Juniper J4350-JB-SC Router GF
*New Sealed* JUNIPER EX4200-24T 24-port 10/100/1000Base
Juniper PE-1GE-LH Gigabit Eth PIC, LH Optics M7i M10i
JUNIPER NETWORKS P-ML-128 MULTILINK SERVICES REFURB
TESTED 90 DAY WARRANTY
Juniper PIC PE 2DS3,DS3 for M7i,M10i non-qpp 4chds3
Mint, Guaranteed PE 2DS3 card for Juniper M7i / M10i
JUNIPER NETWORKS PE-ML-128 MULTILINK SERVICES REFURB
TESTED 90 DAY WARRANTY
Juniper PB-4OC3-SON-SMIR 4-port SONET,SDH OC-3,STM1 PIC
90 Day Warranty - Free Shipping!
Juniper PB-4OC12-SON-SMIR 4 OC12 T640/M160/M40e Router
90 Day Hardware Warranty - Free Overnight Shipping!
Juniper Netscreen NS-500ES-GB2-AC Advanced Firewall
100VSYS! - 90 Day Warranty - Free Shipping!
Juniper SSB-E-16-M20 System Switch Board M20 16m DRAM
90 Day Warranty - Free Overnight Shipping!
Juniper SSG-520M-SH Secure Services Gateway High Mem
90 Day Warranty - Free Shipping!
Juniper Networks (SRX220H) SRX220 Services Gateway -...
Buy this product now!
One-day shipping available
Juniper IC6000 Firewall Infranet System
Juniper PE-1GE-SFP 1-Port Gigabit Ethernet PIC
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper PE-1GE-LH 1-Port Gigabit Ethernet Long Haul PIC
1 Year Warranty - No Reasonable Offers Ever Refused!
NEW JUNIPER EX4500-VC1-128G EX4500 128G VIRTUAL CHASSIS
NEW JUNIPER SRX3K-PWR-AC Juniper AC Power Entry Module
NEW JUNIPER JXU-6GE-SFP-S Juniper 6-port SFP Physical I
NEW JUNIPER SRX-XFP-10GE-SR Juniper 10GBase-SR XFP Modu
*NEW* Juniper SSG-140-SH Secure Services Gateway
Juniper SSG 520 VPN Firewall
Juniper M5BASE-AC Warranty M10
M40e-FPC2 Juniper FPC2 M40e
PB-1OC48-SON-SFP Juniper T320, T640 STM16 OC48
JUNIPER PE-1GE-SFP-QPP for M7i and M10i
Juniper NS-ISG-2000-P03A-S00 ISG 2000 w/ISG-2000-GB2-TX
One-day shipping available