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日期：2021-11-12PLC网络是由几级子网复合而成，各级子网的通信过程是由通信协议决定的，而通信方式是通信协议最核心的内容。通信方式包括存取控制方式和数据传送方式。所谓存取控制（也称访问控制）方式是指如何获得共享通信介质使用权的问题，而数据传送方式是指一个站取得了通信介质使用权后如何传送数据的问题。
1．周期I/O通信方式
周期I/O通信方式常用于PLC的远程I/O链路中。远程I/O链路按主从方式工作，PLC远程I/O主单元为主站，其它远程I/O单元皆为从站。在主站中设立一个“远程I/O缓冲区”，采用信箱结构，划分为几个分箱与每个从站—一对应，每个分箱再分为两格，一格管发送，一格管接收。主站中通信处理器采用周期扫描方式，按顺序与各从站交换数据，把与其对应的分箱中发送分格的数据送给从站，从从站中读取数据放入与其对应的分箱的接收分格中。这样周而复始，使主站中的“远程I/O缓冲区”得到周期性的刷新。
在主站中PLC的CPU单元负责用户程序的扫描，它按照循环扫描方式进行处理，每个周期都有一段时间集中进行I/O处理，这时它对本地I/O单元及远程I/O缓冲区进行读写操作。PLC的CPU单元对用户程序的周期性循环扫描，与PLC通信处理器对各远程I/O单元的周期性扫描是异步进行的。尽管PLC的CPU单元没有直接对远程I/O单元进行操作，但是由于远程I/O缓冲区获得周期性刷新，PLC的CPU单元对远程I/O缓冲区的读写操作，就相当于直接访问了远程I/O单元。这种通信方式简单、方便，但要占用PLC的I/O区，因此只适用于少量数据的通信。
2．全局I/O通信方式
全局I/O通信方式是一种串行共享存储区的通信方式，它主要用于带有链接区的PLC之间的通信。
全局I/O方式的通信原理如图7-27所示。在PLC网络的每台PLC的I/O区中各划出一块来作为链接区，每个链接区都采用邮箱结构。相同编号的发送区与接收区大小相同，占用相同的地址段，一个为发送区，其它皆为接收区。采用广播方式通信。PLC1把1＃发送区的数据在PLC网络上广播，PLC2、PLC3收听到后把它接收下来存入各自的1＃接收区中。PLC2把2＃发送区数据在PLC网上广播，PLC1、PLC3把它接收下来存入各自的2＃接收区中。PLC3把3＃发送区数据在PLC网上广播，PLC1、PLC2把它接收下来存入各自的3＃接收区中。显然通过上述广播通信过程，PLC1、PLC2、PLC3的各链接区中数据是相同的，这个过程称为等值化过程。通过等值化通信使得PLC网络中的每台PLC的链接区中的数据保持一致。它既包含着自己送出去的数据，也包含着其它PLC送来的数据。由于每台PLC的链接区大小一样，占用的地址段相同，每台PLC只要访问自己的链接区，就等于访问了其它PLC的链接区，也就相当于与其它PLC交换了数据。这样链接区就变成了名符其实的共享存储区，共享区成为各PLC交换数据的中介。
图7-27 全局I/O方式的通信原理
链接区可以采用异步方式刷新（等值化），也可以采用同步方式刷新。异步方式刷新与PLC中用户程序无关，由各PLC的通信处理器按顺序进行广播通信，周而复始，使其所有链接区保持等值化；同步方式刷新是由用户程序中对链接区的发送指令启动一次刷新，这种方式只有当链接区的发送区数据变化时才刷新。
全局I/O通信方式中，PLC直接用读写指令对链接区进行读写操作，简单、方便、快速，但应注意在一台PLC中对某地址的写操作在其它PLC中对同一地址只能进行读操作。与周期I/O方式一样，全局I/O方式也要占用PLC的I/O区，因而只适用于少量数据的通信。
3．主从总线通信方式
主从总线通信方式又称为1：N通信方式，是指在总线结构的PLC子网上有N个站，其中只有1个主站，其它皆是从站。
1：N通信方式采用集中式存取控制技术分配总线使用权，通常采用轮询表法。所谓轮询表是一张从机号排列顺序表，该表配置在主站中，主站按照轮询表的排列顺序对从站进行询问，看它是否要使用总线，从而达到分配总线使用权的目的。
对于实时性要求比较高的站，可以在轮殉表中让其从机号多出现几次，赋予该站较高的通信优先权。在有些1：N通信中把轮询表法与中断法结合使用，紧急任务可以打断正常的周期轮询，获得优先权。
1：N通信方式中当从站获得总线使用权后有两种数据传送方式。一种是只允许主从通信，不允许从从通信，从站与从站要交换数据，必须经主站中转；另一种是既允许主从通信也允许从从通信，从站获得总线使用权后先安排主从通信，再安排自己与其它从站之间的通信。
4．令牌总线通信方式
令牌总线通信方式又称为N：N通信方式是指在总线结构的PLC子网上有N个站，它们地位平等没有主站与从站之分，也可以说N个站都是主站。
N：N通信方式采用令牌总线存取控制技术。在物理总线上组成一个逻辑环，让一个令牌在逻辑环中按一定方向依次流动，获得令牌的站就取得了总线使用权。令牌总线存取控制方式限定每个站的令牌持有时间，保证在令牌循环一周时每个站都有机会获得总线使用权，并提供优先级服务，因此令牌总线存取控制方式具有较好的实时性。
取得令牌的站有两种数据传送方式，即无应答数据传送方式和有应答数据传送方式。采用无应答数据传送方式时，取得令牌的站可以立即向目的站发送数据，发送结束，通信过程也就完成了；而采用有应答数据传送方式时，取得令牌的站向目的站发送完数据后并不算通信完成，必须等目的站获得令牌并把应答帧发给发送站后，整个通信过程才结束。后者比前者的响应时间明显增长，实时性下降。
5．浮动主站通信方式
浮动主站通信方式又称N：M通信方式，适用于总线结构的PLC网络，是指在总线上有M个站，其中N（N＜M＝个为主站，其余为从站。
N：M通信方式采用令牌总线与主从总线相结合的存取控制技术。首先把N个主站组成逻辑环，通过令牌在逻辑环中依次流动，在N个主站之间分配总线使用权，这就是浮动主站的含义。获得总线使用权的主站再按照主从方式来确定在自己的令牌持有时间内与哪些站通信。 一般在主站中配置有一张轮询表，可按轮询表上排列的其它主站号及从站号进行轮询。获得令牌的主站对于用户随机提出的通信任务可按优先级安排在轮询之前或之后进行。
获得总线使用权的主站可以采用多种数据传送方式与目的站通信，其中以无应答无连接方式速度最快。
6.CSMA/CD通信方式
CSMA/CD通信方式是一种随机通信方式，适用于总线结构的PLC网络，总线上各站地位平等，没有主从之分，采用CSMA/CD存取控制方式，即“先听后讲，边讲边听”。
CSMA/CD存取控制方式不能保证在一定时间周期内，PLC网络上每个站都可获得总线使用权，因此这是一种不能保证实时性的存取控制方式。但是它采用随机方式，方法简单，而且见缝插针，只要总线空闲就抢着上网，通信资源利用率高，因而在PLC网络中CSMA/CD通信法适用于上层生产管理子网。
CSMA/CD通信方式的数据传送方式可以选用有连接、无连接、有应答、无应答及广播通信中的每一种，可按对通信速度及可靠性的要求进行选择。
以上是PLC网络中常用的通信方式，此外还有少量的PLC网络采用其它通信方式，如令牌环的通信方式等。另外，在新近推出的PLC网络中，常常把多种通信方式集成配置在某一级子网上，这也是今后技术发展的趋势 咨询热线：18150695049
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NEW Sealed Cisco RSP720-3C-10GE 7600 Series RSP720-10GE with PFC-3C Card
NEW SEALED Cisco WS-C4500X-16SFP+ 16Port SFP Switch 10G+ 2x C4KX-PWR-750AC-R
CISCO ASA5540-AIP40-K8 | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems L-ASA-UC-750-1K | incl 19% VAT | 2 years Cybertrading warranty
Cisco Catalyst 4500-X - Switch - 16 x 10 Gigabit SFP+
New Cisco Systems PVDM3-16U256 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems PVDM3-32U256 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems PVDM3-64U256 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems PVDM3-256 incl 19% VAT // 2 years IT4Trade warranty
Cisco Systems AIR-CT5508-50-K9 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems WS-C3750X-48PF-E incl 19% VAT // 2 years IT4Trade warranty
Cisco Catalyst 3560X-48P-S - Switch - verwaltet
~NEW SEALED~ CISCO N5K-C5548P-FA 32 Port Switch ~FAST DELIVERY~
NEW Cisco WS-C3850-48U-L Catalyst 3850 48 Port UPOE LAN Base Ethernet Switch
Cisco WS-X4448-GB-SFP Catalyst 4500 48-Port 1000Base-X
CISCO 15454-OPT-BST-E= ONS 15454 Enhanced Optical Booster 3YR WNTY
*Brand NEW* CISCO WS-C3850-48T-E 48 10/100/1000 Ethernet ports Switch
BRAND NEW IN BOX Cisco RSP720-3C-10GE Route Switch Processor 720-10GE SHIP FAST
New Cisco Systems WS-C3650-48PD-E | incl 19% VAT | 2 years Cybertrading warranty
*New Sealed* Cisco RSP720-3C-10GE Cisco 7600 Series RSP720-10GE with PFC-3C
CISCO CATALYST 3850 12 PORT GE SFP IP BASE
Cisco Systems N10-S6100-UPG
Cisco Systems CVPN3015-NR-BUN
Cisco Systems WS-C4507R-E-S2+96V
Cisco Systems SPA-4XOC3-POS-V2
New CISCO WS-C3560E-12SD-S | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems 12406/120
Cisco Systems 15216-AD4-2A-56.5
Cisco Systems WS-C4510R-E
New Cisco Systems WS-X4516-10GE | incl 19% VAT | 2 years Cybertrading warranty
CISCO ASA5580-20-4GE-K9 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems MCS7828I5-K9-WL8
New CISCO WS-C4500X-16SFP+ | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems C3900-SPE200/K9 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems BPX-BXM-T3-12EX
Cisco Systems 15454-DS3XM-6-T
Cisco Systems AXSM-2-622-E
Cisco Systems 15216-AD4-2A-60.6
Cisco Systems BPX-BXM-E3-12E
New Cisco Systems AS54-DFC-CT3 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems 15454-PP-MESH-8
Cisco Systems GSR06/120
CISCO VS-C6509VE-S72010G | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems SPA-4XOC3-POS
Cisco Systems ASA5510-AIP20SP-K8
Cisco Systems ME2600X-44FE-D-K9
Cisco Systems MCS-7845-I1-ECS1
Cisco Systems MCS-7845-I1-ECS2
Cisco Systems MCS-7845-I1-IPC1
Cisco Systems MCS-7845-I2-CCE1
Cisco Systems MCS-7845-I2-CCE3
Cisco Systems MCS-7845-I2-CTS1
Cisco Systems MCS-7845-I2-ECS2
Cisco Systems MCS-7845-I2-ECS3
Cisco Systems MCS-7845-I2-ECS4
Cisco Systems MCS-7845-I2-IPC1
Cisco Systems MCS7845I2-K9-CMC1
Cisco Systems MCS-7845-I2-RC2
Cisco Systems MCS-7845-I2-ECS1
New CISCO ASA5520-AIP20-K9 | incl 19% VAT | 2 years Cybertrading warranty
CTI-8050-SUP-K9 Cisco TelePresence Supervisor MSE 8050
Cisco N5K-C5672UP Switch Refurbished AS NEW N5K-C5672UP-RF
NEW IN BOX Cisco WS-C3650-48PQ-E CISCO 48 POE+ GE, 4x10G, 640W, IP SERVICE
Cisco WAVE-694-K9
CISCO WS-X4724-SFP-E= Catalyst 4500E Series 24-Port GE
CISCO WS-X6708-10G-3C 8-Port 10 Gigabit Ethernet Module
Cisco ASR1001-4X1GE ASR1001 System, 4 Built-In GE, 4X1GE IDC,
Cisco WAVE-694-K9 694 Application Accelerator 1YearWarranty 2+Available
New Cisco WS-X6816-10G-2T Expansion Module with 1 Year Warranty
15454-40E-MXP-C CISCO ONS 40GBPS ENH FEC FULL BAND TUNEABLE MUXPONDER WOWUA2ADAC
Cisco WS-C6504-E Dual P/S 1x VS-S720-10G-3C 2x WS-X6708-10G-3CXL
**NEW** SPA-1XCHSTM1/OC3 1-port Channelized STM-1/OC-3c to DS0 Shared Port
Cisco Systems ASA-VPN-FL-750
New CISCO L-ASA-VPN-FL-750 | incl 19% VAT | 2 years Cybertrading warranty
*New Sealed*Cisco N3K-C3548P-10G Nexus 3548, 48 SFP+ ports,FastShip,Ask for More
NEW Cisco WS-C3850-48T-E 48 10/100/1000 Ethernet ports Switch with 350WAC power
New Cisco Systems N10-S6100-UPG | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems BPX-BXM-E3-12E | incl 19% VAT | 2 years Cybertrading warranty
CISCO BPX-BXM-T3-12EX | incl 19% VAT | 2 years Cybertrading warranty
CISCO 15454-DS3XM-6-T | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems AXSM-2-622-E | incl 19% VAT | 2 years Cybertrading warranty
CISCO 15216-AD4-2A-60.6 | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems AS54-DFC-CT3 | incl 19% VAT | 2 years Cybertrading warranty
CISCO ME2600X-44FE-D-K9 | incl 19% VAT | 2 years Cybertrading warranty
CISCO WS-6509EXL-2FWM-K9 | incl 19% VAT | 2 years Cybertrading warranty
CISCO VS-C6509VE-S72010G | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems 7606-AC-BUN | incl 19% VAT | 2 years Cybertrading warranty
New CISCO MCS7845I1-K9-CMA2 | incl 19% VAT | 2 years Cybertrading warranty [MCS7
Cisco UCSC-C240-M3S dual P/S 10x 300GB 6Gb SAS, 2x Xeon E5-2609, 56GB (4GB) DDR3
Cisco Systems WS-C3850-48U-E incl 19% VAT // 2 years IT4Trade warranty
CISCO AS535XM-2E1-60-V | incl 19% VAT | 2 years Cybertrading warranty
*New In Box* Cisco WS-C3650-48PQ-E 48 POE+ GE, 4x10G, 640W * Fast Shipment *
Cisco Systems 76-ES+T-20G
CISCO ASA5580-40-10GE-K9 ASA 558040 Appliance with 4 10GE, 3 YR WARRANTY
*New Sealed* Cisco WS-C3650-48PQ-E 48 10/100/1000 Ethernet PoE+ Switch
CISCO ISR 4451-X VOICE & VIDEO BUNDLE ISR4451-X-V/K9 PVDM4-64 25 SESSIONS NEW
NEW SEALED Cisco D9859-ATP-1RU 1YearWarranty 2+Available
CISCO3945E/K9 Cisco 3945 Router with 4 onboard GE IP Base w/ HWIC-1DSU-T1 Module
NEW IN BOX CISCO CISCO3945E/K9 INTEGRATED SERVICE ROUTER 3945E **SHIP FAST**
Cisco Systems 15216-AD1-2A-56.5
#NEW# Cisco CISCO3945E/K9 3945E Integrated Services Router #FAST SHIPMENT#
NEW Cisco WS-C3650-48PQ-E 48 10/100/1000 Ethernet PoE+ and 4x10G Uplink ports
CISCO (WS-C3750X-24P-S) CATALYST 3750X 24 PORT POE IP BASE WS-C3750X-24P-S
Cisco ASR1001-4X1GE ASR1001 Router 4 Built-In GE, 4X1GE IDC,
10 Pieces New WS-C4948-E Cisco Catalyst 4948 Switch w/ Dual DC Power Supply
**NEW** WS-X4724-SFP-E Catalyst 4500E Series 24-Port GE (SFP)
Cisco Systems SPA-1XOC12-ATM-V2
Cisco Systems 12006-AC | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems 12006-DC | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems 12000/6-DC | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems C3925E-VSEC/K9 incl 19% VAT // 2 years IT4Trade warranty
CISCO ASA5540-AIP40-K9 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems A9K-MPA-2X10GE
New Cisco Systems WS-X45-SUP8-E | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems WS-X45-SUP8-E/2 | incl 19% VAT | 2 years Cybertrading warranty
NEW SEALED Cisco WS-X6716-10G-3CXL Exp module 10G 1YearWarranty 2+Available
NEW Sealed Cisco AIR-CT5508-100-K9 5500 Series Wireless Controller Access Points
Cisco WS-C3850-24S-E 24-Port SFP Gigabit 3850 Switch w/ AC PWR - 1 Year Warranty
CISCO AS535XM-8E1-V-HC - AS5350XM Voice; 8E1, 10 AS5X-PVDM2-64, 512D/128F 3YR Wa
NEW SEALED CISCO WS-X4712-SFP+E - Catalyst 4500 E-Series 12-Port 10GbE - 3YR War
WCS-PLUS-100 Cisco Wireless Control System PLUS
CISCO A9K-40GE-E - 40-Port GE Extended Line Card, Requires SFPs - 3 Yr Warranty
CISCO ASR1002 w/ 2AC ASR1000-ESP5, SPA-5X1GE-V2 similar ASR1002-5G/K9 - 3YR
CISCO 76-ES+XC-20G3CXL - 7600 ES+XC 10x1GE/ 1x10GE DFC3CXL - 3YR Warranty
Cisco UCSC-C240-M3S dual P/S 8x 500GB 6Gb SATA, 2x Xeon E5-2630Lv2, 96GB (8GB)
~NEW SEALED~ CISCO AIR-CT5508-25-K9 Wireless Controller ~FAST DELIVERY~
Cisco WS-C6509E-S32-10GE Bundle 1YearWarranty 2+Available
NEW SEALED Cisco ASA5520-AIP10-K9 ASA 5520 IPS Edition 1YearWarranty 2+Available
Cisco WS-SVC-NAM-1-250S Network Analysis Module 1YearWarranty 2+Available
NEW SEALED Cisco N7K-M148GT-11L Switch 1YearWarranty 2+Available
NEW Cisco N10-S6100 UCS 6120XP Fabric Interconnect 1YearWarranty 2+Available
Cisco 15454-10ME-L1-C MultirateTransponderCard 1YearWarranty 2+Available
NEW SEALED Cisco SPA-4XOC3-POS Port Adapter 1YearWarranty 2+Available
Cisco ASR-9010-DC Expansion Base 1YearWarranty 2+Available
Cisco Intrusion Protection System 4345 Security Appliciance - PN: IPS-4345-K9
CISCO 15454-DS3XM Transmultiplexer Card 15454-DS3XM-12 DS3, 12 Ckt, I-Temp
CISCO VS-S2T-10G SUPERVISOR Engine
CISCO VS-S2T-10G Cisco Catalyst 6500 Series Supervisor Engine 2T
Cisco ASR1000-2T+20X1GE ASR1000 2-port 10GE 20-port GE Module ASR1006 ASR1013
657787-B21 HP CISCO B22 FABRIC EXTENDER W/16 FET 658591-001
NEW Cisco ASA5525-IPS-K9 ASA 5525X IPS Edition
NEW Cisco SPA-10X1GE-V2 10-Port Gigabit Ethernet Shared Port Adapter
CISCO C3925-CME-SRST/K9 3925 Voice Bundle Router
**New** L-LIC-CT5508-100A= 100 AP Adder Licenses for 5508
New Cisco N9K-C9396PX Nexus Switch N9K-M12PQ N9K-PAC-650W-B N9K-C9300-FAN2-B AK
Cisco UCSB-B200-M3 18x 8GB DDR3, 2x E5-2630 v2, 2x 900GB 6Gb SAS 10K RPM SFF
NEW Cisco N9K-C9396PX Nexus Switch N9K-C9396PX N9K-M12PQ N9K-PAC-650W10GE AK
Cisco ASA5585-S10-K9
Cisco 7600-ES+20G3CXL Line Card w/ 20-Port GE & DFC3CXL TESTED - Ships Today!
Cisco WS-C4506-E WS-X45-SUP6L-E 2x WS-X4448-GB-SFP WE CAN CUSTOMIZE 4U
*New* Cisco WS-C3650-48PS-E 48 10/100/1000 Ethernet PoE+ Switch
Cisco ASA 5585-X Chassis with SSP-10, 8 GE ports, 2 SFP ports, 1 AC power supply
Cisco AS54XM-CT3-648-V Universal Gateway 1Yr Warranty Free Ship! AS5X-VUFC-108NP
Cisco Nexus 6000 48-Port 10GE Switch N6K-C6001-64P
Cisco ASR1001-X ASR1001X-5G-K9 5Gbps 16GB Dram Loaded W/Licenses C1-SLASR1-AES
Cisco VS-S720-10G-3CXL Supervisor 6500/7600
NEW Sealed CISCO N5K-C5548P-FA Chassis w/ 32 fixed ports 2 750W AC Power Supply
New Cisco Systems WS-C3850-48T-E | incl 19% VAT | 2 years Cybertrading warranty
NEW CISCO3945E/K9 Integrated Services Router Cisco 3945 Router
NEW Sealed Cisco N5K-C5548P-FA Chassis includes 32 fixed ports, Front-to-Back
NEW Sealed Cisco N3K-C3548P-10G Nexus 3548 Switch with 48 SFP+, C3548P 10G
!BRAND NEW IN BOX ! CISCO N5K-C5548P-FA Nexus 5548P Chassis ! SHIP FAST !
*New In Box* CISCO N5K-C5548P-FA Nexus 5548P Switch Chassis * Fast Shipment *
CISCO ASA 5525-X with SW, 8GE Data, 1GE Mgmt, AC, 3DES/ AES ASA5525-K9
16OC48-POS/DPT Cisco CRS-1 16-Port OC-48c/STM-16c POS/DPT Interface Module
NEW Sealed VS-S2T-10G Catalyst 6500 Series Supervisor Engine 2T *Fast Shipping*
Cisco UCSB-B200-M3 6x 8GB DDR3, 2x E5-2643 v2, 2x 900GB 6Gb SAS 10K RPM
CISCO AS535XM-2E1-V-HC | incl 19% VAT | 2 years Cybertrading warranty
HP C7000 W/ 16x BL460C G6 BLADE 2x CISCO 3020 2x L5520 96GB 2X 600GB 10K RAILS
HP C7000 W/ 16x BL460C G6 BLADE 2x CISCO 3020 2x E5540 96GB 2X 600GB 10K RAILS
NEW Cisco WS-X6816-10G-2T 6800 Series 16-Port 10 Gigabit Ethernet Fiber Module
CISCO ME-3600X-24FS-M | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems A9K-MPA-2X10GE
NEW Cisco Nexus N9K-C9396PX N9K-C9396PX-FA-L3 Enhanced L3 Lic N93-LAN1K9
*New* Cisco WS-C3850-24S-S 24 SFP Ethernet ports Switch
NEW SEALED CISCO CTS-EX90-K9 EX90 Video conferencing kit 1YearWaranty 2+Avalable
Cisco 12000-SIP-501 Interface Processor 1YearWarranty 2+Available
Cisco B440-BASE-M2 High-Performance Blade Server 1YearWarranty 2+Available
New Sealed Cisco BE6K-ST-BDL-K9 Business Edition 6000 Server 1YearWrnty 2+Avlble
Cisco RSP720-3CXL-10GE 7600 Series RSP720-10GE Module with PFC-3CXL
Cisco ASR1004-10G/K9 4-Slot Chassis w/ AC PWR, ASR1000-ESP10, ASR1000-RP1 Bundle
CISCO WS-C3850-48P-E Switch 48x1GE PoE w/racks 6MthWtyTaxInv
New CISCO SPA-1XOC12-ATM-V2 | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems N2K-C2232TM-10GE incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems WS-C3750X-48P-E incl 19% VAT // 2 years IT4Trade warranty
Cisco Systems WS-X4724-SFP-E incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems ASA5515-IPS-K8 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems A9K-MPA-2X10GE | incl 19% VAT | 2 years Cybertrading warranty
NEW Cisco WS-C4506E-S7L+96V+ 4506-E Chassis, two WS-X4648-RJ45V+E, Sup7L-E, LAN
Cisco Systems CTS-INTP-C40-K9
Cisco Systems ESR1OC48/P/SRPSMS
Cisco Systems 12000/6-DC
New Cisco Systems L-ASA-SC-50 | incl 19% VAT | 2 years Cybertrading warranty
New CISCO L-ASA5545-IPS-SSP | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems ASA5545-IPS-SSP
Cisco Switch Bundle WS-C6504-E + VS-S720-10G-3C WS-X6716-10GE 16x 10GbE X2-Slot
New Cisco Systems WS-C3650-48TD-E | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems WS-C3650-48FS-E
New Cisco Systems WS-X45-SUP7-E/2 | incl 19% VAT | 2 years Cybertrading warranty
New Sealed Cisco UCS-FI-E16UP Expansion Module 1Year Warranty 2+Available
CISCO 15454-OPT-AMP-C Optical Amplifier Module
Cisco RSP720-3CXL-10GE 10 GigE 720Gbps Route Switch Processor 7600-PFC-3CXL MH
Cisco WS-C3850-24PW-S (Refurbished) Cisco Catalyst 3850 24 Port PoE w/ 5 AP
NEW IN BOX CISCO VS-S2T-10G 6500 SERIES SUPERVISOR ENGINE 2T **SHIP FAST**
New Sealed Cisco CISCO VS-S2T-10G Sup Engine 2T with 2 ports 10GbE
Cisco C891-24X/K9 16 Port Gigabit 8 Port PoE Switch
New Sealed CISCO WS-X6816-10G-2T 6800 Series 16-Port 10 Gigabit Ethernet Module
CATALYST 3560X 48 PORT Cisco WS-C3560X-48P-L
Cisco Systems N2K-C2232TF-10GE incl 19% VAT // 2 years IT4Trade warranty
Cisco Systems C3945-CME-SRST/K9 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems N2K-C2224TF incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems ASA5550-K8 incl 19% VAT // 2 years IT4Trade warranty
New Cisco Systems N2K-C2148T-1GE incl 19% VAT // 2 years IT4Trade warranty
Cisco Systems N3K-C3048-BA-L3
Cisco Systems N3K-C3048-FA-L3
Cisco Systems N3K-C3048-FD-L3
Cisco Systems WS-C6506E-S32P10GE
Cisco Systems WS-C6513-XL-FWM-K9
Cisco Systems WS-X4640-CSFP-E
Cisco Systems DWDM-XENPAK-59.79
Juniper CFP-100GBASE-LR4
New Cisco Systems WS-C3850-48P-E | incl 19% VAT | 2 years Cybertrading warranty
CISCO WS-C6506E-S32-10GE | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems WS-SSC-600 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems ESR1OC48/P/SRPSMS
Cisco Systems CTS-INTP-C40-K9-ref [CTS-INTP-C40-K9-ref ]
Cisco Systems L-ASA-SC-50
Cisco Systems 10000-1P2-1AC
Cisco Systems 10000-1P2-1DC
New Cisco Systems ASA5500-SC-50 | incl 19% VAT | 2 years Cybertrading warranty
**NEW SEALED** CISCO AIR-CT5508-50-?K9 Aironet AIRCT5508
*New In Box* Cisco N3K-C3064PQ-10GX 48 ports Managed Switch **Fast Shipment**
#NEW# Cisco N3K-C3548P-10G 3549 Managed Switch #FAST SHIPMENT#
CISCO CATALYST 3850 24 PORT DATA IP SERVICES IN
New Cisco Systems L-ASA-SC-50 | incl 19% VAT | 2 years Cybertrading warranty
New CISCO L-ASA5545-IPS-SSP | incl 19% VAT | 2 years Cybertrading warranty
CISCO ESR1OC48/P/SRPSMS | incl 19% VAT | 2 years Cybertrading warranty
CISCO CTS-INTP-C40-K9 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems 12000/6-DC | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems WS-C3850-12XS-E
*New* Cisco AIR-CT5508-50-K9 Wireless Controller 50 Access Points
NEW IN BOX CISCO NEXUS N3K-C3548P-10G MANAGED 48 x 1 Gigabit/10G **SHIP FAST**
Cisco CRS-16-PRP-12G CRS-16-LCC Performance Route Processor CRS-3 CRS-16/S 12GB
New Sealed Cisco UCS-E140D-M1/K9 UCS E140D M1 Server 1Year Warranty 2+Available
NEW SEALED CISCO WS-X4748-SFP-E 48-port SFP line card 1YearWarranty 2+Avalable
*New Sealed* Cisco N3K-C3548P-10G Nexus 3548 Switch, N3K-C3548P 48 SFP+
New Cisco Systems WS-C3650-48TD-E | incl 19% VAT | 2 years Cybertrading warranty
CISCO Mesh Patch Panel 15454-PP-MESH-8= 2RU 8-Degree Mesh Patch Panel 3YR WNTY
CISCO ONS 15454 ML100X-8 Ethernet Interface Card 15454-ML100X-8 3YR WNTY
*Good Condition* Cisco CRS-16-PRP-12G Line Card * Fast Shipment *
*New In Box* 2x Cisco WS-C3750X-48T-E * Fast Shipment *
Cisco CRS-16-PRP-12G Cisco CRS Series 16-Slot Performance Route Processor
Cisco WS-SVC-WISM2 Service Module
*Brand NEW* Cisco ISR4451-X/K9 Cisco ISR4451 Router with SL-44-IPB-K9
CISCO (WS-C3650-48FS-S) CATALYST 3650 48 PORT FULL POE4X1G UPLINK IP BASE WS-C36
*Good Condition* Cisco WS-SVC-WISM2 Wireless Service Module * Fast Shipment *
*New Sealed* Cisco WS-C3850-12X48UW-S CISCO 48 (12 MGIG+36GIG) UPOE Switch
Cisco WS-SVC-NAM-1-250S Network Analysis Module
*Brand NEW* CISCO WS-C3850-48U-S 48 UPOE ports Switch + C3850-NM-4-10G Module
***NEW Cisco WS-C3850-24S-S CISCO 24PT SFP GE SWITCH, IP BASE FEATURE SET
New Cisco Systems NM-8CE1T1-PRI | incl 19% VAT | 2 years Cybertrading warranty
New Cisco Systems ASA5550-K8 | incl 19% VAT | 2 years Cybertrading warranty
CISCO WS-C3850-12XS-E | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems 15310-CE-MR-6
Cisco 15454-CE-MR-10 Carrier Ethernet card - 10 port Multirate 10/100/1000 Mbps
ISR4451-X/K9 Cisco 4451-X Integrated Services Router *New/Sealed* Authentic
CISCO AS535XM-8T1-V-HC - AS5350XM Voice; 8T1, 8 AS5X-PVDM2-64, 512D/128F 3YR War
*NEW* L-LIC-CT5508-50A Cisco 50 AP Adder License for the 5508 Controller