CIMR-AU4A0058FAA變頻器
CIMR-AU4A0058FAA變頻器
CIMR-AU4A0058FAA變頻器
PLC網絡是由幾級子網復合而成，各級子網的通信過程是由通信協議決定的，而通信方式是通信協議核心的內容。通信方式包括存取控制方式和數據傳送方式。所謂存取控制（也稱訪問控制）方式是指如何獲得共享通信介質使用權的問題，而數據傳送方式是指一個站取得了通信介質使用權後如何傳送數據的問題。
1．周期I/O通信方式
周期I/O通信方式常用於PLC的遠程I/O鏈路中。遠程I/O鏈路按主從方式工作，PLC遠程I/O主單元為主站，其它遠程I/O單元皆為從站。在主站中設立一個“遠程I/O緩衝區”，採用信箱結構，劃分為幾個分箱與每個從站—一對應，每個分箱再分為兩格，一格管發送，一格管接收。主站中通信處理器採用周期掃描方式，按順序與各從站交換數據，把與其對應的分箱中發送分格的數據送給從站，從從站中讀取數據放入與其對應的分箱的接收分格中。這樣周而復始，使主站中的“遠程I/O緩衝區”得到周期性的刷新。
在主站中PLC的CPU單元負責用戶程序的掃描，它按照循環掃描方式進行處理，每個周期都有一段時間集中進行I/O處理，這時它對本地I/O單元及遠程I/O緩衝區進行讀寫操作。PLC的CPU單元對用戶程序的周期性循環掃描，與PLC通信處理器對各遠程I/O單元的周期性掃描是異步進行的。盡管PLC的CPU單元沒有直接對遠程I/O單元進行操作，但是由於遠程I/O緩衝區獲得周期性刷新，PLC的CPU單元對遠程I/O緩衝區的讀寫操作，就相當於直接訪問了遠程I/O單元。這種通信方式簡單、方便，但要佔用PLC的I/O區，因此只適用於少量數據的通信。
2．全局I/O通信方式
全局I/O通信方式是一種串行共享存儲區的通信方式，它主要用於帶有鏈接區的PLC之間的通信。
全局I/O方式的通信原理如圖7-27所示。在PLC網絡的每臺PLC的I/O區中各劃出一塊來作為鏈接區，每個鏈接區都採用郵箱結構。相同編號的發送區與接收區大小相同，佔用相同的地址段，一個為發送區，其它皆為接收區。採用廣播方式通信。PLC1把1＃發送區的數據在PLC網絡上廣播，PLC2、PLC3收聽到後把它接收下來存入各自的1＃接收區中。PLC2把2＃發送區數據在PLC網上廣播，PLC1、PLC3把它接收下來存入各自的2＃接收區中。PLC3把3＃發送區數據在PLC網上廣播，PLC1、PLC2把它接收下來存入各自的3＃接收區中。顯然通過上述廣播通信過程，PLC1、PLC2、PLC3的各鏈接區中數據是相同的，這個過程稱為等值化過程。通過等值化通信使得PLC網絡中的每臺PLC的鏈接區中的數據保持一致。它既包含著自己送出去的數據，也包含著其它PLC送來的數據。由於每臺PLC的鏈接區大小一樣，佔用的地址段相同，每臺PLC只要訪問自己的鏈接區，就等於訪問了其它PLC的鏈接區，也就相當於與其它PLC交換了數據。這樣鏈接區就變成了名符其實的共享存儲區，共享區成為各PLC交換數據的中介。
圖7-27 全局I/O方式的通信原理
鏈接區可以採用異步方式刷新（等值化），也可以採用同步方式刷新。異步方式刷新與PLC中用戶程序無關，由各PLC的通信處理器按順序進行廣播通信，周而復始，使其所有鏈接區保持等值化；同步方式刷新是由用戶程序中對鏈接區的發送指令啟動一次刷新，這種方式只有當鏈接區的發送區數據變化時才刷新。
全局I/O通信方式中，PLC直接用讀寫指令對鏈接區進行讀寫操作，簡單、方便、快速，但應注意在一臺PLC中對某地址的寫操作在其它PLC中對同一地址只能進行讀操作。與周期I/O方式一樣，全局I/O方式也要佔用PLC的I/O區，因而只適用於少量數據的通信。
3．主從總線通信方式
主從總線通信方式又稱為1：N通信方式，是指在總線結構的PLC子網上有N個站，其中只有1個主站，其它皆是從站。
1：N通信方式採用集中式存取控制技術分配總線使用權，通常採用輪詢表法。所謂輪詢表是一張從機號排列順序表，該表配置在主站中，主站按照輪詢表的排列順序對從站進行詢問，看它是否要使用總線，從而達到分配總線使用權的目的。
對於實時性要求比較高的站，可以在輪殉表中讓其從機號多出現幾次，賦予該站較高的通信優先權。在有些1：N通信中把輪詢表法與中斷法結合使用，緊急任務可以打斷正常的周期輪詢，獲得優先權。
1：N通信方式中當從站獲得總線使用權後有兩種數據傳送方式。一種是只允許主從通信，不允許從從通信，從站與從站要交換數據，經主站中轉；另一種是既允許主從通信也允許從從通信，從站獲得總線使用權後先安排主從通信，再安排自己與其它從站之間的通信。
4．令牌總線通信方式
令牌總線通信方式又稱為N：N通信方式是指在總線結構的PLC子網上有N個站，它們地位平等沒有主站與從站之分，也可以說N個站都是主站。
N：N通信方式採用令牌總線存取控制技術。在物理總線上組成一個邏輯環，讓一個令牌在邏輯環中按方向依次流動，獲得令牌的站就取得了總線使用權。令牌總線存取控制方式限定每個站的令牌持有時間，保證在令牌循環一周時每個站都有機會獲得總線使用權，並提供優先級服務，因此令牌總線存取控制方式具有較好的實時性。
取得令牌的站有兩種數據傳送方式，即無應答數據傳送方式和有應答數據傳送方式。採用無應答數據傳送方式時，取得令牌的站可以立即向目的站發送數據，發送結束，通信過程也就完成了；而採用有應答數據傳送方式時，取得令牌的站向目的站發送完數據後並不算通信完成，等目的站獲得令牌並把應答幀發給發送站後，整個通信過程才結束。後者比前者的響應時間明顯增長，實時性下降。
5．浮動主站通信方式
浮動主站通信方式又稱N：M通信方式，適用於總線結構的PLC網絡，是指在總線上有M個站，其中N（N＜M＝個為主站，其餘為從站。
N：M通信方式採用令牌總線與主從總線相結合的存取控制技術。首先把N個主站組成邏輯環，通過令牌在邏輯環中依次流動，在N個主站之間分配總線使用權，這就是浮動主站的含義。獲得總線使用權的主站再按照主從方式來確定在自己的令牌持有時間內與哪些站通信。 一般在主站中配置有一張輪詢表，可按輪詢表上排列的其它主站號及從站號進行輪詢。獲得令牌的主站對於用戶隨機提出的通信任務可按優先級安排在輪詢之前或之後進行。
獲得總線使用權的主站可以採用多種數據傳送方式與目的站通信，其中以無應答無連接方式速度快。
6.CSMA/CD通信方式
CSMA/CD通信方式是一種隨機通信方式，適用於總線結構的PLC網絡，總線上各站地位平等，沒有主從之分，採用CSMA/CD存取控制方式，即“先聽後講，邊講邊聽”。
CSMA/CD存取控制方式不能保證在時間周期內，PLC網絡上每個站都可獲得總線使用權，因此這是一種不能保證實時性的存取控制方式。但是它採用隨機方式，方法簡單，而且見縫插針，只要總線空閒就搶著上網，通信資源利用率高，因而在PLC網絡中CSMA/CD通信法適用於上層生產管理子網。
CSMA/CD通信方式的數據傳送方式可以選用有連接、無連接、有應答、無應答及廣播通信中的每一種，可按對通信速度及可靠性的要求進行選擇。
以上是PLC網絡中常用的通信方式，此外還有少量的PLC網絡採用其它通信方式，如令牌環的通信方式等。另外，在新近推出的PLC網絡中，常常把多種通信方式集成配置在某一級子網上，這也是今後技術發展的趨勢
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Cisco Systems 15216-AD4-2A-60.6
Cisco Systems NAC3315-100FB-K9
New Cisco Systems AS54-DFC-CT3 | incl 19% VAT | 2 years Cybertrading warranty
Cisco Systems ME2600X-44FE-D-K9
Cisco Systems WS-6509EXL-2FWM-K9
Cisco Systems VS-C6509VE-S72010G
Cisco Systems 7606-AC-BUN
Cisco Systems MCS7845I1-K9-CMA2
Cisco Systems MCS-7845-I1-UC1
Cisco Systems MCS-7845-I2-CCX1
Cisco Systems MCS-7845-I2-CCX2
Cisco Systems MCS-7845-I2-IPC2
Cisco Systems MCS7845I2-K9-CMA2
Cisco Systems MCS7845I2-K9-CMB1D
Cisco Systems MCS7845I2-K9-CMC2
Cisco Systems MCS-7845I2-K9-UCA1
Cisco Systems MCS-7845-I2-MOB1
Cisco Systems MCS-7845-I2-UC1
Cisco Systems MCS7845I1-K9-CM50
Cisco Systems MCS-7845-I2-CCE4
Cisco Systems WS-C4510R-E
NEW SEALED Cisco RSP720-3C-10GE Route Switch Processor 1YearWrn 2+Available
!NEW IN BOX ! Cisco ASR1000-ESP40 ASR1000 Embedded Services Processor *SHIP FAST
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
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