1785-L60B/E模塊_漳州鼎晟達自動化設備有限公司

1785-L60B/E模塊

摘要】本文首先介紹了國產NA400 PLC可編程控制器的係統體係結構及配置，重點從編程與調試環境、係統通信網絡、係統可靠性設計、針對水電廠的設計、性能價格比等方面介紹了NA400可編程控制器的技術特點，後介紹了以NA400可編程控制器為核心控制平臺的工程應用實例。NA400可編程控制器與傳統PLC相比在順序控制圖編程、特色功能塊、係統的開放性和可靠性等方面具有明顯的特點。

【關鍵詞】國產可編程控制器NA-PLC NA400技術特點工程應用水利水電

1、引言

　　可編程控制器作為一種通用工業控制器，廣泛應用於各種工業控制領域。目前中國PLC市場主要廠商為Siemens、Mitsubishi、Omron、Rockwell、Schneider、GE-Fanuc等國際大公司，歐美公司在大、中型PLC領域佔有優勢，日本公司在小型PLC領域佔據十分重要的位置，韓國和中國臺灣的公司在小型PLC領域也有市場份額，大陸國產PLC的市場份額幾乎可以忽略。國內曾有研究單位開發PLC產品，後因種種原因沒有發展起來。值得欣慰的是，國內已有公司開始拓展PLC業務，並在中國PLC市場有了聲音。但其產品主要集中在低端小型PLC上，在大中型PLC研究上國內尚無具有自主知識產權的產品。

　　南大傲拓科技多年來一直致力於可編程控制器的研究，產品涵蓋從小型一體化PLC到大型PLC的全係列產品，公司在水利、水電、水處理、重型裝備業、物流等等控制領域得到廣泛應用。NA400可編程控制器由南大傲拓科技江蘇有限公司自主設計與研發，本產品已獲得CE認證，並將進行FC認證和船級社認證，已獲得專利和軟件著作權多項。NA400可編程控制器和同類產品相比具有明顯的優勢，主要表現在：係統體係結構先進，模塊安裝位置靈活，內部通信網絡採用現場總線，打破國外同檔次PLC採用多總線的模式，大大提高了PLC的抗幹擾能力和環境適應能力。國內一套自主開發的支持IEC61131-3國際標準的軟件係統，並具有的順序控制圖編程語言。該PLC具有在線監視、在線修改、在線調試、在線倣真等功能，方便用戶的開發與調試。

　　NA400可編程控制器採用了嵌入式軟件、硬件技術和現場總線技術等技術開發的。針對不同的應用開發了NA600大型PLC、NA400中大型PLC、NA200小型PLC等多種不同類型的PLC，分別應用於大型水電站、中小型水電站及輔機、閘門等不同的應用場合。本文將從NA400可編程控制器體係結構、係統配置、技術特點、工程應用實例等幾方面介紹NA-PLC及水電廠的應用。

2、NA400可編程控制器體係結構與特點

2.1 體係結構：

　　NA400可編程控制器採用LAN/FieldBud係統體係結構（如圖1所示），提供標準的以太網接口完成與上微機係統的通信，通信規約採用開放的、標準ModBus TCP規約。CPU模件和I/O模件之間採用現場總線作為內部總線及擴展總線，現場總線特有的高可靠性和對現場環境的適應能力，使得NA400可編程控制器係列PLC係統配置的靈活性和可靠性也大大提高。圖1以雙CPU雙以太網熱備冗餘、單CPU雙以太網和單CPU雙以太網三種典型的應用。為水電廠的應用提供靈活的係統配置方式，適用於更加廣泛的現場應用。

2.2 係統配置：

　　NA400可編程控制器提供三種係統配置，包括單CPU單以太網模式、單CPU雙以太網冗餘模式、雙CPU冗餘模式，多種靈活的係統配置模式可以地適用多種不同的實際應用。提供了多種類型模件包括電源模件、三種不同類型的CPU模件、串口通信模件（提供8個標準的RS232/RS485）、開關量輸入模件、SOE模件、開關量輸出模件、模擬量輸入模件（電流型和電壓型）、溫度量模件等。

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【主營產品】

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5：Schneider Modicon（施耐德莫迪康）：Quantum 140係列處理器、控制卡、電源模塊等。

6：ABB：工業機器人備件DSQC係列、Bailey INFI 90等。

7：Siemens(西門子)：Siemens MOORE， Siemens Simatic C1，Siemens數控係統等。

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13：Woodward（伍德沃德）：SPC閥位控制器、PEAK150數字控制器。

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CISCO ROUTER 2801 -- C2801-IPVOICEK9-M (Ricondizionato - Refurbished)

New Cisco ASA5545-FPWR-K9 Adaptive Security Appliance FirePower Srvc ASA5545-X

#NEW# Cisco 7600-SIP-200 600 Series SPA Interface Processor #FAST SHIPMENT#

ROUTER CISCO 1751-RICONDIZIONATO REFURBISCHED

APP. VOIP CISCO (LEGGERE DETTAGLI PREZZI) Vari 7911-31-61-14 (Usati-Refurbished)

NEW CISCO Linksys (SE1500) 5-Port-Ports External Ethernet Switch

ROUTER CISCO 887 IAD (Integrated Access Devices) ADSL2+ (NUOVO - NEW)

NEW Cisco AIR-ANT5145V-R 5GHz 4.5dBi Diversity Omni Ceiling Mount AntennaRP-TNC

CISCO ROUTER 1803 (NUOVO - NEW)

Cisco Catalyst 3560 PoE Switch WS-C3560-48PS-S V09 w/ Rack Mount

NEW IN BOX CISCO C6800-8P10G Catalyst Gigabit Ethernet Fiber Module *SHIP FAST*

|New| Cisco SPA504G 4-Line IP VoIP Telephone

LOT OF 5 CISCO 8A/S 8-PORT ASYNC/SYNC SERIAL MODULES

Cisco 3700 Series

CISCO LINKSYS SR2024 24-PORT GIGABIT SWITCH

CISCO887VA-M-K9 ADSL ADSL2+ Annex M VPN Router ADVSECURITY LICENSE CISCO 880

Cisco Compatible SFP-H10GB-CU5M, SFP+ Twinax Cable, 5-Meter, 10GBase-CU

CISCO887VA-M-K9 ADSL ADSL2+ Annex M VPN Router ADVSECURITY LICENSE CISCO 880

Cisco Compatible SFP-H10GB-CU5M, SFP+ Twinax Cable, 5-Meter, 10GBase-CU

Lot of 7 Cisco IP Phone CP 7960G VoIP Business Phones

#NEW# Cisco SPA-8X1GE-V2 8-Port Ethernet Shared Port Adapter #FAST SHIPMENT#

NEW Sealed Cisco N7K-F248XP-25E Nexus 7000 Enhanced F2-Series 48 Port Module

Lot of 3 Linksys / Cisco SD208 8-Port 10/100 Switch w/ POWER SUPPLIES VER. 1.1

Lot of 5 Cisco IP Phone CP-7941G Unified VOIP Phones

Cisco ASA5515-K9 ASA5515-X Security Plus Firewall Rackmount V02

Cisco Systems Catalyst 2960G Series WS-C2960G-24TC-L V04 Rack Mountable Switch

Lot of 8 Cisco IP Phone CP-7941G Unified VOIP Phones

Cisco SRP541W (Small Business) 3g Ready, 2 x WAN, 4x FXS, 1 x FXO, 2 x USB VPN

Cisco Edge 340 Series Display Mount Kit Assembly

*LOT OF 50* CISCO 128MB PC-133 SDRAM-133 168p Server Memory - 15-9247-01

CISCO 2960S - 24 Gigabit Port Switch +2 1G SFP Ports (WS-C2960S-24TS-S/)

For Cisco SFP-10G-LR SFP+ LR Transceiver 10GbE Optical Transceiver Module

WS-C3550-48-SMI - Cisco Catalyst 3550 48-Ports External Managed Switch w/ Ears

* LOT OF 13 * 15-8294-01 - Cisco Viking 256MB PC2100 DDR-266 ECC Switch Memory

* LOT OF 2 * Cisco Intrusion Detection System Services Modules - WS-SVC-IDSM-2

15-8294 - Cisco Smart 512MB(2x256MB) PC2700 DDR-333 200p ECC Switch Memory Kit

* LOT OF 2 * DS-CAC-300W - Cisco MDS 9100 300W AC-DC Power Supplies SPACSCO-02

* LOT OF 5 * PA-1FE-FX - RJ-45 10/100Base-Tx Port Fast Ethernet Port Adapter

* LOT OF 3 * 15-8294-01 - Cisco SimpleTech 256MB PC2100 DDR-266 Switch Memory

* LOT OF 5 * PA-1FE-TX - RJ-45 10/100Base-Tx Port Fast Ethernet Port Adapter

DS-13SLT-FAB2 - Cisco MDS 9513 Hot Swappable Crossbar Switching Fabric Module

* LOT OF 2 * 34-0873 - Cisco Catalyst 4000 Ascom 400W Power Supplies - D0009237

WS-X5009 - HP Cisco 2-Port 100mb/s Base-TX Fast Ethernet Supervisor Engine

Cisco 2800 Series model 2811 Router

CISCO Catalyst 3750 24 10/100/1000T + IPB Image (WS-C3750G-24T-S/)

WS-CBS3020-HPQ - HP BLc3000 BLc7000 Cisco Catalyst 3020 Blade Switch 410916-B21

WS-X6608-T1 - Cisco Catalyst 6000 8-Port RJ-48 T1 WAN Switching Voice Module

SPA-2X1GE - HP Cisco 2-Port Gigabit Ethernet Shared Port Adapter - 47-17368-01

15-9599 - Cisco Viking 512MB PC-133U SDRAM-133 Server Memory - VI8BU647238ETE-SD

800-02691-02 - HP Cisco Fast Ethernet 100 Base-T Adapter Card for Cisco 7000

WS-X5530 - Cisco Supervisor Engine III w/ WS-U5533-FEFX-MMF

PA-MC-8T1 - HP Cisco 8-Port MultiChannel T1/PR1 Port Adapter Module w/ CSU/DSUs

WS-C2950-24 - Cisco Catalyst 2950 24-Port Fast Ethernet Switch IOS V12.1

SM732S8XE1MIEG1 - Cisco Smart 64MB 144p SO-DIMM Flash Memory for SUP720-3BXL

NME-WAE-502-K9 - Cisco WAAS 10/100/1000BaseT Network Module w/Hitachi Hard Drive

Cisco Linksys 5 Port High Speed Switch

Cisco IP Phone. 7940 Series.

Cisco Pix 501 Firewall

Cisco Catalyst (WS-C3750G-24TS-S) 24-Ports Rack-Mountable Managed Switch

Cisco Fast Ethernet NM-1FE-TX

Cisco Catalyst WS-C2975GS-48PS-L Switch Tested Number of Network Ports 48

Cisco IP CONFERENCE-STATION 7937G

CISCO CATALYST 2960 SERIES Switches + 2 GLC-GE-100FX= 100BASE-FX SFP

LOT of 3 Cisco ASA 5505 Series (2 V11+ 1 V05)

NEW IN BOX CISCO NEXUS N7K-F248XT-25E 7000 Enhanced F2-Series **SHIP FAST**

Cisco 48 Port 10-base-T Ethernet Switching Module WS-X5012A

Cisco WS-C3560X-48T-L Catalyst 3560X 48 Port Data LAN Base

Cisco HWIC-1GE-SFP Gigabit Ethernet High-Speed WAN Module for Cisco Routers

#NEW# Cisco WS-X45-SUP8-E Catalyst 4500 E-Series Supervisor 8-E #FAST SHIPMENT#

New Cisco Stack Cables *37-1122-01*

Cisco ACE 4710 Series (ACE-4710-K9 Application Control Engine

Cisco 1900 Series 1941 Router CISCO1941/K9

Cisco VIC3-4FXS/DID Four-Port Voice Interface Card - FXS and DID

#NEW# Cisco WS-X6908-10G-2TXL 6900 Series 8-Port Fiber Module #FAST SHIPMENT#

Cisco Catalyst (WS-C3750-48TS-S) 48-Ports Rack-Mountable Switch Managed stackab

NEW IN BOX CISCO 7600-SIP-200 7600 Series SPA Interface Processor **SHIP FAST**

CISCO ASR1006 V02 w/ 2DC, 2x ASR1000-RP1, 2x ESP20, SIP10, 2x SPA-2X1GE-V2

4 x Cisco Gigastack WS-X3500-XL Gigabit GBIC Interface Converters

Lot of (4) Cisco AP Aironet Mounting Kits 69-0869-01 - NEW

Cisco PA-FE-TX

Cisco Catalyst 2900 XL WS-C2924-XL-EN

Cisco 1841 inkl. 32MB CompactFlash Card

Cisco 1841 inkl. 32MB Compact Flash Card

Cisco 1841 inkl. 128MB CompactFlash Card

Cisco 1841 inkl. 64MB CompactFlash Card

Cisco 1841 inkl. 32MB Flash Card

Cisco Aironet 1200 Series AIR-AP1232AG-A-K9 Wireless Access Point

CISCO N7K-AC-6.0KW 341-0230-03 NEXUS 7000 SERIES AC POWER SUPPLY

CISCO GENUINE HWIC-2CE1T1-PRI WAN INTERFACE CARD

Cisco AIR-ANT2506 2.4GHz 5.2dbi Omnidirectional Mast Mount Antenna S2403B

Lot of 2 *NEW* Cisco Unified Color Display IP Phone CP-7945G

NEW Sealed Cisco 2901/K9 Router Never Opened Box 1 Year Warranty FreeShip. Qty 2

Cisco Small Business SF300-08, 8-Port 10/100 Managed Switch

Cisco VG224 Analog Phone Voice Gateway VoIP 24-Port

Cisco X2-10GB-SR TRANSCEIVER MODULES

Cisco X2-10GB-SR

Cisco Licence package LIC-CM-DL-10

Cisco Catalyst (WS-C3750-48TS-S) 48-Ports Rack-Mountable Managed Switch

Lot of (5) Cisco Aironet 5Ghz 3.5 dBi Swivel Dipole Black Antenna AIR-ANT5135D-R

CISCO WS-X6724-SFP-3BXL NEW SEALED

Lot of 10 Cisco CP-7921G-E-K9 Unified Wireless VOIP Phone

Cisco Catalyst Switch 2960 Series PoE-48 WS-C2960-48PST-L V04 +2 Months Warranty

Cisco Edge 300 CS-E300-K9 All-In-One 4-Port Ethernet Access Platform Switch HDMI

Cisco SL-29-UC-K9= Unified Communication Paper PAK License for 2901-2951 Routers

Cisco 1605R Router x 2

Cisco PIX-525 19" Rack Mount Kit, PIX-525-HW

Cisco PA-FE-TX Port Adapter 1-Port Fast Ethernet

Cisco SPA-2XT3/E3 2 Port Clear Channel T3/E3 Shared Port Adapter

Cisco WS-SVC-NAM-2 Network Analysis Module

Cisco PWR-C49M-1000AC 1000W AC Power Supply

Cisco 15454-TCC2P Timing, Communications & Control Card

Cisco 7600-SIP-200 Cisco SPA Interface Processor-200

Cisco 15454-OPT-AMP-17C

Cisco Systems Catalyst 2950 Series 48-Port Switch WS-C2950G-48-EI

Cisco C12000 2400W DC Power Entry Module 341-0054-01 / CNP3GKKBAA %

Cisco Aironet Power Injector LR - AIR-PWRINJ-BLR1

Cisco Stratacom BC-UFI-8T1/E1 DB15 ? 73-2444-02 Rev. D0 Back Card %

Cisco 34-0697-01 140W 3600 Series Power Supply / Delta Electronics DPS-140HB-1 %

Cisco WS-C6504-E Switch Chassis Only! (No fan / No Power)

Lot of 2 Cisco PWR-2700-AC/4 2700W AC Power Supply AA23420 / 341-0138-02

Cisco 1800 Series Model 1841 Integrated Services Router

NEW CISCO ATA187-I1-A SIP Analog Tel. Adaptor ATA186-I1 NEW

Astec / Cisco ? AA22150 ? 34-1740-02B0 ? CNP3A7JBAB ? Power Supply +

Cisco C12000 2400W DC Power Entry Module │ 34-1652-01 │ CNP3GK0BAA ^

Cisco RV110W-A-NA-K9 Small Business RV110W Wireless N VPN Firewall Router

Cisco Redundant Power System (RPS) 600 19" Rack Mount Kit

*Neuware NewSealed* CISCO C3KX-SM-10G (2Years Wntty) VATfree ?1680

Cisco SG200-50 48x +2x Combo Port Gigabit Switch compatible w. Linksys SLM2048T

CISCO 1921-SEC/K9 Router 2x Gbit, 2x EHWIC

Cisco WS-C2950SX-24 Catalyst 2950 Series 24-Port Switch 10/100/1000Base-SX

Cisco CP-7975G Unified IP Phone VoIP with Handset Power Brick and US Power Cord

Genuine Cisco C2960S-STACK FlexStack Module V02 Stacking Module New

CISCO 10Gbit SFP+ Transceiver Module (SFP-10G-LRM/)

Cisco Systems Ons 15454 Fan Tray WMUCATLFAA *

CISCO 2960S - 24 Gigabit Port Switch +2 10G SFP+ Ports incl Stacking Module (WS-

Cisco 7960 Unified IP VOIP Business Phone CP-7960G 6 Lines Tested Working

Cisco Systems PWR600-AC-RPS Redundant Power Supply +

Cisco CMSC 12-09-99 Fan Assembly ? 180212-00 B +

Cisco C6000 Fan Assembly ? 800-03085-01 A0 ? CNMYADYGAA +

Cisco CP-7965G 7965 VoIP phone Warranty More Available

Cisco AIR-WLC2106-K9 Wireless LAN Controller With 4 APs

Cisco WS-X6716-10G 16-Port 10GigE mit X2 modul Mod 6716 w/ DFC3C

Cisco Linksys EF4116 Ver. 2 16-Port 10/100 Exernal Ethernet Switch #

Cisco CRS-16-RP-B CRS-1 16-Slot Line Card Chassis Route Processor #

Cisco ONS 15454 12-Port E3 DS3 FMEC (T54) Network Module │ 15454E-E3DS3-FMEC ^

Cisco Catalyst 6500 / WS-C6500-E Supervisor Engine 32 WS-SUP32-GE-3B #

Cisco 2600 Series CISCO2651 2651 Wired Router W/ WIC-1DSU-T1 - No Face Plate #

Cisco ONS 15000 15216-FLA-8-60.6 8-CH Add / Drop Module │ 74-3202-01 ^

Cisco 10000 Performance Routing Engine ESR-PRE2 / ESR PRE-2 #

Cisco 3600 Series 3660 - 2x Cisco NM-HDV w/ 2x VWIC-2MFT-T1-DI & 4x PVDM12 #

Ebmpapst / Cisco ? Blower / Fan Unit ? 74-3451-01 ? CNUQABHAAA ? +

Cisco 6500 Series Catalyst WS-C6509-E Chassis WS-C6500-E w/ WS-C6509-E-FAN #

Cisco 10000 Performance Routing Engine ESR-PRE1 / ESR PRE-1 #

Cisco 30-0759-01 GBIC Module ( Lot of 12 ) +

Cisco WS-G5484 ? 30-0759-02 GBIC Module ( Lot of 12 ) +

Cisco 2800 Series 2811 Integrated Services Router w/ 64MB Flash - Cisco2811 #

Cisco WS-C3750G-24T-S V05 24 Port Gigabit Ethernet Network Switch 11-227

Cisco 881W IEEE 802.11n Wireless Integrated Services Router

Cisco WS-C3750G-24T-S V05 24 Port Gigabit Ethernet Network Switch 11-225

Cisco 7100/uBR7100 Series Router 19" Rack Mount Kit

Cisco GLC-SX-MM 1000BASE-SX SFP Transceiver Module

Cisco 3640 Router 19" Rack Mount Kit, ACS-3640RM-19

Cisco 48 port Gigabit SmartSwitch SLM2048 with SFP slots

Cisco PIX-4FE-66 Network Interface Card Refurbished

Cisco SOHO91 Router

VIC3-4FXS/DID=Cisco 4-Port FXS/DID Voice Interface Card

*NEW SEALED Neuware* CISCO WS-C3650-24TD-S (2Years Wnty) 3650 VAT Free ?1500

NEW Cisco SG300-52P-K9-NA SG300-52P Layer 3 Switch SG300 52 Port Gigabit PoE

Cisco WS-C3560X-48PF-S Switch 48 x PoE Gigabit Ports

SFP-H10GB-CU3M - CISCO CABLE COPPER TWINAX 3M

CAB-STACK-50CM - CISCO CABLE STACKWISE STACKING 50CM

WS-X6708-10G-3C - CISCO 8-PORT 10GB ETHERNET MODULE WITH DFC3C

C3K-PWR-750WAC - Cisco RPS2300 750W AC POWER SUPPLY

NEW CISCO SYSTEMS 69-1417-01 AIRONET MOUNTING HARDWARE KIT 1240AG!

Lot of 5 Cisco Rackmount Ears / Brackets P/N 700-00453-01

Lot of 8 Cisco Rackmount Ears / Brackets P/N 700-01170-02

Lot of 2 Cisco Rackmount Ears / Brackets P/N 700-08209-01

Cisco PWR-C45-1300ACV 1300W PoE & Data POWER SUPPLY 4506/4500 Many Available!

Lot of 4 Cisco Rackmount Ears / Brackets P/N 700-04794-01

Lot of 4 Cisco Rackmount Ears / Brackets P/N 42-0997-01

Cisco AS5400 Router 19" Rack Mount Kit, AS5400RM-19

Cisco WS-C4900M Cisco Catalyst 4900M Series Switch w/ Dual WS-X4908-10GE & Pwr

Cisco AS5300 Router 19" Rack Mount Kit, AS5300RM-19

NEW SG300-52P-K9-NA SG300-52P Layer 3 Switch SG300 52 Port Gigabit PoE Cisco

New Cisco IPTV-3432-ARCH , Archive Video Server BNIB originally sold for $15,000

CISCO Catalyst 2900XL Series 24-Port 100Mbps SWITCH Fully Managed, Rack-Mount

Cisco Catalyst 2900 24 Port 100Mbps Switch Fully Managed, Rack-Mountable

Cisco Catalyst 2950 Network Device

New Genuine Cisco SFP-10GB-SR

Cisco Small Business RV042 10/100 4-Port VPN Router

Cisco AS5200 Router 19" Rack Mount Kit, AS5200RM-19

Cisco Linksys SRW224G4 24-Port 10/100 + 4-Port Gigabit Switch

LOT OF 12 CISCO 48V POWER ADAPTERS w/ Pwr Cords 34-1977-05 (9), 341-0306-01 (3)

Cisco Linksys SRW224G4 24-Port 10/100 + 4-Port Gigabit Switch

Cisco AC Power Adapter w/ Switch LR-888 37-1070-01

Cisco 7914 Key Expansion Module KEM 7960G 7961G 7970G 7971G-GE CallManager CUCM

Cisco 8945 IP Phone (NEW Communications Manager Call CUCM) CP-8945-K9= Video NIB

NUOVO CISCO DS-SFP-FC4G-SW= 4 GBPS FIBRE CHANNEL-SW SFP LC SP

Cisco HWIC-3G-HSPA

#NEW# Cisco WS-C3560V2-24TS-S 24 Port 2x1G SFP IP Base Switch #FAST SHIPMENT#

New Sealed Cisco VWIC3-1MFT-T1/E1 1-Port T1/E1 Multiflex Trunk Voice/WAN Card Qt

Lot of 2 Cisco ws-x3500-xl Gigastack GBIC transceivers

lot of 2 Cisco 30-0759-01 1000 Base -SX 850 Nm GBIC ws-g5484

Genuine Cisco EHWIC-4ESG 4-Ports Gigabit Plug-in Switch Module NEW/SEALED EHWIC

Cisco Catalyst (WS-C3550-24PWR-SMI) 24-Ports Rack-Mountable Switch Managed...

Cisco Catalyst 3560 Series Switch WS-C3560-48TS-S V02

NEW Cisco Meraki MR32-HW + LICENSE 802.11ac with Bluetooth Beacons Access Point

Cisco 887VA-SEC-K9 Secure router with VDSL2/ADSL2+ over POTS

Genuine Cisco WIC-4ESW Interface Module For 1721 1760 2600 2600XM 2691

Cisco C3850-NM-4-10G 4 x Gigabit Ethernet/4 x 10 Gigabit Ethernet network module

Cisco Catalyst WS-C3850-48U-E Stackable 48 10/100/1000Ethernet UPOE ports Switch

Cisco SR2016 16-Port 10/100/1000 Gigabit Switch SR2016 16x GB ports V02

Cisco ASR1004 19" Front and Rear Rack Mount Kit

Cisco CTS-CTRL-DV12 TelePresence Touch 12-inch device

New In Box, Cisco WS-C2960-24PC-L 24 POE 10/100+2 1000/SFP, LAN BASE