Switch Hub
Switch Hub
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 Fast 8 Port 10 100 Mbps Ethernet Hub RJ45 LAN Network Switch  US $13.95
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 Baynetworks Baystack 250 10 100 hub router switch US $.99
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 5 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $4.00
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 8 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $15.39
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 Fast 5 Port 10 Mbps Ethernet Hub RJ45 Network Switch US $10.99
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 7 Port USB 20 HUB with LED Light ON OFF Switch 480Mbps Hi Speed for Laptop PC W US $6.98
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 8 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $13.21
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 5 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $12.92
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 4 Port USB 20 HUB with LED Light ON OFF Switch for Laptop PC 480 Mbps Hi Speed US $4.98
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 8 Port 10 100 Fast Ethernet Network LAN Switch hub NEW US $25.76
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 5 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $11.05
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 8 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $15.43
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 Encore 8 PORT 10 100MBPS N WAY SWITCH HUB 10BASE T US $9.80
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 Belkin F5U304WHT USB Plus Four Port 20 Hub Cables Switches BLKF5U304WHT US $47.90
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 USED SynOptics LattisRing 2715SA 16 Port Hub Switch NR US $10.00
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 3Com Superstack II 12 Ports External Network Switch Dual Speed Hub 500 US $9.99
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 8 Ports 10 100 1000M Gigabit Ethernet LAN Switch HUB Desktop 1000Mbps 1000M New US $49.88
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 CP Technologies LevelOne GEP 2450 Ethernet Switch 20 Port Hub GEP2450 US $687.39
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 100Mbps 10 100 8 Ports Ethernet Network Switch HUB US $109.58
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 Startechcom SV231HDMIUA 2 Port USB HDMI KVM Switch with Audio USB 20 Hub US $168.88
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 4port Ps2 USB Switchview Mm1 Kvm Switch USB 11 Hub W Audio US $206.95
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 4port DVI USB Switchview Kvm Switch USB 20 Hub W Audio US $210.95
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 TRIPP LITE B006 VUA4 K R 4 PORT KVM SWITCH W AUDIO 2 PORTs USB20 HUB CABLE US $190.53
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 4 port CCTV 10 100M PoE Switch Hub Device Power supply US $83.99
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 8 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $15.39
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 ZYXEL HUB GS108B 8PORT ETHERNET SWITCH GS108B US $51.12
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 3COM Super Stack II 24 port 24 port Desktop Switch Hub US $49.95
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 StarTechcom 2 Port USB KVM Switch with Network Hub and Audio KVM SV231USBAN US $142.99
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 Startechcom SV431USBAE StarTechcom 4 Port USB KVM Switch USB 20 Hub Kit US $117.33
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 5 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $9.90
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 ESC ESCA 8 PORT ACTIVE HUB 220V 110V AC COAX COAXIAL CABLE EXTERNAL SWITCH NET US $149.15
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 5 Ports 10 100Mbps Fast Ethernet Network Switch Hub US $12.89
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 Network Web Smart 8 Port 10 100M 1000M Ethernet LAN Switch Hub 1000M Pbs new US $48.98
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 SYBA CL U2MNHUB 4B USB 20 4 Port Mini Hub Black Color ON OFF Switch and LED US $17.03
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 SYBA CL U2MNHUB 4B USB 20 4 Port Mini Hub Black Color ON OFF Switch and LED US $17.03
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 3COM 3C16405 PS 40 SuperStack 2 12 Port Gigabit Ethernet Hub Switch Network US $104.33
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 8 Port 10 100 1000Mbps 10 100 1000M Giga Gigabit Network LAN Switch Hub US $47.99
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 Lot of 2 NETGEAR DS106 FS108 Switch Hub US $39.99
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 NEW StarTechcom 4 Port USB KVM Switch USB 20 Hub US $85.24
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 3COM Super Stack II PS hub 40 12 port switch 3C16405 US $19.99
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 4port Ps2 USB Switchview Mm2 Kvm Switch USB 20 Hub W Audio US $200.95
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 Intel Express 220T 24 Ports Stackable Ethernet Network Hub Switch EE220TX24 US $17.09
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 Startech 2 Port Usb Hdmi Kvm Switch W Audio Usb 20 Hub 2 X 1 2 X Mini US $159.94
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 NEW STARTECHCOM SV231HDMIUA 2 Port USB HDMI KVM Switch w Audio USB 20 Hub US $167.74
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 NEW Sun Microsystems Vixel Rapport 1000 7 Port GBIC Switch HUB1063 370 3012 02 US $199.99
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 NEW IOGEAR GCS1802 2 PORT KVMP SWITCH WITH USB 20 HUB AND AUDIO US $139.65
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 5 PORT 10 100MBPS FAST ETEHERNET LAN Network SWITCH Hub RJ45 Box Power Cables US $8.89
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 Cisco SG200 18 Ethernet Switch 18Port HUB SLM2016T NA US $288.88
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 Synoptics LattisRing 2712B 16 Port Hub Switch US $69.99
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 Startech SV231UADVI 2 Port DVI USB KVM Switch with Audio and USB 20 Hub US $132.99
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 GCS1802 2 Port KVMP Switch w USB Hub IOGear US $131.49
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 NETGEAR 16PORT HUB ETHERNET SWITCH JFS516NA US $78.88
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 Netgear 12port Hub ProSafe GSM5212P Ethernet Switch GSM5212P 100NES US $680.72
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 Belkin F5U307BRN 7 Port USB 20 Plus Hub Cables Switches BLKF5U307BRN US $55.49
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 Belkin F5U304BRN 4 Port USB 20 Plus Hub Cables Switches BLKF5U304BRN US $43.81
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 LinkBuilder FMS 3Com TP Hub 1627 1 12 Port Data Switch US $15.99
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 Startech SV231USBAN 2 Port KVM Switch with Ethernet Switch Audio USB Hub US $132.99
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 NEW 2 Port DVI USB KVM Switch with Audio and USB 20 Hub StarTechcom US $120.00
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 Avocent 2SVPUA10 001 SwitchView USB 2 port KVM switch with USB 11 Hub US $166.99
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 iPECS ES 1005 Ethernet Switch 5 Port HUB US $32.13
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 TP LINK TL SF1016D Ethernet Switch 16 Port HUB US $36.38
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 iPECS ES 1016 Ethernet Switch 16 Port HUB US $63.88
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 D Link DGS 1100 16 Ethernet Switch 16 Port Hub US $167.65
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 StarTechcom 4 Port USB KVM Switch USB 20 Hub SV431USBAE US $122.21
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 Lot of 2 LINKSYS INSTANT ETHERFAST EF4124 24 Port 10 100 ETHERNET HUB SWITCH US $45.00
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 D Link DSH 5 Dual Speed 5 port hub 10 100 SOHO Hub with Switch US $19.99
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 3COM HUB OFFICECONNECT Ethernet 10MBPS TPO 8 Ports Switch w AC Adapter 3C16700 US $27.95
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 Tripp Lite U225004R 4 Port USB Mini Hub Cables Switches TRPU225004R US $30.90
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 StarTechcom 2 Port USB HDMI KVM Switch with Audio and USB 20 Hub SV231HDMIUA US $167.99
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 IOGear GCS1802 2 Port KVMP Switch w USB Hub US $116.98
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 3COM 3C16411 24 Port Baseline 10 100 Fast Ethernet Hub Switch Network 3c US $85.36
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 IOGear 2 Port KVMP Switch w USB Hub MPN GCS1802 US $117.99
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 Cisco 300 SF302 08 Ethernet Switch HUB SRW208G K9 NA US $199.88
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 8 Port 10 100 new Fast Ethernet Network LAN Switch hub US $13.62
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 Io Gear Gcs1802 2 Port Kvmp Switch With Usb 20 Hub And Audio US $123.84
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 TRIPP LITE B006 VUA4 K R 4 PORT KVM SWITCH W AUDIO 2 PORTs USB20 HUB CABLE US $190.53
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 AVOCENT 4SVPUA20 001 4PORT PS2 USB SWITCHVIEW MM2 KVM SWITCH USB 20 HUB W AU US $207.87
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 AVOCENT 4SVPUA10 001 4PORT PS2 USB SWITCHVIEW MM1 KVM SWITCH USB 11 HUB W AU US $189.06
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 Startech SV211KDVI 2 Port USB DVI KVM Switch Kit with Cables USB 20 Hub US $101.99
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 Madge SH E16 Network Hub Switch 16 Port P N 820003 S NS3230525 Tested US $69.99
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 AVOCENT 4SVPUA10 001 4PORT PS2 USB SWITCHVIEW MM1 KVM SWITCH USB 11 HUB W AU US $189.06
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 AVOCENT 4SVPUA20 001 4PORT PS2 USB SWITCHVIEW MM2 KVM SWITCH USB 20 HUB W AU US $207.87
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 Ascend 8 Port MX18 8BRIS ISDN Switch Hub 0700 0350 001 US $94.83
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 AVOCENT 4SVDVI10 001 4PORT DVI USB SWITCHVIEW KVM SWITCH USB 20 HUB W AUDIO US $229.98
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 AVOCENT 4SVDVI10 001 4PORT DVI USB SWITCHVIEW KVM SWITCH USB 20 HUB W AUDIO US $229.98
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 2 Port KVMP Switch w USB Hub GCS1802 US $144.70
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 StarTechcom 4 Port DVI VGA Dual Monitor KVM Switch with Audio USB Hub SV431DD US $310.04
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 StarTechcom 4 Port Professional VGA USB KVM Switch with Hub SV431USB US $112.59
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 Belkin F1dd104l 4 port Soho Kvm Switch Dvi And Usb With Built in Usb 20 Hub US $183.35
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 SynOptics LattisHub 2804 10Base FL Network Hub Fiber Port 16 Port Switch US $265.00
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 SS2320 2 PC USB Switch Hub With File Transfer Function US $52.79
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 USED PULLOFF LAN PRO 10 BASE T ETHERNET HUB BNC SWITCH US $119.00
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 SOHOWare NDC Communications 10 100 Hub Switch NDS316 WITH AC ADPATER WARRANTY US $29.99
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 3COM SUPERSTACK II BASELINE HUB 3C16440 12 PORT SWITCH STACKABLE 1644 010 000 1 US $39.95
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 3Com 3C16792A OfficeConnect Dual Speed Switch 16 Hub US $39.50
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 ARK 8 Port 10 100 Switch HUB ES 308 E US $7.99
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 Netgear FS105 Fast Ethernet Hub Switch US $32.93
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 Madge SH E8 Network Hub Switch 8 PortSH EMA Module PR US $49.99
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 SMC EZ Switch Hub SMC 6305TX 10 100 5 port US $14.44
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 8 Port 10 100 Fast Ethernet Network LAN Switch hub NEW US $25.22
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Ethernet Switches?
Why Use Industrial Ethernet Switches?
1. Benefits of Industrial over Commercial Switches
Industrial Ethernet switches are housed in rugged industrial style steel enclosures using Din-Rail or panel mounting. Most commercial switches and media converters cannot mount conveniently inside equipment enclosures.
Another added benefit derived from using Industrial Ethernet switches is redundant power inputs. Commercial switches rely on a single power supply to power the switch, while Industrial switches typically run off DC power, and have redundant power inputs. This allows the weakest link (the power supply) to have a hot standby back up, insuring maximum up time.
Industrial Ethernet switches carry a Class I Div 2, group ABCD rating while the commercial counterparts do not. This allows the Industrial Ethernet switches to operate where explosive gases are being used (very typical for industrial applications).
2. Alternatives
Because Ethernet has been available in the office environment long before industrial Ethernet equipment existed, the equipment is well known for its performance and reliability and low cost. Quite often, when companies evaluate the technology, they do not examine the alternatives of purchasing Industrial Ethernet Switches versus commercial switches and routers. However, In this instance, the evaluation is simple. Fortunately, Industrial Ethernet switches provide advantages over the 4 primary alternatives being used. All of these alternatives utilize commercial Ethernet switches and hubs, and are listed below:
• Wire all connections to a climate-controlled environment.
In this scenario, the customer will place commercial network equipment in a climate controlled environment and run cable to every industrial Ethernet node. This is very costly and decreases reliability. Industrial Ethernet switches offers the opportunity to eliminate significant, expensive wiring efforts when compared to this approach.
• Build climate-controlled environments in harsh areas.
In this scenario, the customer, to reduce wiring costs, will build a climate-controlled environmental enclosure to house commercial equipment in a harsh environment (i.e. Nema 4 enclosures with Peltier coolers and bulkhead-mounted connectors). This is very costly and increases the number of components that can fail. Industrial Ethernet Switches can be installed directly in harsh locations, thus eliminating the need for expensive climate-controlled enclosures.
• Simply use commercial equipment without regard to environmental mismatches.
This is an alternative, but not a very good one. In this scenario, the customer utilizes commercial equipment in the harsh environment. This equipment is not rated for these environments and will probably fail and/or decrease the reliability of the system. In our discussions with customers utilizing this alternative, it was only implemented because they were not aware that industrial grade equipment was available. They are very open to utilizing Industrial Ethernet Switches.
In addition, many commercial switches use cut-through techniques, and can propagate bad packets on the network. However, Industrial switches use store and forward technology that perform CRC (cyclic redundancy checks), and insure the data Integrity of any packets being forwarded.
• Utilize Hubs instead of Switches
While hubs are cheaper than switches they do not eliminate collisions, and hence create determinism issues associated with Ethernet Networks. The following discussion illustrates the basic difference between switches and hubs.
Difference between Ethernet Switches and Hubs
A hub, also known as a repeater, is a simple device that connects Ethernet nodes. Hubs forward data packets they receive from a single workstation to ALL ports. All users connected to a single hub or interconnected hubs share the same bandwidth. As nodes are added to the network, they compete for a finite amount of bandwidth (typically 10 or 100 Mbs). Therefore, data collisions are guaranteed when a hub is used and network determinism (the ability to guarantee a packet is sent/received in a finite amount of time) is impossible. This is the primary reason Ethernet has historically not been accepted in control applications. Most control systems have a definite time requirement for packet transmission (< 100ms). This cannot be guaranteed with a hub and is especially if the network is busy. You can imagine the problems this can cause in a mission critical control application.
This is analogous to a single lane road. You cannot get onto the road until traffic is clear. With a hub, you cannot send a packet until network traffic is clear.
Another analogy is a party line phone. If you shared a party line phone with 8 users, anytime any of the users received a call; your phone would ring. All users would have to answer to determine if the call was for them. In addition, no other user can use the phone while someone else is using it.
An Industrial Ethernet Switch is a more complex device with built in intelligence to connect Ethernet nodes. The switch eliminates the problem of network determinism by providing full bandwidth with storage to a node or group of nodes. The switch eliminates all collisions that typically make Ethernet nondeterministic. A switch sends data only to the appropriate network port or segment, not the entire network as a hub does. The switch forwards data based on the MAC address (unique for each hardware device on the network) contained in the data packet. The switch must store the MAC addresses of every device it communicates with, requiring high-speed dual ported SRAM (hubs have no memory requirements). The switch determines the location of each node and establishes a temporary connection between itself and the node and terminates once the packet is transferred.
Using our highway analogy, we have turned the single lane road into an 8-lane highway. A lane can be dedicated to mission critical nodes insuring traffic can always get through in a pre-determined time.
Using the phone analogy, your phone rings only when the call is for you and you can use the phone when other people are using it.
Summary
In summary, an Industrial Ethernet Switch increases network bandwidth and provides network determinism for Industrial control applications, and provides the most cost effective solution for industrial environments. You can look up www.control-logic.com.au for detailed information on various options in Australia and their respective comprehensive product range.
About the Author
Leon Cowper has been selling electrical components and supplies through his store since 1996. Today he is an expert on all types of products and companies in the field.
www.control-logic.com.au
Do you need a Ethernet switch or hub when using only two computers for a LAN game?
I want to hook up only two computers to play a LAN game. Do I need to buy an Ethernet switch or hub, or can I just connect the two computers with one CAT5 cable?
A hub, or a switch, or a crossover cable (not a standard patch cable) will do if you are playing only a LAN game. If you were to include users on the internet as well, you would likely need a router with a switch. If you are only using 2 computers, your most viable solution is to buy a crossover cable as it is the cheapest. Connect both computers, and then in your network properties, select a static IP address. Give 1 computer 192.168.1.11 and the other 192.168.1.12. This will ensure they both can communicate with each other.
TRENDnet: Difference Between a Hub, Switch, and Router (802.11n) New to Networking
