Sram Red

can i use CAMPAGNOLO Record deraileurs with SRAM RED components? I like everything about the SRAM RED group except the deraileurs. Can use CAMPY deraileurs and/or shifters with the rest of the components from the RED group? So according to some of the answers I've gotten, the important thing is that the shifter goes with the crank/cassett? Too bad... if you are basing the preference of derailleurs on looks I agree with you but SRAM Red derailleurs operate much nicer than Campys in my opinion. Anyway, to answer your question, SRAM and Campy are not compatible. EDIT: Aw, bad boy... the cable pull ratio is different on SRAM and Campy. The SRAM pulls too much cable (or not enough- I forget) and will force the Campy derailleur too far (or not far enough- I forget).

SRAM Red Doubletap 10-Speed Lever Set List Price: $556.00 Sale Price: $363.00 You save: $193.00 (35%) SRAM Red Rear Derailleur One Color, One Size List Price: $269.95 Sale Price: $215.96 You save: $53.99 (20%) SRAM Red GXP Crankset - No Cups (172.5 53-39T) List Price: $374.00 Sale Price: $299.70 You save: $74.30 (20%) 2008 SRAM Red GXP 172.5mm 39-53 Crankset, No cups CR2734/139695 Sale Price: $299.59 SRAM Red CT GXP Crankset - No Cups (172.5 50-34T) List Price: $374.00 Sale Price: $305.67 You save: $68.33 (18%) SRAM RED COMPACT CARBON CRANKSET 50/34, 172.5mm Sale Price: $319.59 SRAM Red Bicycle Short Rear Derailleur List Price: $339.99 Sale Price: $247.28 You save: $92.71 (27%) SRAM Red GXP 10sp cranks*, 34/50t - 165mm List Price: $372.00 Sale Price: $291.60 You save: $80.40 (22%) SRAM Red Ct GXP Crankset - No Cups (175 52-36T) Sale Price: $374.00 SRAM Red Ct GXP Crankset - No Cups (172.5 52-36T) Sale Price: $374.00 « Previous12345Next »

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SRAM Red Road Cassette 9spd 11 23t New in Box Rossetti Diablesse SM roadbike Sram Red full not Trek CNC Gold brakes New Lighter than SRAM RED 2010 Felt F2 Sram Red Dura Ace SRAM X0 XO PG990 REDWIN RED 9SP CASSETTE 11 32T MTB XC SRAM RED COMPACT CRANK ARMS SLIGHTLY USED SRAM Red Cycling Road Bike Crankset 53 39T 175mm Cranks SRAM RED COMPONENT GROUP 2009 Look 585 Optimum w 2010 Sram Red 51cm 200 miles SRAM RED CRANK 53 39 170MM SRAM RED CRANK 50 34 1725MM 2008 SRAM Red 8pcs Specialized Roubaix Pro 58 cm with Sram Red Force mix 08 SRAM RED CRANKSET BB30 170MM 130BCD 53 39TH GD COND Sram Red OG 1090 cassette 11x23 Brand New Specialized Roubaix PRO SL SRAM Red 52cm Fusee 25 SL SRAM Rival Crankset and BB with Sram Red Chainrings Brand New 2010 Sram Red Crankset w BB 2010 Sram Red Brakeset Brand New 2010 Sram Red Shifters Brand New 2010 Specialized Tarmac Pro SL Sram Red Compact 58 SRAM Red OG 1090 10spd Powerdome 11 28 cassette NEW SRAM RED GROUPSET SLIGHTLY USED Sram Red front Derailleur 10 speed 318mm clamp on SRAM Red Double Tap Shifter set NEW SRAM RED TT 900 CARBON AERO BRAKE LEVER SET Sram Red Crankset bb30 170mm 3953 RED TOKEN BB 86 Bottom Bracket CUPSET TBT Shimano SRAM SRAM RED DoubleTap Shifters Brake lever set LD4502 10sp NEW SRAM RED Carbon Crank Compact Crankset 50 34 110bc Specialized S Works Transition Profile designs Sram RED SRAM RED 50 34 175mm carbon crankset 2010 Jamis 54cm Xenith SL road bike SRAM Red bicycle NEW SRAM Red TT Triathlon Brake Levers Carbon NEW SRAM RED BRAKESET ROAD CALIPERS Brakes BEAUTIFUL Cervelo R3 SL w SRAM Red Group NEW Sram Rival Shifters 2x10 Red Hoods

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