Helpful relay multiplexer for High-Risk Applications
Reliable relay multiplexer Styles for Industrial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their entire range of relay multiplexer . They provide a total set of relay multiplexer solutions and other interrelated solutions. These units are noticed in various applications for example industrial applications, industrial manage circuits together with OEM Panels. These devices include fantastic precision and repeatability. The standard relay multiplexer which can be developed these days call for really small panel space.
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44470a relay multiplexer
usb relay multiplexer
The Plugable USB2-SWITCH2 USB 1.1/2.0 switch is the ideal solution for one-touch switching of access between two computers to a USB-based mouse, printer, scanner, hard drive, or any other attached USB 1.1/2.0 device. Attach a powered USB hub to the USB2-SWITCH2 instead of a single device for switched access to everything connected to the hub.
The USB2-SWITCH2 works without drivers on any USB-enabled computer (Windows, Mac, Linux, etc.). Connect two computers to the switch via the included five-foot USB A/B cables, attach either a single USB device or a USB hub connected to multiple USB devices (cable not included for switch-to-device/hub attachment), and start enjoying the benefits of switched access. Driver installation for the attached devices may be required on the connected computers.
A single button press is all that's required to change control of the attached devices between the connected computers. LED indicator lights show which connected computer has control.
For anyone considering a KVM switch to provide two-computer access to a single keyboard, mouse, and display, the same result is possible with the Plugable USB2-SWITCH2. Just attach the switch to a powered USB hub that's connected to a keyboard, mouse, and USB graphics adapter for an all-USB KVM solution.
The switch can connect USB 1.1/2.0-compliant devices and hubs, but to function in USB 2.0 speed mode, the connected computer and attached device or hub both must comply with the USB 2.0 standard.
What's in the Box
One Plugable USB2-SWITCH2 compact USB 1.1/2.0 switch with two USB-B female ports and one USB-A female port
Two five-foot USB A/B cables for connecting two computers to the switch
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Anonymous asked In telecommunications, how are balanced lines and four wire working related with each other?
Could anyone explain to me what four wire working in telephone networks and balanced lines have to do with each other? How is a telephone hybrid capable of doing 2-wire to 4-wire conversion? Please no cutting and pasting from the web pages.. And please answer only if you are a pro in this topic. Don't browse the net for the answers and give your opinion. I surfed the web for days to find an answer but nothing helped me with my question. Thank You.
And got the following answer:
The plain old telephone lines to a subscriber's premises are balanced pairs, as this eliminates a variety of interference. The same applies to trunk lines between locations. In fact with many subscribers in the same cable it is not possible to use an unbalanced system. Everyone would be talking to each other. The design of cables and open wire lines is made carefully to maintain this balance, using twisted pairs as well as a transposition scheme of twisting groups of pairs. Balanced lines are also much less prone to the effects of surges from nearby power lines and lightning. Balanced means the two wires carry the same current through the circuit, as opposed to using a common wire or ground to complete the circuit. This does not mean the circuit is not grounded, though the grounds or DC voltages are connected in a balanced way (at the exchange end) using a relay with two coils or a center tapped transformer. This is two wire working, because the 2 wires carry both directions of the conversation in a metallic circuit. Balanced to unbalanced conversion is made using a transformer. This is necessary to connect lines to amplifiers, which tend to be unbalanced internally. When there needs to be an amplifier for overcoming the losses due to greater distances, the signal through the amplifier is one way - so there has to be a separate circuit for each direction. This applies for carrier (multiplexer) systems or a radio circuit or generally fiber optics or mobile phones too. The signal is not able to pass through the equipment in both directions. Sometimes these are called derived circuits, as they use the equipment to derive one or more channels through a different medium. There needs to be a go and a return path, separately, because the transmit and receive directions use different equipment. Think about radio tx and rx as an example. This is called a 4 wire circuit. Two sets of balanced lines. At the subscriber's telephone this situation occurs in a way too, because the microphone and the earpiece need to connect to the same two wire line without the speaker's voice being too loud - louder than the distant voice... The interconnection is achieved by a hybrid transformer in the classic sense, though nowadays it might be a similar device using amplifiers in a bridge configuration to balance out the directional signals, or even a part of a digital signal processing system. The first link below shows both analogue types for a simulation. The line impedance is matched against the balance network. In the subscriber's handset this is deliberately mismatched in the ASTIC (anti sidetone induction coil) which is a simplified hybrid, so that at least some of the speaker's voice will be heard in the earpiece, but it is suppressed. I disagree with one point in the first link below. The line is not normally powered through the hybrid. The line current would mean much bigger transformers are needed for the two transformer type. There is a separate transformer or 2 coil relay on the 2 wire line to feed the DC to the subscriber's line, and blocking capacitors if required. In early 2 wire line voice repeaters, the repeater was two amplifiers (one for each direction) with a hybrid on both sides. The hybrid rejection allowed about 18dB gain in each direction before feedback became a problem. This depends on balancing the line against the balance network. The second link shows and explains 2 transformer and 1 transformer hybrids, and explains the single transformer can be used when the 4W circuit is unbalanced, as when the equipment connects directly to the hybrid. Explanation.. In the second link, look at the image for "Wiring diagram of a double transformer hybrid". In this diagram, W is the 2W line, and Y is the balance network. X and Z are 4W transmit and receive respectively. All the windings are the same, say 600 ohms, as are impedances W and Y. Redraw it with the proper names. Now consider a signal from X = 4W receive to W = 2W line via the top transformer. It is coupled through the line impedance to the bottom transformer, and without the balance network would appear in Z = 4W transmit. The two windings connected to W = 2W line are similar to the two windings connected to Y = balance network except that the balance network has one winding reversed. This forms a balanced bridge balancing the line against the balance network, so the the 2W receive signal is cancelled in the 2W transmit port. A signal from the 2W line splits equally between the transmit and the receive ports, but is stopped by the receiver being a 1 way device so goes towards the transmit port with a 3dB loss. The important point is there is a high loss between the 4W receive and 4W transmit, up to 40dB with suitable matching and balancing.
The relay multiplexer perform really well with distinct applications that are specific to power distribution and protection. The relays come with wide adjustment ranges using a scale that is certainly easy to read either in 3 or 4 digits based on the model. These relay multiplexer enable in rising the flexibility of the applications, lessen the overall power and maintenance fees. There are actually relays that are used for general purposes which come in reputable designs with quick replacement selections. And you’ll find models that are employed for industrial applications and heavier duty applications that function on substantial loads. These solutions are produced to meet the lifetime industrial manage requires with the applications.
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