2/10/2023 0 Comments Throttled meaning in computer![]() In a P2P network, the throttle can poll accessory decoders to determine a turnout's position. An example this being used: If you just plugged in a throttle to the network, it doesn't know the status of anything. In a P2P network, any device can poll any other device for information. In some cases, it's nice to be able to still poll a device for information. To make it even more robust, not all devices on the network must be able to initiate communication, but they can. A device will attempt to transmit only when it has data it needs to pass on to another device. This frees bandwidth for data, because the command station does not keep the throttle network occupied with constant "anything to report?" queries. ![]() Instead, it's up to each device to update other devices about any status changes. With this network type, the command station does not ask individual devices if there is any new information as with a polled network. The data can be new locomotive instructions, throw a turnout, train location information, commands from a desktop computer controlling your layout, etc. Each device needs to be able to receive and transmit data. P2P is a network that relies on the computing power of the devices (throttles, accessory decoders, etc.,) in the network to function as both client and server. Keep in mind that although advanced, that does not make it hard to use or understand - in actuality, it can make things easier for the user as the complexity is handled by the hardware, not the user. Since this is the most advanced, there are significant advantages. ![]() ![]() The Peer-to-Peer (or P2P) is the most advanced type of network, and is found in today's modern business environment. A newly added throttle, or an inactive one, will be polled randomly to allow the command station to update its list of active devices.Īnother issue which can arise is network address conflicts: Two devices cannot share the same address on the bus, with some address ranges reserved for specific devices. This may be only a fraction of a second on a system with few devices, but as more devices need to be polled, the delay can increase. If you change the speed of a locomotive just after the command station polled your throttle, you have to wait until the next cycle to get the command from your throttle to the command station. The command station has to give every device an equal time slice, meaning the time between a device being polled increases.Īnother disadvantage is network delay. As more devices are added to the network, the time required to poll all the devices increases. In some designs, you'll have a separate network for accessory decoders, meaning more wires for a separate network for those devices, such as block detectors (determine if train is on a block) and turnout status from accessory decoders. While this type of network is adequate for several throttles, it is limited to several throttles. The command station constantly makes these queries, so the network is continuously busy. In a polled network the command station sequentially polls each device, asking if there is anything to report such as locomotive or function commands to turn on/off lights, change speed, etc. Think of it as "Speak only when spoken to." Don't worry, it'll be broken down for us non-computer science modelers:Ī polling network is the sequential interrogation of devices (throttles / accessory decoders) for various purposes, such as avoiding contention, determining operational status, or determining readiness to send or receive data. The following sentence is the computer science definition of polling. The advantage is that the throttles don't require the electronics needed for advanced communications, so the result can be significant upfront cost savings. The obvious disadvantage is a lot of wire is needed. In terms of 'networking' (or wiring), you have to have one wire for every throttle, plus a common. This is the lowest cost and most limited type of throttle system. It is an analog connection between the throttle and command station, which works much like analog throttles do. There are no digital signals ( digital packet) going over the wires. 1.4 Network Application by ManufacturerĪ hard wired network is like that which was used with Digitrax's original Challenger system, and MRC's Command 2000.
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