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i don't want an answer with link(s) only.. please explain in your words, and provide the link(s) as additional reference only.
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NicBrey&gt; ok, just tell me one last thing: what does P/S 2 means?? like ps2 mouse and keyboard.. let me know and i give u my pts straight away!
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First came the serial mouse that plugged into COM1 / COM2. That was replaced with the PS2 mouse with the small round plug. Nowadays you get USB mice that plugs into the USB ports. &nbsp;Essentially, the PS2 is also a serial port.<br />
<a href="http://www.ctips.com/ps2.html" rel="ugc">http://www.ctips.com/ps2.html</a>
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PS2 is another name for the mini-DIN connector, which was first introduced by IBM with their PS/2 PC systems. The PS/2 keyboard connector is mini-DIN 6 (has 6 pins inside the DIN shell) while the old AT-standard keyboard connector is DIN-5 (5 pins inside the shell) and the PS/2 mouse uses the exact same mini-DIN 6 connector as the PS/2 keyboard. &nbsp;A PS/2 mouse also uses the reserved IRQ 12 instead of a serial-port IRQ.
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Thanx for the points.<br />
<br />
A couple more tidbits - free of charge ;&gt;)<br />
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A router usually connects to the Internet using a device similar to a modem, called a dsu/csu or tsu (depending on the brand.)<br />
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Modem stands for what it does: MODulator/DEModulator. It translates a digital signal into an analog signal (modulate) to make it transferable over a standard, or POTS, phone line, then translates it back to digital (demodulate) on the other end. &nbsp;There are major limitations to this type of communication, and MODEMs usually max out at about 56,000 bits per second downstream, and 33,600 bits per second upstream. &nbsp;Although they are digital, the similar devices that connect ISDN, DSL and Cable data connections are also referred to as modems. &nbsp;Don't ask me why - they aren't the same thing - they don't modulate and demodulate over analog. &nbsp;Whatever... ;)<br />
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DSU stands for Digital Service Unit. &nbsp;CSU stands for Channel Service Unit. &nbsp;TSU is another acronym for DSU but it refers specifically to a T1 digital connection.<br />
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The DSU/TSU connects with a T1 or fractional T1. &nbsp;Each digital channel (hence the &quot;channel service unit&quot; part,) depending on the T1 frame type, provides either 56Kbits/second synchronous or 64Kbits/second synchronous bandwidth. &nbsp;Synchronous bandwidth means that the same data volume can travel in both directions at the same time. &nbsp;A full T1 will give up to 1.55 Mbit/s synchronous data flow. &nbsp;T3, OC1, OC3 and other digital transport media types have higher bandwidth, more channels, and higher cost.<br />
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In a WAN, you usually have a point-to-point or frame-relay connection, both of which are dedicated digital connections. &nbsp;More frequently you are seeing non-dedicated digital connections, lile DSL and Cable being used for WAN connections in conjunction with a VPN (virtual private network.) &nbsp;Although the device is called a &quot;DSL/Cable Modem&quot; it really is a form of DSU/CSU because the signal is not translated from digital to analog and back, but stays digital. &nbsp;A DSL/Cable router connects to a DSL/Cable Modem using an Ethernet-standard RJ-45 UTP cable. &nbsp;The only thing a DSL/Cable router is good for, IMHO, is allowing multiple devices to access the Internet concurrently through your DSL/Cable connection. &nbsp;Explaining VPN is for another TA... :)<br />
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A TSU or DSU/CSU will usually connect to a router for a WAN connection using a V.35 connection, which is a specific standard for digital information transmission. &nbsp;Sometimes, a V.35 connection can be made using a 25-pin D-sub connector rather than the standard Winchester block used in V.35. &nbsp;That does not make it an RS-232 connection, however, simply because the cable is using a 25-pin D-sub connector. &nbsp;The pinouts do not match, and the purpose and type of signals on those pins is different.<br />
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Some DSU/CSU or Digital Access Products also have POTS dial-up backup capability (with a built-in modem), and some actually do have an RS/232 connection, but those are specific to the devices and applications and have nothing to do with what the cable looks like.
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Thanks ShineOn ;) You're so nice! 
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<div class="content wysiwyg-content">
I'm damn regret now because i never pay attention to my networking class.. so, i need experts here to tell me in detail what it means by:<br />
<br />
1. RS 232<br />
2. parallel interface<br />
3. serial interface<br />
4. usb interface<br />
5. hub<br />
6. router<br />
7. how to differentiate usb, parallel and serial port?<br />
<br />
i allocate 50pts for each topic..<br />
<br />
Network Dummy
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I'm damn regret now because i never pay attention to my networking class.. so, i need experts here to tell me in detail what it means by:

1. RS 232
2. parallel interface
3. serial interface
4. usb interface
5. hub
6. router
7. how to differentiate usb, parallel and serial port?

i allocate 50pts for each topic..

Network Dummy

Basic Network question

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.