J9145A HP Hewlett Packard Router

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Product Number: J9145A *

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Brand: HP

Description: New/NIB New J9145A 2910AL-24G SWITCH 24-Port LAN DEVICE New Manufacturers Warranty

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NPE-G2 Cisco Router

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Product Number: NPE-G2 *

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Brand: Cisco Systems

Description: New/NIB New NPEG2 NEW Cisco 7200VXR NPE-G2 Network Processing Engine NPEG2 New Manufacturers Warranty

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CISCO2801 Cisco Router

 

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Part Number: CISCO2801 *

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Brand: Cisco Systems

Description: New Cisco 2801 Ac Power 2fe 2hwic 2aim Ip Base Router

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Different types of server rack shelfs

A rack or a shelf is simply a standardized frame structure for loading server modules or computing or industrial equipment. All the industrial equipment, computing and server equipment is designed in standardized dimensions of the rack shelf. The standard dimensions are multiples of 1.75 inches. It is also called one rack unit or 1U. The typical size for industrial equipment rack shelf is 42U. Professional 19 inch racks are always made for home equipment like audio devices, amplifiers and sound effects units like mixers. They are very widely used for mounting computer server equipment so that these heavy hardware configurations do not occupy much floor space or shelf space. Some computer server shelf are equipped with cooling units so that the servers do not overheat. These rack shelves are also used for mounting networking equipment like switches and heavy routers and hardware filtering units in large networks.
By: Sandeep Mahanthi

What Does A Modem Do?

Modem and router are two different networking hardware equipments. Modem is a modulation device, that is, a modem can modulate and demodulate data. We know that data can be either analog or digital. In computer networking, the data to be used in the computer needs to be digital but the data that is used in the networking can be analog.

For example, while connecting to the Internet by using a telephone line, the data in the networking process, that is, the data from the telephone line are analog. Now, the analog data needs to be converted to digital for processing in computer and digital data needs to be converted to analog to send from computer via the telephone line again. This conversation is the modulation and demodulation processes and the job of modem is basically to convert analog data to digital and digital data to analog.

The job of router, however, is quite different. A router does not change one kind of data to another kind. It simply forwards the data. Router works on a group of data, which are normally called as packets, and forwards the packets across the network.

By: Eric