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Archived — Networking Technology

Power over Ethernet and Fiber Optic Networks

Traditional Telephony VoIP and PoE Voice over IP is a network-based telephone service. Since VoIP doesn’t derive it’s power from the telephone company central office, other means of backup power are needed. Power Over Ethernet was originally intended to provide VoIP with a source of backup power. It simulates the traditional telephone’s availability during power outages and provide 911 service at all times. PoE-IEEE 802.3af provides 48Vdc power over 2 of 4 available pairs on Category UTP cable. After line loss, about 13W of power are available VoIP and Fiber VoIP and PoE are complimentary but they are not codependent.

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What is the relationship between MHz and Mbps ratings of a fiber optic cable?

MHz is the frequency or rate at which a wave will cycle per second. 1 Megahertz would be equal to 10^6 Hertz or 1 million cycles per second.

Mbps refers to the how many bits of data is transmitted trough a media (such as fiber optic cable) per second.

MHz and Mbps are not equal, the confusion occurs because MHz works with analogue signals while a data transfer occurs digitally.

Transferring data rate (Mbps) to a cable is dependent upon encoding techniques. “Manchester” encoding is used for Standard Ethernet (10 Mbps), which is a two-level encoding technique that requires a minimum of 10 MHz. Cat3 copper cable offers 16 MHz and is why it was acceptable for Standard Ethernet.

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Network Communication Speed Comparison Chart

As the demand for faster speeds has grown rapidly over recent decades, new communications networking equipment and systems are constantly being developed to accommodate these requirements .  A result of these efforts is a series of established networking protocols and terminology that are used to identify various speed thresholds and the related equipment. The chart below is intended as a quick reference guide to help readers associate the various networking speeds with their respective protocol/service names. Max Throughput Speed Protocol / Service 64 kbps DSO / Integrated Services Digital Network (ISDN) 1.5 Mbps DS1 / T1 10 Mbps 10Base-T Ethernet

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What is Synchronous Transmission and Asynchronous Transmission?

>> What is Synchronous Transmission? The term synchronous is used to describe a continuous and consistent timed transfer of data blocks. Synchronous data transmission is a data transfer method in which a continuous stream of data signals is accompanied by timing signals (generated by an electronic clock) to ensure that the transmitter and the receiver are in step (synchronized) with one another. The data is sent in blocks (called frames or packets) spaced by fixed time intervals. Synchronous transmission modes are used when large amounts of data must be transferred very quickly from one location to the other. The speed

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What is Power over Ethernet (PoE)?

>> What is Power over Ethernet? 1. Introduction Power-over-Ethernet (PoE) or "Active Ethernet" eliminates the need to run 110/220 VAC power to Wireless Access Points and other devices on a wired LAN. Using Power-over-Ethernet system, installers need to run only a single CAT5 Ethernet cable that carries both power and data to each device. This allows greater flexibility in the locating of AP’s and network devices and significantly decreasing installation costs in many cases. Power over Ethernet (PoE) technology describes a system to pass electrical power safely, along with data, on Ethernet cabling. The IEEE standard for PoE requires category

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