The Fiber Advantage

January 2nd, 2008

Fiber-optic communication is a method of transmitting information from one place to another by sending light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information. First developed in the 1970s, fiber-optic communication systems have revolutionized the telecommunications industry and played a major role in the advent of the Information Age. Because of its advantages over electrical transmission, the use of optical fiber has largely replaced copper wire communications in core networks in the developed world.The process of communicating using fiber-optics involves the following basic steps: Creating the optical signal using a transmitter, relaying the signal along the fiber, ensuring that the signal does not become too distorted or weak, and receiving the optical signal and converting it into an electrical signal. Fiber LinesOptical fiber consists of a core, cladding, and a protective outer coating, which guides light along the core by total internal reflection. The core, and the lower-refractive-index cladding, are typically made of high-quality silica glass, though they can both be made of plastic as well. An optical fiber can break if bent too sharply. Due to the microscopic precision required to align the fiber cores, connecting two optical fibers, whether done by fusion splicing or mechanical splicing, requires special skills and interconnection technology.[1].Two main categories of optical fiber used in fiber optic communications are multi-mode optical fiber and single-mode optical fiber. Multimode fiber has a larger core (≥ 50 micrometres), allowing less precise, cheaper transmitters and receivers to connect to it as well as cheaper connectors. However, multi-mode fiber introduces multimode distortion which often limits the bandwidth and length of the link. Furthermore, because of its higher dopant content, multimode fiber is usually more expensive and exhibits higher attenuation. Single-mode fiber’s smaller core (<10 micrometres) necessitates more expensive components and interconnection methods, but allows much longer, higher-performance links.

In order to package fiber into a commercially-viable product, it is protectively-coated, typically by using ultraviolet (UV) light-cured acrylate polymers, terminated with optical fiber connectors, and assembled into a cable. It can then be laid in the ground, run through a building or deployed aerially in a manner similar to copper cable. Once deployed, such cables require substantially less maintenance than copper cable.

Comparison with electrical transmissionThe choice between optical fiber and electrical (or copper) transmission for a particular system is made based on a number of trade-offs. Optical fiber is generally chosen for systems requiring higher bandwidth or spanning longer distances than electrical cabling can accommodate. The main benefits of fiber are its exceptionally low loss, allowing long distances between amplifiers or repeaters, and its inherently high data-carrying capacity, such that thousands of electrical links would be required to replace a single high bandwidth fiber. Another benefit of fiber is that even when run alongside each other for long distances, fiber cables experience effectively no crosstalk, in contrast to some types of electrical transmission lines.In short distance and relatively low bandwidth applications, electrical transmission is often preferred because of its lower material cost, where large quantities are not required, lower cost of transmitters and receivers, ease of splicing, capability to carry electrical power as well as signals, and ease of operating transducers in linear mode. Because of these benefits of electrical transmission, optical communication is not common in short box-to-box, backplane, or chip-to-chip applications; however, optical systems on those scales have been demonstrated in the laboratory.In certain situations fiber may be used even for short distance or low bandwidth applications, due to other important features such as immunity to electromagnetic interference, including nuclear electromagnetic pulses (although fiber can be damaged by alpha and beta radiation), high electrical resistance, making it safe to use near high-voltage equipment or between areas with different earth potentials, lighter weight, important, for example, in aircraft, no sparks, important in flammable or explosive gas environments, not electromagnetically radiating, and difficult to tap without disrupting the signal, important in high-security environments, and much smaller cable size — important where pathway is limited, such as networking an existing building, where smaller channels can be drilled.

 

The Technology of Digital Fiber T1 Service

January 2nd, 2008

  A DS1 circuit is made up of twenty-four 8-bit channels (also known as timeslots or DS0’s), each channel being a 64 kbit/s DS0 multiplexed pseudo-circuit. A DS1 is also a full-duplex circuit, meaning, in theory, the circuit can send 1.544 Mbit/s and receive 1.544 Mbit/s concurrently. A total of 1.536 Mbit/s of [1] bandwidth is achieved by sampling each of the twenty-four 8-bit DS0’s 8000 times per second. This sampling is referred to as 8-kHz sampling . Digital signal 1 (DS1, also known as T1, sometimes “DS-1″) is a T-carrier signaling scheme devised by Bell Labs.[1] DS1 is a widely used standard intelecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside of North America and Japan. Technically, DS1 is the transmission protocol used over a physical T1 line; however, the terms “DS1″ and “T1″ are often used interchangeably. Also, the 24 channels of traffic in a T1 line are sometimes called a T-span. 

 Digital signal 1 (DS1, also known as T1, sometimes “DS-1″) is a T-carrier signaling scheme devised by Bell Labs.[1] DS1 is a widely used standard intelecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside of North America and Japan. Technically, DS1 is the transmission protocol used over a physical T1 line; however, the terms “DS1″ and “T1″ are often used interchangeably. Also, the 24 channels of traffic in a T1 line are sometimes called a T-span. 

Predictive Dialers

January 2nd, 2008

The predictive dialer exhibits predictive behavior when its dialing algorithm produces more call attempts (dials) than the number of agents currently logged in and available to handle calls. The predictive dialing happens when the predictive dialer dials ahead of the agents becoming available or when the predictive dialer matches a forecast number of available agents with a forecast number of available called parties. The matching and dialing ahead perspectives provide the large increases in dial rates and agent productivity.If a system has 100 agents working on it, the dialer will dial a number of calls sometimes crudely based on a phone line to agent ratio of 1.5:1 or 2:1. This means that for each available agent, the system will dial the phone numbers of two potential customers. As these calls are made to the telephone network the dialer will monitor each call and determine what the outcome of the call was. From 150 calls made, the system will immediately strip out any unproductive outcomes, such as busy calls (these are usually queued for automatic redial), no answers & invalid numbers. Some predictive dialers incorporate “answering machine detection”, which tries to determine if a live person or answering machine picked up the phone. This is one cause of the typical delays that one may experience before being connected to an agent.If not enough calls are made ahead, agents will sit idle, whereas if there are too many calls made and there are not enough agents to handle them, then the call is typically dropped. A sophisticated system will throttle calls more appropriately to deal with these situations.The advanced predictive dialer determines and uses many operating characteristics that it learns during the calling campaign and adjusts automatically to the behaviour of an ongoing campaign. Examples of such statistics include call connection rates (both current and average for recent past days by hour of the day), average agent connection time, geographic location dialed, etc. It uses these statistics continually to make sophisticated predictions so as to minimize agent idle time while controlling occurrences of nuisance calls, which are answered calls without the immediate benefit of available agents. An advanced predictive dialer can readily maintain the ratio of nuisance calls to answered calls at less than a fraction of one percent while still dialing ahead. However, this level of performance may require a sufficiently large critical mass of agents. Conversely, it becomes increasingly difficult to maintain a high talk time percentage with a lower number of agents without increasing dropped calls.

Wholesale Long Distance

January 2nd, 2008

A new program called “Truly Wholesale Long Distance” was announced today by President, John Hoffman.

“We believe this is the first wholesale long distance discounted all fiber T1 rate program in the US,” said President Hoffman.

VIP Communications, the fastest growing wholesaler of total fiber long distance service, has developed the Truly Wholesale product for Call Centers, Dialer Customers, High Volume User, and Educated T1 Buyers.

This product features 6-second billing increments with 1-second rounding, representing a 12-15% additional cost savings over the already low 0.011 cents per minute interstate rate. This brings the effective rate below 1-cent per minute for all fiber tier one product.

“We also have very competitive intrastate rates with 6/1 billing,” Hoffman commented.

Interested parties can see their savings on a quote from The Company. Eastern customers can call 866-847-2667(email vipemail@viptelecom.com).  In the West, call the Western Regional Office at 602-290-6513(email joncomo@msn.com).

December 21st, 2007

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