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Avaya Cheap mail order shopping 9620C 1 year warranty IP Telephone 700461205 Year - Warranty Renewed

Avaya 9620C IP Telephone (700461205) - Renewed, 1 Year Warranty

$34

Avaya 9620C IP Telephone (700461205) - Renewed, 1 Year Warranty

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Item specifics

Condition:
Seller refurbished:
The item has been restored to working order by the eBay seller or a third party. This means the item was inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See seller’s listing for full details.
Seller Notes:
“Our Renewed products are fully tested, factory defaulted, and remanufactured to a high quality, factory like new condition. Better yet, we back them with a Rock Solid 1 Year Warranty, superior service, and excellent support.”
Model:
9620C
MPN:
700461205
Lines:
3
Interface(s):
Ethernet (RJ-45)
Brand:
Avaya
Series:
Avaya 9600
Type:
VoIP System
Features:
Conference-Enabled, Handset Intercom, Headset Jack
UPC:
00033587524584






Avaya 9620C IP Telephone (700461205) - Renewed, 1 Year Warranty

5G NR Resource block

Key focus: 5G NR resource block : a block of 14 OFDM symbols (1 slot across time domain) with the corresponding 12 subcarriers for those symbols Radio frame structure Looking at the 5G New Radio (NR) frame structure from the time domain perspective, the radio transmissions are categorized into radio frames, subframes, slots and mini-slots … Read more

π/2 BPSK (pi/2 BPSK): 5G NR PHY modulation

The 5G New Radio (NR) supports quadrature phase shift keying (QPSK), 16- quadrature amplitude modulation (16-QAM), 64 QAM and 256 QAM modulation schemes for both uplink and downlink [1][2]. This is same as in LTE. Additionally, 5G NR supports π/2-BPSK in uplink (to be combined with OFDM with CP or DFT-s OFDM with CP)[1][2]. Utilization … Read more

Array pattern multiplication of phased array antennas

Key focus: Array pattern multiplication: total radiation pattern of N identical antennas is product of single-antenna radiation vector and array factor. Antenna arrays Ferdinand Braun invented the Phased Array Antenna in 1905. He shared a Nobel Prize in physics in recognition of their contributions to the development of wireless telegraphy. An antenna array is a … Read more

Far-field retarded potentials

Key focus: Far-field region is dominated by radiating terms of antenna fields, hence, knowing the far field retarded potentials is of interest. Introduction The fundamental premise of understanding antenna radiation is to understand how a radiation source influences the propagation of travelling electromagnetic waves. Propagation of travelling waves is best described by electric and magnetic … Read more

Near-field – far-field : Where is the boundary ?

Antennas are radiation sources of finite physical dimension. To a distant observer, the radiation waves from the antenna source appears more like a spherical wave and the antenna appears to be a point source regardless of its true shape. The terms far-field and near-field are associated with such observations/antenna measurement. The terms imply that there … Read more

Retarded potentials

Key focus: Understand retarded potentials – the basic building block for understanding antenna array patterns. Retarded potentials are potentials at an observation point when the quantities at the source are non-static (varies in both space and time) The static case : potentials The fundamental premise of understanding antenna radiation is to understand how a radiation … Read more

From Maxwell’s equations to antenna array – part 1

Key focus: Briefly look at the building blocks of antenna array theory starting from the fundamental Maxwell’s equations in electromagnetism. Maxwell’s equations Maxwell’s equations are a collection of equations that describe the behavior of electromagnetic fields. The equations relate the electric fields () and magnetic fields () to their respective sources – charge density () … Read more

Normalized power gain of dipole antennas

Key focus: Briefly look at linear antennas and various dipole antennas and plot the normalized power gain pattern in polar plot and three dimensional plot. Linear antennas Linear antennas are electrically thin antennas whose conductor diameter is very small compared to the wavelength of the radiation λ. Viewed in a spherical coordinate system (Figure 1), … Read more

Bayes’ theorem

Key focus: Bayes’ theorem is a method for revising the prior probability for specific event, taking into account the evidence available about the event. Introduction In statistics, the process of drawing conclusions from data subject to random variations – is called “statistical inference”. Usually, in any random experiment, the observations are recorded and conclusions have … Read more

Line code – demonstration in Matlab and Python

Line code is the signaling scheme used to represent data on a communication line. There are several possible mapping schemes available for this purpose. Lets understand and demonstrate line code and PSD (power spectral density) in Matlab & Python. Line codes – requirements When transmitting binary data over long distances encoding the binary data using … Read more