Table of Contents
- 1 What does frequency split mean?
- 2 What is the upstream frequency range of high split architecture?
- 3 What is the minimum frequency separation between two stations?
- 4 What is Diplex filter?
- 5 What should the SNR be on a cable modem?
- 6 How are frequencies separated?
- 7 How is Vodafone and TPG going to split?
- 8 What are the different types of channel banks?
What does frequency split mean?
[′frē·kwən·sē ‚splid·iŋ] (electronics) One condition of operation of a magnetron which causes rapid alternating from one mode of operation to another; this results in a similar rapid change in oscillatory frequency and consequent loss in power at the desired frequency.
What is a mid split?
Mid Split. A frequency division scheme that allows bi-directional traffic on a single coaxial cable. Reverse channel signals propagate to the headend from 5 to 108 MHz. Forward path signals go from the headend from 162 MHz to the upper frequency limit. The duplex crossover band is located from 108 to 162 MHz.
What is the upstream frequency range of high split architecture?
The DOCSIS 3.0 specifications support an upper frequency edge for the upstream band of up to 85 MHz, also known as mid-split. While the newer DOCSIS 3.1 specification supports an upper frequency edge of up to 204 MHz, also known as high-split.
What is the docsis return path frequency range for a sub split system?
Also called return or reverse. In most North American cable networks, the legacy upstream spectrum occupies frequencies from 5 MHz to as high as 42 MHz. 2) The DOCSIS 3.1 upstream is 5-204 MHz, with support for 5-42 MHz, 5-65 MHz, 5-85 MHz and 5-117 MHz.
What is the minimum frequency separation between two stations?
The minimum frequency separation between two different signals multiplexed is known as the “channel spacing.” Since the wavelength of operation is inversely proportional to the frequency, a corresponding difference is introduced in the wavelength of each signal.
How does frequency separation work?
Frequency separation allows you to work independently on the two layers you created. When you want to change details in the skin’s texture like wrinkles, or pores, retouch on the “Texture” layer. When you want to remove redness or lighten shadows, retouch on the “Shadows & Color” layer.
What is Diplex filter?
The diplex filter, or diplexer, is a matched set of low-pass and high-pass filters, which separate signals by direction (possible due to their difference in frequency).
What is upstream and downstream networking?
Upstream traffic refers to data that is sent from a computer or network. Downstream traffic refers data that is received by a computer or network. This includes receiving e-mail messages, downloading files, or simply visiting Web pages. Online games also generate downstream traffic.
What should the SNR be on a cable modem?
Ideal levels are approximately 40 to 50 dBmV for single channels, 37 to 48 dBmV each for 2 to 4 channels. The Signal to Noise Ratios should also all be within three dB of each other. However, for power level -15 to -6 dBmV the SNR should be 33 dB or higher and for -6 to +15 dBmV the SNR should be 30 dB or higher.
What frequency is cable TV?
Immediately above the frequency of channel 13, cable TV channels occupy a continuous frequency band from 210 up to 552 MHz for channel numbers of 23 to 78. Cable TV channels 14 to 22 occupy a frequency band from 120 to 174 MHz merging to the frequency band of conventional TV channel 7.
How are frequencies separated?
Frequency separation is a tried-and-true Photoshop process used by portrait photographers. The process puts high and low-frequency information onto different layers. High-frequency information is about the fine details. These include hair, texture, pores, fine lines, and skin imperfections.
What is the transmitter spacing D?
Clearance calculation Fresnel zone: D is the distance between the transmitter and the receiver; r is the radius of the first Fresnel zone (n=1) at point P. P is d1 away from the transmitter, and d2 away from the receiver.
How is Vodafone and TPG going to split?
In its scheme booklet, TPG also revealed plans to split the company in two, hiving off the smaller Singaporean business and listing it as a separate entity on the Australian Securities Exchange. The much larger Australian business will then merge with Vodafone to form Australia’s third-biggest telecoms firm.
What are the sub-sectors of the telecommunications sector?
The telecommunications sector consists of three basic sub-sectors: telecom equipment (the largest), telecom services (next largest) and wireless communication. Telecom is growing less about voice and increasingly about video, text, and data.
What are the different types of channel banks?
There are five kinds of Channel Banks that are used in the System: D1, D2, D3, D4, and DCT (Digital Carrier Trunk). A transmitting portion of a Channel Bank digitally encodes the 24 analog channels, adds signalling information into each channel, and multiplexes the digital stream onto the transmission medium.