P841C Central-Side VDSL Modem

FIELD

Table 4-5 VDSL Status Counters

DESCRIPTION

VDSL Parameters: All these fields except for DISC are displayed in hexadecimal format.

LINK STAT

This field displays the link status. The link is up if this field displays 0xac or 0xae; otherwise the link

 

is down.

 

 

DISC

This is a VDSL Disconnect counter.

 

 

Modem Code

This field displays information about the modem code.

 

 

VDSL Line Quality Status

 

 

US

This is the VDSL UpStream rate. The constellations are QAM 4, QAM 8, QAM 16, QAM 64, QAM

 

256 where QAM (Quadrature Amplitude Modulation) defines how many bits there are per symbol;

 

for example QAM 4 means 2 bits per symbol (22), QAM 8, 3 bits (23) per symbol and so on.

 

Int (Interpolation) defines how fast the symbols go through the line. It is equal to 25.0MHz / baud

 

rate, so for example, Int 8 = 25.0 / 8 Mbaud.

 

Rate is the VDSL raw speed and Fc is the carrier frequency.

 

 

DS

This is the VDSL DownStream rate.

 

 

SNR

The higher the SNR (Signal-to-Noise Ratio) number, the better. SNR (Signal-to-Noise Ratio is the

 

ratio of the amplitude of the desired signal to the amplitude of noise signals at a given point in

 

time).

MSE

This is the Minimum Square Error. The minimum mean-square error (also known as MMSE)

 

performance measure is a popular metric for optimal signal processing.

RS_ERR

This is the count of bit errors detected and corrected by Reed-Solomon code. Reed-Solomon

 

codes are block-based error correcting codes and are used to correct errors in many systems.

LT and NT Power Parameters

TXPWR

This field displays transmission power information in hexadecimal format.

 

 

POCO

Port Output Control registers provide the control bit information.

 

 

POWER

This is the power measured in dBm (decibel milliwatts). It is the product of TXPWR and POCO.

 

 

PSD

This is the Power Spectrum Density (power divided by bandwidth).

 

 

4.1.9VDSL Clear Command

vdsl clear

This command clears the VDSL status counters.

4.1.10 VDSL Debug Command

vdsl debug [onoff]

This command turns the VDSL auto flag on or off or just shows the current VDSL auto flag status (without “on” or “off”). When this flag is on, the P841C displays each stage (state) of the VDSL link initialization process. When the VDSL link is up, no messages are displayed until the VDSL line is disconnected.

VDSL-Related Commands

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ZyXEL Communications P841C manual Vdsl Clear Command, Vdsl Debug Command, Vdsl Status Counters, Field

P841C specifications

ZyXEL Communications P841C is an advanced networking device designed with the aim of delivering high-performance and reliable internet connectivity. Positioned primarily for home and small office environments, the P841C stands out with its impressive range of features that cater to diverse networking needs.

The P841C is a DSL modem/router, equipped to handle the demands of modern internet usage, including streaming, gaming, and multiple simultaneous connections. One of its main features is its support for VDSL2 and ADSL2/2+, which ensures high-speed internet access over both fiber and copper lines. This flexibility allows users to take full advantage of their internet service provider's offerings without needing additional equipment.

Another significant characteristic of the ZyXEL P841C is its integrated dual-band wireless capabilities. It operates on both 2.4 GHz and 5 GHz frequency bands, enabling users to connect a wider array of devices without compromising on speed or performance. The dual-band functionality helps reduce network congestion and interference, supporting smoother online activities. This feature is particularly beneficial in environments with numerous connected devices, such as smart TVs, gaming consoles, and smartphones.

The P841C is also equipped with advanced security features, including WPA3 encryption, which ensures that the home network remains secure from unauthorized access. Additionally, it supports the latest IPv6 protocol, ensuring that the device is future-proof and ready for the next generation of internet addressing.

The modem/router also includes built-in Quality of Service (QoS) settings, which allow users to prioritize bandwidth for specific applications or devices. This ensures that critical activities, such as video conferencing or online gaming, receive the necessary bandwidth for optimal performance.

With its sleek, compact design, the ZyXEL P841C fits seamlessly into any home or office setting. Easy installation and user-friendly interface contribute to its appeal, making setup straightforward even for those who may not be tech-savvy. The device comes with multiple Ethernet ports, allowing for wired connections to computers, printers, and other devices.

Overall, the ZyXEL Communications P841C is a robust solution for anyone seeking a reliable and high-speed internet experience. Its blend of advanced technologies, security features, and user-friendly design makes it an ideal choice for both residential and small business applications. Whether for casual browsing or demanding online activities, the P841C is equipped to handle it all with ease.