User manual LG LAM400R

[. . . ] 4-Port ADSL Router Model: LAM400R U S ER MA N U A L For Annex A/B LAM400R Copyright Copyright © 2002 by this company. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of this company. Disclaimer This company makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties, merchantability or fitness for any particular purpose. Any software described in this manual is sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not this company, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential damages resulting from any defect in the software. [. . . ] The SNR Margin is the amount of increased noise that can be tolerated while maintaining the designated BER ( Bit Error Rate ). The SNR Margin is set by Central Office DSLAM. If the SNR Margin is increased, bit error rate performance will improve, but the data rate will decrease. Conversely, if the SNR Margin is decreased, bit error rate performance will decrease, but the data rate will increase. Line Attenuation : Attenuation is the decrease in magnitude of the 4 Port ADSL Router line signal between the transmitter ( Central Office DSLAM ) and the receiver ( Client 4 Port ADSL Router ), measured in dB. It is measured by calculating the difference in dB between the signal power level received at the Client 4 Port ADSL Router and the reference signal power level transmitted from the Central Office DSLAM. Errored Seconds : During Showtime, if any given second contains a CRC error, then that second will be declared and recorded as an Errored Second. Loss of Signal : Loss of signal refers to the 4 Port ADSL Router losing an ADSL signal, not the computer losing a signal with the modem. Loss of Signal event is only recorded if the signal is lost while the 4 Port ADSL Router is in showtime status. This field displays the count of 4 Port ADSL Router signal loss events. Loss of Frame : A frame is a unit of data in ATM. This field displays the count of 4 Port ADSL Router frame loss events. A Loss of Frame event is only recorded if the signal is lost while the 4 Port ADSL Router is in showtime status. CRC Errors : Cyclic Redundancy Check ( CRC ) is a method for checking errors in data transmissions. This field displays the number of transmit data frames containing CRC errors. Data Rate : This field displays the 4 Port ADSL Router data rate in kbps. Latency : Latency, synonymously delay, is the amount of time it takes for a packet of data to get from one designated point to another. This field displays the two mapping modes for latency ( Fast and Interleaved ). LG4- Port ADSL Router User Manual 89 LAM400R 4. 4. 2. 4 WAN Status The WAN Status page shows the information and status of WAN PVCs. WAN : This field displays the IP address, Subnet Mask and MAC address for the WAN (ADSL) interface. Use the Virtual Circuit selection to select different PVCs for status display. Virtual Circuit : Select the Virtual Circuit that you want to release/renew, select the appropriate option on the menu dropdown and click "EXECUTE". LG4- Port ADSL Router User Manual 90 LAM400R 4. 4. 2. 5 ATM Status The ATM Status page shows all the statistics information of ATM cells. This page contains information that is dynamic and will refresh every 2 seconds. Reset Counters : This button allows user to reset the ATM Status counter. ATM Status Fields : Tx Bytes, Rx Bytes, Tx Cells, Rx Cells, Rx HEC Errors, Tx Mgmt Cells, Tx CLP0 Cells, Rx CLP0 Cells, Tx CLP1 Cells, Rx CLP1 Cells, Rx Errors, Tx Errors, and Rx Misrouted Cells. [. . . ] Subnet Mask : Short for SUBNETwork Mask, subnet mask is a technique used by the IP protocol to filter messages into a particular network segment, called a subnet. The subnet mask consists of a binary pattern that is stored in the client computer, server, or router. This pattern is compared with the incoming IP address to determine whether to accept or reject the packet. TCP : Transfer Control Protocol: Works together with Internet Protocol for sending data between computers over the Internet. [. . . ]