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	here's a little info about what some adsl broadband terms mean in relation to errors and line conditions : The "near end" is your downstream channel, so the readings obtained from 'wan adsl linedata near' are about your downstream line quality. The "far end" is your upstream channel, so the readings obtained from 'wan adsl linedata far' are about your upstream line quality. Attenuation is a measurement of signal loss in dB. Basically, how much of the original signal level as reported by one end have we lost by the time it gets to the other end. The folks in the NOC centers swear by attenuation as the "golden measurement" to judge a line by, but in 4 years as a field tech I just couldn't corroborate that. Many of them believe that at 63dB of attenuation, data can't move over the link at all (haha), so it was VERY common for them to blame speed problems or even no ability to pass data at all on "high attenuation" when the problem really was something else altogether (bad port, bad provisioning, etc.). Basically they're blaming a problem with passing data on the cable pair when the customer can hold sync. I found this to be a source of both intense humor and extreme frustration when trying to work trouble tickets. Anyway, you want low numbers here, and 63dB is the maximum, representing the highest level of signal loss. CRC = Cyclic Redundancy Check this is a code which is added to your data to enable error detection & correction. (we have found some of these errors ocur because of (mains cables) near telephone lines or router/ modem and also lower costing / spec modems routers ) this is when outr adsl tester will prove is it an equipment or line fault . FEC = Forward error control HEC = Header error check LOF = LOSS OF FRAME LOM = LOSS OF MARGIN LOP = LOSS OF POWER LOS = LOS OF SIGNAL Noise Margin is in indication of how much headroom exists on the channel for line noise without causing a loss of link if exceeded., The upstream and downstream noise margin values to be the most practical indicators of line quality. Note that there is an inverse relationship between Noise Margin and channel sync rate, given the same loop/line/location. Ie, the higher the sync rate you push on the line, the lower the noise margin you can expect to have on the same line. 6dB is the minimum requirement on either channel, but the higher your numbers are, the better. Relative Capacity Occupation is a percentage value, reflecting on a scale of 0 to 100 percent, how much of the capacity of your line are you "pushing" in order to be in sync at speed you're in sync at for this (upstream or downstream) channel. Obviously, low numbers are desirable here.
			Access Node: Performs adaptation between the core network and the access network ADSL: Asymmetric Digital Subscriber Line ANSI: American National Standard Institution AS0-3: Downstream simplex sub-channel designators ATM: Asynchronous Transfer Mode ATU-C: ADSL Transceiver Unit, central office end ATU-R: ADSL Transceiver Unit,remote terminal end BER: Bit Error Ratio B-ISDN: Broadband ISDN (Broadband Integrated Services Digital Network) DAVIC: Digital Audio-Visual Council ETSI: European Telecommunications Standards Institute FTTC: Fiber to the Curb FTTH: Fiber to the Home HAN: Home ATM Network HEC: ATM cell Header Error Control HFC: Hybrid Fiber Coaxial ISDN: Integrated Services Digital Network ITU-T: International Telecommunications Union -Telecommunications LCD: Loss of Cell Delineation LS0-3: Duplex sub-channel designators NT: Network Termination B-NT1: B-ISDN Network Termination Type 1 OAM: Operation, Administration and Maintenance PDN: Premises Distribution Network. System for connecting the B-NT1 to the Service Modules


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