Welcome to the
kitz forum.
Down Up
SNR (dB): 10.3 6.1
Attn(dB): 25.7 0.0
Pwr(dBm): 13.5 3.4
Attn Up = 0.0 ?
Don't worry about that. There is nothing wrong. It's essentially a "cosmetic blemish".
There are times when the transceiver units, at each end of the link, fail to exchange all of the parameters. In this particular case, the modem's transceiver unit has sent a signal (at a known power level) to the transceiver unit of the DSLAM's line-card port for your circuit. By measuring the power received, the DSLAM can determine the attenuation for the US direction. However, for whatever reason, the DSLAM has failed to notify the modem of the attenuation it has determined. Hence the modem shows 0.0 dB.
Reading into SNR, it seems that this is set by the exchange hardware to make sure the line stays stable (but results in slower speed).
No, not "exchange hardware" but by the dynamic line management process of the cabinet based DSLAM.
I read that some modems can tweak this value, but not the HG612?!?
No. The DSLAM will reject any attempted tweaks. Attempts to do so will also violate the terms of
SIN 498, Section 2.2.1, Dynamic Line Management.
Could this potentially be a result from using CAT6 instead of CW1308? Though it's not a long wire. Is there another way of reducing this value? Should I get in contact with my provider in case they can lower it?
No, no and, er, no.
I've taken a look at the plots contained in the Graphs.zip archive you attached to your opening post. Unfortunately you have over-sized those which have the bandwidth as the x-axis. For a VDSL2 (ITU-T G.993.2) Profile 17a service there are a maximum of 4096 sub-carriers (numbered 0 to 4095). With the x-axis scale set to nearly double that required for the 17MHz bandwidth, the plots are rather compressed and not that easy to interpret.
However all is not lost . . . for you also attached the TelnetData.zip archive. I was able to massage that data into a suitable format and produced the four usual snapshot plots which give an overview of the circuit. Attached, below, is a montage of the four snapshot plots.
Looking at the Bit Loading, the SNR and the Hlog plots I see nothing particularly abnormal. They tell me a mid-length line, with a small amount of downstream power back-off in the DS1 band and with no obvious problems in the metallic pathway. The is no evidence of any significant degree of cross-talk.
The QLN plot is unpleasant.
There are no abnormally powerful discrete signals present, just a systematic rise in overall noise as the frequency decreases. Does the line run near any mains wiring? Or close to any other mains powered equipment?