Hassan wroteHey Guys, hope someone could help me out here.
Considering that I have 16 dB line attenuation (about 1.2 Km away from the Mazraa CO), my theoretical maximum speed is 22 Mbps. Now I realize that this is a theoretical maximum value but the max bandwidth displayed by my modem (ST546 on ADSL2+) is 15 Mbps only despite having a good SN margin of 34.5 dB.
Is my actual maximum bandwidth being limited to 15 Mbps because my target SN Margin is actually set too high? i.e. the balance between speed and stability is tipping too much in favor of stability in my case?
After researching, A LOT, on the matter I got some hypotheses which may be completely irrelevant as I have limited IT expertise:
Perhaps the SN Margin is set too high by Ogero (maybe I'm being put on a stability line profile) or maybe it's a modem problem (it's a ST546 which is bad on its own:p) especially that I do not have it connected to the UPS so it reboots at least once every day and as a result of that, the DLM (Dynamic Line Management) does not get to do its job and reduce my SN Margin progressively as it thinks that my line is unstable due to the reboots?
I would really appreciate it if someone could shed some light on this matter as I am considering whether I will subscribe to the uncapped speed plan or not.
These are my current line stats (after switching my internet back to ADSL2+ as it was automatically switched to ADSL yesterday for some reason):
Modemstate : Up
xDSL Type : ADSL2+
xDSL Standard : ITU-T G.992.5
xDSL Annex : Annex A
Uptime (days hh:mm:ss) : 0 days, 7:31:20
Number of resets : 1
Total Available Bandwidth Cells/s kbit/s
Downstream : 4823 2045
Upstream : 1191 505
Intrinsic/Actual and Maximum Bandwidth % kbit/s
Downstream : 13 15112
Upstream : 38 1321
Bearer Generic Info Downstream Upstream
INP (DMT) : 8.19 3.76
Delay (ms) : 7.94 15.05
R : 16 16
Margin (dB) : 34.5 31.5
Attenuation (dB) : 16.0 6.5
OutputPower (dBm) : 17.0 11.5
Vendor Chipset Local Remote
Country : B5 B5
Vendor : BDCM BDCM
VendorSpecific : 0000 0862
StandardRevisionNr : 00 02
Vendor System
Country : 0F 00
Vendor : TMMB ----
VendorSpecific : 3C61 0000
StandardRevisionNr : 00 00
Transfer statistics
Errors
Received FEC : 13
Received CRC : 0
Received HEC : 0
Transmitted FEC : 29647411
Transmitted CRC : 165086
Transmitted HEC : 411007
Near end failures since reset
Loss of frame : 0 failures
Loss of signal : 0 failures
Loss of power : 0 failures
Errored seconds : 10 seconds
Near end failures last 15 minutes
Loss of frame : 0 seconds
Loss of signal : 0 seconds
Loss of power : 0 seconds
Errored seconds : 0 seconds
Near end failures current day
Errored seconds : 10 seconds
Near end failures previous day
Errored seconds : 0 seconds
When you reboot the modem, do the FEC ,CRC and HEC errors reset? or those are accumulated values? because if those are errors during your 7 hours up-time, they are too much.
Basically, i live 1 km far from Mazraa CO, and my current max speed now is 12 Mbps with SN Margin (Up/Down) [dB]: 24,8 / 17,7. so max i can go is 15-17 Mbps without my SN margin deteriorating too much
Edit: i had FEC errors yesterday (Mazraa CO) but not that high FEC Errors (Up/Down): 23 / 69.848 (10 hours run-time)