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Standard User JamesK
(regular) Fri 07-Feb-14 12:57:36
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Still worth matching OR modem to DSLAM hardware


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Hi All,

After sorting out some issues with my internal phone wiring last year the best connection I'd managed to get out of my HG612 modem was the following, with an INP level of 3:

Max: Upstream rate = 8775 Kbps, Downstream rate = 41488 Kbps
Path: 0, Upstream rate = 8827 Kbps, Downstream rate = 35526 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.1 6.0
Attn(dB): 0.0 0.0
Pwr(dBm): 11.0 5.2
VDSL2 framing
Path 0
B: 63 238
M: 1 1
T: 64 59
R: 16 16
S: 0.0573 0.8611
L: 11167 2369
D: 563 1
I: 80 255
N: 80 255

This resulted in download tests from speedtest.net of about 32/33mbps.

I'd read that matching the Openreach modem with the hardware in DSLAM could be beneficial to speed and reduce/eliminate interleaving. So I brought an ECI /R modem. I saw an immediate increase in speed. The speedtest.net results jumped to a regular 36mbps. I still think the line is slightly interleaved as a traceroute to the first hop beyond my router is 12/13ms. I've not hacked the modem so can't get to any of the detailed stats.

A few weeks after doing this I think the ECI modem received a firmware update as it rebooted during the night around the same time as HG612 users were noticing they'd had a firmware upgrade as well. However, apart from the ECI modem has been rock solid and there's been no re-sync's of the line forced by DLM.

I was wondering if it was still beneficial to match the OR modem to the DSLAM since the firmware upgrades, and if the HG612 now performed as well as the ECI modem when connected to the ECI DSLAM.

I do miss not having access to the statistics, and am tempted to re-connect the HG612, but also don't want to mess around too much with the line in case DLM decides to kick in again.
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