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[Alex Atkin UK]

I have been having some major speed issues of late, line dropping once a week and I am wondering if high OHF is an indication of a line problem?

The thing is, I am on an Origin Broadband connection which seems to not be subject to BT DLM so if my line quality has deteriorated its likely to manifest like this.  But how many errors are too many?  I also find it odd that it wouldn't manifest with a lower SNR.

My line stats are showing as:

Code: [Select]

Discovery Phase (Initial) Band Plan
US: (6,31) (882,1193) (1984,2770)
DS: (33,857) (1218,1959) (2795,4083)
Medley Phase (Final) Band Plan
US: (6,31) (882,1193) (1984,2770)
DS: (41,857) (1218,1959) (2795,4083)
  VDSL Port Details   Upstream   Downstream
Attainable Net Data Rate:     32538 kbps     95092 kbps
Actual Aggregate Tx Power:        6.6 dBm      13.7 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
  Line Attenuation(dB): 3.7 16.9 25.6   N/A   N/A 8.3 21.0 33.2
Signal Attenuation(dB): 3.5 16.7 25.5   N/A   N/A 10.5 20.8 33.1
SNR Margin(dB): 13.5 11.2 16.3   N/A   N/A 10.3 10.3 10.3
TX Power(dBm): -4.9 -26.0 6.3   N/A   N/A 11.0 7.4 7.4

Code: [Select]

xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Last initialization procedure status: 0
Max: Upstream rate = 32626 Kbps, Downstream rate = 95088 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79987 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode(0x0)
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 10.3 14.9
Attn(dB): 13.5 0.0
Pwr(dBm): 13.7 6.6
VDSL2 framing
Bearer 0
MSGc: 18 150
B: 239 236
M: 1 1
T: 23 5
R: 0 16
S: 0.0955 0.3771
L: 20104 5410
D: 1 1
I: 240 255
N: 240 255
Counters
Bearer 0
OHF: 287683066 984995
OHFErr: 2218 247
RS: 0 172530
RSCorr: 0 2531
RSUnCorr: 0 0

Bearer 0
HEC: 4198 0
OCD: 95 0
LCD: 95 0
Total Cells: 139374287 0
Data Cells: 1476867977 0
Drop Cells: 0
Bit Errors: 0 0

ES: 7225 2512
SES: 40 38
UAS: 232 1245
AS: 475797

Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 1.65 6.15
OR: 116.09 202.87
AgR: 80103.09 20203.27

Bitswap: 379806/379808 156/158

[roseway]

I don't think we're really sure what OHF is, but it's suggested that it refers to frame overheads (checksum bytes) which are used for error correction in a similar way to FEC. It seems very likely that the number which matters is OHFErr, the number of frames out of that large total which required retransmission because of errors.

[Alex Atkin UK]

Indeed I'm still not convinced its a line problem, I think Origin have some issue with the backhaul from my exchange, but I thought I should at least check what the more knowledgeable people on here thought as my speed seems to be worse day by day and now I am having it lose sync more often.