Interesting Findings - SSFP MK4 vs Test Socket

Hi guys,

I've noticed that if my modem is connected to the test socket on my master socket 5c, the amount of FECs/retransmissions drop considerably (over 90% in some cases), compared to when it's connected to the SSFP.

I've also noticed that the SNRM is more stable, the QLN graph is less noisy and the Hlog is more complete. I don't know if the MK4 is faulty, but it seems that it produces noise rather than removes it! There doesn't seem to be any significant difference in the sync speed between the test socket or the SSFP, either.

Obviously, having the modem connected to the test socket isn't ideal, but it's obviously in a better place than before!

Has anyone else noticed this behaviour?

Edited by deleted (Wed 18-Jul-18 15:07:17)

Presumably there are no extensions connected to the faceplate? If not then it does sound like maybe the electronics on the faceplate are on their way out.

Nope, none whatsoever. I checked all of the extension sockets in our house and they're all dead (no dial tone).

Could well be a dodgy faceplate then.

Yeah, well it does rattle when I shake it. LOL.

Here are some comparison of line stats:

MK4 SSFP:

adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 6853 Kbps, Downstream rate = 54180 Kbps
Bearer: 0, Upstream rate = 7517 Kbps, Downstream rate = 51893 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 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): 3.7 5.6
Attn(dB): 26.8 0.0
Pwr(dBm): 12.1 6.5

VDSL2 framing
Bearer 0
MSGc: -6 26
B: 227 223
M: 1 1
T: 0 42
R: 10 0
S: 0.1397 0.9466
L: 13625 1893
D: 4 1
I: 238 112
N: 238 224
Q: 4 0
V: 0 0
RxQueue: 125 0
TxQueue: 25 0
G.INP Framing: 18 0
G.INP lookback: 25 0
RRC bits: 0 24
Bearer 1
MSGc: 122 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 8.0000 0.0000
L: 32 0
D: 1 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0

Counters
Bearer 0
OHF: 0 671297
OHFErr: 4 9
RS: 190121832 28185059
RSCorr: 2214698 0
RSUnCorr: 0 0
Bearer 1
OHF: 415190 0
OHFErr: 0 0
RS: 3321027 0
RSCorr: 644 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 1206290 0
rtx_c: 1142892 0
rtx_uc: 13 0

G.INP Counters
LEFTRS: 603 0
minEFTR: 50919 0
errFreeBits: 5143405 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 648634319 0
Data Cells: 5955687 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 3 9
SES: 0 0
UAS: 198 198
AS: 6671

Bearer 0
INP: 55.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 9.97
OR: 0.01 25.65
AgR: 52006.93 7542.53

Bearer 1
INP: 2.00 0.00
INPRein: 2.00 0.00
delay: 0 0
PER: 16.06 0.01
OR: 63.75 0.01
AgR: 63.75 0.01

Bitswap: 1131/1475 39/40

Total time = 1 hours 54 min 29 sec
FEC: 2214698 0
CRC: 4 9
ES: 3 9
SES: 0 0
UAS: 198 198
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Latest 15 minutes time = 9 min 29 sec
FEC: 215621 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Previous 15 minutes time = 15 min 0 sec
FEC: 368732 0
CRC: 4 1
ES: 3 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: N/A
FailedRetr: N/A
FailedFastRetr: N/A
Latest 1 day time = 1 hours 54 min 29 sec
FEC: 2214698 0
CRC: 4 9
ES: 3 9
SES: 0 0
UAS: 198 198
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Since Link time = 1 hours 51 min 11 sec
FEC: 2214698 0
CRC: 4 9
ES: 3 9
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
>

Test Socket:

adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 6979 Kbps, Downstream rate = 52271 Kbps
Bearer: 0, Upstream rate = 7464 Kbps, Downstream rate = 50655 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 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): 3.6 5.9
Attn(dB): 26.8 0.0
Pwr(dBm): 12.1 6.5

VDSL2 framing
Bearer 0
MSGc: -6 26
B: 227 223
M: 1 1
T: 0 41
R: 10 0
S: 0.1432 0.9532
L: 13300 1880
D: 4 1
I: 238 112
N: 238 224
Q: 4 0
V: 0 0
RxQueue: 120 0
TxQueue: 24 0
G.INP Framing: 18 0
G.INP lookback: 24 0
RRC bits: 0 24
Bearer 1
MSGc: 122 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 8.0000 0.0000
L: 32 0
D: 1 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0

Counters
Bearer 0
OHF: 0 357543
OHFErr: 0 14
RS: 97190936 14656745
RSCorr: 160155 0
RSUnCorr: 0 0
Bearer 1
OHF: 217463 0
OHFErr: 0 0
RS: 1739206 0
RSCorr: 356 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 9176 0
rtx_c: 9175 0
rtx_uc: 0 0

G.INP Counters
LEFTRS: 0 0
minEFTR: 50636 0
errFreeBits: 2696796 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 340137095 0
Data Cells: 14241016 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 0 13
SES: 0 0
UAS: 122 122
AS: 3494

Bearer 0
INP: 54.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 9.80
OR: 0.01 26.10
AgR: 50766.39 7490.73

Bearer 1
INP: 2.00 0.00
INPRein: 2.00 0.00
delay: 0 0
PER: 16.06 0.01
OR: 63.75 0.01
AgR: 63.75 0.01

Bitswap: 644/718 10/10

Total time = 1 hours 16 sec
FEC: 160155 0
CRC: 0 14
ES: 0 13
SES: 0 0
UAS: 122 122
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Latest 15 minutes time = 16 sec
FEC: 194 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Previous 15 minutes time = 15 min 0 sec
FEC: 3778 0
CRC: 0 3
ES: 0 3
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: N/A
FailedRetr: N/A
FailedFastRetr: N/A
Latest 1 day time = 1 hours 16 sec
FEC: 160155 0
CRC: 0 14
ES: 0 13
SES: 0 0
UAS: 122 122
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Previous 1 day time = 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
Since Link time = 58 min 13 sec
FEC: 160155 0
CRC: 0 14
ES: 0 13
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
FailedRetr: 0
FailedFastRetr: 0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
>

Edited by deleted (Wed 18-Jul-18 15:29:59)

In reply to a post by WilliamGrimsley:

Nope, none whatsoever. I checked all of the extension sockets in our house and they're all dead (no dial tone).

Just to be clear: there's no dial tone even when the faceplate is in? Because removing the faceplate will disconnect the extension wiring (at least in a modern box).

Also, even any partial or incomplete extension wiring might have an effect, so better to make sure it's entirely disconnected from the master socket by checking nothing is connected to the extension wiring terminals.

Yes, correct. There are no extension sockets connected, the work was done years ago.

Have you checked the work was done correctly?

Sure was, we've had several engineers visit the property and they would've spotted if we still had extension wiring connected!

Edited by deleted (Thu 19-Jul-18 08:23:58)

Should I leave the modem connected to the test socket or risk buying another MK4 SSFP?