Here are my stats:

From Extension (Router)

/usr/sbin/adslctl: ADSL driver and PHY status
Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 8096 Kbps
Link Power State: L0
Mode: G.DMT
Channel: Interleave
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.2 14.0
Attn(dB): 39.0 22.0
Pwr(dBm): 19.8 9.5
Max(Kbps): 9152 1184
Rate (Kbps): 8096 768
G.dmt framing
K: 254(0) 25
R: 12 16
S: 1 8
D: 64 8
ADSL2 framing
MSGc: 1 1
B: 254 25
M: 1 8
T: 1 1
R: 12 16
S: 1.0470 8.6153
L: 2040 208
D: 64 8
Counters
SF: 1113801 1113799
SFErr: 555 0
RS: 151477000 9467291
RSCorr: 39172 106
RSUnCorr: 17628 0

HEC: 503 0
OCD: 0 0
LCD: 0 0
Total Cells: 361534554 0
Data Cells: 21280903 0
Drop Cells: 0
Bit Errors: 0 0

ES: 201 0
SES: 5 0
UAS: 22 0
Total time = 5 hours 16 min 10 sec
SF = 1113801
CRC = 555
LOS = 0
LOF = 0
ES = 201
Latest 1 day time = 5 hours 16 min 10 sec
SF = 1113801
CRC = 555
LOS = 0
LOF = 0
ES = 201
Latest 15 minutes time = 1 min 10 sec
SF = 4071
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 53041
CRC = 7
LOS = 0
LOF = 0
ES = 6
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 52864
CRC = 112
LOS = 0
LOF = 0
ES = 11
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 52923
CRC = 57
LOS = 0
LOF = 0
ES = 27
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 52982
CRC = 63
LOS = 0
LOF = 0
ES = 33

From Main Socket (XTE-2005)

/usr/sbin/adslctl: ADSL driver and PHY status
Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 8096 Kbps
Link Power State: L0
Mode: G.DMT
Channel: Interleave
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.5 14.0
Attn(dB): 39.0 22.0
Pwr(dBm): 19.8 9.4
Max(Kbps): 8864 1184
Rate (Kbps): 8096 768
G.dmt framing
K: 254(0) 25
R: 12 16
S: 1 8
D: 64 8
ADSL2 framing
MSGc: 1 1
B: 254 25
M: 1 8
T: 1 1
R: 12 16
S: 1.0470 8.6153
L: 2040 208
D: 64 8
Counters
SF: 78233 78231
SFErr: 50 0
RS: 10639752 664963
RSCorr: 3133 0
RSUnCorr: 2230 0

HEC: 47 0
OCD: 0 0
LCD: 0 0
Total Cells: 25393971 0
Data Cells: 860905 0
Drop Cells: 0
Bit Errors: 0 0

ES: 9 0
SES: 1 0
UAS: 38 0
Total time = 23 min 5 sec
SF = 78233
CRC = 50
LOS = 0
LOF = 0
ES = 9
Latest 1 day time = 23 min 5 sec
SF = 78233
CRC = 50
LOS = 0
LOF = 0
ES = 9
Latest 15 minutes time = 8 min 5 sec
SF = 28556
CRC = 8
LOS = 0
LOF = 0
ES = 1
Previous 15 minutes time = 15 min 0 sec
SF = 49677
CRC = 42
LOS = 0
LOF = 0
ES = 8
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0

From Test Socket

/usr/sbin/adslctl: ADSL driver and PHY status
Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 8096 Kbps
Link Power State: L0
Mode: G.DMT
Channel: Interleave
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 7.3 10.0
Attn(dB): 39.0 22.0
Pwr(dBm): 19.8 12.1
Max(Kbps): 8736 992
Rate (Kbps): 8096 768
G.dmt framing
K: 254(0) 25
R: 12 16
S: 1 8
D: 64 8
ADSL2 framing
MSGc: 1 1
B: 254 25
M: 1 8
T: 1 1
R: 12 16
S: 1.0470 8.6153
L: 2040 208
D: 64 8
Counters
SF: 54574 54572
SFErr: 38 0
RS: 7422128 463862
RSCorr: 3473 4
RSUnCorr: 219 0

HEC: 30 0
OCD: 0 0
LCD: 0 0
Total Cells: 17715453 0
Data Cells: 668594 0
Drop Cells: 0
Bit Errors: 0 0

ES: 7 0
SES: 0 0
UAS: 19 0
Total time = 15 min 58 sec
SF = 54574
CRC = 38
LOS = 0
LOF = 0
ES = 7
Latest 1 day time = 15 min 58 sec
SF = 54574
CRC = 38
LOS = 0
LOF = 0
ES = 7
Latest 15 minutes time = 58 sec
SF = 3422
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 51152
CRC = 38
LOS = 0
LOF = 0
ES = 7
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0

I've noticed that the CRC errors are better when the SNR is above 8db but most of the time it's below 8db.