The following tests may be of interest..
A TalkTalk LLU subscriber line (my parents) was used for the tests. The DSLAM has an Infineon-chipset.
Six modems were tested on the line.
BT Business Hub BT2700HGV - with a Trimedia TM3260 core and an STMicro ST20184 DSL chipset
BT Business Hub 2701HGV-C - with a Trimedia TM3260 core and a SiLabs Si3112 DSL chipset
BT Home Hub 3.0a - with a Lantiq XWAY ARX168 dual MIPS32/Protocol Processor Engine inc AFE/line driver
BT Home Hub 3.0b - with a Broadcom BCM6361 dual MIPS32 core with integrated AFE/line driver.
BT Business Hub 3.0 - with a Lantiq XWAY ARX168 dual MIPS32/Protocol Processor Engine inc. AFE/line driver
Huawei HG612 (BT Openreach FTTC CPE) - with a Broadcom BCM6368 dual MIPS32 core with integrated AFE/line driver.
Each of these six modems was synced on the line to obtain the basic line statistics data from the GUI/telnet interface. Each modem was synced once, and then the next modem was tested. In total, each modem was tested three times. Eighteen tests altogether. The highest sync speed for each modem was the one recorded in the results. The HG612 was configured to sync in ADSL2+ (G.992.5) mode rather than VDSL2 (G.993.2) No account was made for transmission/frame errors, just raw sync speeds.
In order of highest d/s sync speed first, the modems performed as follows:
d/s u/s
HG612 17332 Kbps 1116 Kbps
BH3.0 16937 Kbps 1021 Kbps
HH3.0a 16752 Kbps 1104 Kbps
HH3.0b 15868 Kbps 1020 Kbps
2701HGV-C 15610 Kbps 1032 Kbps
2700HGV 15240 Kbps 1076 Kbps
Several gremlins appear present in the modems' GUIs:
The downstream rates (sync and actual) for the 2701HGV-C appear to be swapped
The downstream output power (dBm) for the HH3.0b appears to be permanently zero
The downstream rates for the HH3.0a, HH3.0b and BH3.0 appear to be full sync rates,
whereas the upstream rates for the HH3.0a, HH3.0b and BH3.0 appear to be actual rates.EDIT:Now that secure shell access has been gained by the PsiDOC.com team, we can see that the HH3.0a GUI reports real data rates, after overheads. The BH3.0 is based on identical hardware to the HH3.0a. It is not yet unlocked, so we can't be sure, but it is almost certainly reporting real data rates in its GUI, too. If so, its raw sync rate can only be higher.
cheers, a
BT Business Hub BT2700HGV (2Wire 2700HGV)Hardware version: 2701-100589-005
Software Version: 6.1.1.48.1-enh.tm
From:
http://192.168.1.254/xslt?PAGE=C_1_0DSL Details
Modem Type: Built in modem - ADSL
DSL Line (Wire Pair): Line 1 (inner pair)
Current DSL Connection:
Down Up
Rate: 15240 kbs 1021 kbs
Max Rate: 15240 kbs 1076 kbs
Noise Margin: 8.9 dB 10.2 dB
Attenuation: 20.6 dB 8.9 dB
Output Power: 20.8 dBm 12.2 dBm
Protocol: G.DMT2+ Annex A
Channel: Interleaved
DSLAM Vendor Information Country: {46336} Vendor: {IFTN} Specific: {50801 }
ATM PVC: 0/38
Rate Cap: 15240 kbs
Attenuation @ 300kHz: 20.6 dB
Uncanceled Echo: -24.4 dB Ok
VCXO Frequency Offset: -48.8 ppm Ok
Final Receive Gain: -0.1 dB Ok
Impulse Noise Comp. Tones: 0 Ok
Excessive Impulse Noise: 0 Ok
BT Business Hub 2701HGV-C (2Wire 2701HGV-C)Hardware version: 2701-100630-008
Software version: 6.3.9.41-plus.tm
From:
http://192.168.1.254/xslt?PAGE=C_1_0DSL Details
Modem Type: Built in modem - ADSL
DSL Line (Wire Pair): Line 1 (inner pair)
Current DSL Connection:
Down Up
Rate: 15610 kbs 1021 kbs
Max Rate: 15153 kbs 1032 kbs
Noise Margin: 8.9 dB 9.1 dB
Attenuation: 20.5 dB 8.7 dB
Output Power: 20.7 dBm 11.4 dBm
Protocol: G.DMT2+ Annex A
Channel: Interleaved
DSLAM Vendor Information Country: {46336} Vendor: {IFTN} Specific: {50801 }
ATM PVC: 0/38
Rate Cap: 15153 kbs
Attenuation @ 300kHz: 20.5 dB
Uncanceled Echo: -25.2 dB Ok
VCXO Frequency Offset: -51.2 ppm Ok
Final Receive Gain: 13.5 dB Ok
Excessive Impulse Noise: 0 Ok
BT Home Hub 3.0aSoftware version 4.7.5.1.83.8.57
.1.3 (Type A)
From:
http://192.168.1.254/index.cgi?active_page=9116 / secure shell console
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 01:25:54
Downstream: 16.11 Mbps (16,497 Kbps)
Upstream: 1021 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Interleaved
Noise margin (Down/Up): 8.6 dB / 11.0 dB
Line attenuation (Down/Up): 15.9 dB / 8.5 dB
Output power (Down/Up): 20.1 dBm / 11.7 dBm
FEC Events (Down/Up): 9207 / 0
CRC Events (Down/Up): 61 / 32
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 1015 / 7
Error Seconds (Local/Remote): 34 / 0
asbokid@home:~/# ssh admin@192.168.1.254
admin@192.168.1.254's password:
BT Home Hub 3.0A> dsl line_status
Device enabled: Yes
Status: Connected
Line modulation: G.992.5 Annex A
Line encoding: DMT
Data path: Interleaved
Interleave depth: 64
Upstream current rate: 1020 Kbps
Downstream current rate: 16497 Kbps
Upstream max line rate: 1104 Kbps
Downstream max line rate: 16752 Kbps
Upstream noise margin: 11.00 dB
Downstream noise margin: 8.50 dB
Upstream line attenuation: 8.50 dB
Downstream line attenuation: 15.90 dB
Upstream power: 11.70 dB
Downstream power: 20.10 dB
Upstream bitswaps requested: 0
Upstream bitswaps deferred, rejected: 0
Upstream bitswaps completed: 0
Upstream bitswaps aborted: 0
Downstream bitswaps requested: 1306
Downstream bitswaps deferred, rejected: 0
Downstream bitswaps completed: 1306
Downstream bitswaps aborted: 0
Showtime start: 7392 seconds
Quarter hour start: 192 seconds
ATU-R vendor: 34353637
ATU-R country: 3233
ATU-C vendor: 4946544E
ATU-C country: B500
Showtime RX blocks: 289086
Showtime TX blocks: 288988
Showtime loss of framing errors:0
Showtime errored seconds: 34
Showtime severely errored seconds: 0
Showtime FEC errors: 9207
Showtime ATU-C FEC errors: 0
Showtime HEC errors: 1015
Showtime ATU-C HEC errors: 7
Showtime CRC errors: 61
Showtime ATU-C CRC errors: 32
Showtime cell-delineation errors: 0
Showtime link-retrain errors: 0
Showtime initialization errors: 0
Showtime initialization timeout errors: 0
Current day RX blocks: 289086
Current day TX blocks: 289086
Current day loss of framing errors: 0
Current day errored seconds: 34
Current day severely errored seconds: 0
Current day FEC errors: 9207
Current day ATU-C FEC errors: 0
Current day HEC errors: 1015
Current day ATU-C HEC errors: 7
Current day CRC errors: 61
Current day ATU-C CRC errors: 32
Current day cell-delineation errors: 0
Current day link-retrain errors:2
Current day initialization errors: 0
Current day initialization timeout errors: 0
Quarter hour RX blocks: 11294
Quarter hour TX blocks: 11294
Quarter hour loss of framing errors: 0
Quarter hour errored seconds: 0
Quarter hour severely errored seconds: 0
Quarter hour FEC errors: 0
Quarter hour ATU-C FEC errors: 0
Quarter hour HEC errors: 0
Quarter hour ATU-C HEC errors: 0
Quarter hour CRC errors: 0
Quarter hour ATU-C CRC errors: 0
Quarter hour cell-delineation errors: 0
Quarter hour link-retrain errors: 0
Quarter hour initialization errors: 0
Quarter hour initialization timeout errors: 0
BT Home Hub 3.0A>
BT Home Hub 3.0bSoftware version V100R001C01B031SP09_L_B
From:
http://bthomehub.home/html/settings/a_adsl.htmlADSL Line Status
Connection information
Line state: Connected
Connection time: 0 day, 00:00:54
Downstream: 15,868 Kbps
Upstream: 1,020 Kbps
ADSL settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Interleaved
Noise margin (Down/Up): 9.2 dB / 12.5 dB
Line attenuation (Down/Up): 19.5 dB / 9.0 dB
Output power (Down/Up): 0.0 dBm / 12.4 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 0 / 0
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
HEC Errors (Down/Up): 8 / 0
Error Seconds (Local/Remote): 0 / 0
BT Business Hub 3.0 Software version 4.7.5.1.83.8.77 (Type A)
From:
http://192.168.1.254/index.cgi?active_page=9119ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 00:01:34
Downstream: 16.54 Mbps (16,937 Kbps)
Upstream: 1021 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Interleaved
Noise margin (Down/Up): 8.9 dB / 11.6 dB
Line attenuation (Down/Up): 17.0 dB / 8.4 dB
Output power (Down/Up): 20.0 dBm / 12.0 dBm
FEC Events (Down/Up): 210 / 0
CRC Events (Down/Up): 1 / 64
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 12 / 14
Error Seconds (Local/Remote): 1 / 0
Huawei EchoLife HG612 Hardware version B482FE-21530304288K04006088
Software version V100R001C01B028SP10
From telnet console:
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max: Upstream rate = 1116 Kbps, Downstream rate = 17332 Kbps
Path: 0, Upstream rate = 1020 Kbps, Downstream rate = 15401 Kbps
Link Power State: L0
Mode: ADSL2+
TPS-TC: ATM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 9.1 12.2
Attn(dB): 19.0 9.7
Pwr(dBm): 20.8 12.3