FWIW telnet current states...
Many thanks for all your replies - on reflection, I don't think I had interleaving with the HH5A-simply as the link never went down until I replaced it with the HG612
Looking at the line stats (in the post above) it states:
Interleave depth: 1 1
INP: 0 0
G.INP: Not enabled
which from the helpful interleaving guide on the main site means (I believe) I was also on Fast Path when I connected the HG612
However, I was remotely disconnected this morning and it looks as if the exchange has applied interleaving.
My line currently reports:
xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 20892 Kbps, Downstream rate = 58048 Kbps
Bearer: 0, Upstream rate = 10000 Kbps, Downstream rate = 39994 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 20892 kbps 58048 kbps
Actual Aggregate Tx Power: 7.1 dBm 13.3 dBm
xdslcmd info --Hlog
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 20949 Kbps, Downstream rate = 58276 Kbps
Bearer: 0, Upstream rate = 10000 Kbps, Downstream rate = 39994 Kbps
SLAM/MSAN type: BDCM:0xa48c / v0xa48c
Modem/router firmware: AnnexA version - A2pv6C038m.d24j
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 1 hours 28 min 49 sec
Resyncs: 1 (since 20 Aug 2015 19:42:53)
Downstream Upstream
Line attenuation (dB): 16.2 0.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 39994 10000
SNR margin (dB): 8.8 12.0
Power (dBm): 13.3 7.1
Interleave depth: 1283 211
INP: 3.50 4.00
G.INP: Not enabled
RSCorr/RS (%): 0.0002 0.0278
RSUnCorr/RS (%): 0.0000 0.0000
ES/hour: 3.35 3.29
which is the first time I have ever seen the max upstream over 18MB (or a reference to Upstream rate = 10000 Kbps) and the download max attainable speed is similar to that of the HH5A.. - not sure why the line didn't go straight to G.INP though..
I would post some graphs (some can obviously see them online on the my dsl stats website) but havent been able to get HG612 Modem stats to play with XP (it refuses to schedule a task)
PS: not sure it impacts matters at all but am using a MK3 master socket but the only change to the line was that I had caller ID enabled in the early hours..