Thanks, I didn't know that. I can certainly blank out the invalid values, and I'll look at the possibility of changing the plotting dependent on the DSLAM type.
Is this the DSLAM vendor for my connection:-
# xdslcmd info --vendor
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 4497 Kbps, Downstream rate = 32156 Kbps
Path: 0, Upstream rate = 4435 Kbps, Downstream rate = 28075 Kbps
ChipSet Vendor Id: BDCM:0xa350
ChipSet VersionNumber: 0xa350
ChipSet SerialNumber:
If it helps at all, this is the Discovery Phase Band Plan from a Huawei DSLAM.
It's how I determine which of the two DSLAMs is in use:-
Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
This is the Discovery Phase Band Plan from an ECI DSLAM:-
Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)