They were added just under a couple of years ago at the request of one of the resident Kitz experts at stats analysis - there is a discussion starting roughly
here if you can get your head round it.
In there is also this on basically what they mean (originally from Kitz web pages) but not all these are displayed on MDWS as the data is not available
Reed Solomon ParametersMSGc = Number of bytes in overhead channel message
K = Number of bytes in the DMT Frame
B = Number of bytes in the data frame
N = NFEC = Length of codeword (N = K + R)
R = RFEC = RS check bytes / Amount of redundancy
S = Symbols per codeword
T = Number of dataframes in an OH subframe/ Data frames over sync bytes
Q = Number of RS codewords per DTU (g.inp)
V = Number of padding octets per DTU (g.inp)
Interleaving Parameters
I = Number of Interleaver branches / The interleaver block size in bytes. Should be a sub-multiple of N
M = Incremental delay / Number of Mux Data Frames in FEC Data Frame/RScodeword
D = Interleave Depth (D = M * I + 1)
L = LSYMB = Number of bits per symbol in the latency path / Number of bits in PMD data frame
Interleaving introduces a delay of M * I * (I-1)
Actual delay - ADSL shown in ms = [S x D]/4
Actual delay - If retransmission is used this specifies the actual value of the time independent component of the delay due to retransmission only.