C in Vacuum is 299,791,819.008m/s
C * propagation constant in fiber is C*0.67 = 200,860,318.73536 m/s
C * propagation constant in coax is C*0.87 = 260,818,882.53696 m/s
One-Way Transit Delay Constant 0.80
Modem A has a timing offset of 3579
Modem A has a coaxial forward and fiber return, with a distance of 23174.6m in one direction
Forward is 256Q, Reverse is 64Q
.127662+.215255 = .342917
3429.17 Approximately = to 3579 Timing Offset.
Other things to consider...
modem ranging delay? (250)
MAP Interval perhaps?
Am I on the right track for the math side of this?