Motorola and V.32bis - Manual (Page 110)

S-Register 98—AC Detect
This S-Register applies to V.32bis and V.34 operating modes. It enables and disables
AC Tone Protect, which is part of the modem’s training sequence.
S-Register 99—V.32 Training Time
This S-Register extends part of the V.32 modulation mode training time. It provides a
workaround to an inability of Rockwell-based modems to establish a connection.
Motorola recommends that with Rockwell-based modems, you set S-99 to 120.
Stored in Nonvolatile Memory?: Yes
Status-Only?: No
Default: 0
Range: 0 - 1
Stored in Nonvolatile Memory?: Yes
Status-Only?: No
Default: 0
Range: 0 to 216*
*One unit = 32 baud = 13.5 milliseconds.