IBM MOBILE COMBO ADAPTER PRO/100 SP - Manual (Page 36)

5 = X2 selected
6 = X3 selected
7 = X4 selected (Default)
Bit 7 Pulse dial make/break ratio (&Pn)
0 = 33/67 make/break ratio (&P1, &P2) (Default)
1 = 39/61 make/break ratio (&P0)
Default: 112 (01110000b)
S24 Timer to Control Sleep Mode
This command displays the number of seconds of inactivity (no characters sent
from the DTE, no RING) in the off-line command state before the modem
places itself into standby mode. A value of zero prevents standby mode. S24 is
an alias for S89.
Note: If a number between 1 and 4 is entered for this register, it will set the
value to 5, and the inactivity before standby will be 5 seconds. This is
done for compatibility with previous products which allowed time-outs
down to 1 s.
Range: 0, 5-65
Default: 10
S28 V.34 Modulation Enable/Disable
This register enables/disables V.34 modulation.
0 = disabled, 1 = enabled
Range: 0 -1
Default: 1
S30 Inactivity Timer
S30 specifies the length of time (in minutes) that the modem will wait before
disconnecting when no data is sent or received. This function is only applicable
to buffer mode.
B-10 Intel
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PRO/100 SP Mobile Combo Adapter: User’s Guide