40CHAPTER 5: USING THE MODEM
S29 Bit-mapped. Default = 0 for 4 seconds. Stored
Bits 5-0. V.42 acknowledgment timer (T401)(%W CMD). These six bits are interpreted as an integer that specifies the number of 100 millisecond increments which are added to the base value of four seconds in order to arrive at the T401 value. Because of the way it is specified here, the minimum value of T401 is 4 seconds and the maximum value of T401 is 10.3 seconds. The default value is zero which corresponds to a T401 value of 4 seconds.
Bit 6. V.42 frame check sequence (%R CMD)
■0 = Always use CRC-16
■1 = Attempt use if CRC-32
Bit 7. V.42 selective reject (%S CMD)
■0 = Disabled
■1 = Enabled
S30 Bit-Mapped. Default = 15 packet. Storable.
Bits 4-0. V.42 windows size (k) (%K command). These 5 bits are interpreted as an integer that specifies the maximum number of unacknowledged packets that V.42 and MNP will allow at anytime. Although the bits may be set to any value between 0 and 31 a setting of zero is undefined and should not be used. The default value is 01111 (binary) = 15 (decimal).
Bit 5. Negative ADP (%P CMD)
■0 = Disabled
■1 = Enabled
Bit 6. Force asynchronous MNP (Class 2)(%Y CMD)
■0 = Do not force asynchronous MNP
■1 = Force asynchronous MNP
Bit 7. V.42 remote loopback test (%T CMD)
■0 = Ignore loopback frame received from remote
■1 = Process loopback frame received from remote
