User's Manual

S33 – Sleep Mode Timer
S33 determines when the modem enters sleep or power-down mode. When
enabled (S33 =/ 0), the controller enters sleep modem whenever the modem
has been in-active for a user-programmable time delay (S33). The modem is
considered to be in an inactive state when:
1. No internal processing is being performed
2. No activity occurs between the host and the modem within a specified time
period
3. The modem is off-line
The modem exits sleep mode whenever the host reads or writes to the modem
or when a ring signal is detected Sleep mode is disabled by setting S33 to ‚0‘.
Range: 0-255 sec
S37– Maximum Line Speed Attempted
This S-Register selects the maximum line speed allowable (that is, the modem
attempts to connect at this speed or falls back to a lower speed). Settings for
Bn, +MS=m, Nn, and S37 determine the allowable modem connections. S37
provides the same information as the +MS=m <max rate> parameter.
Changing the +MS=m <max rate> parameter automatically changes the value
of S37. For ex-ample, setting +MS=m <max rate> to 0 sets S37 to 0. Note that
S37 has no effect during V.32 bis retraining/rate negotiation
n = 0 DTE Rate
n = 1 Reserved
n = 2 Reserved
n = 3 300
n = 4 Reserved
n = 5 1200
n = 6 2400
n = 7 4800
n = 8 7200
n = 9 9600
n = 10 12,000
n = 11 14,400
n = 12 16,800
n = 13 19,200
n = 14 21,600
n = 15 24,000
n = 16 26,400
n = 17 28,800
n = 18 31,200
n = 19 33,600
n = 20 36,000
n = 21 33,333
n = 22 37,333
n = 23 41,333
n = 24 42,666
n = 25 44,000
n = 26 45,333
n = 27 46,666
n = 28 48,000
n = 29 49,333
n = 30 50,666
n = 31 52,000
n = 32 53,333
n = 33 54,666
n = 34 56,000
n = 35 57,333
*Current download speeds are limited to 53,333 bps due to the limited power levels of the PSTN
4-8 S-REGISTERS