Z02215
Single Chip Modem with Integrated Controller, Data Pump, and AFE
39
Table 7. Modem S-Registers (Continued)
Register Range
Default Units
Description
S10
1–255
14
1/10th
second
Delay between lost carrier and hang up. S-register S10 is
the time between loss of the carrier signal from the other
modem and hang up by this modem. The carrier signal may
be lost for periods up to S10 minus S9 without causing the
modem to hang up. Setting S-register S10 to 255 causes the
modem to never hang up the telephone line because of loss of
carrier.
The modem only recognizes a carrier signal after the time
specified in S-register S9. S-register S10 must always be
greater than S-register S9 so a carrier signal can be
recognized before the telephone line goes off-hook.
S11
S12
50–255
0–255
95
50
msecond DTMF tone duration. S-register S11 is the duration of a
DTMF tone. The country configuration may also specify that
S11 is the time between DTMF tones.
1/50th
Escape prompt delay time. Register S12 is the prompt delay
time for escape sequences from the ON-LINE state to the
COMMAND state.
second
S13
S14
S15
S16
S17
Reserved
Reserved
Reserved
Reserved
6 to 43
Reserved Reserved
Reserved Reserved
Reserved Reserved
Reserved Reserved
10
–dBm
Sets transmit level. The actual transmit power used is
adjustable by the country configuration to accommodate
differences in transformers and other components in the
telephone line interface.
S18
S19
S20
S21
S22
S23
S24
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved Reserved
Reserved Reserved
Reserved Reserved
Reserved Reserved
Reserved Reserved
Reserved Reserved
Reserved Reserved
PS001907-0904
Modem S-Registers
ZILOG [ ZILOG, INC. ]
