ds22-l100-041 Conexant Systems, Inc., ds22-l100-041 Datasheet - Page 23

• Manufacturer Part Number: ds22-l100-041
• Description: Cx84100-41/-23 Scxv.22bis Modem V.22bis Modem With Cx20493 Smartdaa? Line Side Device
• Manufacturer: Conexant Systems, Inc.

2.8
2.8.1
2.9
102339C
Diagnostics
Commanded Tests
Low Power Mode
•
Country profiles may be altered or customized by modifying the country-dependent
parameters. Additional profiles may also be included by uploading to internal RAM.
Contact the local Conexant sales office if country code customization is required.
Diagnostics are performed in response to &T commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem,
which loops the data back to the local DTE.
The S24 register sets the length of time, in seconds, that the modem will operate in
normal mode with no detected telephone line or DTE line activity before entering low-
power mode. The timer resets upon any DTE line or telephone line activity. Neither DTE
line nor telephone inactivity will cause the modem to enter into low-power mode if the
S24 is set to zero.
When the S24 timer expires, the modem enters into low-power mode, which has three
variations controlled by –SLP or Select Low-Power Mode command. The low-power
mode can be configured either in idle, sleep, or stop mode as shown in Table 2-3. Either a
ring input or host serial transmit activity will force the modem out of low-power mode
and back to normal mode. Note that the first issued command will get processed during
idle mode but not in sleep or stop mode. The first byte sent merely wakes up the modem,
thus missing the first command. However, subsequent commands will get processed as
normal operating mode resumes.
The device power consumption, which includes the LSD or CX20493, is listed in
Table 3-13.
Table 2-3. Select Low-Power Mode (-SLP) Command Comparison Table
Ring input
Host serial TXD activity
* The first AT command is ignored but modem returns to normal operating mode.
CX84100-41/-23 SCXV.22bis Modem Data Sheet
Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to
the same number when previous call attempts have failed. Call failure can be
detected for reasons such as no dial tone, number busy, no answer, no ringback
detected, voice (rather than modem) detected, and key abort (dial attempt aborted by
user). Actions resulting from such failures can include specification of minimum
inter-call delay, extended delay between calls, and maximum numbers of retries
before the number is permanently forbidden ("blacklisted").
AT-SLP =
Conexant
0 (Idle)
Yes
Yes
1 (Sleep)
Yes*
Yes
2 (Stop)
Yes*
Yes
2-7