Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 78)

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78 Rev. 1.3
&H1 V.90 only (56 kbps to 28 kbps)
&H2 V.34 with automatic fallback (33.6 kbps to 300 bps) (default for Si2434)
&H3 V.34 only (33.6 kbps to 2400 bps)
&H4 ITU-T V.32bis with automatic fallback (14.4 kbps to 300 bps) (default for Si2415)
&H5 ITU-T V.32bis only (14.4 kbps to 4800 bps)
&H6 ITU-T V.22bis only (2400 bps or 1200 bps) (default for Si2404)
&H7 ITU-T V.22 only (1200 bps)
&H8 Bell 212 only (1200 bps)
&H9 Bell 103 only (300 bps)
&H10 ITU-T V.21 only (300 bps)
&H11 V.23 (1200/75 bps)
&H12 V.92 with automatic fallback (default for Si2493)
&Pn Japan pulse dialing*
&P0 Configure ISOmodem for 10 pulse-per-second pulse dialing
&P1 Configure ISOmodem for 20 pulse-per-second pulse dialing (Japan)
&Tn Test mode.
&T2
Initiate ITU-T V.54 (ANALOOP) test. Modem mode set by &H. Test loop is through the DSP and
DAA interface section of the ISOmodem only. ISOmodem echoes data from TX pin (Hardware Inter-
face Register 0 in parallel or SPI mode) back to RX pin (Hardware Interface Register 0 in parallel or
SPI mode). This test mode is typically used during board-level debug.
&T3
Initiate ITU-T V.54 (ANALOOP) test. Modem mode set by &H. Test loop is through the DSP (ISOmo-
dem), DAA interface section (ISOmodem), ISOcap interface (Si3018/10), and analog hybrid circuit
(Si3018/10). ISOmodem echoes data from TX pin (Hardware Interface Register 0 in parallel or SPI
mode) back to RX pin (Register 0 in parallel or SPI mode). Phone line termination required as in
Figure 25. In order to test only the ISOcap link operation, the hybrid and AFE codec can be removed
from the test loop by setting U62 [1] (DL) = 1.
&T4
Initiate transmit as originating modem with automatic data generation. Modulation, data rate, and
symbol rate are set by &H, &G, and S41. Data pattern is set by the S40 register. Continues until the
ATH command is sent after an escape into command mode. Data are also demodulated as in
ANALOOP. The test can be ended by escaping and issuing the ATH command.
&T5
Initiate transmit as answering modem with automatic data generation. Modulation, data rate, and
symbol rate are set by &H, &G, and S41. Data pattern is set by the S40 register. Continues until the
ATH command is sent after an escape into command mode. Data are also demodulated as in
ANALOOP. The test can be ended by escaping and issuing the ATH command.
&T6
Compute checksum for firmware-upgradeable section of program memory. If no firmware upgrade
is installed, &T6 returns C:4474.
&Xn Automatic determination of telephone line type.
&X0 Abort &x1 or &x2 command.
Table 40. Extended AT& Command Set (Continued)
Notes:
1. The initial number attempted to test for an outside line is controlled by S51 (default = 1).
2. AT&$ reflects the last AT&P command issued but does not reflect any subsequent changes made by writing U registers
with AT:U.