Specifications

AN93

Rev. 0.8 41

Figure 10. Phone Line Termination Circuit

&X1 Automatic determination of telephone line type.

Result code: WXYZn

W: 0 = line supports DTMF dialing.

1 = line is pulse dial only.

X: 0 = line supports 20 pps dialing.

1 = line supports 10 pps dialing only.

Y: 0 = extension network present (PBX).

1 = outside line (PSTN) connected directly.

Z: 0 = continuous dialtone.

1 = make-break dialtone.

n: 0–9 (number required for outside line if Y = 0).

&X2 Same as &X1, but Y result (PBX) is not tested.

Y2A

Produce a constant answer tone (ITU-T) and return to command mode. The answer tone continues

until the ATH command is received or the S7 timer expires.

&Z Enter low-power wake-on-ring mode.

Table 21. 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.

RING

Si3018 V

600 Ω

10 µF

–

TIP