&Xn - Select Sync Transmit Clock Source

Command Line Format
AT [cmds] &X [suffix] [cmds] <CR>

Suffix Values
0 through 2

Factory Default
&X0

Stored by &Wn
yes

Displayed by &V
yes

Description
This command determines how the DTE transmit clock is generated while the modem is in the synchronous mode.

&X0 - The modem generates the transmit clock and applies it to pin 15 (RS-232).

&X1 - The DTE generates the transmit clock on pin 24 (RS-232) and the modem applies this clock to pin-15 (RS-232).

&X2 - The modem derives the transmit clock from the receive carrier signal and applies it to pin-15 (RS-232).

DTE Interface Lines Affected
Clock leads (Pins 15, 17, & 24)

Cross Reference
Commands - &Qn
DTE signals - SCTE, SCT, SCR

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