User's Guide

COMSPHERE 3821Plus Modem

3-24 February 1998 3821-A2-GB20-30

Table 3-4

(6 of 6)

DTE Interface Configuration Options

TX Clock Source: Internal

Nxt Internal External RXC_Loop

This configuration option only appears when Async/Sync Mode is configured for Sync.

Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the DTE.

Internal – The transmit data’s clock source is derived from the modem’s internal clock and output on Pin 15 (TXC) of the

RS-232D interface.

External – The transmit data’s clock source is provided by the DTE on Pin 24 (EXT) on the RS-232D interface. This

configuration option automatically disables Autorate, Automode, and Asymmetric Rate mode when running V.34

modulation.

RXC Loop – The modem’s transmit clock is derived from its received signal and is output on Pin 15 (TXC) of the

RS-232D interface.

NOTE: This configuration option only appears if Async/Sync Mode is configured for Sync.

The factory default is Internal.

AT command equivalent is &X

DTE Rate=VF: Disable

End Disable Enable

DTE Rate = VF Rate. Forces the data rate of the connection between the DTE (computer) and the modem to be the

same as the VF (telephone line) rate.

Disable – The DTE rate is the value of the Async DTE Rate configuration option.

Enable – The DTE rate is identical with the VF rate.

The factory default is Disable.

AT command equivalent is S-register S90=