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Black Box 34336, MD885AE-R2, MD885C-R2, MD885A-R3 user manual Modem

Models: MD885C-R2 MD885A-R3 MD885AE-R2 34336

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Modem 34336

The Buffer Mode/Speed Conversion option Hayes, V.25 bis, Dumb, Leased line modes (except V.33). It enables or disables speed conversion (for asynchronous operation only) between the DTE and modem when error correction is not used.

•ENABLE — When error correction is not enabled, the V.42 circuit functions as a buffer between the DTE and the modem and provides transmission speed conversion.

•DISABLE — Speed conversion is not allowed.

The DTE Speed option is available for Hayes, V.25 bis, Dumb, Leased-Line modes (except V.33). It controls the DTE speed; however, it is effective only when the modem is operating in V.42 mode, MNP mode, or buffer mode. The DTE speed can be set for 115,200, 57,600, 38,400, 19,200, 9600, 4800, 2400, 1200, 600, 300, or 110 bps. The default "DTE speed" is 38,400 bps. DTE speed refers to the speed of data transfer between the DTE and the local modem. It is not necessarily the same as the data transmission speed between the connected modems. If flow control is disabled, the DTE speed must be equal to or less than the modem speed, and the local and remote DTE speeds must be equal.

For Hayes mode operation, the DTE Speed option sets the default DTE speed that will be effective after powerup or after a full modem reset. However, the default DTE speed is automatically overridden when the Modem is autobauded (when an AT attention code is sent to the Modem).

The Flow Control options control the data flow according to the availability of memory space in the V.42 buffer. Flow control can be set independently for the modem to the terminal and for the terminal to the modem. The flow-control options include DTE-DCE, DCE-DTE and Pass-Through Flow Control, and Flyback Buffer.

NOTE

When flow control is disabled, the DTE data rate must be equal to or less than the modem data rate, and the local and remote DTE data rates must be equal. (This precludes the need for flow control, which some computers and terminals cannot handle, and avoids buffer overflow.)

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Black Box 34336, MD885AE-R2, MD885C-R2, MD885A-R3 user manual Modem
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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