Black Box MD1641A, MD1640A manual 132

SERIES II INTELLIGENT DATA/FAX MODEMS

Originate Mode Enabled	=	Switch #5 DOWN
Answer Mode Enabled	=	Switch #5 UP
Factory Default Setting	=	UP)

Switch #6

Maximum Throughput Setting

(Asynchronous Mode/Leased Line/Dial-Up)

Some applications require you to dial into services with maximum throughput on, and other applications where maximum throughput must be off (i.e., service not supporting error correction, or the V.42 handshake interferes with logon sequence). DIP-Switch #6 is used for switching between these two modes. This DIP-Switch controls three important parameters (error correction, speed conversion and serial port speed), which in effect enables or disables maximum throughput.

Maximum Throughput Enabled	=	Switch #6 UP
Maximum Throughput Disabled =		Switch #6 DOWN
Factory Default Setting	=	UP

Switch #6

Slave Clocking

(Synchronous Mode/Leased Line/Dial-Up)

In Synchronous mode, DIP-Switch #6 controls the option of having timing controlled by the receive clock. The originate modem, in effect, adjusts to the answer (remote) modem. Place DIP-Switch #6 in the DOWN position to enable Slave Clocking. Place DIP-Switch #6 in the UP position to disable Slave Clocking.

Slave Clocking Enabled	=	Switch #6 DOWN
Slave Clocking Disabled	=	Switch #6 UP
Factory Default Setting	=	UP

Switch #7

Request To Send Forced - "RTS"

(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)

If your computer or terminal uses RTS-CTS protocol (typically used in some synchronous applications, but also if using hardware pacing for V.42 error correction or speed conversion), you may want to set RTS to function independently of CTS (DIP-Switch #7 UP). For most

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