Multi-Tech Systems MT2834BL Series Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP

Chapter 8 - Dip-Switch Settings

Switch #3

dB Transmission Levels

(Asynchronous/Synchronous Mode/Leased Line)

DIP-Switch #3 adjusts dB transmission levels required by some phone carriers. Place DIP-Switch #3 in the DOWN position to enable -9 dB transmission. Place DIP-Switch #3 in the UP position to enable -15 dB transmission.

-9dB Transmission	=	Switch #3 DOWN
-15dB Transmission	=	Switch #3 UP
Factory Default Setting	=	DOWN

Switch #4

AS/400 Mode

(Synchronous Mode/Leased Line/Dial-UP)

The modem can function in the IBM AS/400 environment (appearing like an IBM5853 modem). First, DIP-Switch #7 must be placed in the UP position. This establishes an RTS/CTS condition (state typical for an IBM5853 modem in half-duplex mode). Next, place DIP-Switch #4 in the DOWN position. This "spoofs" the modem into operating like an IBM5853 modem in AS/400 applications. DIP-Switch #4 in the UP position disables this function. Note that the modem must be in Command mode to allow AS/400 mode (DIP-Switch #8 DOWN); and in Synchronous mode (DIP-Switch #12 UP).

AS/400 Mode Enabled	=	Switch #4 DOWN
AS/400 Mode Disabled =		Switch #4 UP
Factory Default Setting	=	UP

Switch #4

Unix UUCP Spoofing

(Asynchronous Mode/Leased Line/Dial-Up)

The modem can be configured for use with Unix equipment which employs ACK flow control to monitor data integrity. The modem can do "UUCP spoofing", where the modem is able to generate ACKs at the DTE interface. Data then is transmitted more time-efficiently, because the delay of waiting for data to be received then waiting for the ACK to be returned at the remote end, is eliminated. Placing DIP-Switch #4 in the DOWN position enables UUCP spoofing.

UUCP Spoofing Enabled	=	Switch #4 DOWN
UUCP Spoofing Disabled	=	Switch #4 UP
Factory Default Setting	=	UP

Switch #5

Enable/Disable Auto-Answer - "Ans"

(Asynchronous Mode/Synchronous Mode/Dial-Up)

In some originate-only applications, you may wish to disable the modem’s automatic answering capabilities. This may be true if you have a telephone set attached to a modem and wish to receive voice calls that you yourself would answer instead of the modem. Place DIP-Switch #5 in the UP position to enable Auto-Answer. Place DIP-Switch #5 in the DOWN position to disable Auto-Answer.

Auto-Answer Enabled	=	Switch #5 UP
Auto-Answer Disabled	=	Switch #5 DOWN
(Factory Default Setting	=	UP)

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 79