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MultiModemBA User Guide
Switch #3
dB Transmission Levels
(Asynchronous/Synchronous Mode/Leased Line)
2834 Series:
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
1432 and 932 Series:
DIP-Switch #3 adjusts dB transmission levels required by some phone carriers. Place DIP-Switch #3
in the DOWN position to enable 0 dB transmission. Place DIP-Switch #3 in the UP position to enable
-10 dB transmission.
0dB Transmission = Switch #3 DOWN
-10dB 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