Technical data

c. Connect the telephone line from the telephone to the module
cover.
• To install voice communication on modem A, insert the
telephone line into the second jack from the top of the
module cover, marked with the telephone icon.
• To install voice communication on modem B, insert the
telephone line into the second jack from the bottom of the
module cover, marked with the telephone icon.
7.5.4 Setting Up Terminal Lines
Before you can use the DFA01 modem, you must set up the operating system
software to recognize the modem.
Set up the operating system software to support the following four terminal
lines for the modem.
• Modem A — primary channel
• Modem A — on-line control channel (OLC)
• Modem B — primary channel
• Modem B — on-line control channel (OLC)
Refer to the operating system documentation to determine how to make
permanent terminal line definitions, so that every time the system is turned
on the terminal lines are configured for proper operation.
You may need to define the following terminal line characteristics.
• Modem control — to support full EIA modem control.
• Speed, parity, and data bits — terminal lines should be set to 2400 baud,
parity disabled, and 8 data bits to coincide with the modem power-up
defaults.
• Dial up — to support dial-up operation.
• Hang up — to disable automatic hang up of the lines when logging out
or when completing a dialog with the modem using terminal emulation
software.
With automatic hang up disabled, you can modify the modem operating
parameters (from application software or when using a terminal
emulator). You can then exit the program without the modem resetting
those parameters to power-up default values.
30 VAX 4000 Model 300 Installation