FECO COMMS # 29

	FECO:	COMMS # 29
	MODIFICATION No:	N/A
	PRODUCT:	RACAL MAXAM III+ MODEM
	SUB-ASSEMBLY	N/A
	ESTIMATED MAN HOURS	N/A
	CLASS OF CHANGE:	INFORMATIONAL
	REASON FOR CHANGE:	TO INTRODUCE THE MAXAM III+ DIAL UP MODEM

1.The Racal-Milgo Maxam III+ auto dial modem is used as a dial in diagnostic support modem, or a leased line
        modem. The modem is also known as a Racal-Vadic VI2422PA modem.

2.It is powered from an external power supply that is unique to the Maxam III+ and must not be used on any
        other of the maxam range. The front and rear views are shown below.

        (tech serv ref: 22/1/3)

3.Specification

4.Internal jumpers

4.1.to access the interior. Invert the unit and release the 4 interior holding clips by using a small screw driver to
        ease the clips towards the centre. The case splits into two, top and bottom and the interior card may be
        accessed. Carefully remove the top case off of the switches.

4.2.header straps

        As per factory setting except for

        W7 tinkle suppression enable

        W10 tel ring enable

        W11 tel tip enable

5.On power up the LCD display will show the following sequence.

7.configuration dial up

7.1.connect a vdu to the modem.

        Enter at and expect ok response

        Enter at*t1 to display current settings - note these

        Enter at&f to default to factory settings

        Enter at*c1*e1*d1*u1&w

        Where *t1 - displays settings

        *c1 - enables speed conversion

        *e1 - automatic connection with or without error control

        *d1 - data compression

        *u1 - v42 error control

        &w - saves configuration to memory

        &f - factory default

8.configuration 2 wire leased line.

8.1.switch bank 1 - set 1 off

        2 on

        3 off

        4 on

8.2.jumpers W9, W8 & W21 all on

8.3.through the front panel set option 30 to:-

        For host end of link 2

        For peripheral end of link 3

        Press the option front panel button.

        The lcd panel will display "option:"

        Press 3, 0, then enter.

        The LCD panel will display existing setting, e.g. "op 30*1".

        To change the setting press 2 or 3 as detailed above, then press enter. The LCD display will show the new
        setting, then show "option:".

        Press the reset button to initialise the unit.

Return to Index