Card Type	Serial multiplexer, telephony
Chipset	Unidentified
I/O Options	Serial ports (4), FABB bus
Data Bus	8-bit ISA
Card Size	Full height, three-quarters length

CONNECTIONS
Function	Label	Function	Label
Serial ports via DB-37 connector	CN1	Franklin Above Board Bus	CN3
Franklin Above Board Bus	CN2
Note:Standard DB-25 serial ports are provided on an included adapter cable.

FABB BUS SELECTION
Setting	JP5/A	JP5/B	JP5/C	JP5/D
0	Closed	Open	Open	Open
1	Open	Closed	Open	Open
2	Open	Open	Closed	Open
3	Open	Open	Open	Closed

FABB BUS SELECTION
Setting	JP6/A	JP6/B	JP6/C	JP6/D
0	Closed	Open	Open	Open
1	Open	Closed	Open	Open
2	Open	Open	Closed	Open
3	Open	Open	Open	Closed
Note:JP5 and JP6 select receive bus and transmit bus. It is not known which jumper block selects which, although they are generally set to the same bus.

FABB CHANNEL SELECTION
Setting	JP1/A	JP1/B	JP1/C	JP1/D	JP1/E
0	Closed	Closed	Closed	Closed	Closed
1	Closed	Closed	Closed	Open	Closed
2	Closed	Closed	Closed	Closed	Open
3	Closed	Closed	Closed	Open	Open
4	Closed	Closed	Open	Closed	Closed
27	Open	Open	Closed	Open	Open
28	Open	Open	Open	Closed	Closed
29	Open	Open	Open	Open	Closed
30	Open	Open	Open	Closed	Open
31	Open	Open	Open	Open	Open
Note:A total of 32 channel settings are available. The jumpers are a binary representation of the decimal addresses. JP1/A is the Most Significant Bit and jumper JP1/E is the Least Significant Bit. The jumpers have the following decimal values: JP1/E=1, JP1/D=2, JP1/C=4, JP1/B=8, JP1/A=16, . Open the jumpers and add the values of the jumpers that are open to obtain the correct channel. (Open=1, Closed=0) The settings for JP2 through JP4 are identical to those for JP1. JP1 sets the FABB channel for serial port 1, and JP2 through JP4 set the FABB channel for serial ports 2 through 4, respectively.