Document text
Product Bulletin 933 — 1080
FM-12 DATA SET
A fully compatible , reliable data set
available in a variety of configurations
FM-12 MODULES
FOUR FM-1
IN MOUNTING ASSEMB
DESCRIPTION: The Rixon FM - 12 Data Set is a
low speed modem for transmitting and receiving
digital data over telephone circuits at speeds up
to 1200 bits per second ( 150 characters per sec¬
ond). Built to comply with EIA RS -232 B inter¬
face standards, it is compatible with a wide vari¬
ety of business machines and data processing
equipment.
VARIABLE CONFIGURATION: To meet a wide
range of applications, various configurations of
the FM - 12 are available. For OEM installations
where the data set is to be built into terminal
equipment, a plug-in module set which contains
all circuitry is available. The FM - 12 can also
be packaged as a complete assembly, with or with¬
out a power supply, for mounting in a standard
19" rack. Also available is a unit for desk top
use or shelf mounting. For synchronous operation,
an optional clock is available.
USES TELEPHONE CIRCUITS: The FM - 12 oper¬
ates over Type 3003(Type 4A) telephone circuits
specified in FCC Tariff 260, "Private Line Ser¬
vices." Type 3003 circuits are voice telephone
channels which have been conditioned for data
transmission.
AUTOMATIC OPERATION: When data is to be
transmitted or received, the data set is activated
automatically by a signal from the computer or
business machine. There are no controls with the
exception of an off-on switch included in some
configurations.
EASY MAINTENANCE: Operational status can be
quickly determined by using strategic test points
on the front of each module that are keyed to op¬
erating and maintenance manual instructions. The
oscilloscope patterns shown in the manual are also
printed on a "service aid" template which is a-
vailable as an option.
PROVEN DESIGN STANDARDS: The FM-12 is
the newest of the Rixon Data Sets. The high stand¬
ards of design perfection and operating reliabil -
ity that have given the other sets a reputation for
excellence have been employed in the design of
the FM - 12. Thousands of hours of trouble-free
*
operation can be expected.
^ For application information and prices contact:
RIXON ELECTRONICS, INC.
2120 Industrial Parkway Silver Spring,Maryland 20904
Telephone 301—622—2121
FM —12 Data Set
SPECIFICATIONS
Data Rate.
Modulation.
Synchronous with optional clock.
Carrier Frequencies.
Line Requirements.
Operating Modes.
Interfaces.
send, clear to send, carrier detector,
data set ready, transmit & receive
clock when used.
All interfaces conform to RS 232 B.
Transmit Line Signal Levels/Impedance;
0 dbm or -8 dbm strap option, 600 ohm
output.
Receive Line Levels/Impedance;
-35 dbm to +6 dbm, 600 ohm input.
Compromise equalization for Type 3003
circuit. Removable on request.
Control Functions.
± .8 ms or 200 ms ± 20 ms.
Receive: Carrier detector
Power Requirements.
Environmental Requirements .
. . . . Ambient Temperature Range 0° to 50° C
(32° to 122°F). Humidity 0-95%.
Altitude up to 10,000 ft.
Mechanical Specifications .
. . . . Module size 8i" x 5 ^8" x 1"/ three
per data set.
Rack mounting assembly 19" wide, 7^" high,
8" deep.
*The output impedance of the transmitter can be adjusted to bridge the receiver input. This allows
half duplex operation over a two wire circuit without a mechanical change from transmit to receive.