19A705178
REV NO. TITLE
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ROCKWELL MODEM TEST
SPECIFICATION/PURCHASE PART DRAWING
CONT ON SHEET SH NO. FIRST MADE FOR
F. C. F. O.
MADE BY
R Sager
APPROVALS
DCB
M. R. P. D.
DIV OR DEPT.
19A705178
ISSUED
Nov. 19, 1986
11-18-86
LYNCHBURG
LOCATION
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REVISIONS
L30
PRINTS TO
Threshold Options
Four threshold options are provided:
1. Greater than -43 dBm (RLSD on)
Less than -48 dBm (RLSD off)
2. Greater than -33 dBm (RLSD on)
Less than -38 dBm (RLSD off)
3: Greater than -26 dBm (RLSD on)
Less than -31 dBm (RLSD off)
4. Greater than -16 dBm(RLSD on)
Less than -21 dBm (RLSD off)
NOTE
Performance may be at a reduced level when the
received signal is less than -43 dBm.
For CCITT configurations. a minimum hysteresis action of
2dB exists between the actual off-to-on and on-to-off
transition levels. The threshold levels and hysteresis action
are measured with unmodulated 2100 Hz tone applied to
the receiver’s audio signal input (RXA)
MODES OF OPERATION
The R96FT capable of being operated in either a serial or a
parallel mode of operation.
Serial Mode
The serial mode uses standard V.24 (RS-232-C
compatible) signals to transfer channel data. An optional
USRT device (shown in the Functional Interconnect
Diagram) illustrates this capability.
Parallel Mode
The R96FT has the capability of transferring channel Data
(up to eight bits at a time) via the microprocessor bus.
Mode Selection
For the transmitter, a control bit determines whether the
source of transmitted data is the V.24 interface (serial
mode) or the parallel transmitter data register (parallel
mode).The transmitter automatically defaults to three serial
mode at power-on.
The receiver simultaneously outputs received data via the
V.24 interface and he parallel receiver data register.
In either parallel or serial mode, the R96FT is configured
by the host processor via the microprocessor bus.
INTERFACE CRITERIA
The modem interface comprises both hardware and
software circuits. Hardware circuits are assigned to specific
pins in a 64-pin DlN connector. Software circuits are
assigned to specific bits in a 48-byte interface memory.
Hardware Circuits
Signal names and descriptions of the hardware circuits,
including the microprocessor interface, are listed in the
R96FT Hardware Circuits table. In the table, the column
titled "Type" refers to designations found in the Hardware
Circuit Characteristics. The microprocessor interface is
designed to be directly compatible with an 8080
microprocessor. With the addition of a few external logic
gates, it can be made compatible with 6500, 6800 or 68000
microprocessors.
R96FT Functional Interconnect Diagram
(61 strony)
(98 strony)
(90 strony)
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