Comtech EF Data SNM-1010L - Manual (Page 164)

SNM-1010L Data/Control Modem Revision 0
Theory of Operation MN/SNM1010L.OM
The SNM-1010L interfaces with the DAC through an interface bus connector. Eleven
external and internal interfaces are provided as permanent installations on the DAC
board.
A block diagram of the DAC is shown in Figure Chapter 6-1.
NO
N-
VO
LATI
LE
RAM 2K x 8
DRAM 512K byt
es
SEG
M
E NTED
FLASH 512Kbyt
es
80386 50 M
H
Z
CPU CL
K
HDL
C
CO
NTRO
LL
E R
(one hal
f of
Z85230)
TX
DATA
TX
CO
NTRO
L
J1
RX CO
NTRO
L
TX CO
NTRO
L
RX DATA
QU
A D
UART (one hal
f
of
16C
554)
R
S 232
LEVEL TRANS- LATI
O
N
U S E R D A TA
/C
ON
TR
OL
DCE
, RS
232,
19.
2K
B IT /S
Jb
USER/
D
ATA
PO
RT
9 PI
N
M
ini
D
IN
CO
NNECTO
R
HDL
C
CO
NTRO
LL
E
R
(one hal
f of
Z85230) R
S 232
LEVEL
TRANSLATI
O
N
10 PI
N HEADER
DEBUG
G
E R
TEST PO
RT
J5
HDLC RS
232
(par
t of
J1)
96 PI
N
CO
NNECTO
R
T
O
/ F
R
OM
MOD
E M
J8
96-P
IN
CONNECT
OR
PERSO
NAL
ITY
M
O
DULE
Ja
J1
BASE MOD
E
M
LEVEL
TRANSLATI
O
N
R
S
422/
V.
35/
R
S 232
SI
N G LE
E NDE
D
I/O
J8
PERSO
NALI
TY
M
O
DUL
E
TERRESTRI
AL
DATA
EI
A-
449
EI
A-
530
V.
35
MIDAS
DAC
BL
OCK DIAGRAM
(par
t of
J2)
96 PI
N
CO
NNECTO
R
to
/ fro
m
VFDU
J2
connect
or
t ype i
s
per
sonal
ity m
odul
e
dependent
REAR PANEL
(par
t of
J1)
96 PI
N
CO
NNECTO
R
to
/ fro
m
m
odem
J7
30-P
IN
HEADER to / from m
odem J7
DUA
L DI
F F E RE
NT
IA
L I
/O
DUA
L DI
F F E RE
NT
IA
L I
/O
IN
TERNAL UARTS
M
& C
ser
ial
in
te
rf ace 19.
2Kbi
ts
/s
U S E R D
A TA
/C
ON
TR
OL
DCE
, RS
232,
19.
2K
B IT /S
DUA
L DI
F F E RE
NT
IA
L
V F DU/
LI
NE
IN
T E RF
A C E
U SER
D
A T A /
CO
NT
RO
L
6–2
Figure Chapter 6-1. DAC Block Diagram