Comtech EF Data SNM-1000 - Manual (Page 120)

SNM-1000 Node Control Modem Revision 3
Theory of Operation MN/SNM1000.IOM
4–2
US
E
R
PO
R
T
PER
SO
N
A
L
IT
Y
MO
D
U
L
E
U
SER
D
A
T A
/
CO
NT
R
O
L
U
SER D
A
T A /C
O
N
T R
O
L
D
C
E
, R
S 23
2,
19
.2
K b it /s
US
E
R DA
T A
/C
O
N
T
R
O
L
D
C E
, R
S
2
3 2 , 19.
2K
bit/
s
Jb
US
E
R
/D
A
T
A
PO
R
T
9P
IN
M
ini
D
IN
CO
N
N
E
C
T
O
R
J8
803
86
50
M
H
Z
CP
U
CLK
J2
J6
10 PI
N
H
E
AD
ER
C
A
BL
E
D
T
O
/ F
R
OM
DB
9
RE
A
R
P
A
NE
L
EF
B
U
S1
2 w
ir
e RS
4 8 5 , up
to
1 1 5K
bit/
S
EF
BU
S
1
2 w
ir e RS
485,
up
to 1
1 5K
b it/S
QU
A
D
UA
R
T
(one h
a
lf
of
16C
5
54)
RS
23
2
L
EVEL
T
R
AN
S-
LA
TI
O
N
QUA
D
UA
R
T
(one h
a
lf o
f
16C
554)
RS
48
5
LE
VEL
TRANS
L
A
T
ION
(part of J1)
96 PIN
CO
NN
E
C
T
O
R
to / from modem
IN
TE
RNA
L
UA
R
T
S
HD
L
C
CON
T
RO
L
L
E
R
(o
n hal
f
of
Z
8
5230
M & C
s
e
ri
a
l i
n
te
rf
ac
e 19
.2K
b
it
/s
SE
GME
N
T
E
D
FL
AS
H
51
2k
BY
T
E
S
DR
A
M
512K by
tes
NO
N-
VO
LA
T
ILE
RA
M
2K
x
8
HD
LC
CO
NTRO
L
L
E
R
(one
hal
f of
Z
852
30)
RS
2
3
2
LE
VEL
T
R
AN
SL
A
T
IO
N
H
D
LC
R
S
232
J5
10 PI
N
H
EAD
E
R
D
E
BU
GG
ER
TE
ST
PO
R
T
J1
(pa
rt of
J
1
)
96
P
IN
CO
NN
E
C
T
O
R
TO
/
F
R
O
M
MO
DE
M
TX
C
O
NT
RO
L
TX
CO
NTR
O
L
RX
CO
NTRO
L
RX
D
A
T
A
TX
DA
T
A
Figure 4-1. DAC Block Diagram