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Comtech EF Data SNM-1001L User Manual

Page 328

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SNM-1001L Satellite Modem

Revision 1

Burst Mode Modulator Operation

MN/SNM1001L.OM

C–14
















TX INTERFACE

FAULTS

T
X

I

F

O
U

T
P

U

T

O

F
F

T
X

F
A

U

L
T

L

E
D

T
X

F
A

U

L
T

R
E

L

A
Y

R
X

F
A

U

L
T

L

E
D

R
X

F
A

U

L
T

R
E

L

A
Y

C
O

M

E

Q

F
A

U

L
T

L

E
D

C
O

M

E

Q

F
A

U

L
T

R
E

L

A
Y

T
X

A

L

A
R

M

L

E
D

T
X

A

L

A
R

M

R
E

L

A
Y

#
2

R
X

A

L

A
R

M

L

E
D

R
X

A

L

A
R

M

R
E

L

A
Y

#
3

S
P
A
R
E

R
E

L

A
Y

A

L

A
R

M

#
1

(1)

(2)

(3)

(4)

(5)

TX CLK PLL

X

X

X

TX

CLK

ACTIVITY

X

X

Legend

Test Note

Fault/Alarm Relay

Test Points Connector/Pins

1

TX FAULT

Pin 4 (NO), 5 (COM), 6 (NC) ****

2

RX FAULT

Pin 7 (NO), 8 (COM), 9 (NC) ****

3

COM EQ FAULT

Pin 1 (NO), 2 (COM), 3 (NC) ****

4

TX ALARM #2

Pin 4 (NO), 5 (COM), 6 (NC) +

5

RX ALARM #3

Pin 7 (NO), 8 (COM), 9 (NC) +

6

PRIMARY ALARM

Pin 43 (NO), 10 (COM), 27 (NC) +

7

SECONDARY ALARM

Pin 44 (NO), 11 (COM), 28 (NC) +

8

DEF MAINT ALARM

Pin 17 *****

****

A connection between the common and N.C. contacts indicate fault.

*****

Signal is open collector high impedance if faulted.

+

A connection between the common and N.O. contacts indicate alarm.

Figure C-1. SNM-1001L Burst Mode Fault Tree (Continued)