beautypg.com

Comtech EF Data SNM-1002 User Manual

Page 117

background image

SNM-1002 LinkSync

 Modem

Revision 2

Maintenance

MN/SNM1002.OM

5–9

Table 5-2. SNM-1002 Fault Tree












MODULATOR FAULTS

TX IF OUTPUT OFF

TX

FA

U

LT LED

TX

FA

U

LT RELA

Y

RX

FA

U

LT LED

RX

FA

U

LT RELA

Y

CO

M EQ

FA

U

LT LED

CO

M EQ

FA

U

LT RELA

Y

TX

A

L

A

RM LED

T

X

AL

ARM RE

L

AY #2

RX ALARM LED

RX AL

ARM RE

L

AY #3

SPARE

AL

ARM RE

L

AY #1

PRIMARY AL

ARM RE

L

AY

SE

CONDARY AL

ARM RE

L

AY

DEFERRED MAIN ALARM

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

IF SYNTHESIZER

X

X

X

DATA

CLOCK

SYN

X

X

X

I

CHANNEL

X

X

X

Q

CHANNEL

X

X

X

AGC

X

X

X

MODEM REF ACT

X

X

MODEM REF PLL

X

X

X

MODULE

X

X

X

CONFIGURATION

X

X

X

DEMODULATOR FAULTS

CARRIER

DETECT

X

X

IF SYNTHESIZER

X

X

I

CHANNEL

X

X

Q

CHANNEL

X

X

BER THRESHOLD

X

X

MODULE

X

X

CONFIGURATION

X

X

Legend

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.O. contacts indicate no fault/alarm.

**

Signal is open collector high impedance if faulted.