Comtech EF Data SNM-1010L - Manual (Page 184)

SNM-1010L Data/Control Modem Revision 0
System Checkout MN/SNM1010L.OM
Table 7-1. SNM-1010L Fault Tree (Continued)
TX INTERFACE FAULTS
TX I
F
OU
TPU
T
OFF
TX FAU
LT LED
TX FAU
LT R
E
LAY
RX F
A
ULT
LED
RX F
A
ULT
RELAY
COM
EQ F
A
ULT
LED
COM
EQ F
A
ULT
RELAY
TX ALARM LED TX ALARM RELAY #2 RX ALARM LED RX ALARM RELAY #3 SPARE RELAY ALARM #1 PRIMARY ALARM RELAY SECONDARY ALARM RELAY DEF
E
RRED M
A
IN ALARM
(1) (2) (3) (4) (5) (6) (7) (8)
TX DROP Not Applicable
TX DATA/AIS X X
TX CLK PLL X X X
TX CLK ACTIVITY X X
TX AUDIO 1 CLIP Not Applicable
TX AUDIO 2 CLIP Not Applicable
RX INTERFACE FAULTS
BUFFER UNDERFLOW X X
BUFFER OVERFLOW X X
RX DATA/AIS X X
FRAME BER X X
BACKWARD ALARM Not Applicable
BUFFER CLK PLL X X
BUFFER CLK ACT X X
DEMUX LOCK X X
RX 2047 LOCK X X
BUFFER FULL X X
RX INSERT Not Applicable
RX AUDIO 1 CLIP Not Applicable
RX AUDIO 2 CLIP Not Applicable
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.
Table 7-1. SNM-1010L Fault Tree (Continued)
7–4