Comtech EF Data SDM-2020 - Manual (Page 39)

SDM-2020 Satellite Modulator Revision 7
External Connections MN/SDM2020M.IOM
4-3
4.1.2 F
AULT
C
ONNECTOR
(J2)
The fault interface connection is a 9-pin female D connector located on the rear panel of the
modulator. Screw locks are provided for mechanical security on the mating connector.
The fault connector provides FORM-C contact closures for fault reporting. The two
FORM-C summary fault contacts are Modulator and Common Equipment. To obtain a
system summary fault, connect all of the FORM-C contacts in parallel.
Table 4-3. Faults Status Relays Connector Pinout (J2)
Pins Connected
Signal
Function Name Pin # Type
Fault/
Alarm OK
Power
OFF
Common Equipment Fault CE_NO
CE_COM
CE_NC
1
2
3 FC
FC
FC
2-3 1-2 2-3
Modulator Fault MOD_NO
MOD_COM
MOD_NC
4
5
6 FC
FC
FC
5-6 4-5 5-6
Modulator Alarm ALM_NO
ALM _COM
ALM _NC
7
8
9 FC
FC
FC
7-8 8-9 8-9
Note: A connection between the common (COM) and normally open (NO) contacts
indicates no fault.
4.1.3 T
RANSMIT
IF O
UTPUT
C
ONNECTOR
(CP1)
CP1 is a BNC connector for the TX IF signal output. The output impedance is 75 Ω
(50 Ω optional). The output is a modulated carrier between 50 and 180 MHz.
4.1.4 AC P
OWER
This unit shall be operated from the type of power source indicated on
the marking label. If power source is unknown, contact the local power
company. Damage to the unit may be the result.