Ext Clk (J16); Async (J17); J18) - Radyne DMD20 Installation And Operation Manual

DMD20/20LBST Universal Satellite Modem
Table 5-6. ALARM Port 15-Pin Female "D" Connector (J15)
Pin No.
12 Service – NO
13 No Connection
14 AGC Out
15 Ground
Note 1: Normally open, or Normally closed, conditions indicate a faulted state or off condition.
Note 2: Prompt alarms can be configured to support a summary of a) Prompt alarms, b) Prompt
and Tx Minor alarms, or c) Prompt and Tx minor and Tx Major Alarms.
Note 3: Service alarms can be configured to support a summary of a) Service alarms, b) Service
and Rx Minor alarms, or c) Service and Rx minor and Rx Major Alarms.
Note 4: Service alarms can be configured to support the RTS Carrier Alarms. Refer to Radyne
App Note 230 for addition information on utilizing this feature as Keyline Operation.

5.5.5 EXT CLK (J16)

The External Clock Port is a 75-Ohm Female BNC Connector. It allows interfacing to an external
clock source. Input level: .5 to 5 volts Peak-to-Peak

5.5.6 ASYNC (J17)

The Asynchronous Data Interface Port is a 9-Pin Female "D" Connector. Refer to Table 5-7 for
pinouts.
Table 5-7. ASYNC Port 9-Pin Female "D" Connector (J17)
Pin No.
1 Receive Data B (RS-485)
2 Receive Data A (RS-485/-232)
3 Transmit Data A (RS-485/-232)
4 Transmit Data B (RS-485)
5 Ground
6 No Connection
7 No Connection
8 No Connection
9 No Connection

5.5.7 (J18)

Used for Comtech EF Data factory use only.
MN-DMD20-20LBST Revision 14
Signal Name
Signal Name
Signal
SP2-NO No Direction
SP2-NC No Direction
AGC No Direction
GND
Signal
RXD_B
RXD_A
TXD_A
TXD_B
GND
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Rear Panel Interfaces
Direction
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Direction
Output
Output
Input
Input
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5–10