Electrical Interfaces
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
5-12
TM075 – Rev. 1.3
5.4.8 CLOCK (J8)
The External Clock Port (J8) is used for injecting an external data clock into the modem. The
data symbol clocks may then be selected to be locked to this source. The external clock must
meet the following requirements:
Frequency:
9600 Hz to 2.048 MHz
Amplitude:
0.2 Vp-p to 5 Vp-p
Type:
Sinewave or Squarewave
5.4.9 G.703 BAL (J8)
The G.703 Balanced Port (J8) are the G.703 balanced data connectors. It is a 15-Pin Female
“D” Connector. Refer to Table 5-10 for connector pinouts.
Table 5-10. G.703 BAL - 15-Pin Connector (J10)
Pin Number
Signal
Description
Direction
1
SD-A
Send Data A (-)
Input
2
GND
Ground
–
9
SD-B
Send Data B (+)
Input
7
BAL EXC-A
External Clock A (-)
Input
8
BAL EXC-B
External Clock B (+)
Input
3
RD-A
Receive Data A (-)
Output
4
GND
Ground
–
11
RD-B
Receive Data B (+)
Output
12
DDO-A
Drop Data Out A (-)
Output
5
DDO-B
Drop Data Out B (+)
Output
13
IDI-A
Insert Data In A (-)
Input
6
IDI-B
Insert Data In B (+)
Input
14
MOD FLT
Mod Fault – Open Collector
Output
15
DMD FLT
Demod Fault – Open Collector
Output
5.4.10 SD (J9)
The Send Data Port (J9) is the unbalanced Send Data BNC Connector.
5.4.11 RD (J10)
The Receive Data Port (J10) is the unbalanced Receive Data BNC Connector.
5.4.12 TX DC VOLTAGE INDICATOR
The Transmit DC Voltage Indicator shows if there is DC Voltage present at J2.