Operating instructions

DMD20/DMD20 LBST Universal Satellite Modem Rear Panel Interfaces
TM103 – Rev. 2.8 5-27
5.12.2 8K DATA (J3)
The 8K Data Port allows for communications between Earth Stations. It is a 15-Pin Female “D”
Connector that complies with IESS 308. Refer to Table 5-16 for pinouts.
Table 5-16. 8K DATA Port 15-Pin Female “D” Connector (J3)
Pin No. Signal Name Signal Direction
1 Receive Octet-B ESCRXO-B Output
2 Receive Clock-B ESCRXC-B Output
3 Receive Data-B ESCRXD-B Output
4 No Connection NC ---
5 No Connection NC ---
6 Transmit Data-A ESCTXD-A Input
7 Transmit Clock-A ESCTXC-A Output
8 Transmit Octet-A ESCTXO-A Output
9 Receive Octet-A ESCRXO-A Output
10 Receive Clock-A ESCRXC-A Output
11 Receive Data-A ESCRXD-A Output
12 Ground GND ---
13 Transmit Data-B ESCTXD-B Input
14 Transmit Clock-B ESCTXC-B Output
15 Transmit Octet-B ESCTXO-B Output
5.12.3 G.703 BAL (J4)
The G.703 Interface Port (Balanced) is a 15-Pin Female “D” Connector. Refer to Table 5-17 for
pinouts.
Table 5-17. G.703 BAL Port 15-Pin Female “D” Connector (J4)
Pin No. Signal Name Signal Direction
1 Send Data (-) SD-A Input
2 Ground GND ---
3 Receive Data A (-) RD-A Output
4 Ground GND ---
5 Drop Data Out (+) DDO-B Output
6 Insert Data In (+) EXC (+) IDI-B Input
7 External Clock A (-) BAL EXC-A Input
8 External Clock B (+) BAL EXC-B Input
9 Send Data (+) SD-B Input