Specifications

OM20 Universal Outdoor Modem Rear Panel Interfaces
MN-OM20– Revision 5 5–5
5.1.3 EIA-530 Synchronous Data, ES-ES Asynchronous Overhead Data, and G.703
Balanced Data I/O Port (J3)
This 38 Pin D38999/24FD35PN Connector contains the EIA-530 data connections (RS-
422/V.35/RS-232, the ES-ES RS485 Asynchronous Overhead data interface, the G.703 Balanced
interface, and the Open Collector Modulator and Demodulator Faults. Cable lengths up to 60
meters can be used depending on data rate, interface type, and temperature de-rating. Refer to
Table 5.4 for pin-outs.
Table 5.4. EIA-530 Synchronous Data I/O; ES-ES Async Data Connector (J3)
J3
Pin No.
Signal Name Signal Direction EIA-530 Std.
25 Pin
Connector
Reference
1 Shield--- --- 1
2 Send Data B (+) SD-B Input 14
3 Send Data A (-) SD-A Input 2
4 Send Timing A (-) ST-A Output 15
5 Receive Data RD-A Output 3
6 Receive Data B (+) RD-B Output 16
7 Request To Send A (-) RS-A Input 4
8 Receive Timing A (-) RT-A Output 17
9 Clear To Send A (-) CS-A Output 5
10 Modulator Fault – Open Collector MF Output 18
11 Data Mode A (-) DM-A Output 6
12 Request To Send B (+) RS-B Input 19
13 Signal Ground SGND --- 7
14 Data Terminal Ready A (-) TR-A Input 20
15 Receiver Ready A (-) RR-A Output 8
16 Demodulator Fault DF Output 21
17 Receive Timing B (+) RT-B Output 9
18 Data Mode B (+) DM-B Output 22
19 Receiver Ready B (+) RR-B Output 10
20 Data Terminal Ready B (+) TR-B Input 23
21 Terminal Timing B (+) TT-B Input 11
22 Terminal Timing TT-A Input 14