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OM20 Universal Outdoor Modem
5.0.3 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.
1
Shield--- ---
2
Send Data B (+)
3
Send Data A (-)
4
Send Timing A (-)
5
Receive Data
6
Receive Data B (+)
7
Request To Send A (-)
8
Receive Timing A (-)
9
Clear To Send A (-)
10
Modulator Fault – Open Collector
11
Data Mode A (-)
12
Request To Send B (+)
13
Signal Ground
14
Data Terminal Ready A (-)
15
Receiver Ready A (-)
16
Demodulator Fault
17
Receive Timing B (+)
18
Data Mode B (+)
19
Receiver Ready B (+)
20
Data Terminal Ready B (+)
21
Terminal Timing B (+)
22
Terminal Timing
23
Send Timing B (+)
24
No Connect
25
Clear To Send B (+)
TM116 – Rev. 1.2
Signal Name
Rear Panel Interfaces
Signal
Direction
SD-B
Input
SD-A
Input
ST-A
Output
RD-A
Output
RD-B
Output
RS-A
Input
RT-A
Output
CS-A
Output
MF
Output
DM-A
Output
RS-B
Input
SGND
---
TR-A
Input
RR-A
Output
DF
Output
RT-B
Output
DM-B
Output
RR-B
Output
TR-B
Input
TT-B
Input
TT-A
Input
ST-B
Output
---
---
CS-B
Output
EIA-530 Std.
25 Pin
Connector
Reference
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
14
12
25
13
5-5
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