Comtech EF Data SMS-301 - Manual (Page 106)

SDM-2020 System Installation SMS-301 Redundancy Switch
C–4 Rev. 3
C.1.2 Connect to SDM-2020 Satellite Modulator with EIA-422 Interface
Note: The section defines the requirements of the EIA-422 data interface for video and
high-speed data applications used with the SDM-2020 Satellite Modulator. This interface
uses serial format only.
C.1.2.1 Description
The SMS-301 data interface is a plug-in module that interfaces with the SDM-2020
Satellite Modulator. The interface used EIA-530 serial format. Specifications are as
referenced herein:
•
EIA-422, Electrical Characteristics of Balanced Voltage Digital Interface
Circuits
•
EIA-530, High-Speed 25-Position Interface for data Circuit – Terminating
Equipment
The interface operates to the specifications described in Table C-1.
Table C-2. EIA-422/EIA-530 Specifications
General Specification
Interface Type EIA-422/EIA-530 Synchronous (Serial)
Data Rate 1.5 to 18 Mbit/s (Serial)
Connectors 37-pin D female for serial data
Electrical Properties Per EIA-422
Signal Types SD, ST, TT, RS, CS, RD, RT, RR, (CD)