3-2
External Connections
EIA RS-449 Electrical Specifications
The EIA RS-449 electrical specifications are shown in Table 3-2 for differential
(RS-422) and single-ended (RS-423) drivers and receivers.
The differential pair has a true signal, indicated by a B, and an inverted signal,
indicated by an A. These two differential signals must always be opposite in
polarity. With no line attenuation, each signal should be within ±1.5 V of the
nominal level, which is approximately 2.5 V above signal ground. Driver and
receiver impedance are included for reference only.
The CM601 data connector is pinned out as data communications equipment
(DCE); therefore, the user data equipment must be configured as data terminal
equipment (DTE) in order to make a straight cable between them.
Table 3-2
Electrical Specifications for Differential (RS-442) and Single-Ended
(RS-423) Drivers and Receivers
Driver
Specifications
Differential Driver
(Output)
B – true signal, 0 or 5 V
A – inverted signal, 5 or 0 V
Less than 100 ohms between A and B
Single-Ended Driver
(Output)
Greater than +3 V or less than -3 V with respect to signal ground
Less than 50 ohms with respect to signal ground
Differential Receiver
(Input)
B – true signal, 0 or 5 V
A – inverted signal, 5 or 0 V
100 ohms between A and B
Single-Ended Receiver
(Input)
Greater than +3 V or less than -3 V with respect to signal ground
Minimum 4 kohms signal to ground
Содержание CM601
Страница 4: ...iv Notice COMSTREAM A Spar Company...
Страница 12: ...xii Contents COMSTREAM A Spar Company...
Страница 86: ...6 14 Front Panel Operation COMSTREAM A Spar Company...
Страница 96: ...7 10 Configuration Examples COMSTREAM A Spar Company...
Страница 118: ...8 22 Fault Handling Troubleshooting and Maintenance COMSTREAM A Spar Company...
Страница 124: ...A 6 Technical Specifications COMSTREAM A Spar Company...
Страница 160: ...xii Safety Precautions 01 0799 401D 08 02...
Страница 164: ...4 Functional Description 01 0799 401D 08 02...
Страница 170: ...10 Card Removal Procedure 01 0799 401D 08 02...
Страница 204: ...44 Fault and Status Queries 01 0799 401D 08 02...
Страница 208: ...48 Loopback Tests 01 0799 401D 08 02...
Страница 216: ...56 Appendix A Technical Specifications and Pinouts 01 0799 401D 08 02...
Страница 220: ...60 01 0799 401D 08 02...
Страница 222: ...D 08 02 01 0799 401 Index 62...
Страница 223: ...01 0922 401 Rev A 4 03 1 Application Note Carrier Acquisition and Optimization CM601 CM701 Satellite Modem v1 80 1 84...