RAD Data comm RSD-20 APPENDIX A

APPENDIX A

Table A.1

X21 Interface Signal Description

X.21 SIGNAL NAME PIN

SHIELD 1

G GROUND 8

T TRANSMIT 2

R RECEIVE 4

CCONTROL3

I INDICATION 5

S SIGNAL TIMING 6

- EXTERNALCLOCK 7

Contents

Main RSD-20 High Speed Digital Sharing Device Installation and Operation Manual Notice :DUUDQW\ /LPLWDWLRQRI:DUUDQW\ ([FOXVLYH5HPHGLHV 5HJXODWRU\,QIRUPDWLRQ )&&8VHU,QIRUPDWLRQ Page 'HFODUDWLRQRI&RQIRUPLW\ TABLE OF CONTENTS INTRODUCTION 1.1 1.2 1.3 1.4 INSTALLATION 2.1 2.2 2.3 2.4 2.4.2 Rear Panel 2.4.3 Internal Switches and Strap Selection Page Page 2.5 2.5.1 RSD-20/V.35 TX. CLK RSD-20 DCE INT. CK DCE EXT. CK DTE RSD-20 RSD-20 2.5.2 RSD-20/X.21 Page OPERATION 3.1 RAD 3.2 3.3 3.3.1 Power Turn On 3.3.2 Operation 3.3.3 Power Turn Off 3.4 3.5 3.5.1 Power Supply 3.5.2 RSD Malfunction THEORY OF OPERATION AND APPLICATIONS 4.1 4.2 4.3 4.3.1 Manual Disable 4.4 4.4.1 Main Channel Control Signals 4.4.2 Sub-channel Control Signals Page Page Page Page 4.5 APPENDIX A Table A.1 X21 Interface Signal Description APPENDIX B Table B.1 V.35 Interface Signal Description