RAD Data comm ASM-20 Table A-3 IR-ETH Bridge LED Indicators, Description Location Color Name

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ASM-20Installation and Operation ManualAppendix A. Ethernet Interface

Table A-3 IR-ETH Bridge LED Indicators

LED	Description	Location	Color
Name

LINK	ON indicates good link integrity (available only	Panel	Green
	in the 10BaseT version)

COLL	ON indicates collision on the attached Ethernet	Panel	Yellow
	segment

RX	ON when data is received from the Ethernet	Panel	Yellow
	attached segment

TX	ON when data is transmitted from the modem	Panel	Yellow
	to the Ethernet segment

ERR D4 Bridge buffer overrun		On board	Red

Installation and Operation

A-5

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Contents ASM-20 RAD data communications Headquarters US East US WestPage Warranty Safety Warnings Ports Safety StatusRegulatory Information Safety Supplementary InformationInstalling and Operating ASM-20 Adjust the jumpers. See , Installation and SetupQuick-Start Guide INT or EXT and the other modem RCV LBTPreface Conventions Contents Troubleshooting and Diagnostics List of Figures List of Tables Overview Chapter IntroductionApplications DTE interface Following DTE interface options are availablePhysical Description Front PanelCDD conditional diphase modulation technique Functional DescriptionAsync to Sync Converter Unloaded twisted pair 19 to 26 AWG Technical SpecificationsRange See Table Level Digital Interface Diagnostics Timing ElementsPower Red Bit errors Err YellowPower Supply 115 or 230 V 10% 47 to 63 Hz 5W Weight 290 gm / 10.1 ozApproximate Range Baud 19 AWG 22 AWG 24 AWG 26 AWG RateIntroduction Technical Specifications Introduction Chapter Installation and SetupSite Preparation and Prerequisites Mechanical Installation Package ContentsElectrical Installation Strap Selection Setting Internal Jumpers Switches ASM-20 X.21 Rear PanelPCB Layout Diagram X.21, one of the modems should be set to RCV clockASM-20 Strap Selection Settings Jumper Function Possible Factory Switch Identity SettingsStart Bit Data Bits Parity Stop Bit No. of Bits Power Connection Installation and Setup Electrical Installation Controls and Indicators Chapter OperationGeneral ASM-20Control and Indicator Functions Name Type FunctionPower On Procedure Operating InstructionsPower Off Activation of Tests Operational Jumper Switch ChangesProcedure Chapter Troubleshooting Diagnostics Frequently Asked QuestionsDifferences in Versions ASM-20 ASM-20-2Loop Tests Procedure Bit Error Rate Tester BertBert Using Loops Modem Self Test Local Test Analog LoopbackCommunication Link Tests Remote Digital LoopbackLocal Digital Loopback Remote ASM-20 in Digital LoopbackChapter Card Cage Version ASM-MN-214 Card CageASM-20/R Card Version ASM-MN-214 Rear PanelPower Supply AC Supply 100, 115 or 230 VAC DC Supply -48 VDCPower Supply with Redundancy ASM-MN-214 Front PanelInstallation Card Cage Version Installation Appendix a Ethernet Interface DescriptionIR-ETH Connector Options Signal Pin DB-25 RJ-45Installation and Operation Ethernet Bridge SpecificationsGeneral Other devices do not OptionTable A-3 IR-ETH Bridge LED Indicators Description Location Color NameAppendix A. Ethernet Interface Installation and Operation Appendix B IR-G.703 Codirectional Interface 64 kbps General DescriptionEXT Mode Figure B-2 Location of JP1 on the IR-G.703 Interface ModuleModem B INT/RCV ModeOdem a Odem B Page Appendix C IR-X.21B Interface Module Figure C-1 Typical ASM-20 X.21 ApplicationInterface module $87,21 25&21,18 Table C-1 IR-X.21B DB-15 RS-422 Connector Pin AssignmentPin Function IR-X.21B Interface Module PositionFigure C-4 EXT Mode Timing Block Appendix D DTE Interface Connectors Pin Circuit FunctionRTS Signal General 13/4/99 Appendix E Connection to RS-422 Signal Function RS-449 RS-422/423 EIA PinsPin Circuit Appendix E. Connection to RS-422 Appendix F Unit Case Assembly Installation of the Unit Case into a 19 RackInstallation of a Single Unit Unit CaseInstallation of Two Units Figure F-1 Installation of a Single UnitAppendix F. Unit Case Assembly Figure F-3 Installation of Two Units