Black Box LDM-144LR Specifications

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9CHAPTER 1: SpecificationsTable 1-1. Maximum Transmission Distance.SPEED 19 AWG 24 AWG 26 AWG(bps)19,200 6 mi. (9.8 km) 4 mi. (6.5 km) 2.7 mi. (4.4 km

10LDM-MR19.22. IntroductionThe 19.2 kbps RS-232 Line Driver (LDM-MR19.2 for short) is a short-range modem which operates at full- or half-duplex with

11CHAPTER 2: Introduction2.1 Functional DescriptionThis section contains functional descriptions of the LDM-MR19.2’s circuit blocks(primarily the circ

12LDM-MR19.22.1.3 ASYNC-TO-SYNCCONVERTERThe LDM-MR19.2 provides internal conversion from async to sync in compliancewith CCITT V.22 bis. According to

13CHAPTER 2: Introduction2.1.5 RECEIVERThe receiver contains several circuits (shown in Figure 2-1 below):• The RECEIVE FILTER removes all the out-of-

14LDM-MR19.2However, there is a difference in multipoint applications, where the mastermodem communicates with modems at different distances. When the

15CHAPTER 2: Introduction2.1.6 V.54 DIAGNOSTICSYou can activate V.54 loops with either the front-panel pushbuttons or Pins 18 and 21 of the V.24/ RS-2

16LDM-MR19.2Figure 2-2. Point-to-point application.Figure 2-3. Multipoint application.A/S 400LDM-MR19.2 LDM-MR19.2LDM-MR19.2LDM-MR19.2LDM-MR19.2SLAVE

17CHAPTER 2: IntroductionFigure 2-4. Tail circuit for DDS application.Figure 2-4. Star application.AS/400AS/400ControllerControllerControllerLDM-MR19.

18LDM-MR19.23. Standalone InstallationFollow the directions in this chapter to install the standalone version of theLDM-MR19.2. Once you’ve done this,

1FCC AND IC STATEMENTSFEDERAL COMMUNICATIONS COMMISSIONANDINDUSTRY CANADARADIO FREQUENCY INTERFERENCE STATEMENTSThis equipment generates, uses, and ca

19CHAPTER 3: Standalone InstallationThe terminal block holds five crimp-style contact positions for connecting theTransmit (XMT) and Receive (RCV) tel

20LDM-MR19.2Table 3-1. DB25 Pinout and Interface-Signal List (continued)CCITT EIA DTE SIGNALV.24 RS-232-C PIN NAME DESCRIPTION109 CF 8 Receive Line Th

21CHAPTER 3: Standalone Installation3.4 Setting the Internal ControlsAfter you install the cabling, you’ll need to configure the LDM-MR19.2 for yourap

22LDM-MR19.2Table 3-2. Strap Selection, Standalone VersionStrap Identity Function Possible Standard Settings Factory SettingsNo. 1 Determines the data

23CHAPTER 3: Standalone InstallationTable 3-2. Strap Selection, Standalone Version (continued)Strap Identity Function Possible Standard Settings Facto

24LDM-MR19.2Table 3-3. Async Character-Length SettingStart Bit Data Bits Parity Stop Bit(s) Total BitsAlways 1 5 NONE 2 8ODD OR EVEN 1 or 1.5 8296 NON

25CHAPTER 3: Standalone InstallationFigure 3-2. The standalone LDM-MR19.2’s board layout.

26LDM-MR19.24. Card InstallationThe ME760C is a card version of the LDM-MR19.2 that can be easily installed inour RackNest 2/14. Its front-panel indic

27CHAPTER 4: Card Installation4.2 The RackNest 2/14’s Power SupplyThe 115-VAC RackNest 2/14 (our product code RM110A) uses the PS1000A powersupply, wh

28LDM-MR19.24.3 The RackNest 2/14 IllustratedYou will be installing the LDM-MR19.2 card in the RackNest 2/14 as shown inFigure 4-1 below. The front an

2LDM-MR19.2NORMAS OFICIALES MEXICANAS (NOM)ELECTRICAL SAFETY STATEMENTINSTRUCCIONES DE SEGURIDAD1. Todas las instrucciones de seguridad y operación de

29CHAPTER 4: Card InstallationFigure 4-2. The RackNest 2/14 illustrated.GNDRCVXMITON1725346

30LDM-MR19.2Table 4-1. Descriptions of RackNest 2/14 ComponentsItem Control, Indicator, or Connector Function1 Card Slots Slots for installation of co

31CHAPTER 4: Card Installation4.4 Card-Configuration ProcedureBefore putting the LDM-19.2 card in the RackNest 2/14 or attaching anything tothe Card,

32LDM-MR19.2Table 4-2. Strap Selection, Card VersionStrap Identity Function Possible Standard Settings Factory SettingsNo. 1 Determines the data rate.

33CHAPTER 4: Card InstallationTable 4-2. Strap Selection, Card Version (continued)Strap Identity Function Possible Standard Settings Factory SettingsN

34LDM-MR19.2Figure 4-3. The LDM-MR19.2 card’s board layout.

35CHAPTER 4: Card Installation4.5 Card-Installation ProcedureAfter you install the RackNest 2/14 in your 19” rack (refer to the Nest’s manual),take th

36LDM-MR19.25. OperationThis chapter describes the LDM-19.2’s controls and indicators, operatingprocedures, and strapping information. Be sure you fin

37CHAPTER 5: OperationFigure 5-2. The LDM-MR19.2 card’s front panel.123457A6BCD

38LDM-MR19.2Table 5-1. ControlsITEM CONTROL FUNCTIONA DIG Pressng the Digital Loopback button causes the local LDM-MR19.2 to loop received data and cl

3NOM STATEMENT10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calorcomo radiadores, registros de calor, estufas u otros apar

39CHAPTER 5: Operation5.2 Turning the Unit ONIf you haven’t already, plug the AC power cord of the LDM-MR19.2 itself (forstandalone units) or the Rack

40LDM-MR19.2The card’s RPF circuitry will detect this tone, light the card’s RPF LED, and stopthe card from making any further attempts to communicate

41CHAPTER 6: Troubleshooting6. TroubleshootingThis chapter contains information about how to test your system, how to isolatefaults, and what to do wh

42LDM-MR19.2Figure 6-1. A local LDM-MR19.2 in analog loopback.6.1.2 COMMUNICATION-LINKTESTS: DIGITALLOOPBACK6.1.2.A Remote Digital LoopbackUse the Rem

43CHAPTER 6: TroubleshootingFigure 6-2. A remote LDM-MR19.2 in digital loopback.Figure 6-3. A local LDM-MR19.2 in digital loopback.RCVRDATACLKDIGPRESS

44LDM-MR19.26.2 Calling Black BoxIf you determine that your LDM-MR19.2 is malfunctioning, do not attempt to alter or repair the unit. It contains no u

NOTES

NOTES

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4LDM-MR19.2TRADEMARK USED IN THIS MANUALAS/400 is a registered trademark of International Business Machines Corporation.Any other trademarks mentioned

5TABLE OF CONTENTSContentsChapter Page1. Specifications ...

6LDM-MR19.21. SpecificationsCompliance — FCC Part 15 Subpart J Class A, DOC Class/MDC classe ACable Required — Between ME760 units: Unloaded twisted p

7CHAPTER 1: SpecificationsCarrier — Controlled by RTS or constantly ON (user-selectable)Maximum TransmissionDistance — See Table 1-1 on page 11User Co

8LDM-MR19.2Indicators — (6 or 7) Front-mounted LEDs: PWR (power), RTS, TD,RD, DCD, TEST, and (ME760C only) RPF (remotepower failure)Connectors — (2) R