Black Box ME265C Specifications

CUSTOMERSUPPORTINFORMATIONOrder toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOXFREE technical support, 24 hours a day,

9CHAPTER 2: Introduction2. Introduction2.1 Functional DescriptionThe Modular Modem Eliminator is a universal interface converter that can be used to i

10MODULAR MODEM ELIMINATORGeneral-Purpose Interface ModulesThe general-purpose interface modules are:• RS-232 Module (part number ME261C), EIA RS-232

11CHAPTER 2: Introduction2.2.3 OPERATINGMODESThe Modular Modem Eliminator has three operating modes, which are describedbelow.Interface-Converter Mode

12MODULAR MODEM ELIMINATOR2.2.4 TIMINGOPTIONS FOR THEINTERFACEMODULESThe timing options offered by the Modular Modem Eliminator depend on two factors:

13CHAPTER 2: Introduction• DTE—the interface module accepts clock signals for the receive and transmitpaths. Note that for the X.21 interface, the mod

14MODULAR MODEM ELIMINATOR2.2.5 ITU G.703 64-KBPSCO-DIRECTIONALINTERFACEMODULE(ME266C)The 64-kbps co-directional interface specified by ITU G.703 incl

15CHAPTER 2: Specifications• LBT—the transmit clock is locked to the recovered receive clock (this mode is called “loopback timing”). Figure 2-4 shows

16MODULAR MODEM ELIMINATOR2.2.6 ITU 1.544- AND2.048-MBPSINTERFACEMODULES(ME268CANDME267C)The ITU G.703 1.544-Mbps and 2.048-Mbps interface modules hav

17CHAPTER 2: Introduction2.2.7 GENERALCHARACTERISTICSThe Modular Modem Eliminator is a compact unit, intended for installation on adesktop or shelf. A

18MODULAR MODEM ELIMINATOR2.3 ApplicationsThis section provides a description of the functions performed by the ModularModem Eliminator. For illustrat

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

19CHAPTER 2: Introduction• Connection of a DTE to a 64 kbps co-directional G.703 1.544 Mbps or G.7031.048 Mbps network or DTE. In a typical applicatio

20MODULAR MODEM ELIMINATOR2.3.2 INTERFACING BYGENERAL-PURPOSEMODULESFigure 2-8 shows a typical interface signals flow diagram for an interface convert

21CHAPTER 2: Introduction2.3.3 INTERFACING WITH64-KBPSCO-DIRECTIONALINTERFACEMODULE(ME266C)Figure 2-9 shows a typical interface-signal flow diagram fo

22MODULAR MODEM ELIMINATOR2.3.4 INTERFACING WITHT1 ORE1 INTERFACEMODULEFigure 2-10 shows a typical interface-signal flow diagram for an interface conv

23CHAPTER 2: Introduction2.3.5 MODEM-ELIMINATORAPPLICATIONSIn modem-eliminator applications, the Modular Modem Eliminator is used as areplacement for

24MODULAR MODEM ELIMINATORTiming ModesWhen set for operation in the modem eliminator configuration, the ModularModem Eliminator offers two timing mode

25CHAPTER 2: IntroductionFigure 2-13 shows the flow of the clock signals in this mode, as well as the flow of interface control signals.Figure 2-13. M

26MODULAR MODEM ELIMINATOR2.4 Elastic-Buffer ApplicationsIn a typical elastic-buffer application, the Modular Modem Eliminator connectstwo DCEs that o

27CHAPTER 2: IntroductionsFigure 2-15. Elastic buffer application (data, check, and interface control signals diagram).Internal ClockJ1J2DTE ModeDTE M

28MODULAR MODEM ELIMINATOR3. Installation3.1 GeneralThe Modular Modem Eliminator is designed for installation as a desktop unit,however, a rackmount k

2MODULAR MODEM ELIMINATORNORMAS OFICIALES MEXICANAS (NOM)ELECTRICAL SAFETY STATEMENTINSTRUCCIONES DE SEGURIDAD1. Todas las instrucciones de seguridad

29CHAPTER 3: Installation3.2 Configuration Information3.2.1 GENERALBefore installing the Modem Eliminator, set the internal jumpers as explainedbelow.

30MODULAR MODEM ELIMINATOR3.3.3 JUMPERLOCATION ANDFUNCTIONSModular Modem Eliminator jumpers are identified in Figure 3-2.Figure 3-2. Jumpers.CHASSIS

31CHAPTER 3: InstallationNOTEThe functions of all the following jumpers are used only in the ME(modem eliminator) mode.CARRIER-2, JP5 (ME mode only)•

32MODULAR MODEM ELIMINATOR3.2.4 SETTING THEJUMPERSCAUTIONDisconnect the unit from the power line before removing cover. Avoidadjusting, maintaining, a

33CHAPTER 3: InstallationFigure 3-4. G.703 interface modules.XMT TIMINGINT CLKEX CLKLBT CLKXMT TIMINGINT CLKEX CLKLBT CLKRATEXMT TIMING64 kbps128 kbps

34MODULAR MODEM ELIMINATOR3.3 Configuring Interface Modules3.3.1 GENERAL-PURPOSEINTERFACEMODULESEach general-purpose interface module has a DTE/DCE se

35CHAPTER 3: Installation3.4 Installing Interface ModulesAs shown in Figure 3-5, the interface modules are held in place by two rails and arefastened

36MODULAR MODEM ELIMINATOR3.5 Connecting the Cables3.5.1 CONNECTORLOCATIONFigure 3-6 identifies the connectors located on the rear panel of the Modula

37CHAPTER 3: Installation3.5.4 GROUNDINGAny interruption of the protective (grounding) conductor (inside or outside the instrument) or disconnecting t

38MODULAR MODEM ELIMINATOR4. Operation4.1 Front Panel Control and IndicatorsFigure 4-1. Front Panel.Table 4-1 lists the functions of the indicators an

3NOM STATEMENT12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarizacióndel equipo no sea eliminada.13. Los cables de la fuen

39Table 4-1 (continued). Controls and indicators.No. Control or Indicator Function6, 7, 8 MODE indicators The indicator corresponding to the selectedo

40MODULAR MODEM ELIMINATOR5. Troubleshooting5.1 Things To TryIn case a problem occurs, perform the following checks:• Check that the PWR indicator lig

41CHAPTER 5: Troubleshooting5.3 Shipping and PackagingIf you need to transport or ship your Modular Modem Eliminator:• Package it carefully. We recomm

42MODULAR MODEM ELIMINATORAppendix A: Interface DataA.1 General-Purpose ModulesTable A-1 lists the line functions in the interface connectors of the M

43Table A-1 (continued). Plug-in module’s interface connectors (line functions).Description Abbr. Direction EIA ITU V.35 V.36 ITU X.21of Signal RS-232

44MODULAR MODEM ELIMINATORA.2 ITU G.703 Balanced Interface ModulesThe G.703 balanced interface modules have a 15-pin D-type female connector,wired as

45Appendix B: Calculation of ElasticBuffer Over/Underflow RateB.1 GeneralAn important consideration in many applications is bit count integrity (BCI).

46MODULAR MODEM ELIMINATORtransmitted. Other conditions of interest are multiplexed 64-kbps channelstransferred by digital multiplexors.When the digit

NOTES

NOTES

4MODULAR MODEM ELIMINATORTRADEMARKSThe trademarks mentioned in this manual are the sole property of their owners.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746© Copyright 2000. Black Box Corporation. All rights reserved.

5TABLE OF CONTENTSCONTENTSChapter Page1. Specifications...

6MODULAR MODEM ELIMINATORCONTENTS (continued)Chapter Page3. Installation (continued)3.4 Installing of Interface Modules ...

7CHAPTER 1: Specifications1. Specifications1.1 Interface Converter ModeInternal Data Rates—Up to 2048 kbpsTransmission Format—SynchronousTransmission

8MODULAR MODEM ELIMINATOR1.6 Physical DataSize—ME260A, ME260AE: 1.7"H x 10.5"W x 9.6"D (4.4 x 2.7 x 2.4 cm);Interface Modules: 2.7"