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CHAPTER 2: Introductions

Figure 2-15. Elastic buffer application (data, check,

and interface control signals diagram).

Internal Clock

J1

J2

DTE Mode

DTE Mode

DCE

DCE

Internal Clock

DCD-1 controls Buffer A
DCD-2 controls Buffer B

TD

TC

RTS

RC

RD

DCD

DSR

DTR

CTS

PG

SG

RC

RD

DCD

TC

TD

RTS

DTR

DSR

CTS

PG

SG

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Summary of Contents for ME260A

Page 1: ...6 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com AUGUST 2000 ME260A ME265C ME260AE ME266C ME261C ME267C ME262C ME268C ME263C...

Page 2: ...s operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever mea...

Page 3: ...aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en l...

Page 4: ...r una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado deb...

Page 5: ...4 MODULAR MODEM ELIMINATOR TRADEMARKS The trademarks mentioned in this manual are the sole property of their owners...

Page 6: ...Interface Modules 16 2 2 7 General Characteristics 17 2 3 Applications 18 2 3 1 Interface Converter Applications 18 2 3 2 Interfacing by General Purpose Modules 20 2 3 3 Interfacing with 64 kbps Codi...

Page 7: ...rs 38 4 2 Operating Instructions 39 4 2 1 Power On Procedure 39 4 2 2 Operating Instructions 39 4 2 3 Normal Indications 39 4 2 4 Power Off Procedure 39 5 Troubleshooting 40 5 1 Things To Try 40 5 2 C...

Page 8: ...048 kbps RTS CTS Delay 0 6 or 51 msec separately selected by jumpers for each interface DCD Continuously ON or controlled by the RTS signal separately selected by jumpers for each interface 1 3 Elasti...

Page 9: ...x 2 4 cm Interface Modules 2 7 H x 0 06 W x 3 9 D 7 0 x 0 1 x 9 9 cm Weight ME260A ME260AE 4 1 lb 1 9 kg ME261C ME263C 2 4 oz 70 g ME262C 4 0 oz 115 g ME265C 2 6 oz 75 g ME266C 3 2 oz 90 g ME267C ME26...

Page 10: ...1 MAIN UNIT The main unit includes the internal power supply and the central control circuits The main unit is available in two models Modular Modem Eliminator 115 VAC part number ME260A this model c...

Page 11: ...048 Mbps interface G 703 DB15 part number ME268C 1 544 Mbps interface Each G 703 interface module includes the corresponding line driver and line receiver clock recovery functions and a jitter attenua...

Page 12: ...the operation of two modems connected in a link one for each DTE This includes supplying clock signals and handshaking control signals The data rate is derived from an internal oscillator and is sele...

Page 13: ...iming options available in each operating mode refer to Sections 2 2 5 and 2 2 6 General Purpose Interface Modules The timing mode of a general purpose interface module is selected via the DCE DTE swi...

Page 14: ...transmit paths Note that for the X 21 interface the module has only a receive clock input Figure 2 2 shows the flow of timing signals for the DTE mode Figure 2 2 Flow of timing signals for DTE mode I...

Page 15: ...original data and clock signals from the received signal Thus the receive path of the G 703 64 kbps co directional internal module always operates on the clock signal recovered from the received line...

Page 16: ...lock this mode is called loopback timing Figure 2 4 shows the flow of timing signals with loopback timing Figure 2 4 Flow of timing signals for LBT mode Transmit Circuits Transmit Line Signal Receive...

Page 17: ...signal recovered from the received line signal The clock signal used by the module transmit path can be selected by means of a jumper The jumper has three positions INT the transmit clock is derived f...

Page 18: ...Modem Eliminator is a compact unit intended for installation on a desktop or shelf An adapter kit for mounting in 19 racks is available part number RM518 The Modular Modem Eliminator is powered from...

Page 19: ...E to a DCE that has a different interface Any combination of DTE and DCE interfaces can be supported by installing the appropriate type of plug in interface modules in the Modular Modem Eliminator In...

Page 20: ...ng an E1 digital network for example even when the bridges do not have E1 interfaces Figure 2 7 shows an application where bridges with a V 35 interface communicate over the E1 digital network transpa...

Page 21: ...DCE position and the mode jumper of the other module must be set to the DTE position Interface control signals are then transparently transferred from side to side as shown in Figure 2 8 NOTE The dat...

Page 22: ...jumper of the 64 kbps co directional interface module is set in accordance with the system timing requirements LBT used to lock the DTE timing to the recovered lock signal This setting is suitable for...

Page 23: ...ovided by the T1 or E1 network The DTE must then use external timing INT used to lock the DTE timing to the internal clock source of the T1 or E1 interface module The DTE must use external timing EX u...

Page 24: ...tor emulates modems on both sides the mode switches on the two interface modules must be always set to the DCE position To permit half duplex operation the Modular Modem Eliminator has two carrier con...

Page 25: ...ock Figure 2 12 shows the flow of the clock signals in this mode as well as the flow of interface control signals External EXT timing the Modular Modem Eliminator accepts an external clock signal from...

Page 26: ...he flow of interface control signals Figure 2 13 Modem eliminator application showing the flow of clock and interface control signals in the EXT timing mode Internal Clock J1 J2 DCE Mode DCE Mode DTE...

Page 27: ...cks the data in and a read clock that clocks the data out The Modular Modem Eliminator has two independent 256 bit buffers one for each direction of data transmission Figure 2 15 on the next page show...

Page 28: ...fer application data check and interface control signals diagram Internal Clock J1 J2 DTE Mode DTE Mode DCE DCE Internal Clock DCD 1 controls Buffer A DCD 2 controls Buffer B TD TC RTS RC RD DCD DSR D...

Page 29: ...f you suspect damage Modular Modem Eliminator 115 VAC with ME260A or 230 VAC with ME260AE power supply This User Manual The Modular Modem Eliminator accepts two Interface Modules which are ordered sep...

Page 30: ...for your particular application and gives you step by step instructions for changing the position of these jumpers In addition to setting the jumpers you must set the internal switches on each interfa...

Page 31: ...e signal ground is not connected to the chassis ground The Modular Modem Eliminator is shipped with the jumper set at CONNECT MODE SELECT JP6 Selects the Modular Modem Eliminator operating mode ME Mod...

Page 32: ...mode only Selects the timing source in the ME mode INT Modular Modem Eliminator internal oscillator The data rate is determined by the RATE selector EXT J1 The transmit clock applied to connector J1...

Page 33: ...minator may still be charged even after it has been disconnected from its source of supply To change jumper setting follow these steps 1 Disconnect the AC power cable from the mains 2 Unscrew the scre...

Page 34: ...Figure 3 4 G 703 interface modules XMT TIMING INT CLK EX CLK LBT CLK XMT TIM ING INT CLK EX CLK LBT CLK RATE XMTTIMING 64 kbps 128 kbps INT LBT J P 1 J P 2 64 kbps co directional interface module G 7...

Page 35: ...jumper that selects the source of the transmit clock has two positions INT the transmit clock is derived from an internal oscillator LBT the transmit clock is locked to the recovered receive clock thi...

Page 36: ...are fastened by two captive screws to the rear panel To remove a module release the two captive screws and pull the module out To install a module carefully insert the module board into the rails and...

Page 37: ...let provided with a protective earth grounding contact The protective action must not be negated by use of an extension cord without a grounding conductor Make sure that only fuses of the required rat...

Page 38: ...3 5 4 GROUNDING Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting the protective earth terminal can make this instrument dangerous Intentional i...

Page 39: ...tors No Control or Indicator Function 1 PWR indicator Lights when the Eliminator is powered 2 TD 1 indicator Indicates activity on the transmit data line in connector J1 3 RD 1 indicator Indicates act...

Page 40: ...operating as soon as AC power is applied Always connect the cable first to the Eliminator s power connector and then to the mains outlet The PWR indicator and the appropriate MODE indicator light whe...

Page 41: ...l switches are set to the correct positions See Sections 3 2 3 and 3 2 4 Check that the cables between the Modular Modem Eliminator and the attached equipment are properly connected 5 2 Calling Black...

Page 42: ...ly We recommend that you use the original container If you are shipping the unit for repair please include all parts of its external power supply If you are returning the unit please include everythin...

Page 43: ...Protective AA 1 101 A 1 Shield 1 Ground Shield Signal SG AB 7 102 B 19 SG G Ground 8 Ground Common return DTE DCE 102a 37 SC Common Return DCE DTE 102b 20 RC Common Return Data Transmitted TD DCE BA 2...

Page 44: ...CE DA 24 113 U A Bal 17 A TT Clock W9B 35 B from DTE Transmit TC DTE DB 15 114 Y A Bal 5 A ST S Signal Clock AA B 23 B Timing from DCE Receive RC DTE DD 17 115 V A Bal 8 A RT 6 A Clock X B 26 B 13 B f...

Page 45: ...3 balanced interface modules have a 15 pin D type female connector wired as shown in Table A 2 Table A 2 CCITT Rec G703 pin connection Pin Function 1 Transmit line 2 Not used 3 Receive line 4 through...

Page 46: ...gained The slippage rate is nominally equal to the difference in clock rates times the data rate bits second For example when the clock accuracy is 100 parts per million ppm the worst case clock diffe...

Page 47: ...Eliminator is given by Slippage Rate 64 x 103 x 3 x 10 10 x 1 128 1 5 x 10 7 bits second This is equal to one slippage every 1851 hours or one slippage every two and half months When making accurate c...

Page 48: ...NOTES...

Page 49: ...NOTES...

Page 50: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 2000 Black Box Corporation All rights reserved...

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