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Mailing address:

Black Box Corporation

, 1000 Park Drive, Lawrence, PA 15055-1018

Web site:

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• E-mail:

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CUSTOMER

SUPPORT

INFORMATION

DECEMBER 2001

ME251A-R3

ME251AE-R3

ME251C-R3
ME253A-R2

ME253AE-R2

ME253C-R2
ME255A-R2

ME255AE-R2

ME255C-R2

Synchronous Modem

Eliminator (SME-4M)

SME-4

DSR TXD CTS

B B B

R I C O N

L B

CTS TXD DSR

A A

Summary of Contents for ME251A-R3

Page 1: ...6 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com CUSTOMER SUPPORT INFORMATION DECEMBER 2001 ME251A R3 ME251AE R3 M...

Page 2: ...erated 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 measure...

Page 3: ...flujo de aire por los orificios de ventilaci n 10 El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amp...

Page 4: ...TRADEMARK STATEMENT 3 TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners...

Page 5: ...iminator SME 4M 4 Contents Chapter Page 1 Specifications 5 2 Description 6 3 Installation 8 3 1 LED Displays 10 4 Digital Loopback Test 12 5 Application Notes 13 6 RS 232 Interface 14 7 Nonstandard Tr...

Page 6: ...Unit 2 lb 0 9 kg Enclosure High impact plastic Connectors 2 DB25 female mounted on rear panel Interface RS 232C CCITT V 24 V 28 serial synchronous or asynchronous Indicators 6 LEDs TX Data CTS and DS...

Page 7: ...and simplifies installation and replacement in the field Since no special tools are required the SME 4M unit is designed for o it yourself installation Six indicators and three front panel switches fa...

Page 8: ...dicators and Straps CTS B TXD B DSR B LB CON RI DSR A TXD A CTS A AC PWR Y1 W7 DSR B REM LOC 50ms 10ms 0ms CTS B DELAY W3 50ms 10ms 0ms CTS B DELAY W4 U9 U7 U8 U10 U5 U2 W8 CD B ON SW W9 DSR A REM LOC...

Page 9: ...ng mode by installing the speed selection strap W2 in Figure 2 3 to async or the desired synchronous speed as shown below For more information see Chapter 7 PART NUMBER SPEED STRAP POSITION ME251A R3...

Page 10: ...raps In the remote position the DSR signal is generated when the other port receives a DTR signal In the local position DSR is always on 10 The CD Carrier Detect option is controlled by setting the A...

Page 11: ...A to port B OFF no data flow from port A to port B DSR ON Data Set Ready signal ON OFF Data Set Ready signal OFF DSR A ON indicates a DSR signal pin 6 out from port A OFF indicates no DSR signal pin 6...

Page 12: ...icates a CTS signal pin 5 out from port A OFF indicates no CTS signal pin 5 out from port A CTS B ON indicates a CTS signal pin 5 out from port B OFF indicates no CTS signal pin 5 out from port B NOTE...

Page 13: ...1 Press the loopback switch the switch must remain in the IN position on the front panel to loopback at the digital interfaces for both devices connected to the SME 4M 2 Enter data at the terminal or...

Page 14: ...DSR A Local CD B SW DSR B Local Set all front panel pushbuttons in the OUT position NOTE The IBM device parameters should be set for non switched leased line 4 With DSR A and B configured Remote the D...

Page 15: ...lear To Send Control From DCE 6 CC Data Set Ready Control From DCE 7 AB Signal Ground Ground 8 CF Data Carrier Detect Control From DCE 9 DC Test Voltage 10 DC Test Voltage 11 Unassigned 12 SCF Seconda...

Page 16: ...19 SCA Secondary Request Control To DCE To Send 20 CD Data Terminal Ready Control To DCE 21 CG Signal Quality Control From DCE Detector 22 CE Ring Indicator Control From DCE 23 CH Data Signal Rate Con...

Page 17: ...22 23 24 25 PROTECTIVE GROUND TRANSMITTED DATA RECEIVED DATA REQUEST TO SEND CLEAR TO SEND DATA SET READY SIGNAL GROUND COMMON RETURN RECEIVED LINE SIGNAL DETECTOR VOLTAGE VOLTAGE SECONDARY RECEIVED...

Page 18: ...set the SME 4M for one of these different speeds configure the unit according to the chart below Table 7 1 SME 4M Synchronous Transmission Speeds ME251 ME253 ME255 CRYSTAL 2 4576 MHz 1 792 MHz 2 048...

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