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SHM-768K

Figure 3-2. Printed Circuit Board Layout.

CARRIER

XMT CLK

EX INT

V.54
DLY

DTE COMMAND

ALB

RLB

D

I

S

D

I

S

E
N

E
N

ON

CNTRL

EXT
INT
RCV

OFF

ON

3

2

8

4

9

7

5

6

XMT

RCV

GND

760
512
384
256
128

BAUD RATE

(KBPS)

1

X.21 EX CK

XMT LEVEL

DISCONN

CONNECT

CHAS GND

«
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23
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Summary of Contents for ME280A-35

Page 1: ...y 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com MARCH 1997 ME280A...

Page 2: ...ated 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 measures...

Page 3: ...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 las instr...

Page 4: ...na 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 debe s...

Page 5: ...4 SHM 768K TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners...

Page 6: ...stics 12 2 3 4 Test Pattern Generator and Receiver 13 2 3 5 X 21 Buffer for X 21 Interface 13 3 Installation 14 3 1 General 14 3 2 Site Preparation 14 3 3 Mechanical Assembly 14 3 4 Electrical Install...

Page 7: ...Digital Loopback 34 5 6 2 Local Digital Loopback 35 6 19 Rack Version 36 6 1 Description 36 6 2 Card Modem 36 6 3 Power Supply 36 6 4 Installation 37 6 5 Operation 37 6 6 Power Supply Options 38 6 6...

Page 8: ...422 V 36 V 35 X 21 Baud Rates Strap selectable to 128 256 384 512 or 768 kbps RTS CTS Delay 0 msec Connectors ME280A 35 ME280C 35 1 34 pin female ME280A 36 ME280A 530 ME280C 530 1 DB25 female ME280A...

Page 9: ...it clock 1 5 Indicators Transmit Data TD Receive Data RD Request to Send RTS Data Carrier Detect DCD Test TEST Power PWR Bit Errors ERR 1 6 Physical Size ME280A 1 75 H x 9 6 W x 7 6 D 4 4 x 24 3 x 19...

Page 10: ...Up to 95 noncondensing Table 1 1 Approximate Range Baud 22 AWG 24 AWG 26 AWG Rate 0 7 mm 0 5 mm 0 4 mm Kbps km miles km miles km miles 128 6 5 4 1 5 25 3 3 4 25 2 6 256 4 2 2 6 3 5 2 2 2 8 1 7 384 3 1...

Page 11: ...eption of serial data over twisted pair cable Transmit timing is provided internally or derived externally from the data terminal or from the receive signal Receive timing is regenerated from the rece...

Page 12: ...or X 21 connectors for any two adjacent cards Up to seven attachments can be connected side by side 2 3 Functional Description This section contains functional descriptions of the SHM 768K circuit bl...

Page 13: ...lock Recovery and Carrier Detect The clock recovery and carrier detect circuits provide a received clock synchronized with the data and a carrier detect using a digital technique 2 3 3 V 54 DIAGNOSTIC...

Page 14: ...press the PATT button on the remote unit or connect a Bit Error Rate Tester that uses the standard 511 bit pattern 2 3 5 X 21 BUFFER FOR X 21 INTERFACE To allow tail end connection on an X 21 interfa...

Page 15: ...or 230 VAC depending on rated voltage of unit Allow at least 36 inches 90 cm of frontal clearance for operating and maintenance accessibility Allow at least 4 inches 10 cm clearance at the rear of th...

Page 16: ...protection has been damaged make the unit inoperative and secure it against unintended operation WARNING Grounding Interrupting the protective grounding conductor inside or outside the unit or disconn...

Page 17: ...the other unit as either INT or EXT clock Appendix A describes the cabling connection between the EIA 530 interface and the RS 442 V 36 We recommend using a shielded twisted pair cable between the SH...

Page 18: ...gnal 102 7 AB 7 8 Common signal Ground Gnd and DC power supply ground Transmitted 11 S TD B 103 2 BA A 2 2 T A Serial digital Data 9 P TD A 103 14 BA B 14 9 T B data from DTE Transmit The data trans i...

Page 19: ...ut delay after receipt of Request to Send and when the SHM is ready to transmit Data Set 6 E DSR 107 6 CC A A positive level Ready 22 CC B from the SHM when the power is on and the SHM a is not in the...

Page 20: ...he data source Positive clock transitions must corre spond to data transitions Transmit 14 Y SCT A 114 15 DB A 15 6 S A A transmit data Clock 10 a SCT B 114 12 DB B 12 13 S B rate clock for Signal use...

Page 21: ...from the SHM positive during any test mode 3 4 3 STRAP SELECTION When the electrical installation has been completed and checked determine the required configuration of the SHM 768K and position the s...

Page 22: ...ts the transmit timing signal EXT XMT CLK from either internal clock external INT INT clock or receive clock RCV No 3 Selects the transmit carrier mode ON ON CARRIER When ON transmit carrier CNTRL is...

Page 23: ...OFF loopback of tail end circuits No 8 Used only for X 21 interface EX CK X 21 EX CK When using an external clock INT INT set the jumper to EX CK In other cases internal or receive clock set to INT No...

Page 24: ...Circuit Board Layout CARRIER XMT CLK EX INT V 54 DLY DTE COMMAND ALB RLB D I S D I S E N E N ON CNTRL EXT INT RCV OFF ON 3 2 8 4 9 7 5 6 XMT RCV GND 760 512 384 256 128 BAUD RATE KBPS 1 X 21 EX CK XMT...

Page 25: ...ed and checked before attempting to operate the SHM 768K 4 2 Controls and Indicators All controls push button switches and LED indicators are located on the SHM 768K front panel Their functions are de...

Page 26: ...ay also be activated from the DTE when DTE COMMAND ALB strap is set to EN C REM The Remote Digital Loopback V 54 Loop 2 switch causes the remote SHM 768K to loop received data and clock to its transmi...

Page 27: ...hen steady SPACE is being transmitted It flickers when data is transmitted 4 RD Yellow LED is ON when steady SPACE is being received It flickers when data is received 5 DCD Yellow LED is ON when a val...

Page 28: ...27 SHM 768K Figure 4 2 SHM 768K Card Version Front Panel TD REM ANA DCD TEST ERR RD RTS PWR ASM 45 DIG PATT RAD...

Page 29: ...e in operation and passing data by checking that the front panel LEDs match the indicator conditions described below If the LEDs do not match the indicator conditions verify that none of the front pan...

Page 30: ...e of operation field straps must be changed to correspond to the new operating mode For guidance in repositioning the straps and switches refer to Section 3 4 4 and to Table 3 2 Field straps should be...

Page 31: ...normal system operation and to isolate faulty equipment in the event of failure Each test verifies the operational performance of a unit in the system or provides a positive indication of equipment fa...

Page 32: ...ERT press the PATT button If errors are encountered the ERROR LED will light continuous errors or blink intermittent errors When PATT is pressed the ERROR LED will light for a short time to confirm th...

Page 33: ...hat the RTS signal is ON high Step B Press the PATT button Verify that DCD LED is still lit TEST LED is still lit RD LED lights ERR LED lights for a short period The ERR LED should then go off If it l...

Page 34: ...t can also be activated via the pin on the DTE interface The TEST LED should turn on The SHM 768K transmit output is now connected to its own receiver Step B Verify that the data terminal equipment is...

Page 35: ...he OFF position by pressing it again Proceed to the Communication Link Tests Section 5 6 5 6 Communication Link Tests 5 6 1 REMOTE DIGITAL LOOPBACK This test determines the performance of both the loc...

Page 36: ...om the remote SHM 768K refer to Figure 5 5 The operator at the remote end can determine the performance of the local and remote SHM 768K units and of the lines between them Figure 5 5 Local SHM 768K i...

Page 37: ...ors for any two adjacent cards 6 2 Card Modem The SHM 768K Card short range modems part number ME280C 35 and ME280C 530 are card versions of the SHM 768K Indicator LEDs and test push buttons of each M...

Page 38: ...re removing or replacing the fuse WARNING Whenever it is likely that the fuse protection has been damaged make the unit inoperative and secure it against unintended operation Grounding Interrupting th...

Page 39: ...Rack Installation 6 6 Power Supply Options 6 6 1 CHOOSING A POWER SUPPLY Three power supply options are available Single or dual transformer of 100 VA 4 25A x 24 VAC Single transformer of 200 VA 8 5A...

Page 40: ...S Option Per Unit ME280C 530 9 VA 100 VA 10 Cards 200 VA 14 Cards ME280C 35 7 VA 100 VA 14 Cards 6 6 2 TWO TRANSFORMER OPTION This option provides dual redundant 100 VA transformers in a single power...

Page 41: ...40 SHM 768K Figure 6 2 Rack Enclosure with Dual Power Supply The item numbers in Table 6 2 correspond to the reference numbers in Figure 6 2 1 GND RCV XMIT 2 PS 1 PS 2 Power 3 4 5 6 8 7 9...

Page 42: ...Indicator DT power Lights when Power Supply 1 PS 1 is supply only operating 5 PS 1 PS 2 Selector Selects the active power supply DT power supply only 6 PS 2 Indicator Lights when Power Supply 2 PS 2 i...

Page 43: ...AB Transmitted Data 4 SD B 2 BA A 22 SD A 14 BA B Received Data 6 RD A 3 BB A 24 RD B 16 BB B Request to Send 7 RS A 4 CA A 25 RS B 19 CA B Clear to Send 9 CS A 5 CB A 27 CS B 13 CB B Data Set Ready 1...

Page 44: ...nnecting SHM 768K to RS 422 V 36 DTE continued Signal Function RS 449 RS 422 423 EIA 530 37 pins DB25 Female Standalone and Frame Pin Circuit Pin Circuit Local Analog 10 LL 18 LL Loopback Remote Loopb...

Page 45: ...opening the unit B 1 Installation of a Single Unit Rack adapter components for installing a single unit include one short bracket and one long bracket Each bracket is fastened to the side walls of th...

Page 46: ...k by means of the two screws situated on each side not included in the kit B 2 Installation of Two Units Rack adapter components for installing two units include two long side rails one for each unit...

Page 47: ...Attach one short bracket opposite the side rail on each unit using the 4 screws and flatwashers supplied 3 Slide the side rail of one unit into the side rail of the other unit fastening the two units...

Page 48: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1997 Black Box Corporation All rights reserved...

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