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SHM-768K

Figure 3-1. SHM-768K Rear Panel.

NOTE

For applications using an X.21 interface external clock (DTE timing
source), connect the input clock to pins 7(A) and 14(B) of the 15-pin
connector.

We recommend that you configure one of the units as RCV clock, and 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 SHM-
768K and the DTE. The receivers on the SHM-768K are 100

Ω

terminated

(for X.21 and RS-530). If problems are encountered with the connection
to the DTE interface, make sure that the DTE interface is terminated
correctly.

GND

RCV

TB1

XMT

DTE (J1)

FUSE

AC MAINS

CABLE

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Содержание ME280A-35

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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