Black Box ME375A-R2 Operation & User’s Manual

Operation & User’s Manual for Black Box ME375A-R2 Modem (34 pages)

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778/778596-me375ar2.pdf file (03 Dec 2023)
  • Manufacturer: Black Box
  • Category of Device: Modem
  • Document: ME375A-R2, File Type: PDF Operation & User’s Manual
  • Updated: 03-12-2023
  • Count of Pages: 34
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Compatible devices: SHM-B Sync, ME500A, LES1204A-3G, ME795A, MD885A-R2, G.703 NTU w/V35, ME759C-RJ11, MDS931C-2.

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  • Page 1:

    CUSTOMER

    SUPPORT

    INFORMATION

    Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX

    FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

    Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

    Web site: www.blackbox.com • E-mail: [email protected]

    MARCH 1998

    ME375A-R2

    ME375AE-R2

    ME376A-R2

    ME376AE-R2

    Async/Sync 2-Wire Short Haul Modem

    ASYNC/SYNC 2-WIRE SHORT HAUL MODEM

    DIG

    ANA

    PWR

    RTS

    TD

    RD

    DCD

    LOS

    ERR

    TEST

    REM

    PATT

    RESET

  • Page 2:

    3

    FCC/IC RFI STATEMENTS, SAFETY WARNING

    FEDERAL COMMUNICATIONS COMMISSION

    AND

    CANADIAN DEPARTMENT OF COMMUNICATIONS

    RADIO FREQUENCY INTERFERENCE STATEMENTS

    This equipment generates, uses, and can radiate radio frequency energy and if not

    installed and used properly, that is, in strict accordance with the manufacturer’s

    instructions, may cause interference to radio communication. It has been tested

    and found to comply with the limits for a Class A computing device in accordance

    with the specifications in Subpart J of Part 15 of FCC rules, which are designed to

    provide reasonable protection against such interference when the equipment is

    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 measures may be necessary to correct the

    interference.

    Changes or modifications not expressly approved by the party responsible for

    compliance could void the user’s authority to operate the equipment.

    This digital apparatus does not exceed the Class A limits for radio noise emission from digital

    apparatus set out in the Radio Interference Regulation of the Canadian Department of

    Communications.

    Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites

    applicables aux appareils numériques de classe A prescrites dans le Règlement sur le brouillage

    radioélectrique publié par le ministère des Communications du Canada.

    SAFETY WARNING

    Always observe standard safety precautions during installation, operation, and

    maintenance of this product. If you attempt to remove the power-supply fuse, be

    sure to disconect the power cord from the power source first, in order to avoid the

    possibility of electric shock.

  • Page 3:

    4

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    NORMAS OFICIALES MEXICANAS (NOM)

    ELECTRICAL SAFETY STATEMENT

    INSTRUCCIONES DE SEGURIDAD

    1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de

    que el aparato eléctrico sea operado.

    2. Las instrucciones de seguridad y operación deberán ser guardadas para

    referencia futura.

    3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de

    operación deben ser respetadas.

    4. Todas las instrucciones de operación y uso deben ser seguidas.

    5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca

    de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..

    6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que

    sean recomendados por el fabricante.

    7. El parato eléctrico debe ser montado a la pared o al techo sólo como sea

    recomendado por el fabricante.

    8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá

    a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser

    referido a personal de servicio calificado.

    9. El aparato eléctrico debe ser situado de tal manera que su posición no

    interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá,

    alfombra o superficie similar puede bloquea la ventilación, no se debe colocar

    en libreros o gabinetes que impidan el flujo de aire por los orificios de

    ventilación.

  • Page 4:

    5

    NOM STATEMENT

    10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor

    como radiadores, registros de calor, estufas u otros aparatos (incluyendo

    amplificadores) que producen calor.

    11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del

    tipo descrito en el instructivo de operación, o como se indique en el aparato.

    12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización

    del equipo no sea eliminada.

    13. Los cables de la fuente de poder deben ser guiados de tal manera que no

    sean pisados ni pellizcados por objetos colocados sobre o contra ellos,

    poniendo particular atención a los contactos y receptáculos donde salen del

    aparato.

    14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las

    recomendaciones del fabricante.

    15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas

    de energia.

    16. El cable de corriente deberá ser desconectado del cuando el equipo no sea

    usado por un largo periodo de tiempo.

    17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean

    derramados sobre la cubierta u orificios de ventilación.

    18. Servicio por personal calificado deberá ser provisto cuando:

    A: El cable de poder o el contacto ha sido dañado; u

    B: Objectos han caído o líquido ha sido derramado dentro del aparato; o

    C: El aparato ha sido expuesto a la lluvia; o

    D: El aparato parece no operar normalmente o muestra un cambio en su

    desempeño; o

    E: El aparato ha sido tirado o su cubierta ha sido dañada.

  • Page 5:

    6

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    Contents

    Chapter Page

    1. Specifications ............................................................................................. 7

    2. Introduction ............................................................................................. 10

    3. Installation ................................................................................................ 11

    3.1 Placement .......................................................................................... 11

    3.2 Setting the Internal Controls ........................................................... 11

    3.3 Connecting the Data Cables ............................................................. 16

    3.4 Connecting to AC Power .................................................................. 17

    4. Operation ................................................................................................. 19

    4.1 The Front-Panel Controls and Indicators ....................................... 19

    4.2 Power-Up, Normal Operation, and Power-Down ........................... 22

    4.3 Reconfiguration ................................................................................ 23

    5. Troubleshooting ...................................................................................... 24

    5.1 Diagnostic Testing ............................................................................ 24

    5.2 Calling Black Box .............................................................................. 28

    5.3 Shipping and Packaging ................................................................... 28

    Appendix: Pinouts .......................................................................................... 29

    Legal Information ........................................................................................... 33

  • Page 6:

    7

    CHAPTER 1: Specifications

    1. Specifications

    Compliance — FCC Part 15 Subpart J Class A, DOC Class/MDC classe A

    Standard — T1: ANSI T1.601.1988

    Interfaces — ME375 models: 2-wire telco, EIA RS-232;

    ME376 models: 2-wire telco, ITU-TSS (CCITT) V.35

    Protocols — DTE side: Synchronous or asynchronous;

    Line side: 2B1Q encoding

    Clock Source — Internal, external (from DTE), or received (from other

    unit), user-selectable

    Data Format — 7 or 8 data bits; 1 or 2 stop bits; even, odd, or no parity

    (user-selectable)

    Operation — Line side: Full duplex with echo cancellation

    Data Rate — 128, 115.2, 64, 57.6, 48, 38.4, 19.2, 9.6, 4.8, 2.4, 1.2, and

    0.6 Kbps

    Transmission

    Level — Up to 14 dBm

    Maximum

    Distance — DTE side:

    ME375 models: 50 ft. (15.2 m);

    ME376 models: 25 ft. (7.6 m);

    Line side: 3.4 mi. (5.5 km) over 26-AWG wire,

    independent of data rate

  • Page 7:

    8

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    User Controls — (5) Front-mounted:

    (4) Pushbuttons: DIG (local digital loopback), ANA

    (local analog loopback), REM (remote digital

    loopback), and PATT (test pattern);

    (1) Recessed RESET switch;

    (6) Internal:

    (1) 7-position DIP switch for protocol, data format,

    and signaling options;

    (1) Rotary switch for data rate;

    (4) Jumpers for clock source, loopback testing, and

    ground connection

    Diagnostics — V.54-compliant loopback tests:

    Local analog loopback (switch- or signal-triggerable);

    Local digital loopback (switch-triggerable);

    Remote digital loopback (switch- or signal-triggerable)

    Indicators — (8) Front-mounted LEDs: PWR (power), RTS, TD, RD,

    DCD, LOS (loss of signal), ERR (error), and TEST

    Connectors — ME375 models: (1) RJ-45 female, (1) 3-clip terminal

    block, and (1) DB25 female;

    ME376 models: (1) RJ-45 female, (1) 3-clip terminal

    block, and (1) 34-pin M-block female

    Leads/Signals

    Supported — See the Appendix

    Power — From internal power supply through included or

    alternate 5-ft. (1.5-m) power cord:

    ME375A-R2, ME376A-R2:

    Input: 103.5 to 131.5 VAC, 47 to 63 Hz;

    ME375AE-R2, ME376AE-R2:

    Input: 207 to 253 VAC, 47 to 63 Hz;

    Consumption: 5 VA

  • Page 8:

    9

    CHAPTER 1: Specifications

    Fuse — ME375A-R2, ME376A-R2: 0.1-A slow-blow;

    ME375AE-R2, ME376AE-R2: 0.2-A slow-blow

    Other Power

    Protection — AC/DC overvoltage-protection circuits connected

    through transformers to transmit and receive leads on

    the line side, plus special gas diodes

    MTBF — 75,500 hours

    Maximum

    Altitude — 8000 ft. (2438.4 m)

    Temperature

    Tolerance — 32 to 122˚ F (0 to 50˚ C)

    Humidity

    Tolerance — Up to 90% noncondensing

    Enclosure — High-impact plastic

    Size — 1.8"H x 7.6"W x 9.6"D (4.6 x 19.3 x 24.3 cm), but the

    unit’s pushbuttons protrude up to 0.1" (25 mm) from

    the front panel and the connectors protrude up to 0.8"

    (1.9 cm) from the rear panel

    Weight — Net: 3.1 lb. (1.4 kg);

    Shipping: 6 lb. (2.7 kg)

  • Page 9:

    10

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    2. Introduction

    The Async/Sync 2-Wire Short Haul Modem (A/S2W SHM) operates synchronously

    or asynchronously at high speeds (600 bps to 128 Kbps) and in full duplex over

    one pair of dedicated telephone lines. It has a range of 3.4 miles (5.5 km) over

    26-AWG wire.

    The A/S2W SHM operates in full duplex over 2 wires by using the adaptive

    “echo-canceling” technique. Because it also uses 2B1Q line coding, it can achieve

    the range mentioned above no matter what the data rate is.

    The A/S2W SHM incorporates interface circuits for the terminal/computer, an

    adaptive echo-canceler, an automatic adaptive equalizer, a modulator, and a

    demodulator. It is coupled to the telephone line through an isolation transformer,

    which protects against AC or DC overvoltages. The protection circuitry would

    enable the unit to operate even if DC were accidentally connected to the line.

    The A/S2W SHM has diagnostic capabilities: It can perform local analog

    loopback and local and remote digital loopback. The operator at either end of the

    line may test both modems and the line in the remote digital loopback mode.

    Loopback can be controlled with either the unit’s front-panel pushbuttons or

    signals passed through the DTE (PC, data-terminal) interface.

  • Page 10:

    11

    CHAPTER 3: Installation

    3. Installation

    This chapter tells you how to configure and install the Async/Sync 2-Wire Short

    Haul Modem. After you finish doing this, refer to Chapter 4 for operating

    information.

    3.1 Placement

    The Async/Sync 2-Wire Short Haul Modem is designed to be placed on a tabletop,

    shelf, or bench, and is delivered completely assembled. (No provisions are made

    for bolting the A/S2W SHM to any surface.)

    The A/S2W SHM should be installed within 1.5 m (5 ft) of a grounded AC

    outlet and must be situated within 25 ft. (7.6 m—ME376 models) or 50 ft. (15 m—

    ME375 models) of the associated data terminal.

    Allow at least 36" (90 cm) of clearance in front of the unit so you can access it

    during operation and maintenance. Make sure that there is at least 4" (10 cm) of

    clearance behind the unit for signal lines and interface cables.

    3.2 Setting the Internal Controls

    Before you install any cabling and definitely before you plug in the unit, you

    should set the Async/Sync 2-Wire Short Haul Modem’s internal controls to suit

    your application. (If you don’t feel comfortable about doing this yourself, get an

    experienced technician to do it or to help you.) To access the internal controls,

    first make sure the A/S2W SHM is disconnected from AC power, then unscrew the

    two screws on the unit’s rear panel and slide the bottom half of the unit out from

    beneath its cover.

    Refer to Figure 3-1 on the next page and Table 3-1 on the succeeding pages for

    the locations of the controls and their possible settings respectively.

  • Page 11:

    12

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    DSR

    DCD

    1STB

    EVEN

    P.EN

    8BIT

    ASY

    DTR

    CNT

    2STB

    ODD

    DIS

    7BIT

    SYNC

    9MS

    CLOCK

    LBT

    INT

    EXT

    SW

    7

    0 0.6K

    1 1.2K

    2 2.4K

    3 4.8K

    4 9.6K

    5 19.2K

    6 38.4K

    7 48K

    8 56K

    9 64K

    A 128K

    POS BAUD

    D

    IS

    EN

    R

    LB

    DIS

    EN

    LLB

    CHASS-GND

    CON

    DIS

    1

    2

    3

    4

    5

    6

    ON

    Figure 3-1. The A/S2W SHM’s internal controls and indicators.

  • Page 12:

    13

    CHAPTER 3: Installation

    Table 3-1. Possible Settings of Internal Controls

    Callout Description Position/Label Possible Factory-

    No. in Settings Default

    Fig. 3-1 Setting

    1 DIP Switch Position 1 Async or sync Sync

    ON = ASYNC operation

    OFF = SYNC

    Position 2 8 or 7 data bits 8 bits

    ON = 8BIT

    OFF = 7BIT

    Position 3 Parity enabled Disabled

    ON = PRTY or disabled

    OFF = DIS

    Position 4 Even or odd Even

    ON = EVEN parity

    OFF = ODD

    Position 5 1 or 2 stop bits 1 bit

    ON = 1STB

    OFF = 2STB

    Position 6* DCD independent DCD ind.

    ON = DCD or controlled by

    OFF = CNT RTS

    Position 7† DSR always ON or DSR ON

    ON = DSR follows DTR

    OFF = DTR

    *If DIP Switch Position 6 is set to:

    • DCD: The DCD signal is ON as long as the local unit is in proper

    synchronization with the remote unit. The DCD signal is OFF when

    digital loopback is active or when there is no synchronization (for

    example, while the unit is receiving the remote loopback command).

    • CNT: The local unit’s DCD signal follows the remote unit’s RTS signal.

    †If DIP Switch Position 7 is set to:

    • DSR: The DSR signal is ON as long as the local unit is receiving AC

    power; it does not indicate the existence of a communication channel

    or the status of the remote site.

    • DTR: The local unit’s DSR signal follows the remote unit’s DTR signal.

  • Page 13:

    14

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    Table 3-1. Possible Settings of Internal Controls (cont’d.)

    Callout Description Position/Label Possible Factory-

    No. in Settings Default

    Fig. 3-1 Setting

    2 Data-Rate Position 0 0.6K 0.6 Kbps

    Dial* Position 1 1.2K 1.2 Kbps

    Position 2 2.4K 2.4 Kbps

    Position 3 4.8K 4.8 Kbps

    Position 4 9.6K 9.6 Kbps

    Position 5 19.2K 19.2 Kbps

    Position 6 38.4K 38.4 Kbps

    Position 7 48K 48 Kbps

    (Position 8 56K)† (56 Kbps)

    Position 9 64K 64 Kbps

    64 Kbps (P9)

    Position A 128K 128Kbps

    (Position B 144K)† (144 Kbps)

    Position C 57.6K** 57.6 Kbps

    Position C 115.2K** 115.2 Kbps

    *Setting this dial has no effect or purpose if the unit is set to use the

    external clock.

    †These data-rate settings are not supported by the standard A/S2W SHM.

    If you need to transfer data at one of these speeds, call Black Box

    Technical Support for a special quote on a unit that will.

    **These settings (popular speeds for direct computer-to-computer

    communication) do not work properly unless the A/S2W SHM

    communicates with the DTE asynchronously (DIP Switch Position 1 set to

    ON).

  • Page 14:

    15

    CHAPTER 3: Installation

    Table 3-1. Possible Settings of Internal Controls (cont’d.)

    Callout Description Function/Label Possible Factory-

    No. in Settings Default

    Fig. 3-1 Setting

    3 Clock-Source For master units, select INT INT

    (CLOCK) either internal timing (INT) EXT

    Jumper or external timing (EXT). LBT

    For slave units, always select

    loopback (received) timing

    (LBT).

    4 Local Enable/disable control of DIS DIS

    Loopback local analog loopback EN

    (LLB) testing with signals from

    Jumper* the DTE

    5 Remote Enable/disable control of DIS DIS

    Loopback remote digital loopback EN

    (RLB) testing with signals from

    Jumper* the DTE

    6 Chassis- Tie Signal Ground to Chassis CON CON

    Ground (Protective, Frame) Ground DIS

    (CHASS_ or isolate the two grounds

    GND) from each other

    Jumper

    *Only connect the RLB and LLB jumpers (that is, set them to EN [enabled])

    if you want to be able to turn local analog or remote digital loopbacks on

    and off from the DTE using the proper RS-232 or V.35 signals. The settings

    of these jumpers have no effect on the ANA and REM pushbutton switches

    on the unit’s front panel; you will be able to control loopback testing with

    those buttons whether these jumpers are connected or not. (There is no

    way to control local digital loopback through the local DTE interface; you

    must use the DIG button to do that.)

  • Page 15:

    16

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    3.3 Connecting the Data Cables

    To connect your data cables to the Async/Sync 2-Wire Short Haul Modem, take

    these steps, referring to Figure 3-2 below:

    1. Connect the twisted-pair transmission line to the two clips marked LINE (or

    Pins 4 and 5 of the RJ-45 connector) and (optionally) the cable shield to the

    clip marked GND (or Pin 2 of the RJ-45 connector). If you are using the

    connecting the line to the clips, refer to Wire-Insertion Details on the next

    page. We highly recommend that for your transmission line you use twisted-

    pair cable capable of supporting high data rates, especially Category 3 or

    better, in order to prevent crosstalk. Our product code for a type of cable that

    fits the bill, bulk unterminated Category 5 UTP, is EYN717A (specify the

    length you want).

    2. Run the DTE-side cable from the DTE to the A/S2W SHM. If your A/S2W

    SHM is an ME375 model, this cable should be straight-through-pinned and 50

    or fewer feet (15.2 or fewer meters) long; it should also have a DB25 female

    connector on the DTE end and a DB25 male connector on the A/S2W SHM

    end. (Our product code for this type of cable is ECM25C; specify the length

    you want and “male-female” genders).

    If your A/S2W SHM is an ME376 model, this cable should be straight-

    through-pinned and 25 or fewer feet (7.6 or fewer meters) long; it should also

    have a 34-pin M-block male connector on the A/S2W SHM end. (Our

    product code for this type of cable is EYN450; specify the length and genders

    you want.)

    Fig. 3-2. The A/S2W SHM’s rear panel.

    DTE

    LINE

    GND

    24 5

    100-115 VAC/

    0.2A T 250

    230V/ O.1A T 250V

  • Page 16:

    17

    CHAPTER 3: Installation

    3.4 Connecting to AC Power

    AC power is supplied to the A/S2W SHM through an included or alternate 1.5-m

    (5 ft) cord terminated with a grounded plug. Make sure that, before you plug the

    cord into the unit and an outlet, that proper grounding rules are observed:

    • If you are using an alternate cord, it must have a ground wire that runs from

    the unit’s ground (earth) terminal (the topmost of the three prongs on the

    unit’s IEC 320 male power inlet) to the ground terminal on the outlet.

    • Do not use an extension cord with the unit unless it also has a ground wire

    that runs between ground terminals at either end.

    Once you are sure of proper grounding, run the power cord from the A/S2W

    SHM’s IEC320 male power inlet to a working outlet. As soon as the cord is plugged

    in at both ends, the unit will begin operating, because it has no power switch. (To

    turn the unit on and off, you must plug it in and unplug it.) The PWR LED should

    light; see Section 4.2.

    Wire Insertion Details

    1) Insert screwdriver into square hole.

    2) Raise inserted screwdriver,

    putting pressure on the

    ramp within the square hole.

    The wire clamp within the

    round hole will open.

    3) Insert the stripped end of the wire

    and remove the screwdriver.

    LINE

    GND

    24 5

  • Page 17:

    18

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    While the A/S2W SHM is ON, operating personnel are not exposed to more

    than 30 volts on any card or on any accessible area of the DC power supply.

    Nevertheless, never open the unit or try to maintain or reconfigure it while it is

    plugged in.

    The AC cord is fused at the rear panel of the unit. If this fuse blows, make sure

    you replace it only with a fuse rated for the required current and of the specified

    type (0.2-A slow-blow for ME375A-R2 and ME376A-R2, 0.1-A slow-blow for

    ME375AE-R2 and ME376AE-R2). An extra fuse should have been included with

    the unit. Until you replace a blown, damaged, or missing fuse, unplug the unit and

    make sure that no one attempts to use it. Avoid using repaired fuses, and never

    “get by” without the fuse by short-circuiting the fuse holders!

  • Page 18:

    19

    CHAPTER 4: Operation

    4. Operation

    This chapter lists the Async/Sync 2-Wire Short Haul Modem’s external controls

    and indicators, describes their functions, and describes operating procedures.

    Complete and confirm the installation procedures described in Chapter 3 before

    you attempt to operate the A/S2W SHM. If you have difficulty, refer to Chapter 5.

    4.1 The Front-Panel Controls and Indicators

    FIgure 4-1 below shows the front panel of the Async/Sync 2-Wire Short Haul

    Modem, including all of the controls and LED indicators mounted on it. These

    controls and indicators are described in Tables 4-1 and 4-2 on the next two pages.

    Fig. 4-1. The A/S2W SHM’s front panel.

  • Page 19:

    20

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    Table 4-1. Front-Panel Controls and Their Functions

    Control Function

    DIG Press this Local Digital Loopback button to cause the local A/S2W

    SHM to loop received data and clock signals from the line back

    out of its own transmitter. This is equivalent to activating remote

    digital loopback (see below) on the remote unit. Press this button

    again to terminate local digital loopback.

    ANA* Press this Local Analog Loopback button to cause the local

    A/S2W SHM to loop its transmitter output back into its own

    receiver. Press this button again to terminate local analog

    loopback. While the A/S2W SHM’s LLB jumper is set to EN

    (enabled—see the third part of Table 3-1 on page 15), you can

    also control this type of loopback by raising and lowering the LL

    signal from the DTE on the appropriate pin for your interface.

    REM* Press this Remote Digital Loopback button to cause the remote

    A/S2W SHM to loop received data and clock signals back out of

    its own transmitter. (Data Set Ready goes low when this

    happens.) Press this button again to terminate remote digital

    loopback. While the A/S2W SHM’s RLB jumper is set to EN

    (enabled—see the third part of Table 3-1 on page 15), you can

    also control this type of loopback by raising and lowering the RL

    signal from the DTE on the appropriate pin for your interface.

    PATT Press this Pattern button to cause the local A/S2W SHM to send

    the remote unit a continuous Bit Error Rate test pattern. Press this

    button again to stop sending the test pattern.

    RESET Carefully press a long thin object such as a tack or the end of a

    paper clip into this recessed switch to reset the A/S2W SHM. Do

    this to clear abnormal conditions (the indication of an error

    condition, for example) instead of unplugging the unit and plugging

    it back in.

    *The ANA and REM buttons are not affected by the settings of the RLB and

    LLB jumpers (see the third part of Table 3-1 on page 15). Even if those

    jumpers are set to DIS (disabled), you can still control loopback testing with

    these buttons.

  • Page 20:

    21

    CHAPTER 4: Operation

    Table 4-2. Front-Panel Indicators and Their Functions

    Indicator ITU-TSS Function

    (CCITT)

    Circuit

    PWR Green LED is steadily lit while power is present.

    RTS 105 Yellow LED is steadily lit while the Request to Send

    (RTS) signal from the DTE is high.

    TD 103 Yellow LED is steadily lit while the local A/S2W

    SHM transmits steady SPACE. It flickers while the

    local unit transmits data.

    RD 104 Yellow LED is steadily lit while the local A/S2W

    SHM receives steady SPACE. It flickers while the

    local unit receives data.

    DCD 109 Yellow LED is steadily lit while:

    a) The local and remote A/S2W SHMs are in sync,

    and the local unit’s DCD switch is set to “DCD”;

    b) The local and remote A/S2W SHMs are in sync,

    the local unit’s DCD switch is set to “CNT”, and the

    remote unit has RTS high.

    LOS Red LED is steadily lit when synchronization

    between the local and remote A/S2W SHMs is lost.

    ERR Red LED is steadily lit when the local A/S2W SHM’s

    PATT button is in the ON position (depressed) and

    the unit detects an error in the BERT pattern.

    TEST Yellow LED is steadily lit while the local A/S2W

    SHM’s internal BERT is active (the PATT button is

    depressed) or the unit is in any of the three

    loopback modes.

  • Page 21:

    22

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    4.2 Power-Up, Normal Operation, and Power-Down

    Making sure that you follow the guidelines in Section 3.4, power up the

    Async/Sync 2-Wire Short Haul Modem by plugging its AC power cord to an

    working AC outlet. (The unit has no power switch. To power it down, unplug it.)

    The PWR LED should light, indicating that the unit is on.

    If the local and remote A/S2W SHM units are both operating and transmitting

    data, the units’ front-panel indicators should look like this:

    PWR Steadily lit

    TD Steadily lit or flickering depending on the data being transmitted.

    RD Steadily lit or flickering depending on the data being received.

    RTS Steadily lit or dark depending on the status of the RTS signal from the

    local DTE.

    DCD If the local unit’s DCD jumper is set to DCD, steadily lit; if the local unit’s

    DCD jumper is set to CNT, steadily lit or dark depending on the status

    of the RTS signal from the remote unit.

    LOS Flashing until the units synchronize with each other, then dark.

    ERR Flashing until the units synchronize with each other, then dark.

    TEST Flashing until the units synchronize with each other, then dark.

    If the LEDs don’t look like this, make sure that:

    • One A/S2W SHM’s CLOCK jumper is set to internal (INT) or external (EXT)

    clock, and the other unit’s CLOCK jumper is set to loopback (LBT) clock.

    • Both units’ four front-panel pushbuttons are in the OFF position (not

    depressed).

    Once a A/S2W SHM begins operating normally, it will continue to do so

    indefinitely without needing to be attended, except when occasional monitoring of

    LED indicators is required. If you have difficulty, perform the diagnostic tests

    described in Section 5.1. If you still can’t solve the problem, call Black Box as

    described in Section 5.2.

  • Page 22:

    23

    CHAPTER 4: Operation

    4.3 Reconfiguration

    If it becomes necessary to reconfigure your A/S2W SHMs for a different type of

    operation, you will have to reposition the units’ internal controls. (If you don’t feel

    comfortable about doing this yourself, get an experienced technician to do it or to

    help you.) Take these steps:

    1. Unplug the local unit and temporarily detach the data cables from it.

    3. Open the unit’s cover.

    4. Referring to Figure 3-1 on page 12 and Table 3-1 on pages 13 through 15, set

    the unit’s internal controls to suit the new application.

    5. Close the cover.

    6. Perform Steps 1 through 5 at the remote site.

    7. Reattach the data cables to both units and plug both units back in.

    The A/S2W SHMs should begin operating with their new parameters. If there are

    problems, make sure that both units are set correctly. If they are, perform the

    diagnostic tests described in Section 5.1. If you still can’t solve the problem, call

    Black Box as described in Section 5.2.

  • Page 23:

    24

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    5. Troubleshooting

    5.1 Diagnostic Testing

    If you have problems with data communication on your Async/Sync 2-Wire Short

    Haul Modem system, or if you just want to verify proper system operation, the

    A/S2W SHM has diagnostic capabilities that can help you. You can use the A/S2W

    SHM’s front-panel pushbuttons to control different kinds of tests with which you

    can quickly check the A/S2W SHM, the attached cables (including the

    transmission line), and the local DTE. By performing these tests, you can quickly

    find out which components of your A/S2W SHM system are operating properly

    and which aren’t.

    Before you begin testing, make sure that both of the A/S2W SHMs and both

    DTEs are powered up and configured normally. When you have verified this,

    perform the tests described in Sections 5.1.1, 5.1.2, and 5.1.3, in that order.

    5.1.1 L

    OCAL

    A

    NALOG

    L

    OOPBACK

    Use this test to check the performance of the local modem, the local DTE, and the

    cables between them. Perform this test separately at both the local and remote sites

    (refer to Figure 5-1 on the next page). Take these steps:

    1. Push the local A/S2W SHM’s ANA (Local Analog Loopback) button or (if the

    unit’s LLB jumper is set to EN) raise the LL signal from the DTE to the unit.

    The unit should light its TEST LED as it internally connects its transmitter

    output to its own receiver circuits.

    2. Verify that the DTE is operating properly and can be used for a test. If the

    DTE is malfunctioning, replace it or have it repaired.

    3. Observe what happens to test data that you send and get back: Set the DTE to

    half duplex and get an “echo” through the system and/or use special Bit

    Error Rate Test (BERT) equipment.

  • Page 24:

    25

    CHAPTER 5: Troubleshooting

    Fig. 5-1. Local analog loopback.

    4. If you use a BERT unit and it indicates an error, make sure the cables

    connecting it to the A/S2W SHM are securely connected. If they are, try

    swapping in known-good cables. If the error goes away, the problem was

    probably in the old cables. Otherwise, the A/S2W SHM is probably faulty; call

    Black Box for technical support.

    If you use a BERT unit and it indicates all clear, but you get errors when

    you perform the DTE test, the DTE is probably the source of the problem.

    Make sure that it is physically intact and that it is configured correctly. Refer

    to your DTE’s manual if necessary, and if you can’t solve the problem, call

    your DTE’s supplier.

    If you don’t have a BERT unit, and the DTE test indicates an error, make

    sure the cables connecting the DTE to the A/S2W SHM are securely

    connected. If they are, try swapping in known-good cables. If the error goes

    away, the problem was probably in the old cables. Otherwise, the DTE is

    probably the source of the problem. Make sure that it is physically intact and

    that it is configured correctly. Refer to your DTE’s manual if necessary, and if

    you can’t solve the problem, call your DTE’s supplier.

    5. After completing the test (or when the fault has been corrected), return the

    ANA button to the OFF position by pushing it again or, if you’re controlling

    the test electronically, lower the LL signal from the DTE to the unit.

    6. Repeat Steps 1 through 5 at the remote site.

    Proceed with the Remote Digital Loopback test.

    DATA

    TERMINAL

    CLK

    DATA

    DATA

    CLK

    XMTR

    RCVR

    LINE

  • Page 25:

    26

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    5.1.2 R

    EMOTE

    D

    IGITAL

    L

    OOPBACK

    Use this test to determine how the line-side circuits of the local and remote A/S2W

    SHMs and the 2-wire line between them are performing:

    1. Push the local unit’s REM (Remote Digital Loopback) pushbutton or (if the

    unit’s RLB jumper is set to EN) raise the RL signal from the DTE to the unit.

    The TEST LED should light on both units as the local unit sends a remote-

    loopback command to the remote unit and the remote unit internally

    connects its receiver input to its transmitter output (see Figure 5-2 below).

    2. Perform a DTE test and/or BERT as described in Step 3 of the Local Analog

    Loopback procedure. You can also press the local unit’s PATT button to have

    it send a test pattern through the loop. (Press the PATT button again to stop

    the test pattern.)

    3. If Step 2 indicates a fault, but Local Analog Loopback testing was successful

    for both A/S2W SHMs, either the line connection between the units is faulty,

    or the 2-wire line circuits inside one or both of the units are not operating

    properly. If possible, try a different line. If this is impossible, or if the problem

    does not go away when you use a different line, call Black Box for technical

    support.

    4. After completing the test (or when the fault has been corrected), return the

    REM button to the OFF position by pushing it again or, if you’re controlling

    the test electronically, lower the RL signal from the DTE to the unit.

    Proceed with the Local Digital Loopback test.

    Fig. 5-2. Remote digital loopback.

    LOCAL

    DATA

    TERMINAL

    REMOTE

    DATA

    TERMINAL

    RLB active

    DATA

    CLK

    XMTR

    XMTR

    RCVR

    RCVR

    CLK

    DATA

  • Page 26:

    27

    CHAPTER 5: Troubleshooting

    5.1.3 L

    OCAL

    D

    IGITAL

    L

    OOPBACK

    This test is essentially the same as the Remote Digital Loopback test, but

    performed “in reverse,” so to speak. It allows you to make doubly sure of the line

    and the A/S2W SHMs’ line-side circuitry by setting up a loop in the opposite

    direction. Take these steps:

    1. Push the local unit’s DIG (Local Digital Loopback) pushbutton. (There is no

    way to initiate this test electronically.) The TEST LED should light on both

    units as the local unit sends a local-loopback notification to the remote unit

    and then internally connects its receiver input to its transmitter output (see

    Figure 5-3 below).

    2. The operator at the remote site can test the units and the lines and take

    remedial action as described in Steps 2 and 3 of the Remote Digital Loopback

    procedure.

    3. When the operator at the remote site notifies you that he or she has finished,

    return the DIG button to the OFF position by pushing it again.

    If you have been unable to solve the problem, call Black Box for technical support

    as described in the next section.

    Fig. 5-3. Local digital loopback.

    REMOTE

    DATA

    TERMINAL

    LOCAL

    DATA

    TERMINAL

    DIG active

    DATA

    CLK

    XMTR

    XMTR

    RCVR

    RCVR

    CLK

    DATA

  • Page 27:

    28

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    5.2 Calling Black Box

    If you determine that your Async/Sync 2-Wire Short Haul Modem is

    malfunctioning, do not attempt to alter or repair it. It contains no user-serviceable

    parts. Contact Black Box Technical Support at 724-746-5500; the problem might be

    solvable over the phone.

    Before you do, make a record of the history of the problem. We will be able to

    provide more efficient and accurate assistance if you have a complete description,

    including:

    • The nature and duration of the problem.

    • When the problem occurs.

    • The components involved in the problem.

    • Any particular application that, when used, appears to create the problem or

    make it worse.

    • The results of any testing you’ve already done.

    5.3 Shipping and Packaging

    If you need to transport or ship your Async/Sync 2-Wire Short Haul Modem:

    • Package it carefully. We recommend that you use the original container.

    • Before you ship a unit for repair or return, contact Black Box to get a Return

    Materials Authorization (RMA) number, and make sure you include

    everything you received with the unit when you ship it.

  • Page 28:

    ITU-TSS EIA Signal Name/ ITU-TSS Signal Name/ Description

    (CCITT) RS-232 Abbreviation for V.35 Abbreviation for

    V.24 Pin EIA RS-232 Pin(s) ITU-TSS V.35

    Circuit (ME375) (ME375) (ME376) (ME376)

    101 1 Protective Ground A Frame Ground (FGND) Chassis ground. May be

    (PGND) connected to or isolated

    from Signal Ground by

    setting the GROUND

    jumper.

    102 7 Signal Ground (SGND) B Signal Ground (SGND) Signal ground. May be

    connected to or isolated

    from Protective/Frame

    Ground by setting the

    GROUND jumper.

    103 2 Transmit Data (TD) P Send Data A (SD A) Serial digital data received

    S Send Data B (SD B) from the DTE. In

    synchronous applications,

    the data transitions must

    occur on the rising edge of

    the transmit clock.

    104 3 Receive Data (RD) R Receive Data A (RD A) Serial digital data sent to

    T Receive Data B (RD B) the DTE. In synchronous

    applications, the data

    transitions occur on the

    rising edge of the clock.

    105 4 Request to Send (RTS) C Request to Send (RTS) The DTE raises this signal

    to the A/S2W SHM when it

    wants to transmit data.

    106 5 Clear to Send (CTS) D Clear to Send (CTS) The A/S2W SHM raises

    this signal to the DTE

    when it is ready to receive.

    29

    APPENDIX: Pinouts

    Appendix: Pinouts

    The table below and on the following pages describes the leads and signals

    supported by the two models of the Async/Sync 2-Wire Short Haul Modem.

  • Page 29:

    30

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    ITU-TSS EIA Signal Name/ ITU-TSS Signal Name/ Description

    (CCITT) RS-232 Abbreviation for V.35 Abbreviation for

    V.24 Pin EIA RS-232 Pin(s) ITU-TSS V.35

    Circuit (ME375) (ME375) (ME376) (ME376)

    107 6 Data Set Ready (DSR) E Data Set Ready (DSR) If DIP Switch Position 7 is

    set to DSR, the A/S2W

    SHM holds this signal high

    unless it is in digital

    loopback or receives a

    remote-loopback signal

    from the remote unit.

    If DIP Switch Position 7

    is set to DTR, the A/S2W

    SHM lets this signal follow

    (reflect) the remote unit’s

    DTR.

    108.2 20 Data Terminal Ready H Data Terminal Ready The DTE raises this signal

    (DTR) (DTR) when it is ready to transmit

    or receive. If the remote

    unit’s DIP Switch Position

    7 is set to DTR, the remote

    unit’s DSR will follow

    (reflect) this signal.

    109 8 Received Line Signal F Received Line Signal More commonly known as

    Detector (RLSD) Detector (RLSD) Data Carrier Detect (DCD).

    The A/S2W SHM holds

    this signal high unless

    RTS goes low or carrier is

    lost.

    113 24 Transmitter Signal U Serial Clock Transmit More commonly known as

    Element Timing [DTE] Exetrnal A (SCTE A) External Clock (EXC). The

    (TSETT) W Serial Clock Transmit DTE sends this data-rate

    External B (SCTE B) clock signal to the A/S2W

    SHM, which in turn passes

    it to the remote unit. The

    A/S2W SHM derives its

    sync clock from this signal

    only if its CLOCK jumper is

    set to EXT. Positive clock

    transitions correspond to

    positive data transitions.

  • Page 30:

    31

    APPENDIX: Pinouts

    ITU-TSS EIA Signal Name/ ITU-TSS Signal Name/ Description

    (CCITT) RS-232 Abbreviation for V.35 Abbreviation for

    V.24 Pin EIA RS-232 Pin(s) ITU-TSS V.35

    Circuit (ME375) (ME375) (ME376) (ME376)

    114 15 Transmitter Signal Y Serial Clock Transmit A More commonly known as

    Element Timing [DCE] (SCT A) Transmit Clock (TXC). The

    (TSETC) AA Serial Clock Transmit B A/S2W SHM sends this

    (SCT B) data-rate clock signal to

    the DTE and the remote

    unit. The A/S2W SHM

    derives its sync clock from

    this signal only if its

    CLOCK jumper is set to

    INT. Positive clock

    transitions correspond to

    positive data transitions.

    115 17 Receiver Signal V Serial Clock Receive A More commonly known as

    Element Timing [DCE] (SCR A) Receive Clock (RXC). The

    (RSETC) X Serial Clock Receive B remote A/S2W SHM sends

    (SCR B) this data-rate clock signal

    to the lccal unit, which in

    turn passes it to the DTE.

    The A/S2W SHM derives

    its sync clock from this

    signal only if its CLOCK

    jumper is set to LBT.

    Positive clock transitions

    correspond to positive

    data transitions.

    140 21 Remote Loopback (RL) HH Remote Loopback (RL) The DTE raises this signal

    to the A/S2W SHM to

    cause it to begin and

    maintain remote digital

    loopback (V.54 Loop 2).

    The A/S2W SHM ignores

    this signal unless its RLB

    jumper is set to EN.

    141 18 Local Loopback (LL) JJ Local Loopback (LL) The DTE raises this signal

    to the A/S2W SHM to

    cause it to begin and

    maintain local analog

    loopback (V.54 Loop 3).

    The A/S2W SHM ignores

    this signal unless its LLB

    jumper is set to EN.

  • Page 31:

    32

    ASYNC/SYNC 2-WIRE SHORT-HAUL MODEMS

    ITU-TSS EIA Signal Name/ ITU-TSS Signal Name/ Description

    (CCITT) RS-232 Abbreviation for V.35 Abbreviation for

    V.24 Pin EIA RS-232 Pin(s) ITU-TSS V.35

    Circuit (ME375) (ME375) (ME376) (ME376)

    142 25 Test Mode (TM) KK Test Mode (TM) The A/S2W SHM raises

    this signal during any test

    and any time its internal

    BERT is activated (the

    PATT button is

    depressed).

  • Page 32:

    33

    LEGAL INFORMATION

    DISCLAIMERS

    No representation for fitness of this product for any purpose other than those

    specifically mentioned in this manual is made either by the manufacturer or its

    agents.

    The manufacturer shall not be liable for any direct, indirect, special, incidental,

    or consequential damages, whether based on contract, tort, or any legal theory.

    RESERVED RIGHTS

    This document contains materials protected by copyright, including information

    belonging to the manufacturer. All rights are reserved. No part of this manual may

    be reproduced or transmitted in any form, by any means or for any purpose,

    without express written consent.

    The manufacturer and its agents reserve the right to revise this publication or

    make changes without obligation to notify any person of such revisions or changes.

  • Page 33:

    NOTES

  • Page 34:

    1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746

    ©Copyright 1998. Black Box Corporation. All rights reserved.

DOC-12fb07e6:

Recommended:

FDBB2040FS1, 58PAV, L655-S5146, AB 2, VCU10P, S111 BT, FES300ASC, BCGL0030
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