Black Box TL304A Manual de usuario

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)

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Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

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

CUSTOMER

SUPPORT

INFORMATION

SEPTEMBER 1998

TL304A

TL305A

PSD-4

PSD-8

FCC STATEMENT

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

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 B 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 Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques

de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

PSD-4 AND PSD-8

INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)

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 aparato 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.

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.

TRADEMARKS

TRADEMARKS USED IN THIS MANUAL

AS/400 is a registered trademark of International Business Machines Corporation.

Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

PSD-4 AND PSD-8

1. Specifications

Number of Sub-Channels —

PSD-4: 4

PSD-8: 8

Channel Configuration —

Lowest Priority: Sub-channel 1

Highest Priority: PSD-4: Sub-channel 4

PSD-8: Sub-channel 8

Sub-Channel Selection — RTS/DCD on or data transitions (strap-selectable)

Sub-Channel Deselection — RTS/DCD off or 16 bits of idle data (strap-selectable)

Sub-Channel Dialing —

Manual: Press in the front-panel pushbutton switch

Automatic: If a sub-channel stays connected for more than a pre-set period of time

(strap-selectable—1.7, 13.5, or 108), the PSD automatically disables it

Clock Source — Internal, external from main channel, or external from sub-channel 1

Data Rates —

Asynchronous: Up to 19.2 kbps

Synchronous: Internal Clock: 1.2, 2.4, 4.8, 7.2, 9.6, 14.4, or 19.2 kbps

External Clock: Up to 19.2 kbps

Connectors — IEIA RS-232-C/CCITT V.24; DCE or DTE (strap-selectable)

Controls — Front-panel SUB-CHANNEL DISABLE pushbutton switch for each sub-channel; rear-panel

POWER rocker switch; rear-panel 110/220 VAC selector

LED Indicators — POWER: Lights when the unit is receiving AC power

DATA: Lights when data is broadcast from the main channel

to the sub-channels

ACTIVITY: Lights when the sub-channel accesses the main channel

AUTOMATIC: Lights when sub-channel has been automatically disabled

Temperature — 32 to 122°F (0 to 50°C)

Humidity — 30 to 90%, non-condensing

Power — 110/220 VAC switchable + 10%

Size — I1.7"H x 17"W x 8.2"D (4.3 x 43.1 x 20.8 cm)

Weight — 4.4 lb (2.0 kg)

CHAPTER 2: Introduction

2. Introduction

The Programmable Sharing Device enables up to 4 (TL304A) or 8 (TL305A) modems or terminals to share

a master modem, multiplexor, or computer port in an asynchronous or synchronous multipoint environment.

(Asynchronous and synchronous equipment cannot be mixed on the same PSD.)

MAIN CHANNEL

The main channel transmits information to all sub-channels in parallel.

SUB-CHANNELS

Sub-channels contend to transmit to the main channel by activating RTS/DCD (Request to Send/Data Carrier

Detect) or by data transitions (strap-selectable). When the sub-channel is active, the sub-channel’s transmit data

and control signals are connected to the main channel. When RTS/DCD drops, data transitions stop, or 16 idle

bits are received, the PSD will disconnect and monitor other sub-channels.

Sub-channels can be disabled either manually by front-panel pushbuttons or automatically. If a sub-channel

is streaming and staying active for longer than a configured amount of time, the PSD will automatically disable

that sub-channel. A front-panel LED will illuminate to indicate that the sub-channel has been automatically

disabled. The sub-channel will be reset when RTS/DCD drops or 16 idle bits are transmitted to it from the

attached device.

CLOCK MODES

Three clock modes are supported: internal, external from the main channel, or external from sub-channel 1.

BUFFER

A built-in-buffer compensates for phase differences between the clocks of modems connected to the sub-

channels and the PSD main-channel transmit clock.

An extra-buffer option on the PSD-8 can be activated when the PSD is connected to equipment that cannot

accept an external clock. Examples include DDs (United States) or other digital lines and modems that cannot

be set to an external clock. This additional buffer compensates for phase differences between the PSD clock

and sub-channel clock(s).

Figure 1. The Programmable Sharing Device allows multiple devices to share a master port.

RS-232 Cable

Modem

CSU/DSU

PSD-4

AS/400®

Dialup Line

Leased Line

Modem

CSU/DSU

Controllers

PSD-4 AND PSD-8

3. Installation

3.1 Choosing a Site

• The PSD must be installed within five feet (1.5 m) of a grounded AC outlet.

• The PSD must be within 50 feet (15 m) of the equipment that will be attached to the main channel and

each sub-channel.

• Allow 36 inches (91 cm) frontal clearance for operating and maintenance accessibility.

• Allow four inches (10 cm) rear-panel clearance for the power and interface cables.

• Side-panel brackets can be used to install the unit in a 19" rack. (The brackets can be removed without

harming the PSD.)

3.2 Configuring the PSD Printed Circuit Board

Table 1 on the following page explains each of the configurable jumpers or switches on the PSD printed circuit

board. Figures 3 and 4 show the locations of each of the jumpers and switches for the PSD-4 and PSD-8.

There are two EXT. BUFFER switches on the PSD-8. These are extra buffers—not external buffers. Use the

extra buffers when the PSD is connected to equipment that cannot accept an external clock from the PSD.

The extra buffers compensate for phase differences between clocks. There are many applications where this

might be necessary, but one example would be where multiple CSU/DSUs (each attached to its own leased

line that provides clocking) are connected to the PSD.

Switch S1 controls the buffer for sub-channels 1 through 4, and switch S2 controls the buffer for sub-channels 5

through 8.

Figure 2. The front panels of the PSD-4 (top) and the PSD-8 (bottom).

POWER:

Lights when

the unit is

receiving

AC power

DATA:

Lights when

data is broadcast

from the main

channel to the

sub-channels

ACTIVITY:

Lights when the

sub-channel

accesses the

main channel.

AUTOMATIC:

Lights when sub-

channel has been

automatically

disabled.

SUB-CHANNEL

DISABLE:

Press in the push button

to manually disable a

sub-channel.

CHAPTER 3: Installation

Table 1. Printed Circuit-Board Switch and Strap Settings

Possible Factory

Stap Identity Location Settings Setting Function

MAIN DCE/DTE switch DTE DTE Determines the PSD’s Main Channel

DCE interface as either DTE (straight connection

to a modem) or as DCE (straight connection

to a computer or terminal).

Sub-channel DTE DTE Determines the PSD’s sub-channel interface

DCE/DTE switches DCE as either DTE or DCE.

DATA RATE (kbps) BR1 19.2 9.6 Selects the PSD’s internal data rate or external

(rotary switch) 14.4 clock from sub-channel 1.

9.6

7.2

4.8 NOTE: When using CLK 1 mode, the main

2.4 channel cannot be connected to a modem

1.2 working in internal clock.

CLK 1

Chas. GND J1 CONNECT DISCONNECT The CONNECT setting connects signal ground

DISCONNECT to chassis ground. The DISCONNECT setting

isolates them.

PIN 24 DIS J1A ENABLE ENABLE Exits main channel when PIN 24 is disabled.

(jumpered)

DISABLE

(NO jumper)

TIME OUT J2 1.7 108 Selects the time-out period (in seconds) after

13.5 which the PSD will automatically disable the

108 sub-channel. Selecting DISABLE will stop

DISABLE the PSD from automatically disabling any

sub-channels.

CONTENTION J5 RTS RTS Determines the sub-channel selection and

DATA deselection.

FORMAT J6 ASYNC SYNC Selects the data format.

SYNC

CLOCK J7 NORMAL NORMAL Determines the source of the clock for

FROM EXT DTE synchronous data. Set to NORMAL for

internally derived clock. Set to FROM EXT

DTE for externally dermined clock from a

connected DTE.

EXT. BUFFER S1 ON OFF Activates or deactivates the extra buffer.

(PSD-8 only) S2 OFF

PSD-4 AND PSD-8

Figure 3. The Printed Circuit Board of the PSD-4.

Figure 4. The Printed Circuit Board of the PSD-8.

CHAPTER 3: Installation

3.3 System Synchronization

ASYNCHRONOUS MODE

Strap the J6 jumper over the ASYNC pins. All attached equipment must be asynchronous. Turn the BIT RATE

rotary switch (BRI) to the correct system speed. No other adjustments to the PSD are necessary.

SYNCHRONOUS MODE

Strap the J6 jumper over the SYNC pins (this is the factory-default setting). All attached equipment must be

synchronous. There are four ways to synchronize the system:

1. Synchronization on the PSD’s internal clock.

• Main channel: Equipment attached to the main channel should be set to external clock.

• Sub-channel: Equipment attached to the sub-channels should be set to external clock.

• BIT RATE rotary switch: Set BRI to the correct system speed.

2. Synchronization on the equipment attached to the main channel.

• Main channel: Equipment attached to the main channel should be set to internal clock.

• Sub-channels: Equipment attached to the sub-channels should be set to external clock.

• BIT RATE rotary switch: Set BRI to the correct system speed.

• Jumper J7: If the equipment attached to the main channel is DCE, strap to NORMAL. If the equipment is

DTE, strap to FROM EXT DTE.

3. Synchronization on the equipment attached to sub-channel 1.

• Main channel: Equipment attached to the main channel should be set to external clock.

• Sub-channel 1: Equipment attached to sub-channel 1 should be set to internal clock.

• Sub-channel 2 through 8: Equipment attached to the sub-channels 2 through 8 should be set to external

clock.

• BIT RATE rotary switch: Set BRI to position 7 (CLK1).

• Jumper J7: If the equipment attached to the sub-channel 1 is DCE, strap to NORMAL. If the equipment

is DTE, strap to FROM EXT DTE.

NOTE: Synchronization on sub-channel 1 is not recommended when the device attached to sub-channel

1 operates in switched carrier mode. This will cause fluctuations in clock frequency and phase.

4. Synchronization on equipment attached to any sub-channel (PSD-8 only).

• Main channel: Equipment attached to the main channel can be set to internal or external clock.

• Sub-channels: Equipment attached to the sub-channels can be set to internal or external clock.

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