Black Box Computer Hardware PSD 8 User Manual

SEPTEMBER 1998  
TL304A  
TL305A  
PSD-4  
PSD-8  
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)  
FREE technical support 24 hours a day, 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  
CUSTOMER  
SUPPORT  
INFORMATION  
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.  
2
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.  
3
PSD-4 AND PSD-8  
1. Specifications  
Number of Sub-Channels —  
PSD-4:  
PSD-8:  
4
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:  
Synchronous:  
Up to 19.2 kbps  
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:  
DATA:  
Lights when the unit is receiving AC power  
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)  
4
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-channels 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).  
RS-232 Cable  
RS-232 Cable  
Controllers  
Modem  
Modem  
Modem  
Modem  
Dialup Line  
PSD-4  
Leased Line  
Leased Line  
AS/400®  
CSU/DSU  
CSU/DSU  
Figure 1. The Programmable Sharing Device allows multiple devices to share a master port.  
5
PSD-4 AND PSD-8  
3.1 Choosing a Site  
3. Installation  
• 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.  
POWER:  
Lights when  
the unit is  
receiving  
DATA:  
Lights when  
data is broadcast  
from the main  
channel to the  
sub-channels  
ACTIVITY:  
Lights when the  
sub-channel  
accesses the  
main channel.  
SUB-CHANNEL  
DISABLE:  
Press in the push button  
to manually disable a  
sub-channel.  
AUTOMATIC:  
Lights when sub-  
channel has been  
automatically  
disabled.  
AC power  
Figure 2. The front panels of the PSD-4 (top) and the PSD-8 (bottom).  
6
CHAPTER 3: Installation  
Table 1. Printed Circuit-Board Switch and Strap Settings  
Possible  
Settings  
Factory  
Setting  
Stap Identity  
Location  
Function  
MAIN DCE/DTE switch  
DTE  
DCE  
DTE  
Determines the PSD’s Main Channel  
interface as either DTE (straight connection  
to a modem) or as DCE (straight connection  
to a computer or terminal).  
Sub-channel  
DCE/DTE switches  
DTE  
DCE  
DTE  
9.6  
Determines the PSD’s sub-channel interface  
as either DTE or DCE.  
DATA RATE (kbps)  
(rotary switch)  
BR1  
19.2  
14.4  
9.6  
Selects the PSD’s internal data rate or external  
clock from sub-channel 1.  
7.2  
4.8  
2.4  
1.2  
NOTE: When using CLK 1 mode, the main  
channel cannot be connected to a modem  
working in internal clock.  
CLK 1  
Chas. GND  
PIN 24 DIS  
J1  
CONNECT  
DISCONNECT  
DISCONNECT The CONNECT setting connects signal ground  
to chassis ground. The DISCONNECT setting  
isolates them.  
J1A  
ENABLE  
(jumpered)  
DISABLE  
ENABLE  
Exits main channel when PIN 24 is disabled.  
(NO jumper)  
TIME OUT  
J2  
1.7  
13.5  
108  
108  
Selects the time-out period (in seconds) after  
which the PSD will automatically disable the  
sub-channel. Selecting DISABLE will stop  
the PSD from automatically disabling any  
sub-channels.  
DISABLE  
CONTENTION  
FORMAT  
J5  
J6  
J7  
RTS  
DATA  
RTS  
SYNC  
Determines the sub-channel selection and  
deselection.  
ASYNC  
SYNC  
Selects the data format.  
CLOCK  
NORMAL  
FROM EXT DTE  
NORMAL  
Determines the source of the clock for  
synchronous data. Set to NORMAL for  
internally derived clock. Set to FROM EXT  
DTE for externally dermined clock from a  
connected DTE.  
EXT. BUFFER  
(PSD-8 only)  
S1  
S2  
ON  
OFF  
OFF  
Activates or deactivates the extra buffer.  
7
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.  
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 PSDs 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.  
9
PSD-4 AND PSD-8  
• BIT RATE rotary switch: Set BRI to the correct system speed.  
• EXT. BUFFER: If any of the devices connected to the sub-channels numbered 1 through 4 are set to  
internal clock, then switch S1 should be ON. If any of the devices connected to the sub-channels numbered  
5 through 8 are set to internal clock, then switch S2 should be ON.  
• 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.  
3.4 AC Power  
On the rear panel of your unit, locate the 110/ 220 VAC selector. Set the selctor to match your main power  
source.  
After configuration is complete and the cover to the unit is replaced, plug the power cord into the PSD. Plug  
the other end into a grounded AC power jack.  
NOTE: There is a 0.25A slow-blow fuse in your unit. Do not replace this fuse with a repaired fuse.  
Do not short-circuit the fuse holder.  
Turn the POWER rocker switch on.  
10  
CHAPTER 4: Operation and Troubleshooting  
4. Operation and Troubleshooting  
4.1 Operation  
Turn on the rear-panel POWER rocker switch. The front-panel POWER LED will light.  
The PSD operates automatically. Except for manually disabling a sub-channel, you will not need  
to attend to the PSD.  
4.2 Changing Setting During Operation  
If you have to reconfigure the PSD for a different type of operation, turn off the PSD and unplug it from its AC  
power source before taking off the cover to change settings.  
4.3 Troubleshooting  
POWER SUPPLY  
If the unit is attached to an AC power source and the green Power LED does not light up, check the following:  
• Make sure the rear-panel rocker switch is on and is lit.  
Verify that the 110/ 220 selector is set correctly.  
• Unplug the unit and check the fuse (see Figure 5 for location of the fuse).  
• Remove the top cover and verify that the 4-pin power connector is attached to the transformer on the  
printed circuit board (PSD-8 only).  
PSD MALFUNCTION  
If the Power LED is lit, but the PSD is not functioning, unplug your unit. Take off the cover and check the  
following:  
Verify that all the DCE/ DTE switches are set according to the data-system requirements.  
• Double-check each of your strap settings.  
• Visually inspect the large chips labeled RJ-006. Make sure that they are securely attached to the printed  
circuit board.  
11  
PSD-4 AND PSD-8  
110/220 VAC Selector:  
Align either 110 or 220  
with the arrow.  
SCREWS:  
Loosen these screws to take  
off the cover of the PSD.  
POWER:  
Rocker switch  
to turn AC  
FUSE  
power on or off  
Figure 5. The back panels of the PSD-4 (top) and the PSD-8 (bottom).  
12  
CHAPTER 5: Technical Guide  
5. Technical Guide  
5.1 Control Signals  
MAIN CHANNEL CONTROL SIGNALS  
RTS (DCD)  
• In RTS/ DCD contention mode: follows RTS (DCD) of the selected sub-channels.  
• In Data Contention mode: ON if one of the sub-channels RTS (DCD) is ON.  
CTS  
On only when the CTS signals of all active sub-channels are ON. A sub-channel is active if it is  
connected to a modem and the DSR signal is ON (enables connection of dialup modems to the PSD).  
DSR (DTR)  
ON if one of the sub-channels DTR (DSR) is ON.  
SUB-CHANNEL CONTROL SIGNALS  
RTS (DCD)  
• Follows the main channel RTS (DCD) (unless the sub-channel is disabled).  
CTS  
• In RTS contention mode: selected sub-channel follows DTS signal of main channel.  
• In Data Contention mode: sub-channel receives CTS from main channel immediately after it raises  
RTS (unless the sub-channel is disabled).  
DSR (DTR)  
Follows the main channel DSR (DTR).  
5.2 Block Diagrams  
Figures 6 through 9 illustrate the flow of data and control signals in the PSD, in different DTE/ DCE  
configurations:  
Main  
Channel  
Sub-  
Channel  
Figure  
Number  
Configuration  
Configuration  
6
7
8
9
DTE  
DTE  
DCE  
DCE  
DCE  
DTE  
DCE  
DTE  
13  
PSD-4 AND PSD-8  
Figure 6. Main Channel DTE with Sub-Channel DCE.  
Figure 7. Main Channel DTE with Sub-Channel DTE.  
14  
CHAPTER 5: Technical Guide  
Figure 8. Main Channel DCE with Sub-Channel DCE.  
Figure 9. Main Channel DCE with Sub-Channel DTE.  
15  
© Copyright 1998. Black Box Corporation. All rights reserved.  
1000 Park Drive Lawrence, PA 15055-1018 724-746-5500  
Fax 724-746-0746  

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