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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)
CUSTOMER
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
SUPPORT
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
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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, whi
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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 el
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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
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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
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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
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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 b
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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 r
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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
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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 cloc
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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
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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
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PSD-4 AND PSD-8 POWER: 110/220 VAC Selector: SCREWS: FUSE Align either 110 or 220 Loosen these screws to take Rocker switch to turn AC with the arrow. off the cover of the PSD. power on or off Figure 5. The back panels of the PSD-4 (top) and the PSD-8 (bottom). 12
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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-channel’s DTR (
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PSD-4 AND PSD-8 Figure 6. Main Channel DTE with Sub-Channel DCE. Figure 7. Main Channel DTE with Sub-Channel DTE. 14
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CHAPTER 5: Technical Guide Figure 8. Main Channel DCE with Sub-Channel DCE. Figure 9. Main Channel DCE with Sub-Channel DTE. 15
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© Copyright 1998. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746
