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Telenetics 2185 User Manual

2185 digital bridge
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Telenetics
2185 Digital Bridge
User Guide

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Summary of Contents for Telenetics 2185

  • Page 1 Telenetics 2185 Digital Bridge User Guide...

  • Page 2: Proprietary Material

    Information and software in this document are proprietary to Telenetics Corporation (or its Suppliers) and without the express prior permission of an officer of Telenetics Corporation, may not be copied, reproduced, disclosed to others, published, or used, in whole or in part, for any pur- pose other than that for which it is being made available.
  • Page 3 Notice (cont’d) Warning This equipment does not exceed the Class A limits for radio noise interference emissions from digital apparatus as specified in the radio interference regulations of the Canadian Department of Communications.

  • Page 5: Table Of Contents

    Anti-Streaming ... 1-3 APPLICATIONS ... 1-3 Port-Sharing Mode ... 1-4 Modem-Sharing Mode ... 1-5 Co-Located Terminals ... 1-6 Cascading the 2185 ... 1-6 Specifications ... 1-9 Chapter 2, Installation INTRODUCTION ... 2-1 CUSTOMER RESPONSIBILITIES ... 2-1 Site Selection and Preparation ... 2-1 Unpacking ...
  • Page 6 Returning Defective Equipment for Repair ... 4-2 General Packing Information ... 4-2 Installations in the USA ... 4-2 Installations Outside the USA or Canada ... 4-3 Chapter 5, Ordering Information Introduction ... 5-1 Ordering Information ... 5-1 Glossary Index Telenetics 2185...

  • Page 7: Chapter 1, Introduction

    Chapter 1 Introduction INTRODUCTION Your Telenetics 2185 is a digital bridge that can connect up to five sub- channel devices to a single main channel device. Sharing computer and communications resources through a 2185 can achieve significant sav- ings in hardware and line costs.

  • Page 8: Main Channel Broadcast

    Subchannels contend for use of the main channel to send data to the CPU, controller, or other device. If more than one subchannels attempts to gain access to the main channel at one time, the 2185 selects one sub- channel and blocks data from all others. Subchannel contention reduces the garbling of data during network failure conditions.

  • Page 9: Anti-Streaming

    You may disable anti-streaming with a front panel switch. APPLICATIONS The 2185 is used in multipoint networks made up of a controller and polled terminals. The controller inserts terminal address codes and the terminals must be able to respond to their own address code. The 2185 arbitrates if two or more terminals try to transmit simultaneously.

  • Page 10: Port-Sharing Mode

    Port-Sharing Mode In the port-sharing mode, the 2185's main channel is connected directly to a CPU or controller port (DTE). Subchannel devices communicate with the 2185 via modem links. Figure 1-1 shows a typical port-sharing application. Figure 1-1. Port-Sharing Application...

  • Page 11: Modem-Sharing Mode

    Modem-Sharing Mode In the modem-sharing mode, the CPU or controller is at a site remote from the 2185. The 2185's main channel connects to the CPU through a modem link (DCE). Subchannel terminals are connected directly to the 2185. Modem-sharing operation is illustrated in Figure 1-2.

  • Page 12: Co-Located Terminals

    Figure 1-3. Co-Located Terminals Application Cascading the 2185 The 2185 can be cascaded to increase the number of channels connected to the main channel controller. Cascading is accomplished by connect- ing the main channel of one unit to a subchannel of another unit. See...
  • Page 13 Telenetics 2185 Figure 1-4. Local Cascading Application...
  • Page 14 Telenetics 2185 Two or more of the 2185s can be located at one site as shown in Figure 1-4. Alternatively, the units may be located at sites remote from each other, and connect via modems. See Figure 1-5. Figure 1-5. Remote Cascading Application...

  • Page 15: Specifications

    SPECIFICATIONS Table 1-1 summarizes 2185 specifications. Table 1-1. 2185 Specifications Data Rates Internally Generated Externally Clocked Data Format Synchronous Retiming Buffer Elastic storage buffer with ± 4-bit capacity Subchannel to Main Channel Contention Data Interface Characteristics Anti-Streaming Timers Disable Timer...
  • Page 16 Telenetics 2185 1-10...

  • Page 17: Chapter 2, Installation

    Table 1-2 - 2185 Specifications. Install the 2185 within 5 feet (1.5 meters) of a grounded ac outlet capa- ble of furnishing the required primary power (115 V ac or 230 V ac).The unit must also be located within 50 feet (15.2 meters) of the terminal...

  • Page 18: Unpacking

    UNPACKING Packing Materials Your 2185 is wrapped in re-usable, shock-absorbent packing material. Telenetics recommends that you keep this packing material and the shipping carton in case the unit must be stored, shipped, or returned to Telenetics for service. Check the contents of the package against the packing list for material shortages and inspect the unit, for physical damage, which may have occurred in shipment.If there is any damage to the equipment, contact...

  • Page 19: Installation Procedure

    INSTALLATION PROCEDURE Equipment Assembly The 2185 is shipped as a completely assembled unit with the printed cir- cuit board and power supply sub-assemblies already installed.No further assembly is required. Installation Tools Required The only tool required is a small slot screwdriver to tighten the screws securing the interface cable connectors to the connectors on the unit's rear panel.
  • Page 20 PORT 5 PORT 2 Figure 2-1. Rear Panel Assembly Note: The 2185 may have its main channel or any subchannel config- ured as DCE or DTE.Any necessary signal crossovers are performed internally. PORT 4 PORT 3 PORT 1 PORT 0...
  • Page 21 Note: The 2185 may have its main channel or any subchannel configured as DCE or DTE. Any necessary signal crossovers are performed internally. Figure 2-2. Straight-Through Cable Interface Figure 2-2 shows the straight-through cable signal interface. Be sure to tighten all connectors securely to ensure good mechanical connection, and to assure the integrity of the cable shield.
  • Page 22 Telenetics 2185...

  • Page 23: Chapter 3, Operation And Configuration

    INDICATORS The 14 LED indicator lamps used to monitor operating status on the 2185 are visible from the front of the unit through windows in the swing-down front door (see Figure 3-1). All operating controls and switches on the 2185 are readily accessible when you open the front door (see Figure 3-2).
  • Page 24 Telenetics 2185 Figure 3-2. 2185 Inside Front Panel...

  • Page 25: Function Switches

    (i. e., appropriate switch set to the up position). Table 3-1. Enabling/Disabling Subchannels Switch Disable Subchannel 1 Disable Subchannel 2 Disable Subchannel 3 Disable Subchannel 4 Disable Subchannel 5 Telenetics 2185 Down Enable Subchannel 1 Enable Subchannel 2 Enable Subchannel 3 Enable Subchannel 4 Enable Subchannel 5...

  • Page 26: Function Switch Two

    Switch segments 1-6 to 1-8 are used to set the data rate on the 2185. See Table 3-2 for information on setting these switches. Table 3-2. Data Rate Selection Using Switch Segments 1-6 to 1-8 Clock Data Rate (bps) Set 1-6 to:...
  • Page 27 • Switch 2-3 set to up position – Normal • Switch 2-3 set to down position – Buffer bypassed When the 2185 is configured for asynchronous data format (function switch 2-2 is set to the down position), that switch may be ignored.
  • Page 28 When the 2185 is configured for subchannel 1 DCE clock timing (Fig- ures 3-7 and 3-8), the 2185 uses the Receive Clock signal of the DCE for timing. Should DCE's clock signal fail, the Clock Alarm on the 2185 illuminates and the 2185 reverts to its own internal oscillator.
  • Page 29 This switch is ignored when the main channel is connected to a DTE device. If the 2185 is set for CTS strapped ON, CTS is sent to a contending sub- channel DTE device as soon as the main channel is available.
  • Page 30 Telenetics 2185 Figure 3-3. External Clock Reference with Main Channel DTE...
  • Page 31 Telenetics 2185 Figure 3-4. External Clock Reference with Main Channel DCE...
  • Page 32 Telenetics 2185 Figure 3-5. Internal Clock Reference with Main Channel DTE 3-10...
  • Page 33 Telenetics 2185 Figure 3-6. Internal Clock Reference with Main Channel DCE 3-11...
  • Page 34 Telenetics 2185 Figure 3-7. Subchannel 1 DCE Clock Reference with Main Channel DTE 3-12...
  • Page 35 Telenetics 2185 Figure 3-8. Subchannel 1 DCE Clock Reference with Main Channel DCE 3-13...

  • Page 36: Function Switch Three

    Set to Up (DTE) if the channel is connected to a DTE-type device such as a CPU port or a terminal (this configures the 2185 interface as Data Circuit-terminating Equipment - DCE). Set down (DCE) if the channel is connected to a DCE-type device such as a modem (this configures the 2185 interface as Data Terminal Equip- ment - DTE).

  • Page 37: Digital Bridging Application Example

    Digital Bridging Application Example One of the most common applications for your 2185 is as a digital bridge. In this instance, a 2185 is used to connect a large number of local and remote asynchronous terminals to a mainframe computer at a central site.
  • Page 38 Telenetics 2185 Figure 3-9. 2185 Digital Bridging Application 3-16...
  • Page 39 Down Down Table 3-7. Switch Two Switch Segment Setting Down Down Down Telenetics 2185 Reason Enable Subchannel 1 Enable Subchannel 2 Enable Subchannel 3 Disable Subchannel 4 Disable Subchannel 5 The settings of these three switches set the data rate (9.

  • Page 40: Leased-Line Backup Application Example

    Leased-Line Backup Application Example Another common application example for your 2185 is the Leased-Line Backup application. In this example, the 2185 is again used to connect a mainframe to remote users. The primary connection is through a digital network via DSUs (Digital Service Units). The backup route is through leased-lines via dial modems.
  • Page 41 Telenetics 2185 Figure 3-10. 2185 Leased-Line Backup Application 3-19...
  • Page 42 Subchannels one and two of both 2185 A and 2185 B are set to DCE as that is the type of device to which they are connected. The main channel of 2185 B is set to DTE since it is con- nected to the controller.
  • Page 43 Down Down Down Table 3-11. Switch Three Switch Segment Setting Down Down Telenetics 2185 Reason Data Contention Synchronous operation Retiming Buffer on Depends on line conditions Clock source from Subchannel One DSU RTS/DCD on all the time Doesn't matter (Main Ch DTE)

  • Page 44: Multimaster Multidrop Application Example

    Telenetics 2185 Multimaster Multidrop Application Example In this application, 2185s are used to provide a link between remote users and two mainframes, with the second mainframe serving as the backup for the first. Figure 3-11 shows this application. SCH. 4 Figure 3-11.
  • Page 45 2185 A main channel set to DTE and the 2185 B main channel set to DCE. The data rate is 1.2 kpbs asynchronous so clocking is not an issue. Subchannel one of 2185 A is connected directly to the local host computer and is set to DTE.
  • Page 46 Table 3-13. Switch Two Settings – 2185 A Switch Segment Setting Down Down Table 3-14. Switch Three Settings – 2185 A Switch Segment Setting Down Table 3-15. Switch One Settings – 2185 B Switch Segment Setting Down Down Down Down...
  • Page 47 Table 3-16. Switch Two Settings – 2185 B Switch Segment Setting Down Down Down Table 3-17. Switch Three Settings – 2185 B Switch Setting Down Down Down Telenetics 2185 Reason Data Contention Asynchronous operation Does not matter, since the unit is on for...

  • Page 48: Main Power Connection

    230 V ac line voltage.) Others - If the above power arrangements are not applicable to your country, the 2185 requires a fused power supply: 24 V ac ± 10%, 50 to 60 Hz, center-tapped, at 0. 2A (order Cable Product Code 28415?).
  • Page 49 Telenetics 2185 Alternative power supplies that were not approved at the time of this publication may be available; consult your local distributor for special requirements. Figure 3-12. 2185 - Power Connection 3-27...

  • Page 50: Operation

    Telenetics 2185 OPERATION Once you successfully power-up your 2185, it is fully operational and does not require any further initialization procedures. Once configured, your 2185 operates unattended without operator inter- vention. Occasional monitoring of the LED status indicators is recommended.

  • Page 51: Chapter 4, Operation And Configuration

    Use a soft cloth to remove dust that may have built up on the outside of the unit. Corrective Maintenance There are no user-repairable components in the 2185. The 2185 is designed to provide maximum up-time. In the event that repairs are required, Telenetics Corporation or an authorized Telenetics representa- tive should perform them.

  • Page 52: Returning Defective Equipment For Repair

    REPAIR General Packing Information When returning defective equipment to Telenetics or an authorized Telenetics representative for repair, pack the equipment using the fol- lowing guidelines. 1. Do not mark the equipment. Enclose a shipping list identifying each item by serial/part number. Defective units should have tags attached...

  • Page 53: Installations Outside The Usa Or Canada

    Installations Outside the USA or Canada Customers outside the USA and Canada should return defective units to Telenetics Corporation at the above address. Before shipping the unit, obtain a Return Authorization Number and the Return Procedure from Telenetics Corporation. The Return Procedure outlines the appropriate Canadian Customs documentation and information that must accom- pany each return shipment.
  • Page 54 Telenetics 2185...

  • Page 55: Chapter 5, Ordering Information

    This chapter provides Telenetics product and ordering information for the 2185. Ordering Information Table 5-1 lists Telenetics 2185 products for and accessories. Any of the items listed may be ordered from your authorized Telenetics representa- tive. Table 5-1. Telenetics Ordering Information...
  • Page 56 Telenetics 2185...

  • Page 57: Glossary

    This glossary defines terms used in the 2185 Operator's Guide. ACTIVE ALARM Anti-Streaming Anti-Streaming Time-out Cascading Co-Located Terminals Using the 2185, any combination of subchannel Contention LED indicator lamp that illuminates when the subchannel indicated gains access to the main channel.
  • Page 58 16 consecutive mark bits are detected. In the modem-sharing mode, the CPU or controller is at a site remote from the 2185. The 2185's main channel connects to the CPU through a modem link (DCE). Subchannel terminals are connected directly to the 2185 DSD.
  • Page 59 Synchronous When operating in a synchronous data environment, Retiming Buffer the 2185 uses an internal ±4-bit buffer to retime inbound subchannel data to the main channel clock. The buffer compensates for phase differences between the subchannel and main channel clocks and can absorb clock jitter and minor differences in frequency.When the 2185 is configured for...
  • Page 60 Telenetics 2185 Glossary-4...
  • Page 61 Anti-streaming 1-3 Anti-streaming alarm, recovery 4-1 Applications 1-3 cascading the 2185 1-6, 1-8 co-located terminals 1-6 modem-sharing mode 1-5 port-sharing mode 1-4 Cabling 2-3 Cascading the 2185 1-6, 1-8 Co-located terminals 1-6 configuration defined 3-1 Configuration examples 3-14 digital bridging 3-15...
  • Page 62 Index (continued) Indicators 3-1 Inside front panel 3-2 Installation procedure 2-3 cabling 2-3 equipment assembly 2-3 mechanical 2-3 required tools 2-3 Installation tools 2-3 Installations outside USA or Canada 4-3 USA 4-2 Leased-line backup application 3-18 LED indicators 3-14 Main channel broadcast 1-2 Main power connection 3-26 Maintenance corrective 4-1...

  • Page 63: Index (Continued)

    Site preparation 2-1 Specifications 1-9 Subchannel contention 1-2 Switches 3-3 switch one 3-3 switch three 3-14 switch two 3-4 Synchronous data retiming buffer 1-2 Unpacking 2-2 Index (continued) INDEX-3...
  • Page 64 Index (continued) INDEX-4...

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