Digital Bridging Application Example | Telenetics 2185 specification

Telenetics 2185

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. Figure 3-9 shows this application.

In this application, the main channel of the 2185 connects to a host com- puter through a front-end processor. The data rate is 9. 6 kbps and the format is synchronous. Since the main channel is connected to a DTE- type device, the main channel on the 2185 is set to DTE.

All three subchannels are set to operate at 9. 6 kbps, as they must be the same as the main channel. Subchannels one and two are set to DTE, since they are connected directly to controllers. Subchannel three is set to DCE, as it connects to a modem. The following charts show the cor- rect switch settings for this particular application.

3-15

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Telenetics 2185 manual Digital Bridging Application Example

Contents

Telenetics Proprietary Material Page Page Contents Ordering Information Introduction FeaturesData Interface Main Channel Broadcast Subchannel ContentionSynchronous Data Retiming Buffer Anti-Streaming Applications Port-Sharing Application Port-Sharing Mode Modem-Sharing Application Modem-Sharing Mode Cascading Co-Located Terminals Local Cascading Application Remote Cascading Application Specifications Specifications Telenetics Site Selection and Preparation Customer Responsibilities Packing Materials UnpackingEquipment Supplied Damage/Material Shortages Equipment Assembly Installation ProcedureInstallation Tools Required Mechanical Installation Rear Panel Assembly Straight-Through Cable Interface Telenetics Front View Door Closed Operating Controls Indicators Inside Front Panel Function Switch One Function SwitchesEnabling/Disabling Subchannels Data Rate Selection Using Switch Segments 1-6 to Function Switch TwoFunction Switch Two Summary Switch Segment 2-1 Contention Mode Clock Routing Configurations Switch Segment 2-4 Anti-Streaming Enable/Disable Switch Segment 2-7 Main Channel RTS/DCD Strapping External Clock Reference with Main Channel DTE External Clock Reference with Main Channel DCE Internal Clock Reference with Main Channel DTE Internal Clock Reference with Main Channel DCE Subchannel 1 DCE Clock Reference with Main Channel DTE Subchannel 1 DCE Clock Reference with Main Channel DCE Configuration Examples LED IndicatorsFunction Switch Three DTE/DCE Optioning Digital Bridging Application Example Digital Bridging Application Switch Two Switch One Switch Three Leased-Line Backup Application Example 10 Leased-Line Backup Application Switch One 11. Switch Three 10. Switch Two 11. Multimaster Multidrop Application Multimaster Multidrop Application Example 12. Switch One Settings 2185 a 14. Switch Three Settings 2185 a 13. Switch Two Settings 2185 a15. Switch One Settings 2185 B 17. Switch Three Settings 2185 B 16. Switch Two Settings 2185 B 18. LED Status Indicator Functions Main Power Connection 12 Power Connection Operation POWER-DOWN Procedure Preventive Maintenance Maintenance PhilosophyCorrective Maintenance Recovery from Anti-Streaming Alarm Condition Returning Defective Equipment for Repair Installations in the USAGeneral Packing Information Installations Outside the USA or Canada Telenetics Telenetics Ordering Information Ordering Information Telenetics Glossary Glossary-2 Glossary-3 Glossary-4 Index INDEX-2 INDEX-3 INDEX-4