Telenetics 2185 User's Manual
Contents
1. Item Product Code Description Standalone Units 2185 28500 115V ac 50 60 Hz 2185 28501 230V ac 50 60 Hz 2185 28502 14V ac no transformer 2185 Components 28504 5 channel nest card 28506 2185 Enclosure 28410 115 V ac power supply 28413 230 V ac power supply Documentation Operator s Guide 28510 User s Installation Operation manual 5 1 Telenetics 2185 5 2 Glossary This glossary defines terms used in the 2185 Operator s Guide ACTIVE ALARM Anti Streaming Anti Streaming Time out Cascading Co Located Terminals Contention LED indicator lamp that illuminates when the subchannel indicated gains access to the main channel LED indicator lamp that illuminates when the anti streaming timer automatically disables a subchannel Scheme that protects the network from becoming jammed should one of the subchannel devices fail If the selected subchannel remains active for longer than the anti streaming time out period it s automatically disabled and its alarm LED indicator lights up Nominally 25 seconds in the 2185 The 2185 may be cascaded to increase the number of channels that can be connected to the main channel controller Cascading is accomplished by connecting the main channel of one unit to a subchannel of another unit The cascaded units may be located at one site or the units may be located at sites remote from each other and be connected through modems2. 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 Figure 1 4 1 6 Telenetics 2185 2185 SUBCHANNELS J DTEs DCEs DTEs DCEs DCE MODEM Figure 1 4 Local Cascading Application 1 7 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 2185 SUBCHANNELS CLEC TO DTEs OR DCEs TO DTE OR DCE lt CHAN aed DCE MODEM 2185 SUBCHANNELS EI EI EI ES ES TO DTEs OR DCEs Figure 1 5 Remote Cascading Application 1 8 Telenetics 2185 SPECIFICATIONS Table 1 1 summarizes 2185 specifications Table 1 1 2185 Specifications Data Rates Internally Generated 75 1200 2400 4800 7200 9600 14400 1920 0 bps all 0 01 Externally Clocked Any rate up to 20000 bps Data Format Asynchronous or Synchronous Synchronous Retiming Buffer Elastic storage buffer with 4 bit capacity Subchannel to Main Channel Contention Control Signal RTS or DCD or Data Contention Data Interface Characteristics Compatible wit
3. Three Function switch three is a six segment DIP switch used to configure the data interfaces for each channel 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 Table 3 5 DTE DCE Optioning Position Sw3 1 Sw3 2 Sw3 3 Sw3 4 Sw3 5 Sw3 6 Up MainCh Sch 1 Sch 2 Sch 3 Sch 4 Sch 5 DTE DTE DTE DTE DTE DTE Down MainCh Sch 1 Sch 2 Sch 3 Sch 4 Sch 5 DCE DCE DCE DCE DCE DCE LED INDICATORS Table 3 6 lists the functions of the LED status indicators Under normal operating conditions none of the alarm indicators is illuminated Refer to the section entitled Recovery From Anti Streaming Alarm Condition in Chapter 4 Maintenance for the procedure to handle alarms CONFIGURATION EXAMPLES The following examples show how you might option your 2185 for a variety of configurations These examples are provided to demonstrate the versatility of the 2185 Your specific application and thus product configuration may differ from those described here For an explanation of the various switches refer to the function switch descriptions in the previous sections Telenetics 2185 Digital Bridging Application Ex
4. main channel is connected to a DTE type device the main channel 2185 A is set to DTE Two subchannels are connected to 2 85 B through two networks One rout is through a digital network and the backup route is through a com mon telephone network Subchannels one and two of both 2 85 A and 2165 B are set to DCE as that is the type of device to which they are connected The main channel of 2785 B is set to DTE since it is con nected to the controller Clocking in this network is derived from the DSU connected to Subchannel One The following tables show the correct switch settings for this particular application and apply to both 2185s Table 3 9 Switch One Switch Segment Setting Reason 1 1 Down Enable Subchannel 1 1 2 Down Enable Subchannel 2 1 3 Up Disable Subchannel 3 1 4 Up Disable Subchannel 4 1 5 Up Disable Subchannel 5 1 6 Down The settings of these three 13 U switches set the data rate P 9 6 kpbs 1 8 Down 3 20 Telenetics 2185 Table 3 10 Switch Two Switch Segment Setting Reason 2 1 Down Data Contention 2 2 Up Synchronous operation 2 3 Up Retiming Buffer on 2 4 XX Depends on line conditions 2 5 Down Clock source from 2 6 Up Subchannel One DSU 2 7 Down RTS DCD on all the time 2 8 XX Doesn t matter Main Ch DTE Table 3 11 Switch Three Switch Segment Setting Reason 3 1 Up Main Channel connect
5. to set the subchannel status and the clock data rate Function Switch two is used to set the operating parameters of the 2185 Function Switch three is used to configure the data interfaces for each channel 2185 DIGITAL BRIDGE oo aa O01 OD2 OD3 OD4 dos CLKIPWR DATA RDY SUB CHANNELS ACTIVE ALARM FUNCTION SWITCH 1 FUNCTION SWITCH 2 FUNCTION SWITCH 3 Figure 3 2 2185 Inside Front Panel 3 2 Telenetics 2185 FUNCTION SWITCHES The front panel mounted controls consist of three Dual In line Package DIP function switches Switch banks one and two contain eight indi vidual switches and switch three contains six individual switches The role of function switches one two and three is summarized in Tables 3 1 through 3 5 The following paragraphs describe these func tions in more detail Function Switch One Function switch one is an eight segment DIP switch used to enable or disable each of the five subchannels It is also used to set the clock data rate Switch segments 1 1 through 1 5 Disable Enable subchannels one through five respectively Their operation is described as follows Switch 1 n is set to up position to disable Subchannel n Switch 1 n is set to the down position to enable Subchannel n wherenz 1 5 Subchannels may be disabled to prevent them from contending for the main channel The main channel broadcasts to all subchannels whether the s
6. 2185 selects one subchannel and blocks data from all the others You may select either of two contention modes either data contention or control signal contention When operating in a synchronous data environment 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 asynchronous operation the retiming buffer is bypassed Glossary 3 Telenetics 2185 Glossary 4 Index A 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 leased line backup 3 18 multimaster multidrop 3 22 Corrective maintenance 4 1 Customer responsibilities 2 1 D Damage 2 2 Data interface 1 1 Digital bridging application 3 15 E Equipment assembly 2 3 Equipment supplied 2 2 F Features 1 1 anti streaming 1 3 Data interface 1 1 Main channel broadcast 1 2 subchannel contention 1 2 synchronous data retiming buffer 1 2 Front panel 3 2 Front view 3 1 Function switches 3 3 switch one 3 3 switch three 3 14 switch two 3 4 G General packi
7. A Control Number should be clearly marked on the return equipment shipping container s for easy identification and faster service The RMA Control Number is a shipment control tool and does not affect the provisions of a Sales or Lease agreement You need to supply the following information for each piece of equipment returned Product Name and Description Product Serial Number Customer Order Number Failure Symptoms When possible include a purchase order number for billing purposes After packaging the defective materials ship them prepaid to Telenetics Corporation 25111 Arctic Ocean Lake Forest California 92630 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 4 3 Telenetics 2185 4 4 Chapter 5 Ordering Information INTRODUCTION 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
8. ENT TIMING RX CLK 17 gt lt 20 CD 108 DTE READY DTR 20 TRANSMITTER SIGNAL 24 DA 113 ELEMENT TIMING 24 DTE EXT CLK 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 Telenetics 2185 2 6 Chapter 3 Operation and Configuration INTRODUCTION This chapter describes the 2185 operating controls and indicators how to configure and operate your 2185 using these operating controls and how to power up and power down the unit Once configured your 2185 operates unattended without operator intervention Occasional monitoring of the LED status indicators is recommended OPERATING CONTROLS AND 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 te Figure 3 1 Front View Door Closed 3 1 Telenetics 2185 This bank of LEDs is used to monitor the operating status of the 2185 Function Switch one is used
9. Telenetics 2185 Digital Bridge User Guide Notice 2001 Telenetics Corporation 25111 Arctic Ocean Lake Forest California 92630 949 455 4000 All rights reserved Printed in U S A 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 This document is for information purposes only and is subject to change without notice 4 Warning This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause interference to radio communica tions It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules which are designed to provide reasonable protection against such interference 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 or her own expense is required to take whatever measures may be required to correct the interference Notice cont d 4 Warning This equipment does not exceed the Class A limits for radio noise i
10. Using the 2185 any combination of subchannel DTE devices and subchannel DCE devices is possible For example local subchannel terminals can be co located with modems that communicate with devices at remote sites Co location of ports and modems can be performed in both port sharing and modem sharing operation modes In communications the case where multiple users vie for the right to use a transmission channel on a first come first serve basis whether a PBX circuit a computer port or a time slot within a multiplexed facility Glossary 1 Telenetics 2185 Controller Control Signal Contention Mode DATA Data Contention Modem Sharing Multipoint Port Port Sharing Glossary 2 Device responsible for polling terminals and routing messages in a multipoint environment Subchannels contend for use of the main channel to send data to the CPU or controller In the control signal contention mode subchannel devices contend by raising control signal RTS if the device is a DTE or control signal DCD if the device is a DCE The 2185 DSD returns CTS to a selected subchannel device The selected subchannel disconnects from the main channel when the subchannel device drops RTS or DCD LED indicator lamp that illuminates when the main channel inbound data is aSPACE Subchannels contend for use of the main channel to send data to the CPU or controller In the data contention mode a subchannel contends for access to the
11. ac or 230 V ac The unit must also be located within 50 feet 15 2 meters of the terminal ports and or modems to be connected to it At least 5 inches 12 7 cm clearance at the rear of the unit is needed for interface cabling 2 1 Telenetics 2185 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 the shipping agent immediately Equipment Supplied The contents of the shipping carton are as follows One Telenetics 2185 One transformer One Telenetics 2185 Operator s Guide Damage Material Shortages Direct any additional questions about damage or missing parts to your nearest Telenetics representative or contact Telenetics Corporation 25111 Arctic Ocean Lake Forest California 92630 949 455 4000 Web site htttp www telenetics com 2 2 Telenetics 2185 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 Requ
12. ample 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 Telenetics 2185 Front End Processor Subchannel 1 Main Channel COMPUTER Figure 3 9 2185 Digital Bridging Application 3 16 Telenetics 2185 Table 3 6 Switch One Switch Segment Setting Reason 1 1 Down Enable Subchannel 1 1 2 Down Enable Subchannel 2 1 3 Down Enable Subchannel 3 1 4 Up Disable Subchannel 4 1 5 Up Disable Subchannel 5 1 6 Down The settings of these three 17 U switches set the data rate 9 6 kpbs 1 8 Down Table 3 7 Switch Two Switch Segm
13. ata during network failure conditions Either of two modes of contention may be selected data contention or control signal contention In the data contention mode subchannel devices contend for access to the main channel by sending data beginning with a space bit The selected subchannel is disconnected from the main channel after 16 con secutive mark bits are detected In the control signal contention mode subchannel devices contend by raising control signal RTS if the device is a DTE or control signal DCD if the device is a DCE The 2185 returns CTS to a selected subchannel DTE device The selected subchannel disconnects from the main chan nel when the subchannel device drops RTS or DCD Synchronous Data Retiming Buffer In synchronous operation the 2185 uses an internal buffer to retime inbound subchannel data to the main channel clock To allow for unin terrupted service this buffer compensates for phase differences between the subchannel and main channel clocks and can absorb clock jitter and minor differences in frequency Without the buffer the differences in 1 2 Telenetics 2185 phase frequency and the presence of jitter could cause the subchannel and the main channel to lose synchronization If synchronization is lost data errors occur and transmission fails When the 2185 is configured for asynchronous operation the retiming buffer is bypassed Anti Streaming Anti streaming protects the network from becom
14. chronous data format switches 2 5 and 2 6 are ignored If the 2185 is configured for synchronous data format switches 2 5 and 2 6 are used to select the master clock source The network may be clocked from the main channel device the 2185 s internal clock or the Subchannel 1 device if it is a DCE device Switch segments 2 5 and 2 6 much be set as described in Table 3 4 Note that only the configurations listed in Table 3 2 are valid all other combinations are illegal and result in errors 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 Table 3 4 Clock Routing Configurations Clock Fig Ref Source Subchannel 1 Set 2 5 to Set 2 6 to 3 3 4 Main Channel X Up Down 3 5 6 Internal X Down Down 3 7 8 Sub Ch 1 DCE Down Up Note does not matter 3 6 Telenetics 2185 Switch Segment 2 7 Main Channel RTS DCD Strapping Switch 2 7 set to up position RTS DCD transparent Switch 2 7 set to down position RTS DCD strapped ON When switch segment 2 7 is set for transparent RTS DCD operation the main channel outbound RTS or DCD signal is ON only when a subchan nel is active When switch segment 2 7 is set to the down position the main channel RTS DCD is strapped ON at a
15. ee 1 2 3 14 3 14 Configuration Examples seen 3 14 Digital Bridging Application Example 3 15 Leased Line Backup Application Example 3 18 Multimaster Multidrop Application Example 3 22 Main Power Connection essent 3 26 Operation oom RR de siet ss IU ndo 3 28 Power Down Procedure 22 00002001120 3 28 Telenetics 2185 Chapter 4 Operation and Configuration Maintenance Philosophy Preventive Maintenance Corrective Maintenance esee Recovery from Anti Streaming Alarm Condition Returning Defective Equipment for Repair General Packing Information Installations in the USA Installations Outside the USA or Canada 4 1 s Al s Al we Al 4 2 4 2 4 2 4 3 Chapter 5 Ordering Information Introduction Ordering Information Glossary Index vi 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 The 2185 is a versatile unit that can be used in both port sharing and modem sharing applications The main channel and each
16. ent Setting Reason 2 1 Up Control Signal Contention 2 2 Up Synchronous operation 2 3 Up Retiming Buffer on 2 4 XX Depends on line conditions typically set to down 2 5 Down Internal clock source 2 6 Down 2 7 Down RTS DCD on all the time 2 8 XX Doesn t care Main Ch DTE 3 17 Telenetics 2185 Table 3 8 Switch Three Switch Segment Setting Reason 3 1 Up Main Channel connection to DTE 3 2 Up Subchannel one connection to DTE 3 3 Up Subchannel two connection to DTE 3 4 Down Subchannel three connection to DCE 3 5 XX Subchannel four not used 3 6 XX Subchannel five not used 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 Figure 3 10 shows this application 3 18 Telenetics 2185 Front End computer Processor Main Channel Subchannel 1 m psi 2 4 Subchannel 2 Main Channel Figure 3 10 2185 Leased Line Backup Application 3 19 Telenetics 2185 In this application the main channel of 2 85 A is connected to a host computer through a front end processor The data rate is 9 6 kbps and the format is synchronous Since the
17. h EIA 232 D and CCITT V24 Anti Streaming Timers Disable Timer 25 seconds 2 3 1 1 seconds Re Enable Timer 1 5 seconds 0 20 0 01 seconds Physical Characteristics Height 2 75 in 6 69 cm Width 8 54 in 21 69 cm Depth 16 00 in 40 64 cm Weight 5 00 Ib 2 3 kg Environmental Characteristics Operating Temperature 32 F to 122 F 0 C to 50 C Humidity 95 maximum non condensing Altitude Sea Level to 8000 ft 2440m AC Power Requirements 90 V ac to 132 V ac 180 V ac to 264 V ac 47 to 63 Hz 10 Watts max power consumption 1 9 Telenetics 2185 Chapter 2 Installation INTRODUCTION This chapter contains the information you need to install you Telenetics 2185 CUSTOMER RESPONSIBILITIES After delivery of your equipment and before installation you are responsible for moving it to the installation site unpacking and check ing it for material shortages and or damage which may have occurred during shipment SITE SELECTION AND PREPARATION Ensure that the area where your Telenetics 2185 is to be installed is clean and free from extremes of temperature humidity shock and vibration The site must meet the physical environmental and power requirements listed in 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
18. hannel 3 1 4 Down Enable Subchannel 4 1 5 Down Enable Subchannel 5 1 6 Up The settings of these three 13 U switches set the data rate E P 1 2 kpbs 1 8 Down 3 24 Telenetics 2185 Table 3 16 Switch Two Settings 2185 B Switch Segment Setting Reason 2 1 Down Data Contention 2 2 Down Asynchronous operation 2 3 XX Does not matter since the unit is on for sync only 2 4 XX Depends on line conditions 2 5 XX Doesn t matter since the unit is set for 2 6 XX async operation 2 7 Down RTS DCD on all the time 2 8 Up CTS on all the time Table 3 17 Switch Three Settings 2185 B Switch Setting Reason 3 1 Down Main Channel connection to DCE 3 2 Up Subchannel one connection to DTE 3 3 Up Subchannel two connection to DTE 3 4 Down Subchannel three connection to DCE 3 5 Up Subchannel four connection to DTE 3 6 Down Subchannel five connection to DCE 3 25 Telenetics 2185 Table 3 18 LED Status Indicator Functions LED Indicator Function SYSTEM Illuminates when the unit powers up POWER CLOCK FAIL Illuminates when the 2185 derives its clock signal from ALARM Subchannel 1 DCE and the clock input fails MAIN CHANNEL DATA Illuminates when the main channel inbound data is a SPACE RDY Ready Illuminates when the main channel inbound DSR or DTR is ON SUBCHANNELS 1 TO 5 ACTIVE Illuminates w
19. hen the subchannel indicated gains access to the main channel ALARM Alarm illuminates for a channel that Is automatically dis abled by the anti streaming timer Under normal operating conditions all of these LED indicator lamps should be extinguished MAIN POWER CONNECTION 115 Volt Models 115V ac models use a wall mount transformer Prod uct Code 28410 equipped with a North American plug An appropriate adapter may be used in other countries supplying 115V ac line voltage This supply allows operation on 100 V ac systems 230 Volt Models 230 V ac models use a desktop transformer Product Code 28413 equipped with a CEE7 7 plug An appropriate adapter may be used in other countries supplying 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 3 26 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 Wall Mount i Transformer 115VAC OR Desktop Transformer d 230VAC Figure 3 12 2185 Power Connection 3 27 Telenetics 2185 OPERATION Once you successfully power up your 2185 it is fully operational and does not require any further initialization procedures Once configured yo
20. ing jammed if one of the subchannel devices fails If the subchannel remains active for longer than the anti streaming time out period nominally 25 seconds it auto matically is disabled and its alarm LED indicator lamp illuminates When a subchannel is disabled it disconnects from the main channel and is not permitted to contend for the main channel again until after it is re enabled Before attempting to re enable the subchannel device it must be inactive for approximately 1 5 seconds The alarm LED then extinguishes and the subchannel can again contend for the main chan nel 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 When considering possible applications for your 2185 remember the following points The 2185 can transmit in either asynchronous or synchronous for mat but all devices in the network must use the same format All devices must operate at the same data rate When the main channel is connected to a DCE device the transmit and receive clocks may be at different rates but all devices have common transmit clocks and common receive clocks 1 3 Telenetics 2185 When operating with control signal contention
21. ion to DTE 3 2 Down Subchannel one connection to DCE 3 3 Down Subchannel two connection to DCE 3 4 XX Subchannel three not used 3 5 XX Subchannel four not used 3 6 XX Subchannel five not used 3 21 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 SUBCHANNEL 1 SUBCHANNEL 2 1111 2185 TL 2185 SCH 5 MODEM SCH 1 SCH 2 SCH 4 SCH 3 I ey Es MODEMS Figure 3 11 Multimaster Multidrop Application Telenetics 2185 In this application the main channel of both 2 85 A and 2165 B are con nected via a straight through cable with the 2785 A main channel set to DTE and the 2785 B main channel set to DCE The data rate is 1 2 kpbs asynchronous so clocking is not an issue Subchannel one of 2 65 A is connected directly to the local host computer and is set to DTE Sub channel two is connected via a modem link to the backup computer installation and is set to DCE five subchannels of 2185 are connected to external devices with s
22. ired 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 Mechanical Installation The 2185 is a tabletop unit No provisions are made for securing the unit to any surface Cabling external connections to the 2185 are made via EIA 232 D 25 pin connectors located on the rear panel see Figure 2 1 and their associ ated straight through cables There are six connectors one for the main channel and one for each subchannel In Figure 2 1 Port 0 2 Main Channel Port 1 2 Subchannel 1 Port 2 Subchannel 2 Port 3 Subchannel 3 Port 0 2 Subchannel 4 Port 1 2 Subchannel 5 2 3 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 Telenetics 2185 DATA CIRCUIT DATA TERMINATING PIN AIE CCITT SIGNAL PIN TERMINAL EQUIPMENT No 232 V 24 NAME No EQUIPMENT 1 101 SHIELD 1 2 BA 103 TRANSMITTED DATA 2 lt lt DCE 3 BB 104 RECEIVED DATA 3 gt DTE 4 CA 105 REQUEST TO SEND RTS 4 lt 5 CB 106 CLEAR TO SEND CTS 5 gt 6 107 DCE READY DSR 6 gt 7 AB 102 SIGNAL GROUND 7 RECEIVED LINE SIGNAL 8 CF 109 DETECTOR DCD 8 gt TRANS R SIGNAL ELEMENT 15 DB 114 Timne DCE TX CLK 15 gt RECEIVER SIGNAL 17 DD 115 ELEM
23. ll times Switch Segment 2 8 Main Channel CTS Strapping Switch 2 8 set to up position CTS strapped ON Switch 2 8 set to down position CTS transparent 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 When switch segment 2 8 is set for transparent CTS the CTS signal is not set to a contending subchannel DTE device until CTS has been received ON from the main channel device See Figures 3 3 through 3 8 3 7 Telenetics 2185 SUBCHANNEL B Figure 3 3 External Clock Reference with Main Channel DTE 3 8 Telenetics 2185 SUBCHANNEL A SUBCHANNEL B Figure 3 4 External Clock Reference with Main Channel DCE Telenetics 2185 DTE MAIN CHANNEL DCE s Figure 3 5 Internal Clock Reference with Main Channel DTE 3 10 Telenetics 2185 2185 SUBCHANNEL A TO BUFFER SUBCHANNEL B Figure 3 6 Internal Clock Reference with Main Channel DCE Telenetics 2185 2185 SUB CHAN 1 SUB CHAN A SUB CHAN B TO BUFFER Figure 3 7 Subchannel 1 DCE Clock Reference with Main Channel DTE 3 12 Telenetics 2185 CLOCK SOURCE Figure 3 8 Subchannel 1 DCE Clock Reference with Main Channel DCE 3 13 Telenetics 2185 Function Switch
24. main channel by sending data beginning with a space bit The selected subchannel disconnects from the main channel after 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 A communications arrangement where multiple devices share a common transmission channel though only one device may transmit at a time Such networks usually require some kind of polling mechanism which is under the control of a master station to ensure that only one device transmits data atatime Also known as a multidrop network Physical point of access into a computer a network or other electronic device 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 DSD via modem links Telenetics 2185 RDY Straight Through Cable Subchannel Contention Synchronous Retiming Buffer Ready LED indicator lamp that illuminates when the main channel inbound DSR or DTR is ON Cable terminated with 25 pin EIA connector at each end Connections are made on a pin to pin basis See Figure 2 2 Subchannels contend for use of the main channel to send data to the CPU or controller If more than one subchannel tries to access the main channel at one time the
25. ng information 4 2 Glossary 1 INDEX 1 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 L Leased line backup application 3 18 LED indicators 3 14 Main channel broadcast 1 2 Main power connection 3 26 Maintenance corrective 4 1 preventive 4 1 Material shortages 2 2 Mechanical installation 2 3 Modem sharing mode 1 5 Multimaster multidrop application 3 22 O Operating controls 3 1 Operation 3 28 Ordering information 5 1 P Packing materials 2 2 Port sharing mode 1 4 Power down procedure 3 28 Preventive maintenance 4 1 R Recovery from anti streaming alarm 4 1 Returning defective equipment for repair 4 2 S Site selection 2 1 INDEX 2 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 U Unpacking 2 2 Index continued INDEX 3 Index continued INDEX 4
26. nterference emissions from digital apparatus as specified in the radio interference regulations of the Canadian Department of Communications Contents Chapter 1 Introduction Introduction taste tee re rte ehe a HERR ph en 1 1 2185 FEATURES E Data Interface mecum ert e M ies 1 1 Main Channel Broadcast essere 1 2 Subchannel Contention 1 2 Synchronous Data Retiming Buffer 1 2 Anti Streaming esee 1 3 APPLICATIONS 1 3 Port Sharing Mode 1 4 Modem Sharing Mode 1 5 Co Located Terminals 1 6 Cascading the 2185 2 1 6 da One 1 9 Chapter 2 Installation INTRODUCTION oi ware 2 1 CUSTOMER RESPONSIBILITIES wee 2 1 Site Selection and Preparation 21 Unpacking ne 222 2 Packing Materials 5 2259 Equipment Supplied 222 2 Damage Material Shortages 2 2 Installation Procedure s 2 3 Equipment Assembly u 2 3 Installation Tools Required 225259 Mechanical Installation s 2 3 Cable iia 2 3 Chapter 3 Operation and Configuration Introduction e res esee tee ee nete 3 1 Operating Controls and Indicators 3 1 Function Switches u 3 3 Function Switch One 2 3 3 Function Switch Two u 3 4 Function Switch Thr
27. of the five subchannels are individually configurable as either EIA 232 D Data Terminal Equipment DTE or Data Circuit terminating Equipment DCE Data received on the main channel is broadcast simultaneously to the subchannels Subchannels contend for one at a time access to the main channel 2185 FEATURES To ensure trouble free operation and allow for network growth you 2185 has a number of impressive built in features including subchannel contention anti streaming and a synchronous data retiming buffer Data Interface To virtually guarantee you are able to connect your equipment to the 2185 all data interfaces main channel and five subchannels are EIA 232 D compatible They can be individually configured as DTE or DCE via front panel mounted DIP switches All connections to the 2185 are made via straight through cables 1 1 Telenetics 2185 Main Channel Broadcast Data received on the main channel is broadcast to all subchannels In synchronous operation the corresponding clock is also broadcast DSR and DCD are sent to all subchannel DTE devices and DTR and RTS to all subchannel DCE devices Subchannel Contention 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 d
28. oning properly and anti stream ing alarms are occurring the probable cause is that the subchannel devices are sending valid messages longer than 23 seconds If this is the case disable anti streaming RETURNING DEFECTIVE EQUIPMENT FOR 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 indicating product name and description product serial number cus tomer order number the malfunction or failure indication and the return address 2 Wherever possible re use the original packing material and shipping container 3 Secure movable and exposed parts before shipment so that they don t come loose in shipment and cause or sustain damage 4 Materials that are abrasive flake off or produce dust must not be used for cushioning Installations in the USA When returning defective equipment to Telenetics for factory repair customers in the USA should contact the Telenetics Return Services Coordinator at the following number for return authorization and instructions Tel 949 455 4000 Web site http www telenetics com Telenetics 2185 When contacting Telenetics you receive a Telenetics Return Material Authorization RMA Control Number This RM
29. red as a DTE or DCE When Data Contention mode is selected switch segments 2 7 and or 2 8 must be strapped ON Switch Segment 2 2 Data Format Switch 2 2 set to up position Synchronous format Switch 2 2 set to down position Asynchronous format Set this switch to the up position for Bisynchronous or HDLC applica tions synchronous operation When set to the down position asyn chronous operation selected the retiming buffer is bypassed Switch Segment 2 3 Synchronous Data Retiming Buffer e 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 3 5 Telenetics 2185 With synchronous data transmission the data retiming buffer must be used except when all subchannels are connected to DTE devices The data retiming buffer may then be bypassed to permit passing Bisynchro nous multiple messages in Data Contention mode Switch Segment 2 4 Anti Streaming Enable Disable Switch 2 4 set to up position Anti Streaming Disabled Switch 2 4 set to down position Anti Streaming Enabled Enabling Anti Streaming limits a subchannel message to 25 seconds If subchannel messages are greater than 23 seconds in length anti stream ing should be disabled Switch Segment 2 5 and 2 6 Clock Routing When the 2185 is configured for asyn
30. the 2185 is trans parent to the data stream When operating with data contention subchannel data must be mark idle and 16 consecutive marks cannot appear in mid mes sage The minimum data rate for an external clock is 50 bps 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 DCE MODEM DCE MODEM COMPUTER DCE MODEM DCE MODEM DCE MODEM Figure 1 1 Port Sharing Application 1 4 Telenetics 2185 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 COMPUTER Figure 1 2 Modem Sharing Application 1 5 Telenetics 2185 Co Located Terminals Any combination of subchannel DTE devices and subchannel DCE devices is possible For example local subchannel terminals can be co located with modes that communicate with devices at remote sites Fig ure 1 3 shows an example of co located terminals in the port sharing mode Co location of ports and modems is also possible in the modem sharing mode DCE MODEM DCE MODEM COMPUTER Figure 1 3 Co Located
31. ubchannels are enabled or disabled Unused subchannels should be disabled 1 e appropriate switch set to the up position Table 3 1 Enabling Disabling Subchannels Switch Up Down 1 1 Disable Subchannel 1 Enable Subchannel 1 1 2 Disable Subchannel 2 Enable Subchannel 2 1 3 Disable Subchannel 3 Enable Subchannel 3 1 4 Disable Subchannel 4 Enable Subchannel 4 1 5 Disable Subchannel 5 Enable Subchannel 5 3 3 Telenetics 2185 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 Set 1 7 to Set 1 8 to 75 Up Up Up 1200 Up Up Down 2400 Up Down Up 4800 Up Down Down 7200 Down Up Up 9600 Down Up Down 14400 Down Down Up 19200 Down Down Down Function Switch Two Function switch two is an eight segment DIP switch used to set control signal contention select synchronous or asynchronous data format select or bypass the retiming buffer enable or disable anti streaming set the clock signal routing set main channel RTS on DCD transparent or on and set main channel inbound CTS transparent or on Table 3 3 Function Switch Two Summary Function Switch Switch Position Function 2 1 Up Sets Control Signal Contention Down Sets Data Contention 2 2 Up Sets s
32. ubchannels one two and four set to DTE and subchannels three and five set to DCE The following tables show the switch settings for 2 85 A first and then for 2185 B Table 3 12 Switch One Settings 2185 A Switch Segment Setting Reason 1 1 Down Enable Subchannel 1 1 2 Down Enable Subchannel 2 1 3 Up Disable Subchanel 3 1 4 Up Disable Subchannel 4 1 5 Up Disable Subchannel 5 1 6 Up The settings of these three 13 U switches set the data rate P 9 6 kpbs 1 8 Down 3 23 Telenetics 2185 Table 3 13 Switch Two Settings 2185 A Switch Segment Setting Reason 2 1 Up Control Signal Contention 2 2 Down Asynchronous operation 2 3 XX Does not matter on for sync only 2 4 XX Depends on line conditions 2 5 XX Does not matter since unit is set 2 6 XX for async operation 2 7 Down RTS DCD on all the time 2 8 XX Does not matter Main Ch DTE Table 3 14 Switch Three Settings 2185 A Switch Segment Setting Reason 3 1 Up Main Channel connection to DTE 3 2 Up Subchannel one connection to DTE 3 3 Down Subchannel two connection to DCE 3 4 XX Subchannel three not used 3 5 XX Subchannel four not used 3 6 XX Subchannel five not used Table 3 15 Switch One Settings 2185 B Switch Segment Setting Reason 1 1 Down Enable Subchannel 1 1 2 Down Enable Subchannel 2 1 3 Down Enable Subc
33. ur 2185 operates unattended without operator inter vention Occasional monitoring of the LED status indicators is recommended POWER DOWN PROCEDURE Proceed as follows to power down your 2185 Remove the ac power cord from the primary ac power source Your 2185 retains its previous configuration when powered up again Chapter 4 Operation and Configuration MAINTENANCE PHILOSOPHY Preventive Maintenance There is no preventive maintenance necessary on your Telenetics 2185 other than the occasional removal of dust that a have settled on the unit 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 Field repair of defective units or modules is not recommended You can reach Telenetics by calling 949 455 4000 or through our Web site at http www telenetics com Recovery from Anti Streaming Alarm Condition If a subchannel anti streaming alarm indication occurs disable the affected channel using the appropriate FUNCTION Switch 1 1 to 1 5 refer to Chapter 3 Operation Correct the fault in the subchannel device and restore it to the network by re enabling the subchannel 4 1 Telenetics 2185 If all equipment in the network is functi
34. ynchronous data format Down Sets asynchronous data format 2 3 Up Synchronous Data Retiming Buffer in circuit Down Synchronous Data Retiming Buffer bypassed 2 4 Up Disables Anti Streaming Down Enables Anti Streaming 2 5 and 2 6 See Table 3 4 These two switches work together to set Clock Routing 3 4 Telenetics 2185 Table 3 3 Function Switch Two Summary Function Switch Switch Position Function 2 7 Sets main channel RTS DCD transparent Down Straps main channel RTS or DCD ON 2 8 Up Straps main channel inbound CTS ON Down Sets main channel inbound CTS transparent In certain synchronous configurations the internal clock generator is not used and the data rate is determined by the selected external clock source For details refer to the section on function switch segments 2 5 and 2 6 Clock Routing The internal clock generator is also used in asynchronous applications when Data Contention is selected Switch Segment 2 1 Contention Mode Switch 2 1 set to up position Control Signal Contention Switch 2 1 set to down position Data Contention In applications where the subchannel devices toggle control signals set this switch to the up position for Control Signal Contention Where active control signals are not provided set to the down position for Data Contention This selects the RTS or DCD control signal for contention depending on whether the subchannel is configu
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