TC1705 User`s Manual
Contents
1. interface n NOTE SLAVE CLK Switch 3 DTE itis not used DCE when itis on down position it tums on the Slave clock mode RT ST when itis off up position it turns on the Internal clock mode ST Internal clock see table 1 Internal clock off up position Function of Sw3 Ea On down position Figure 3 TC1705 s Front Panel TC 1705 RS 232 TTL User s Manual Rev 2 3 DIP Switch Functions For trouble shooting purpose user can conduct remote loopback and local loopback test TC1705 also has a built in signal generator for user to validate fiber optic link There are two groups of DIP switches one at the front panel the other one is located at the center of the PC board Front Panel Switches There are four DIP switches located at the front panel Usually they are very useful during installation or trouble shooting They are described as follows 222 23 DIP 1 DIP 2 DIP 3 DIP 4 RMTLB DIS ALM LOCLB SLAVE CLK Remote loop back This switch DIP 1 initiates the Remote loop back function The composite optic signal is received from optic RxA and decoded then looped back to optic TxA Local loop back for diagnostic use When DIP 2 is pressed down an electrical signal loop is created the input RS 232 signal pin 2 TxD is looped back to RxD pin3 In the Up position the unit is in the internal clock mode When in the Down p2. Table 2 Optical Specifications Transmitter Laser Receiver Loss Budget Distance LED ELED typical Launch Power 19dBm 850 1310nm Multimode 62 5 125ym 19dBm 1310 1550nm Single Mode 9 125yum LED ELED typical Launch Power 9dBm 1310 1550nm Single Mode 9 125ym PIN Diode typical Sensitivity 34dBm 850 1310nm Multimode 62 5 125ym 34dBm 1310 1550nm Single Mode 9 125ym 850 1310nm MM 62 5 125um 15dB 1310 1550nm SM 9 125um 15dB 850nm Multimode 62 5 125um up to 3km distance 1310nm Multimode 62 5 125um up to 4km distance 1310nm Single Mode 9 125um up to 24km distance 1550nm Single Mode 9 125um up to 30km distance Launch power sensitivity and distance are listed for reference only These numbers may vary RS 232 TTL Signal Cross Referece GD TyDIO O Ry RAD RTS FO O ICTS O O cp Data Terminal Ready gt DTR O C DSR Data setready Figure 4 TC1705 s Signal Cross Reference TC 1705 RS 232 TTL User s Manual Rev 2 3 Optical Redundancy optional If optic redundancy was ordered with the unit figure below applies to its operation Optic redundancy is used to prevent the loss of data transmission in the event an optic cable transmitter or receiver is broken or degraded Should this occur the secondary optic link amp receiver B is enabled automatically thereby preserving the integrity of the communication In t
3. Communications Inc Alarm LED When there is an alarm condition the red ALARM LED will be lit and the RxA LED will also flash to indicate the optic signal has been lost The Alarm will also trigger the dry contact relay switch Optic Cable Types Conventionally fiber optic cable with yellow colored insulation is used for single mode applications gray or orange colored insulated cable is for multimode use If multimode cable is used in a single mode application the test results could be erroneous and confusing Calculating the Fiber Optic Loss Budget The fiber optic link and or the connectors are frequently the source of communication problems If problems are present check the optic connectors and the integrity of the link first Ideally the link should be calibrated for total loss after the installation has been completed This will accomplish two things 1 it will verify that the total loss of the link is within the loss budget of the device and 2 it will provide a benchmark for future testing For example a system that has been tested as having 6dB of signal loss when installed should not suddenly test out as having a loss of 10dB If this were the case however the fiber link or connector would probably be the source of the problem To calculate the loss budget Multimode 850nm i 3 dB loss per km on 62 5 125um cable Multimode 1310nm 2 dB loss per km on 62 5 125ym cable Single Mode 1310nm i 0 5 dB loss per km on 9 12
4. RANA AABANG 10 Optic Cable Types nma AA 10 Calculating the Fiber Optic Loss Budget sssssssssussnsnnnunnnnnnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnan nannaa 10 RS 232 TTL Cable Venfica Po Nana 10 Chapter 4 Bench Test NGALAN NAKA AAAAAAA 11 OL LC PAA AA AA AA 11 Test Equipment Requirements kam GA 11 Pre Installaton TESS iicscicesdssevssdivasincosisesssdnnviederteaesnsdavanisusnacesssaanstedsatensisedauentvantaisssvecisteseateraisasiesns 11 Local Optic Loopback Test tana 11 Remote Optic Loopback Testre rena nines sssanevassninncadsiaincaeastndcsanondevdianiaciicsnitanraniniannsi 12 Bench Test With Built In Signal Generator aaa 13 Other Testing Considerations ssssssssussusansunnnnnnnnnnnnnnnnnnannnnnnnnnnnnnnnnnnnnnannannannnnnnnannnnnnnan nannan annnnnan nanana 14 Chapter 5 Component Placement sssssssssssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn aa 15 Chapter 6 Specifications a NGANGA NABA 16 Appendix A assesi a anana reer err ter rer Pee AA er ces errr rr creer Trrecer ce 17 Ret rn Policy pani 17 Warranty estat anunnanas ANING 17 Append B cirea aa aaa aaa aAa a aaa aa a denen NANANA 18 Typical TC 1705 RS 232 Application with Telephone Modem 18 TC 1705 RS 232 TTL User s Manual C hapter 1 Overview Rev 2 3 Description The TC1705 is an economical and dependable fiber optic modem with an ANSI RS 232 TTL interface It is available in either rack mount or stand alone versions the rack mount vers
5. and record the optical cable loss This reading will both verify the integrity of the system and provide a benchmark for future troubleshooting efforts see Chapter 3 Troubleshooting Optic Cable Verification If the Rx A LED on the front panel is flashing or off this is an indication that the optic signal is not being correctly received Usually unsecured fiber optic connectors or faulty cable are to blame A good connection is indicated by the Rx A LED on the front panel being solidly lit This indicates that the receiving cable is correctly connected to the remote unit s optic TxA On Dual Optics Models the same applies to RxB and TxB Dual Optics Models will automatically switch to optic RxB if optic RxA is not receiving a valid signal This automatic switchover enables the user to verify the B fiber connection by simply disconnectiong the A fiber connection thereby verifying the optical redundancy capability of the unit Dual Optics is an optional feature TC 1705 RS 232 TTL User s Manual Chapter 3 Troubleshooting Reva General Typically most problems encountered during installation are related to an improperly wired RS 232 TTL cable or a break in the integrity of the fiber optic link cable or connectors All LEDs are Off If no LEDs are lit on the unit check the DC power supply terminal block connector plug and or power source If the problem persists contact the Technical Support Department at TC
6. decrease optic power A Optic TxB optional Optic RxB optional Optic TxA Optic RXA SW1 Internal DIP Switches 4 a Legend X ON Used to configure TC1705 as a This table shows the DCE left or DTE right device Internal Clock speed enable secondary optic receiver when the TC1705 is enable signal generator 8 select DCE DB25 pin 15 internal clock rate 0n pin SW1 1 enable signal generators SW1 2 configure TC1705 s interface to DTE see text for details SW1 3 enable secondary optic receiver SW1 4 enable async mode For Oscillator 8 192Mhz 8k 9 6k rie 19 2K 32k 38 4k 56k gas 128k 256k atek 1 024M 2 048M HM 20M Hz Hz Hz Hz Hz Hz Hz Hz Figure 10 Component Locations on TC1705 s Internal PCB with optional Dual Optics 5 TC 1705 RS 232 TTL User s Manual Chapter 6 Specifications a Data Rates Asynchronous DC OHZ Lu DC to 128Kbps Synchronous DC 0H2Z La DC to 64Kbps Optical Transmitter 1 een LED ELED Receiver LAG Pin Diode Wavelength eee 850nm 1310nm Multimode dadutnsausaaveduvantandcasas A AA ANAN 1310 1550nm Single Mode Connector uma ST optional FC Loss Budget uuuua nanana 15dB Multimode 850nm 1310nm 62 5 125 m NA a T 15dB Single Mode 1310 1550nm 9 125ym Electrical Interface aaa RS 232 TTL Connector ua DB25 Female TTL Input Voltage Maximum Rating Uu ee 0 5V to 7V Recommended TTL Input Voltage u s Vin High AARAL 2 0V to 5V Vin LOW
7. power s terminal block connector The installation procedure is as follows 1 Connect your DTE DCE Device to the DB25 Connector Check the Pin Assignments and verify your application s data rate Shielded cable is recommended 2 Connect the optic cables Connect the local unit s optic TxA to the remote unit s optic RxA Connect the local unit s optic RxA to the remote unit s optic TxA do the same for TxB and RxB on Dual Optics Models 3 Connect the power plug The plug can be connected into either power terminal A or B check for proper polarity The unit is equipped with power redundancy By plugging a second power supply to the spare power terminal power redundancy is enabled Verify that the power A and or B LED is illuminated 4 Turn On your DTE DCE device TxD RTS and DTR LEDs should be illuminated 5 Check the remote unit s RxD amp DSR LEDs RxD CTS CD and DSR LEDs should be illuminated when there is data signal being received 6 Check the Rx A LEDs When a good optic signal is received the Rx A LED on the corresponding unit should illuminate Check Rx B LED when Optic TxB and Optic RxB are in use Dual Optics model only TC 1705 RS 232 TTL User s Manual Rev 2 3 RS 232 F O RS 232F 0 MODEM MODEM DTE DCE DTE DCE DEVICE r DEVICE Figure 6 Typical Point to Point RS 232 TTL Application After installation is complete it is an excellent idea to verify
8. ummm AA OV to 0 8V System Bit Error Rate aaa 1 in 10 or better Indicators System Status u s ALARM PWR A PWR B Vcc Rx A Rx B USE B DTE Electrical Signal Status sssr RxD TxD RTS CTS CD CD TxCLK RxCLK Optic Signal Status u am aaa anan TxA RxA for Dual Optics TxB and RxB Power Source S tA are PAA 12V to 14VDC 500mA typical Optional uma 24VDC 48VDC or 115 230VAC with an external power cube Temperature Operating ou 10 C to 50 C Hi Temp Version optional e 12 C to 70 C Storage aa AA 40 C to 90 C Humidity ee 95 non condensing Physical Rackmount Card Height 1 eee 17 7 cm 7 0 Width vost einen 3 2 cm 1 25 Depth L A 14 8 cm 5 75 Weight see 192 gm 5 44 oz ST is a trademark of AT amp T C ontact factory for loss budget requirements greater than 15dB Laser version 16 TC 1705 RS 232 TTL User s Manual Rev 2 3 Appendix B DB9 to DB25 adapter List of Matenals Included 1 C1705 s 2 DB9 to DB25 adapter 3 RS 232 Null Modem Adapter RS 232F 0 MODEM RS 232 NULL MODEM 22 ADAPTER 2 Straight through cable EXTE NAL PONE MODEM 232 Application with Telephone Modem Figure 11 Typical TC1705 RS 18
9. 5um cable Single Mode 1550nm 0 4 dB loss per km on 9 125um cable These numbers are listed for reference only We recommend an OTDR reading be used to measure actual link loss RS 232 TTL Cable Verification 1 Make sure the electrical signal connections match the pin assignments for the device refer to page 3 for DCE DTE user equipment pin connections Verify signal connections by checking the status LEDs on the front panel of the TC1705 Verify that the pin signal connections match the appropriate LED responses see Figure 3 2 Conduct a Local Loopback Test DIP switch 2 set to the down on position to help isolate a RS 232 TTL interface problem This will loopback the electrical signal to the DTE DCE device for verification 3 Besure that all switches are set correctly All the front panel DIP switches should be in up off position All the SW 1 Internal DIP Switches should be in the up off position If the TC1705 is an Async unit SW1 4 switch 4 of the Internal DIP Switches should be in the down on position A0 TC 1705 RS 232 TTL Chapter 4 Bench Tests ae General It is highly recommended to conduct a bench test before actual installation A bench test will allow the user to get familiar with all the functions and features of the TC1705 in a controlled environment Knowledge of the TC1705 s functions and features will facilitate installation and troubleshooting efforts later on Test Equipment Requirem
10. M LOCLB SLAVE CLK status for received electrical signals from remote unit RxD RD received data CTS clear to send CD carrier detect DSR data set ready Switches to initiate down position following tests and function RMTLB turn on remote unit s loopback LOCLB turn on local electrical interface s loopback SLAVE CLK Tums on Slave Clock mode RT ST DISALM disable alarm buzzer and relay Status for electrical signal from local user s device TxD transmit data RTS request to send DTR data terminal ready o D Alam Indicator Power Status amp received optic signal status Operating Voltage Status amp DTE indicator Alarm red RxA off normal operation so fla R xB sol id optic received OK from primary side A side sh optic signal lost id optic received OK from secondary side B side solid major alarm condition optic input lost flash remote loopback activated by remote unit PWR A DC power supply from PWR A jack PWR B DC power supply from PWR B jack flash optic signal lost or B side is not enabled Vcc 5 VDC operating voltage power supply USE B solid secondary optic signal is being used due to primary optic signal lost off secondary optic receiver is not enabled or primary optic signal is being used DTE the electrical signal interface at the rear panel 5 DB25 female connector is a DTE
11. TC1705 RS 232 TTL SYNC ASYNC FIBER OPTIC MODEM User s Manual MODEL SIN DATE Notice Although every effort has been made to insure that this manual is current and accurate as of date of publication no guarantee is given or implied that this document is error free or accurate with regard to any specifica tion TC Communications Inc reserves the right to change or modify the contents of this manual at any time without prior notification COPYRIGHT 1992 2002 ALL RIGHTS RESERVED TC 1705 RS 232 TTL Table of Contents Rew23 Chapter Overview ana AABANGAN 3 DGS C FID ON T A A TT 3 Electrical Specifications amp Virtual Connections u s 3 LEDs DIP Switches and Connectors uu 4 DIP SWiteh FUNCHONS a NAAANINAG AANGAT 5 Front Panel Switches ia NGANGA NANGANAK 5 SW1 internal PCB Dip Switches ana 5 SW1 internal PCB Dip Switches aaa 6 OpUCal SSC TC ATOMS ANAN AA AA Aa 6 R5 232 TTL Signal Cross Referte cna AGARANG 6 Optical Redundancy optional aaa 7 Dry Contact Relay Alarm Switch u s 7 POWER SUDDIY a 7 Chapter 2 Ins alla Don aNG AKA ATA svanieasaeaund 8 Unpacking the Uni RNGA GINANG AGANG 8 Equipment Location GAGANA AA 8 Installation Procedure Summanpanumaa ENGAGE AA 8 Typical RS 232 TTL point to point application se essences 9 Optic Cable Vern ations NGANGA 9 Chapter 3 Troubleshooting ana GNG NANA 10 GSMS Fea si AGA AA AA AA AA 10 ALLELE DS are Off aNG BANANA KEANNA AG 10 Alam BEB ANNA
12. a AGYNCJSYNE HEER CPIE NONEM BERT Test Set optional PEOPTIC my RxE Figure 7 Local Optic Loopback Test Connection Diagram Remote Optic Loopback Test 1 Connect a second TC1705 unit As with the first unit follow the bench test steps on the previous page When you have completed the Local Optic Loopback Test for the second unit proceed to the next step 2 Set up the bench test as illustrated in Figure 8 on the following page 3 Connect three copper wire jumpers to short loopback the DB25 Female connector on the rear of the remote unit as follows these copper wire connections will loopback the signal at the remote TC1705 Pin 2 SD to Pin 3 RD Pin 4 RTS to Pin 5 CTS Pin 20 DTR to Pin 6 DSR 4 Set the BERT test set to the same or as close to the same data rate as the application you plan to connect to typically 19 2Kbps through 128Kbps Synchronous 5 The data bits should be selected as 8 bits and the data pattern should be set to 2047 on the BERT tester 6 At this point the tester should indicate a Synchronous signal being received if the optical cable and connectors are good and the cable has been connected properly 7 Check that the Rx A TxD RxD RTS CTS DTR DSR and CD LEDs are illuminated If any other LEDs illuminate or flash make sure all DIP Switches on the TC1705 are in the correct position and reset the BERT tester You should not see any bit errors To
13. e unit is DCE Connect the DB25 male adapter check pin assignments on page 3 from the BERT tester to the TC1705 s DB25 female connector on the rear panel Make sure you have the appropriate optical jumper cable with the correct connectors see page 7 Connect one end of a short optical jumper to the optic TxA of the unit being tested and the other end to the optic RxA on the same unit to complete the optical loopback Set the BERT test set to the same or as close to the same data rate as the application you plan to connect to typically 19 2Kbps through 128Kbps Synchronous The data bits should be selected as 8 bits and the data pattern should be set to 2047 on the BERT tester At this point the tester should indicate a Synchronous signal being received if the optical cable and connectors are good and the cable has been connected properly Check that the Rx A TxD RxD RTS CTS DTR DSR and CD LEDs are illuminated If any other LEDs illuminate or flash make sure all DIP switches on the TC1705 are in the correct position and reset the BERT tester You should not see any bit errors To verify this inject an error using the BERT tester to see if it will be recorded by the tester then verify that no additional errors appear after the user injected error 11 TC 1705 RS 232 TTL User s Manual Rev 2 3 Proceed to the Remote Optic Loopback Test DB25 Cable Female_DB25 Modai TC 7O5
14. ents End user equipment required for testing 1 2 3 One BERT Bit Error Rate Tester test set with a DB25 male adapter and appropriate interface module match pin assignments with the diagrams on page 3 Two short optical cable jumpers with appropriate connectors ST or FC Three small copper wire jumpers Pre Installation Tests 1 2 Make sure the appropriate power supply accompanies the TC1705 unit see page 7 To verify that the unit functions properly plug in only the power connector to the terminal be sure to observe correct polarity without having any other cable connections to the unit On the front panel the appropriate green Power A or Power B LED should be illuminated depending on whether you plug into the A or B terminal on the back of the unit Both lights should be on if you utilize power redundancy power is connected to both A and B terminals on the rear panel The ALARM is lit and Rx A LEDs should be flashing The Vcc LED should be illuminated Please note all other LEDs can be in a random state flashing solidly lit or off as only upon proper receipt and transmission of a signal will the TC1705 set its LEDs appropriately for normal operation Proceed to the Local Optical Loopback Test Local Optic Loopback Test 1 2 3 Set up the bench test as illustrated in Figure 7 on the following page Make sure your BERT tester is turned on and configured as a DTE device if th
15. he meantime the Alarm LED will flash and the buzzer will sound to indicate a cable breakage When the unit is equipped with optic redundancy SS the optic transmitter TxA and TxB both becca transmit the same signal to the remote unit It is a up to the remote unit to decide whether RxA or Control RxB should be used as the valid incoming optic mua signal By default RxA is the primary re TC1705 TC1705 ceiver RxB is the stand by backup Dry Contact Relay Alarm Switch A terminal block connector at the rear panel provides for the Dry Contact Alarm Switch Nor Ra mally in the OPEN position any alarm condition Retcsiomsl fg Rx will force the switch to a CLOSED position This relay can be used in conjunction with an external pa device to signal an alarm condition TC1705 TC1705 Power Supply The TC1705 consumes very low power The input voltage is from 12V to 14V DC and current is 500mA max You may use an external power adapter with the following specifications 12V DC 800mA positive polarity at the left terminal when viewed from the rear panel The power plug can be connected into either power jack on the rear panel Because the TC1705 is equipped with a built in power redundancy feature the POWER A or POWER B LEDs on the front panel will illuminate according to which power source the unit is drawing from If power redundancy is utilized both LEDs will light For units with the 48V DC power
16. ion can be converted to the stand alone version with the addition of a sheet metal box The TC1705 can communicate at distances up to 4 km using Multimode optics and up to 30 km using Single Mode optics TC1705 s design utilizes advanced FPGA Field Programmable Gate Array technology to increase reliability and flexibility Electrical Specifications amp Virtual Connection Interface RS 232 TTL Data Rates Asynchronous DC 0Hz to 128Kbps Synchronous DC 0Hz to 64Kbps Connector DB25 Female DCE or DTE configurable Pinouts TC1705 Virtual Connection Connect two DTE devices TCA 705 TETE DE 5 fema e DCE D326 l rrale DCE ta DTF covied Tx Date x Daca To DTF cevis ATS lt lt CTS D3D JIK DSR 3 D53 SOT 50Tir ena dik FRAN GND FRAME SND SIGNAL GNI 7 F oe Cable SIGNAL GNC Figure 1 TC 1705 s Asynchronous Pin Assignments amp Virtual Connections TC 1705 Virtual Connection Connect two DTE devices TC 05 DB25 female DCE io DTF device lt lt TO170S DB24 temale DCE Tx Data Rx Data Cob SO THiexterval nerk SER Rx sles SCTinetial clock RAVE GND FRAME GND 8 GNA GND LIDE 7 SICNAL GND Figure 2 TC 1705 s Synchronous Pin assignment amp Virtual Connections TC 1705 RS 232 TTL User s Manual Rev 2 3 LEDs DIP Switches and Connectors Connector for optional secondary optic link Connector for primary optic link T er7os SYNC ASYNC FIBER OPTIC MODE
17. osition the unit is in slave clock mode The internal clock signal is transmitted to the user s equipment through pin 15 see figures 1 and 2 when the unit is configured as a DCE device Disable dry contact alarm These functions can be initiated from one of four DIP switches accessable from front panel Under normal operation all the switches should be set in UP position SW1 Internal PCB Switches There are other eight DIP switches located at the PC board and can not be accessed from front panel These switches usually only used during installation SW1 1 SW1 2 SW1 3 SW1 4 SW1 5 SW1 6 SW1 7 SW1 8 Enable signal generators This switch initiates the built in Signal Generator function The unit will generatea visual signal to verify optic link Configure TC1705 s interface as a DCE off or DTE on Enable secondary optic receiver Enable async mode Eepe Ee i effel For Oscillator 8 192Mhz fe 2 po n 2 33 Jae 5 tS PL bbl x HI GES a Ponoare IZ Legend X ON This table shows the Internal Clock speed When the TC1705 is DCE on DB25 pin 15 Table 1 TC 1705 RS 232 TTL User s Manual Rev 2 3 SW1 Internal PCB Switches SW1 5 SW1 6 SW1 7 SW1 8 For Oscillator 6 176Mhz BEBEZET tet fa a x x x psf s s 7 8 x X X Px x x x x x x x x X x 6 031k 9 6k 12k 19 2k24 1k 38 44 N A 48k 96k 192k 385k 772M 1 54M 3 087M N A
18. rn on the SIG GEN by sliding SW1 1 switch 1 of the SW1 Internal DIP Switches to the up on postion Turn on the RMTLB by pressing down the DIP switches 1 of Front Panel DIP Switches on the Local TC1705 The TxD RTS and DTR LEDs on the local TC1705 should start blinking Verify that the remote unit s RxD CTS and DSR TxD LEDs also blink indicating receipt of the remote unit s simulated response The CD LED will be solidly lit DEZ5 Cable BG Power Su NG Power Ay 12V lo 14 Fy 12V to ae MBO A b90MA Female D825 Female 0825 Medal 707705 Medal Tor 7035 x28222 TIL X86252 LIL AS NG SYNG ASYNCISYVS EER C TIG MODEN MBER C TIG NODEM optional optional OPTIG ny TxE RxE Figure 9 Signal Generator Bench Test Connection Diagram Other Testing Considerations 1 If front panel DIP switch 3 slave clock is pressed down the received clock signal from the remote unit is used as an internal clock signal and is transmitted to the user s equipment through pin 15 14 TC 1705 RS 232 TTL Chapter 5 Component Placement Pa DB25 female connector for electrical signal connection DRY CONTACT Ca 12 14VDC 500mA ALARM POWER B POWERA TERMINAL BLOCK CONNECTORS INTERFACE MODULE Pababa NIT AAO 8 ABA TAU HAHA wa JP2 8 LOSVE CE T FPGA FPGA configuration chip EEPROM Trim pot to adjust optic launch power Clockwise to increase optic power counter clockwise to
19. supply option a DC to DC converter is installed inside the unit The DC current requirement for the optional 48V DC power supply is 50mA PWR PWR ALARM O O Dry Contact Alarm Relay Connector Terminal Block Connectors DB25 Female for Power Supply A amp B Connector Figure 5 TC 1705 s Rear Panel TC 1705 RS 232 TTL User s Manual Chapter 2 Installation Rev 23 Unpacking the Unit Before unpacking any equipment inspect all shipping containers for evidence of external damage caused during transportation The equipment should also be inspected for damage after it is removed from the container s Claims concerning shipping damage should be made directly to the pertinent shipping agencies Any discrepancies should be reported immediately to the Customer Service Department at TC Communi cations Inc Equipment Location The TC1705 should be located in an area that provides adequate light work space and ventilation Avoid locating it next to any equipment that may produce electrical interference or strong magnetic fields such as elevator shafts heavy duty power supplies etc As with any electronic equipment keep the unit from excessive moisture heat vibration metallic particles and freezing temperatures Installation Procedure Summary The TC1705 is designed for quick and easy installation Before installing however make sure all DIP switches are in the up Off position and double check the polarity at the DC
20. verify this inject an error using the BERT tester to see if it will be recorded by the tester then verify that no additional errors appear after the user injected error a TC 1705 RS 232 TTL User s Manual Rev 2 3 8 At this point both units tested will have passed all electrical and optical tests and will have been verified that they are functioning properly Proceed to the next TC1705 unit to be tested or begin verifying other equipment and cabling in your application if you have not already done so BERT Test Set DB25 Cable oc bt gd Supaly 12 EMMA RS 23Q TTL Medel T1705 por zz RS DRAIT AYYNE EYNAE FISER OPTIC WeDcN optional Maximum Data Rate for this setting on the BERT lester is 128Kbps DC Power Su av To 14 eanimA Pin 2 GD lo Pin 3 AD Fin 4 RTS te Pin 5 GTS Pin 6 DSR to Pin 20 DTR Re 232TT Modei TET 705 Sa AS YN Sg WN roce CPTIC MoocM optional Ply PrOPTic ng p OPTIG 5 TxB RxB TxE RxE Figure 8 Remote Optic Loopback Test Connection Diagram Bench Test With Built In Signal Generator The TC1705 has built in signal generator to simulate a polling device s incoming electrical signal The built in signal generator is a pulse signal indicated by blinking LED The flash rate intentionally reduced for easy visual confirmation 1 Setup the bench test as shown in figure 9 i TC 1705 RS 232 TTL User s Manual Rev 2 3 2 At the local TC1705 unit tu
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