Patton electronic 2073 Network Card User Manual
Contents
1. international power cords DC Power Supply option Model 2073 DC operates in 48 VDC environments and is equipped with a 3 pin terminal strip style con nector 4 3 1 Connecting to an AC Power Source The Universal Interface AC Supply is equipped with a male IEC 320 power connection A domestic US power supply cord is sup plied with the unit at no extra charge To connect the standard or uni versal power supply follow these steps 1 Attach the power cord supplied to the shrouded male IEC 320 connector on the rear of the Model 2073 2 Plug the power cord into a nearby AC power outlet 3 Turn the rear power switch ON 13 4 3 2 Connecting to a DC Power Source The 48 VDC power supply option uses a 3 pin terminal block with spring type connectors Please refer to the Model 1090 Series Service Manual for the power line voltage connections WARNING There are no user serviceable parts in the power supply section of the Model 2073 Fuse replacement should only be performed by qualified service personnel Contact Patton Electronics Technical support at 301 975 1007 via our web site at http www patton com or by e mail at support pation com for more information 14 5 0 OPERATION Once the Model 2073 is properly configured and installed it should operate transparently This sections describes power up read ing the LED status monitors and using the built in loopback test modes 5 1 POWER UP2. Interface Pin Assignments 1 0 WARRANTY INFORMATION Patton Electronics warrants all Model 2073 components to be free from defects and will at our option repair or replace the prod uct should it fail within one year from the first date of shipment This warranty is limited to defects in workmanship or materials and does not cover customer damage abuse or unauthorized modifi cation If this product fails or does not perform as warranted your sole recourse shall be repair or replacement as described above Under no condition shall Patton Electronics be liable for any damages incurred by the use of this product These damages include but are not limited to the following lost profits lost savings and incidental or consequen tial damages arising from the use of or inability to use this product Patton Electronics specifically disclaims all other warranties expressed or implied and the installation or use of this product shall be deemed an acceptance of these terms by the user 1 1 RADIO AND TV INTERFERENCE The Model 2073 generates and uses 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 and tele vision reception The Model 2073 has been tested and found to com ply 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 r
3. Format Transmission Line Clocking Interface Modules Line Rates DTE Rates Async DTE Rates Sync Diagnostics LED Status Indicators Connectors Power Temperature Range Altitude Humidity Dimensions Weight SPECIFICATIONS Synchronous Asynchronous Four Wire unconditioned twisted pair Internal external or Network EIA RS 232 ITU T V 24 RS 232 530 ITU T V 35 and ITU T X 21 256 kbps 9600 14400 19200 kbps 9600 14400 19200 28800 32000 38400 48000 56000 57600 64000 kbps V 54 test modes for LAL and RDL V 52 511 511E BERT pattern generator and detector TD RD CTS CD RTS Synch Error Test Mode RJ 45 on line side DB 25 female M 34 female RJ 45 female or DB 15 female depending upon which serial interface module is installed 90 260 VAC via IEC 320 shrouded male connector 48 VDC option 10 watts 32 122 F 0 50 C 0 15 000 feet up to 90 non condensing 7 3 x 6 6 x 1 62 185mm x 168mm x 41mm 2 02 Ibs 92 kg 19 APPENDIX B PATTON ELECTRONICS MODEL 2073 FACTORY REPLACEMENT PARTS AND ACCESSORIES Patton Electronics Model Description MMA 2d tastes ida V 24 with DB25F IMI Ba Aaeeei RS422 RS530 with DB25F IM1 C oisinnean V 35 with M34F IM1 D a X 21 with DB15F MIE rierien V 35 with DB25F IMA F ula G 703 with RJ45 Maan na Ethernet Bridge Module MIen 4 port Ethernet Hub Module IMT Jiii Voice Data Module O805US sacii iins American Powe
4. INSTALLATION The Model 2073 is designed for 4 wire full duplex communication over a co directional 64 kbps G 703 clear channel network dedicated twisted pair This section describes the proper connection of the line interface the DTE terminal interface and AC DC power NOTICE The G 703 line surge protection on this unit was installed for circuit protection only By no means does this include the preservation of signal quality during a large surge 4 1 Connecting to a PCM Network Channel The RJ 45 port on a model 2073 is pre wired for direct connetion to the G 703 PCM network Connect the RJ 45 port of the Model 2073 to the RJ 45 jack provided by your digital service carrier using a straight through twisted pair cable between 19 and 26 AWG The signal pin relationships are shown in Figure 4 below Figure 4 64K G 703 Interface 4 2 Connection Over Private Twisted Pair If you wish to connect the Model 2073 to another Model 2073 or compatible G 703 device over private twisted pair make the connec tion between the two devices using a crossover cable pinned accord ing to the diagram below RJ 45 Cable 8 Wire SIGNAL PIN PIN SIGNAL RX 5 TX Ha Q 4 TX TX 1 RX a dba 2 RX Shield geaca 3 Shield Shield 6 Shield 4 2 CONNECTING THE SERIAL PORT The serial port interface on the Model 2073 uses interchangeable QuikConnect Modules Each QuikConnect Module has a 50 pin card edge con
5. Model 2073s as well as the communica tion link between them Any characters sent to the remote Model 2073 in the test mode will be returned back to the originating device i e characters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote Model 2073 and looped back See figure 7 below dko ZO JE _ y Figure 7 Remote Digital Loop To perform an RDL test follow these steps 1 Activate the RDL by moving the front panel toggle switch DOWN to remote 2 Perform a bit error test BERT using the internal V 52 gener ator as described in Section 5 4 or using a seperate BER Tester If the BER test indicates a fault and the Local Line Loopback test was successful for both Model 2073s you may have a problem with the twisted pair line between the modems You should then check the twisted pair line for proper connections and continuity 5 3 3 BIT Error Rate V 52 Diagnostics The Model 2073 offers a V 52 Bit Error Rate BER 511 test pat tern This test pattern may be invoked along with the LAL and RDL tests to evaluate the unit s and the communication links When a 511 test is invoked the 2073 generates a pseudo random pattern of 511 bits using a mathematical polynomial The receiving Model 2073 then decodes the received bits using the same polynomi al If the received bits match the agreed upon pseudo random pattern then the 2073 s and the commun
6. To apply power to the Model 2073 first be sure that you have read Section 4 3 and that the unit is connected to the appropriate power source Then power up the unit using the rear power switch Figure 5 below shows the front panel location of each LED A description of the each LEDs funtion is below Figure 5 TE PRITUN Model 2073 KiloLink I 64k G 703 Access Converter Power TD RD CTS CD DTR Figure 5 Model 2073 Front Panel 5 2 LED STATUS MONITORS The Model 2073 features13 front panel LEDs that monitor power the DTE signals network connection and test modes The figure below shows the front panel location of each LED Following the fig ure below is a description of each LEDs function TD amp RD Glows yellow to indicate an idle condition of Binary 1 data on the respective terminal interface sig nals Green indicates Binary O data CTS Glows green to indicate that the Clear to Send sig nal from the modem is active CD Glows yellow if no carrier signal is being received from the remote modem Green indicates that the remote modem s carrier is being received RTS Glows green to indicate that the Request to Send signal from the terminal is active ER flashes once to indicate that a CRC error has occurred during normal operation or bit errors have occurred during 511 511E tests 15 TM glows yellow to indicate that the Model 2073 has been placed in Test Mode The unit can be placed in test mode by the
7. USER MANUAL MODEL 2073 Kilo Link 64k G 703 Access Converter Rate Adapter pE PATTON mg Flecironics To ISO bagi ie SALES OFFICE OC Revised 12 4 99 301 975 1000 4 TECHNICAL SUPPORT 301 975 1007 http www patton com TIFIED An IS0 9001 Certified Company TABLE OF CONTENTS Section 1 0 Warranty Information wees ainda 2 1 1 Radio and TV Interference 1 2 CE Notice 1 3 Service 2 0 General Informations aa ined heed 4 2 1 Features 2 2 Description 8 0 COMfQUIATION seiras iG ie kcal aeaa ined NG Ai 5 3 1 Configuring the Hardware DIP Switches 3 1 1 Configuration DIP Switch Set S1 3 1 2 Configuration DIP Switch Set S2 4 0 Installation cccccccceecceeeseeseeeeee 4 1 Connecting the Twisted Pair Interface 4 2 Connecting the Serial Port 4 2 1 Changing QuikConnect Modules 4 2 2 Connecting a DTE Device 4 2 3 Connecting a DCE Device 4 2 4 Configuring the X 21 QuikConnect Module 4 3 Connecting Power 4 3 1 Connecting to an AC Power Source 4 3 2 Connecting to a DC Power Source 5 0 Operation 0 eeececeeseeeeteeeeeeteeeees 5 1 Power Up 5 2 LED Status Monitors 5 3 Test Modes 5 3 1 Operating Local Analog Loopback LAL 5 3 2 Operating Remote Digital Loopback RDL 5 3 3 Using the V 52 BER Test Pattern Generator Appendix A Specifications Appendix B Factory Replacement Parts and Accessories Appendix C
8. arise concerning the installation or use of your Model 2073 Technical Service hours 8AM to 5PM EST Monday through Friday 2 0 GENERAL INFORMATION Thank you for your purchase of this Patton Electronics product This product has been thoroughly inspected and tested and is warrant ed for One Year parts and labor If any questions or problems arise during installation or use of this product please do not hesitate to con tact Patton Electronics Technical Support at 301 975 1007 2 1 FEATURES e Bi directionally converts V 24 X 21 V 35 or 10 BaseT to co direc tional G 703 LED indicators monitor Test Mode and Synchronization e Internal external or network clocking options e Test Mode controlled by switch or by local DTE V 24 and V 35 Versions Only e Complies with CCITT ITU G 823 Jitter Control Specifications e Built in surge protection and transformer isolation e Point to Point distance up to 5250 ft 1600m on 24 AWG twisted pair e 120 ohm twisted pair network termination 2 2 DESCRIPTION The Patton Model 2073 standalone interface converter rate adapter allow a synchronous V 24 V 35 X 21 or ethernet device to communicate bi directionally over the G 703 co directional PCM net work Supporting internal external DTE timing or G 703 network gen erated timing the Model 2073 is perfect for networking applications that require speeds of 9600 bps to 64 kbps The Quick Connect style of interchangeable interface modules for t
9. determine the source of clocking across the G 703 connection Therefore this option must be defined in both Asynchronous and Synchronous DTE applications External transmit clock source is not a valid setting for asynchronous applications Switch S1 8 Local V 54 Preparatory Phase Reception Enable Disable Use switch S1 8 to control the reception of the V 54 remote digital loopback preparatory phase bit pattern by the local Model 2073 When this switch is On the local 2073 will respond to any V 54 loopback requests that are received from the G 703 network This is the normal setting This setting will allow the local Model 2073 to enter V 54 loop back when a valid V 54 preparatory phase bit pattern is received from the G 703 network V 54 Prep Phase Reception S1 8 Disabled Off Enabled When 51 8 is Off the local Model 2073 will ignore any V 54 loop back requests that are received from the G 703 network This mode can be used to prevent the local Model 2073 from entering V 54 loop back mode indadvertently due to bit streams that resemble the V 54 preparatory phase pattern Even if S1 8 is Off the local Model 2073 may still initiate a V 54 loopback request 3 1 2 Configuration DIP Switch Set S2 S2 Summary Table Function Timing Mode BPV Transmit Control Front Panel Switch DTE Test Mode On Acknowledged Reserved Reserved Reserved Reserved Switch S2 1 Clear Channel or Octet Timing Mod
10. e Use Switch S2 1 to control the G 703 timing mode When S2 1 is set to the Off position a clear channel mode of operation is select ed In this mode only user data is transmitted to and from the DTE interface at any one of the data rates mentioned in section 3 1 1 When S2 1 is set to the On position 128K octet timing mode is Clear Channel or Octet Timing Mode Clear Channel Mode Octet Timing Mode selected In this mode 64 kbps octet timing information is embedded within the 64 kbps user data thus creating a 128 kops synchronous data stream to and from the DTE NOTE Octet timing mode requires synchronous 128 kbps DTE operation When octet timing mode is selected S2 1 On all data rate selection switch es are ignored Switch S2 2 G 703 Bi Polar Violation BPV Transmit Control Use switch S2 2 to determine whether or not the Model 2073 will insert BPV s into the transmitted G 703 data stream BPV Transmit Behaviour BPVs not inserted into G 703 data stream BPVs insterted into G 703 data stream Switch S2 3 Front Panel Switch Enable Disable Use Switch S2 3 to disable or enable the front panel switches Front Panel Switch Operation Disabled Enabled Switch S2 4 DTE Test Mode Request Enable Disable Use Switch S2 4 to determine whether or not the Model 2073 will respond to test mode requests LAL or RDL from the DTE DTE Test Mode Requests gorea Of Acknowledged 4 0
11. easonable protection from such interference in a commercial installation However there is no guarantee that interfer ence will not occur in a particular installation If the Model 2073 does cause interference to radio or television reception which can be deter mined by disconnecting the unit the user is encouraged to try to cor rect the interference by one or more of the following measures mov ing the computing equipment away from the receiver re orienting the receiving antenna and or plugging the receiving equipment into a dif ferent AC outlet such that the computing equipment and receiver are on different branches 1 2 CE NOTICE The CE symbol on your Patton Electronics equipment indicates that it is in compliance with the Electromagnetic Compatibility EMC directive and the Low Voltage Directive LVD of the European Union EU A Certificate of Compliance is available by contacting Technical Support 1 3 SERVICE All warranty and non warranty repairs must be returned freight prepaid and insured to Patton Electronics All returns must have a Return Materials Authorization number on the outside of the shipping container This number may be obtained from Patton Electronics Technical Service at tel 301 975 1007 email support patton com www http www patton com NOTE Packages received without an RMA number will not be accepted Patton Electronics technical staff is also available to answer any questions that might
12. he 2073 allow various physi cal and electrical interfaces to connect to the 64K synchronous G 703 network A 120 ohm twisted pair telephone port provides the interface for the G 703 network Additionally 75 ohm terminations can be made using the Patton Model 460 G 703 balun Diagnostics include Local Loopback and G 703 Loopback testing Synchronous clock jitter is attenuated in accordance with the G 823 specification 3 0 CONFIGURATION The Model 2073 is equipped with two sets of eight DIP switches which allow configuration of the unit for a wide variety of applications This section describes switch locations and explains all possible con figurations 3 1 CONFIGURING THE HARDWARE DIP SWITCHES The 16 external switches are grouped into two eight switch sets and are externally accessible from the underside of the Model 2073 Front LI L Rear Figure 1 Underside of Model 2073 Showing Location of DIP Switches The two sets of DIP switches on the underside of the Model 2073 will be referred to as S1 and S2 As Figure 2 shows the orientation of all DIP switches is the same with respect to ON and OFF positions ON ON e Y Figure 2 Close Up of Configuration Switches all sets are identical in appearance 3 1 1 Configuration DIP Switch Set S1 DTE Data Rate On DTE Data Rate On DTE Data Rate On DTE Data Rate On T
13. ication link s are functioning proper ly 17 511 Initiates a built in 511 bit pseudo random pattern generator and detector 511 with Errors Initiates a built in 511 bit pseudo random pattern generator and detector The test pattern generator also injects intentional errors approximately once per second causing the Error LED to blink To perform a V 52 BER test follow these steps 1 Locate the toggle switch group on the right side on the front panel and place it in the middle where it is marked Normal This acti vates the V 52 transmission and reception of the selected test pattern If there are errors in the received patt ern the error LED will blink accordingly 2 If the above test indicates no errors are present move the toggle switch UP to 511 E activating the BER test with intentional errors If the test light is working properly the local modem s red error LED will blink approximately once per second NOTE The above V 52 BER tests can be used independently of the Remote Digital Loopback tests This requires two opera tors 1 to initiate and monitor the tests at the local Model 2073 and 2 to do the same at the remote Model 2073 In this case the test pattern sent by each Model 2073 will not be looped back but will be transmitted down the line to the other Model 2073 While one operator initiates test the other monitors for errors 18 APPENDIX A PATTON ELECTRONICS MODEL 2073 Transmission
14. is NOTE The card edge connector should meet the socket when it is almost all the way into the chassis If you encounter a lot of resistance remove the module and repeat steps 2 amp 3 4 With the card edge contacts aligned with the socket firmly seat the module by using your thumbs to apply pressure directly to the right and left edges of the module faceplate Applying moderate and even pressure should be sufficient to seat the module You should hear it click into place 5 To secure the module in place push the thumbscrews into the chassis and turn the screws clockwise to tighten 4 2 2 Connecting to a DTE Device The serial port on most QuikConnect interface modules all except the X 21 module is hard wired as a DCE Therefore these modules want to plug into a DTE such as a terminal PC or host When making the connection to your DTE device use a straight through cable of the shortest possible length we recommend 6 feet or less When purchasing or constructing an interface cable please refer to the pin diagrams in Appendix C as a guide 4 2 3 Connecting to a DCE Device If the Model 2073 s QuikConnect interface module is hard wired as a DCE all except the X 21 module you must use a null modem cable when connecting to a modem multiplexer or other DCE device This cable should be of the shortest possible length we recommend 6 feet or less When purchasing or constructing a null modem i
15. local user or by the remote user SYNC Glows green to indicate a valid G 703 connection 5 3 TEST MODES The Model 2073 offers two V 54 loop diagnostics Local Analog Loopback and Remote Digital Loopback These tests can be activated physically from the front panel or via signals on the QuickConnect interface 5 3 1 Operating Local Analog Loopback LAL The Local Line Loopback LAL test checks the operation of the local Model 2073 and is performed separately on each unit Any data sent to the local Model 2073 in this test mode will be echoed returned back to the user device i e characters typed on the key board of a terminal will appear on the terminal screen CA Figure 6 Local Line Loop To perform a Local Analog Loopback test follow these steps 1 Notify the G 703 Service provider that you wish to perform a G 703 Loop test 2 Move the front panel toggle switch UP to Local 3 Verify that the data terminal equipment is operating properly and can be used for a test 4 Perform a V 52 BER bit error rate test as described in Section 5 3 3 If the BER test equipment indicates no faults but the data terminal indicates a fault follow the manufacturer s checkout procedure for the data terminal Also check the interface cable between the terminal and the Model 2073 16 5 3 2 Operating Remote Digital Loopback RDL The Remote Digital Loopback RDL test checks the performance of both the local and remote
16. nector on one side and a serial port interface on the other The drawing below shows how a QuikConnect Module plugs into the back of the Model 2073 Figure 4 below shows how a QuickConnect Module plugs into the back of the Model 2073 Figure 5 Installation of Model 2073 Plug in Serial Interface Module 4 2 1 Changing QuikConnect Modules When you purchase a particular version of the Model 2073 it should be shipped to you with the appropriate QuikConnect Module already installed If you need to install a different QuikConnect Module follow these steps Removing the Existing QuikConnect Module 1 Turn the power switch off Leave the power cord plugged into a grounded outlet to keep the unit grounded 2 Loosen the two thumbscrews on the module by turning them counterclockwise 3 Grasp the two thumbscrews and gently pull the module from the unit Apply equal force to the thumbscrews to keep the module straight during the removal process 11 Installing the New QuikConnect Module 1 Make sure the power switch is off Leave the power cord plugged into a grounded outlet to keep the unit grounded 2 Hold the module with the faceplate toward you and align the module with the guide slots in the rear panel of the Model 2073 3 While keeping the module s faceplate parallel with the Model 2073 rear panel slide the module straight in so that the card edge contacts line up with the socket inside the chass
17. nterface cable use the pin diagrams in Appendix C as a guide 12 NOTE Pin out requirements for null modem applications vary widely between manufacturers If you have any questions about a specific application contact Patton Electronics Technical Support 4 2 4 Configuring the X 21 QuikConnect Module The serial port on the X 21 QuikConnect Module is default wired as a DCE but may be switched to a DTE This is done by reversing the orientation of the DCE DTE strap as described below To reverse DCE DTE orientation remove the module according to the instructions in Section 4 2 1 The DCE DTE strap is located on the bottom side of the module s PC board The arrows on the top of the strap indicate the configuration of the X 21 port for example if the DCE arrows are pointing toward the DB 15 connector the X 21 port is wired as a DCE Reverse the DCE DTE orientation by pulling the strap out of its socket rotating it 180 then plugging the strap back into the socket You will see that the DCE DTE arrows now point in the opposite directions showing the new configuration of the X 21 port Reinstall the module according to the instructions in Section 4 2 1 4 3 CONNECTING POWER The Model 2073 is available with two power supply options Universal Interface AC Power Supply option Model 2073 Ul operates in environments ranging from 100 to 253 VAC with no re configuration necessary see Appendix B for available domestic and
18. r Cord 0805EUR 1152m European Power Cord CEE 7 OB05UK viscid United Kingdom Power Cord O805AUS 0c cece Australia New Zealand Power Cord 0805DERN a Denmark Power Cord 080S FR aan France Belgium Power Cord 0805IN sitroen India Power Cord 0805 Po AA AA Israel Power Cord OBOSUAP aaa Japan Power Cord 01510153S AA Switzerland Power Cord O7M1090SVC 000 1090 Series Service Manual 20 APPENDIX C PATTON ELECTRONICS MODEL 2073 INTERFACE PIN ASSIGNMENT RS 232 RS 530 Interface Pin Description Pin OONOAKRWND PO N NN NN AH AH AH AH AaB Bea aaa AKON O O DND UKAOAON O DB 25 Female Connector DCE Configuration Signal FG Frame Ground TD Transmit Data RD Receive Data RTS Request to Send CTS Clear to Send DSR Data Set Ready SGND Signal Ground CD Carrier Detect RC Receive Timing B CD Carrier Detect B XTC External Transmit Clock TC Transmit Clock B CTS Clear to Send TD Transmit Data B TC Transmit Clock A RD Receive Data RC Receive Timing LLB Local Line Loop RTS Request to Send DTR Data Terminal Ready DL Remote Digital Loop DSR Data Set Ready DTR Data Terminal Ready XTC External Transmit Clock TM Test Mode 21 APPENDIX C PATTON ELECTRONICS MODEL 2073 INTERFACE PIN ASSIGNMENT Continued V 35 Interface M 34F Female Connector DCE Configuration Pin Signal m E AE SGND Signal Gro
19. ransmit Clock Source On N Transmit Clock Source oral etwork Normal Reserved V 54 Prep Phase Reception On Enabled Switches S1 1 thru 51 4 DTE Data Rates The DTE synchronous and asynchronous data are determined by the combined switch settings of S1 1 S1 2 S1 3 and S1 4 The follow ing table lists all the possible switch combinations and the correspon ding DTE data rates ma o on on on to2 on of or on 28 8 Off 32 on or on on 38 4 se on on of on 576 on on on o 64 o on on o NOTE The four data rate configuraton switches are ignored when Octet Timing Mode is selected S2 1 is set to the On position D8 1 In Octet Timing Mode the data rate defaults to 128kbps NOTE2 Asynchronous rates are 9600 14 400 and 19 200 To run in asynchro nous mode set the 2073 for 64K synchronous to over sample the data bits Switches S1 5 and S1 6 Transmit Clock Source Use Switches S1 5 and S1 6 to configure the 2073 transmit clock source In campus applications in which two Model 2073s operate as short range modems set one unit for internal or external clock and the other unit for Network Campus Clock When the Model 2073 termi nates a 64kbps G 703 line and provides a serial interface to customer premises equipment set the unit for Network Normal Clock Transmit Clock Source Off External Off Network Normal NOTE Switches S1 5 and S1 6
20. und Canaan nh RTS Request to Send BAPER E AN CTS Clear to Send E a DSR Data Set Ready Baan E CD Carrier Detect m ARO DTR Data Terminal Ready AA LLB Local Line Loop M seccsseesscaccveeuevesercie TM Test Mode N anakan RDL Remote Digital Loop TD Transmit Data Raga nia RD Receive Data Saan TD Transmit Data B AA E RD Receive Data B Uintia XTC External Transmit Clock NA AA RC Receive Timing Wap n XTC External Transmit Clock Keanna salansan RC Receive Timing M inamin aNG TC Transmit Clock A AA da TC Transmit Clock B 22 APPENDIX C PATTON ELECTRONICS MODEL 2073 INTERFACE PIN ASSIGNMENT Continued X 21 Interface DB 15 Female Connector DTE DCE Configuration Pin Signal Manahan E Frame Ground Qin baie ees T Transmit Data A Degen det dish C Control A Wickit eaves R Receive Data A Dirk Seton aces ees Indication A ee S Signal Element Timing A Tiree has ela BT Byte Timing A Gaeta teats oan SGND Signal Ground O Una Rana ee T Transmit Data B TO a pagan C Control B Tigas reregan R Receive Data B APR Indication B I3 saad S Signal Element Timing B La BT Byte Timing B 23
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