Patton electronic 2701/B Network Card User Manual
Contents
1. USER MANUAL MODEL 2701 B C D G 703 G 704 NTU with EIA 530 V 35 X 21 Interfaces DE PATTON MA ElectronicsTo ISO Part 07M2701 X SALES OFFICE Doc 086101U Rev B 301 975 1000 KU Revised 1 6 05 TECHNICAL SUPPORT R SSES 301 975 1007 An ISO 9001 Certified Company CONTENTS 1 0 1 1 1 2 1 3 2 0 2 1 2 2 3 0 3 1 4 0 4 1 4 2 4 3 5 0 5 1 5 2 5 3 A 1 A 3 A 4 Warranty Information ooonncccconcnnnccnnonnccnnananonnnnannnnnnnanrrrenannnnennans 4 Radio and TV Interterence es 4 CE erter 4 A Se re A nar an ee KALA BAOG 5 General Information ancianas 6 Ao nee oser des uso 6 Bi e 6 CONTQUIATION cai 7 DIP Switch Configuration EE 7 Switch SW1 1 through SWT 5 iii 8 SW1 6 and SW1 7 Clock Modes 9 SW1 8 Enable Disable Loop Tests from DTE 10 Switch SW2 1 Line Coding HDB3 default 10 Switch SW2 2 CRC 4 Multiframe Xa 11 Switch SW2 3 Data Imvereion aa 11 Switch SW2 4 Remote Digital Loopback Type 12 Switch SW2 5 Front Panel Switches Rennen 12 Switch SW2 6 V 54 Response Disabled default 12 Installation ans 13 Connecting to he 2032hNetwork a 13 Connecting the 2701 D X 21 version Dual Coaxial Cable 75 ohm to the G 703 Network ooooooonccccccncnccccccncconccncnnnononnnos 13 Opening the Caee a 13 Connecting the Twisted Pair 120 ohm to the G 703 Network 132. on O oF of e Reps Fon om om Of ges n of om Of Of 1984kbps i on on ou of Clear Channel 2048 kops Note When the data rate is set to 2 048Mb s the unit is forced into G 703 mode and it transmits user data on all 32 time lots There is no framing information therefore the CRC4 MF SW2 2 switch is ignored In all other rate settings the unit employs G 704 framing TSO is reserved for signaling SW1 6 SW1 7 Clock Mode Network Received Recovered Network Received Recovered SW1 6 and SW1 7 Clock Modes Use Switches SW1 6 and SW1 7 to configure the 2701 for internal external or receive recover clock mode Network Clock Transmitter timing is derived using the received line signal received recovered from the network Internal Clock Transmitter timing is derived from an internal clock source External Clock Transmitter timing is derived from DTE terminal timing SW1 8 Enable Disable Loop Tests from DTE Use Switch SW1 8 to allow Model 2701 to enter loopback tests when the DTE raises the appropriate loop request pin Response to DTE Loopback Request Enabled Response to DTE Loopback Request Disabled Position Function Factory Default Selected Option SW2 1 Line Coding HDB3 Switch SW2 1 Line Coding HDB3 default Use Switch SW2 1 to control the Network Line Coding options Set these options to be the same as the Line Coding given to you by your Service Pr
3. which can be determined by disconnecting the cables the user is encouraged to try to correct the interference by one or more of the following measures moving the computing equipment away from the receiver re orienting the receiving antenna and or plugging the receiving equipment into a different 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 Union European EU A Cer tificate 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 Materi als Authorization number on the outside of the shipping container This number may be obtained from Patton Electronics Technical Services at e Tel 1 301 975 1007 e Email support patton com e URL http www patton com Note Packages received without an RMA number will not be accepted 2 0 GENERAL INFORMATION Thank you for your purchase of this Patton Electronics product This product has been thoroughly inspected and tested and is warranted for One Year parts and labor If any questions or problems arise during installation or use of this product please do not hesitate to contact Pat ton Electronics Tec
4. Connecting th Serial Port ae 14 Connecting to a DTE Deviee a 14 Connecting to a DCE Device a 15 Configuring the X 21 Interface 01 15 POWERGONMECHON a bicis 15 Universal AC Power 100 240 NACH 15 Bee 16 Opera E 17 Na Dc relies 17 LED Status ee 17 Loop V 54 amp Telco Diagnostics 18 Operating Local Loopback LL 18 Operating Remote Digital Loopback DU 19 Eiee o AA AA AA AA NER SERIE 20 Using the V 52 BER Test Pattern Generator 20 lee le CN 21 NEIWOrK Dala Rale sita 21 DEE seen nee 21 NOMINAL Impedance za 21 Bie a reads 21 AS E e EE 21 AO A UE E 61 al EEN 21 Pl Se A ne ee ee 21 AAA A 21 AY ANIOS e ade 21 IA Are ka ala AA Ada AGA 2 Aldi ere sa 21 AA POWER SUD DIY Elena 22 AO n ale LA RP pee ne RCP eon ne er 22 A 14 Temperature occocccccncccnnoccnonononnnnnnnnnnnonnnnnnnnonononononnnnnnnnnnennnnnnnnnnns 22 FX POS DIMENSIOnSs ee maa Ada 22 B Interface Pin Assignment ssssssssnrnnenne 23 C Interface Pin Assignment 25 D Interface Pin Assignment ss ssssssnsnnnenns 27 E Factory Replacement Parts and Accessories 28 1 0 WARRANTY INFORMATION Patton Electronics warrants all Model 2701 l components to be free from defects and will at our option repair or replace the product should it fail within one year from the first date
5. Locate the 511 511E toggle switch on the front panel of the 2701 and move it UP This activates the V 52 BER test mode and transmits a 511 test pattern into the loop If any errors are present the local modem s red ER LED will illuminate 2 If the above test indicates no errors are present move the V 52 tog gle switch DOWN activating the 511 E test with errors present If the test is working properly the local modem s red ER LED will blink once every second successful 511 E test will confirm that the link is in place and that the Model 2701 s built in 511 generator and detector are working properly Note The above V 52 BER tests can be used independently of the Remote Digital Loopback tests This requires two operators one to initiate and monitor the tests at the local Model 2701 and one to do the same at the remote Model 2701 In this case the test pattern sent by each Model 2701 will not be looped back but will be transmitted down the line to the other Model 2701 While one operator initiates test the other monitors for errors 20 APPENDIX A SPECIFICATIONS A 1 NETWORK DATA RATE 2 048 Mbps A 2 NETWORK CONNECTOR RJ 48C Dual Coax BNC 2701 D A 3 NOMINAL IMPEDANCE 75 120 ohm A 4 LINE CODING Selectable AMI or HDB3 A 5 LINE FRAMING G 703 Unframed or G 704 G 732 Framed A 6 CRC 4 MULTIFRAMING Selectable On or Off A 7 CLOCKING Internal External or Network Receive
6. Recover A 8 TIME SLOT RATE 64 kbps A 9 NETWORK DATA RATES 64 128 192 256 320 384 448 512 576 640 704 768 832 896 960 1024 1088 1152 1216 1280 1344 1408 1472 1536 1600 1664 1728 1792 1856 1920 1984 2048 kbps A 10 DISTANCE Maximum 1 6 km 5 250 ft on 24 AWG Cable A 11 CONFIGURATION Two 8 Position DIP Switches 2 1 A 12 POWER SUPPLY 5 VDC External power supply 100 240 VAC 50 60Hz 0 4A A 13 HUMIDITY Up to 90 non condensing A 14 TEMPERATURE 0 to 50 C 32 to 122 F A 15 DIMENSIONS 9 0L x 5 3W x 2 0H cm 3 5L x 2 1W x 0 78H in 22 APPENDIX B INTERFACE PIN ASSIGNMENT ElA 530 Interface Pin Description DB 25 Female Connector DCE Configuration RTS Request to Send 7 C Receive Timing B i i i i 1 TD Transmit Data B i LLB Local Line Loop 2 I I I Enz MON ES MES RES MEN 22 RS 530 TO RS 530 STRAIGHT RS 530 TO RS 530 CROSS OVER THROUGH CABLE PIN OUT CABLE PIN OUT 5 Pin Pin 1 Shield A 1 Shield A f 2 PO P 3 RD A 3 ma p RE 4 RISDA P BNC mw Je m 8 ca EEE Ze B mow Peso _ la E DTE B 11 m mse 9 iT TXTimingDTE B AR Timing DCE B 17 re No fe NG 14 DE eee 1 NO LE ee 17 RXTimingDCE A 17 TX Timing DTE A 11 mo No IL IJ ane mg neo po Inc 10 2t gt JN 21 22 NC 22 23 NC Jas 24 RX Timing DCE A 17 NE MO SE 24 APPENDIX C INTERFACE PIN ASSIGNMENT V 35 Interface
7. of shipment This warranty is limited to defects in workmanship or materials and does not cover customer damage abuse or unauthorized modification 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 consequential damages arising from the use of or inability to use this product Patton Electronics specifi cally disclaims all other warranties expressed or implied and the instal lation or use of this product shall be deemed an acceptance of these terms by the user 1 1 RADIO AND TV INTERFERENCE The Model 2701 generates and uses radio frequency energy and if not installed and used properly that is in strict accordance with the manu facturer s instructions may cause interference to radio and television reception The Model 2701 has been tested and found to comply with the limits for a Class A computing device in accordance with the specifica tions in Subpart J of Part 15 of FCC rules which are designed to provide reasonable protection from such interference in a commercial installa tion However there is no guarantee that interference will not occur in a particular installation H the Model 2701 does cause interference to radio or television reception
8. CRC 4 Multiframe In framed mode SW2 2 is used for CRC 4 MF When CRC 4 is enabled the unit monitors the incoming data stream for CRC 4 errors It transmits CRC 4 error counts to the transmitting unit When using timeslot zero TSO excessive errors may cause loss of frame or loss of sync If CRC 4 MF is used both units must be set for set for CRC 4 MF Otherwise the one using CRC 4 MF will detect loss of sync az ger _ CRC 4 Disabled CRC 4 Enabled Note When the data rate is set to 2 048Mb s then the unit is forced into G 703 mode and it transmits user data on all 32 time lots There is no framing information therefore the CRC4 MF SW2 2 switch is ignored In all other rate settings the unit employs G 704 framing TSO is reserved for signaling Switch SW2 3 Data Inversion Set Switch S2 3 to determine whether or not the data stream from the local DTE is inverted within the Model 2701 before being passed to the G 703 G 704 network An inverted data stream may be required when you use the Model 2701 to communicate with a G 703 device that inverts the data on the remote end In typical installations data inversion is not necessary ez om Data not inverted Data inverted LI Switch SW2 4 Remote Digital Loopback Type The user can set this switch to select the type of remote loop that will be initiated by the Model 2701 If set to V 54 the Model 2701 will initiate a V 54 loop when Remote Loop is selected by t
9. M 34F Female Connector DCE Configuration na RD Receive Data D Transmit Data B D Receive Data B XTC External Transmit Clock C Receive Timing XTC External Transmit Clock C Receive Timing C Transmit Clock A C Transmit Clock B 25 V 35 TO V 35 STRAIGHT THROUGH CABLE PIN OUT Signal Ground RD A Z O Zi Z A B RD B T B C SCTE B Pin A B o es BD Bo EE AA A V 35 TO V 35 CROSS OVER CABLE PIN OUT Pin Junction Pn B Signal Ground B oo m p p fars Pr mo Ro D I s mo F r mo b oo ma Po v oew u w me Kk x SE M NC Y 26 APPENDIX D INTERFACE PIN ASSIGNMENT X 21 Interface DB 15 Female Connector DTE DCE Configuration Pin Signal TT Gran U R o Transmit Data 10 l l T A C iming A B C B B B 2 APPENDIX E FACTORY REPLACEMENT PARTS AND ACCESSORIES Copyright O 2004 Patton Electronics Company All Rights Reserved 28
10. Model 2701 features six front panel LEDs that monitor connections on the G 703 G 704 and signaling error and test modes Figure 6 shows the front panel location of each LED Descriptions of each LED follow Figure 6 ma DE PATTON NetLink RS 530 G 703 G 704 NTU DE Tlecironics To gt e8 mon O O O O Zeg 0 A paa E1 Link TD RD LOS ER TM Remote 511 Figure 6 2701 Front Panel E1 Link Active Green Solid green On indicates that the end to end E1 Link is up signifying that the link is active The E1 Link LED is Off when the link is down TD 4 RD Glows yellow to indicate an idle condition of Binary 1 data on the respective terminal interface signals Green indicates Binary O data LOS The Loss of Sync LED lights when the unit loses synchroniza tion with the incoming signal This may happen when there is a framing mismatch or a loss of signal In unframed mode the LOS LED monitors the status of the transmit clock ER The error LED indicates various error conditions including fram ing bit errors excessive zeros controlled slips severe errors or bit errors when sending V 52 test patterns When sending a test pattern the LED will remain lit if the unit does not receive 17 the identical pattern When it receives the correct pattern the LED will turn off If error insertion is on the LED will blink once a second if everything is operating properly TM Active Yellow Solid Yel
11. ake these connections 4 1 CONNECTING TO THE G 703 NETWORK The Power G 703 G 704 and serial Line connections are located on the rear panel of the Model 2701 The following sections describe operation of these connections Connecting the 2701 D X 21 version Dual Coaxial Cable 75 ohm to the G 703 Network The Model 2701 D X 21 version is equipped with dual female BNCs TX and RX for connection to a 75 ohm dual coax G 703 network inter face If your G 703 G 704 network terminates via dual coaxial cable use the diagram below to make the proper connections See Figure 3 Data TO TX RX Data Network FROM Network Figure 3 Rear Panel Showing Location of Connectors Note The outer conductor of the coax cables are isolated from system earth ground When using the 75 Ohm interface jumper straps JP2 JP5 JP6 and JP7 must be installed over the jumpers The jumpers are located next to the BNC connectors Refer to the following section to open the case Open the case and install jumper straps for JP2 JP5 JP6 and JP7 Opening the Case Open the case by inserting a screwdriver into the slots and twist the screwdriver head slightly The top half of the case will separate from the lower half of the case Take caution not to damage any of the PC board mounted components Connecting the Twisted Pair 120 ohm to the G 703 Network The Model 2701 is equipped with a single RJ 48C jack for connections to a 120 ohm t
12. ay be done in two ways Activate the RL signal on the DTE 2701 B and 2701 C only If you are not sure which lead is the RL signal please refer to Appendix B or C depending on the version you are using L3 Set the front panel switch to Remote 2 Perform a bit error rate test BERT using the internal V 52 genera tor as described in section Using the V 52 BER Test Pattern Generator or using a separate BER Tester If the BER test indi cates a fault and the Local Line Loopback test was successful for both NetLink devices you may have a problem with the twisted pair line connection CSU Loop Although CSU Loop is predominantly a T1 function the NetLink 2701 responds to central office initiated loop commands Customers can use this facility when the Central Office network switch supports CSU loops over an El interface When CSU Loop is selected the NetLink 2701 will implement the loop up command when it recognizes the pattern 10000 in the data stream for a minimum of 5 seconds The loop down command is implemented by the pattern 100 in the data stream for a minimum of 5 seconds The NetLink 2701 will respond to Universal Loopback De activate to clear all central office loops Using the V 52 BER Test Pattern Generator To use the V 52 BER tests in conjunction with the Remote Digital Loop back tests or with Local Line Loopback tests follow these instructions 1
13. bility via hardware DIP switches This section describes all possible DIP switch configurations of the Model 2701 3 1 DIP SWITCH CONFIGURATION The Model 2701 has two sets of internal DIP switches that allow configu ration for a wide range of applications The sets of switches are accessed from the underside of the 2701 Figure 1 shows the location of the DIP switches on the bottom of the printed circuit board Figure 1 Underside of Model 2701 Showing Location of DIP Switches The Model 2701 DIP switches Switch Sets 1 2 can be configured as either ON or OFF Figure 2 shows the orientation of the DIP switches with respect to ON OFF positions ON Y OFF Figure 2 Close up of configuration switches mm m E EN mm WC mem mr mem on HG no mm E mem wo DHS 8 Switch SW1 1 through SW1 5 A detailed description of each switch SW1 1 through SW1 5 setting fol lows the summary table below Table 1 Switch Set 1 Summary Table Position Function Factory Default Selected Option SW1 1 DTE Rate OFF SW1 2 DTE Rate OFF SW1 3 DTE Rate OFF SW1 4 DTE Rate OFF SW1 5 DTE Rate OFF SW1 6 Clock Mode O Receive Recovered SW1 7 Clock Mode HE Receive Recovered SW1 8 TM from DTE OFF Enabled Use Switches SW1 5 to set the DTE data rate Of of On 2 048 Mbps Clear Channel n On On Of ol 160ks on On or Of ges n on on of of re Eon or Of ees
14. error rate test as described in section Using the V 52 BER Test Pattern Generator on page 20 If the BER test equipment indicates no faults but the data terminal indi cates a fault follow the manufacturer s checkout procedures for the data terminal Also check the interface cable between the terminal and the Model 2701 Operating Remote Digital Loopback RL The Remote Digital Loopback RL test checks the performance of both the local and remote NetLink E1 M as well as the communication link between them Any characters sent to the remote NetLink E1 M in this 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 termi nal screen after having been passed to the remote NetLink E1 M and looped back G 703 G 704 NTU G 703 G 704 NTU Model 2701 Serial Model 2701 Serial Receive Internal rial Clocking Seria Device Serial Device Clock Data Clock Data Figure 8 Remote Loop in a Network Extension Application There are two Remote Loops that can be initiated from the NetLink E1 unit 1 V 54 Loop and 2 CSU Loop The user can select the type of loop that can be initiated by Switch S2 4 When a loopback is initiated this is the type of loop that the unit uses to loop up the remote unit and which type of loop the unit will respond to To perform an RDL test follow these steps 1 Activate RDL This m
15. he front panel switches If set to CSU the Model 2701 will initiate a CSU loop when Remote Loop is selected by the front panel switches sr Rope O Initiate a V 54 RDL loop when selected Initiate a CSU loopback when selected Switch SW2 5 Front Panel Switches As the Front Panel Switches may be inadvertently toggled or in the event that the end user may not need to use the switches the installer may disable the front panel switches Set Switch S2 5 to determine whether the front panel toggle switches are active or inactive as omon Front Panel Switches Enabled Front Panel Switches Disabled Switch SW2 6 V 54 Response Disabled default V 54 Response is a special in band loopback facility that sends a pseudo random pattern over the data stream This is the only loopback that the unit can initiate This is useful for campus applications when you need to put a remote unit in loopback The unit responds to the V 54 loop back command and the whole process takes only a few seconds to com plete When V 54 Loopback is disabled the unit will not be able to send or respond to V 54 loopback commands The duration of the loopback is limited by the loopback timeout setting wzo opon V 54 Response Enabled V 54 Response Disabled 1 2 4 0 INSTALLATION Once the Model 2701 is properly configured it is ready to connect to the G 703 G 704 interface to the serial port and to the power source This section describes how to m
16. hnical Support at 301 975 1007 2 1 FEATURES e Terminates G 703 and G 704 E1 fractional E1 service Available in low cost standalone or rack mountable versions e nx 64 kbps data rates to 2 Mbps e X 21 V 35 and ElA 530 e Switch selectable AMI or HDB3 line encoding options e Switch selectable DTE DCE modes for X 21 version e 75 ohm dual coax and 120 ohm twisted pair G 703 connections e Local and remote loopback diagnostics Internal external and G 703 network timing e CE and BABT approvals e 100 240 VAC and 48 VDC power options e Conforms to ONP requirements CTR 12 and CTR 13 for connection to international Telecom networks 2 2 DESCRIPTION The Model 2701 receives channelized G 704 n x 64 kbps or clear chan nel E1 G 703 2 048 Mbps data from the Telco s digital data network The Model 2701 terminates the G 703 telco interface and converts the data for transmission to a user oriented serial X 21 V 35 and ElA 530 V 36 RS422 The 2701 can connect to a Router FRAD PABX or Multi plexer over ts serial interface at nx64kbps data rates up to 2 048 Mbps Thank you for your purchase of this Patton Electronics product This product has been thoroughly inspected and tested and is warranted for One Year parts and labor If any questions or problems arise during installation or use of this product contact Patton Electronics Technical Support at 301 975 1007 3 0 CONFIGURATION The Model 2701 features configuration capa
17. low indicates an Active Test Mode The unit may be placed in test mode by the local user or by the remote user 5 3 LOOP V 54 amp TELCO DIAGNOSTICS The Model 2701 offers three V 54 loop diagnostics Use these diagnos tics to test the NTU and any communication links These tests can be activated via the front panel switches or via signals on the Model 2701 B and C serial port interface Operating Local Loopback LL The Local Loopback LL test checks the operation of the local Model 2701 and is performed separately on each unit Any data sent to the local Model 2701 in this test mode will be echoed returned back to the user device e characters typed on the keyboard of a terminal will appear on the terminal screen G 703 G 704 NTU G 703 G 704 NTU Model 2701 Serial Model 2701 Serial Receive Recover Clocking Serial Device Internal Serial Clocking Device Model 2701 Serial Model 2701 Figure 7 Local Loopback for a Network Termination Application To perform a LL test follow these steps 1 Activate LL This may be done in one of two ways Place the switch on the front panel in the Local position Activate the LL signal on the DTE 2701 B and 2701 C only If you are not sure which lead is the LL signal please refer to Appendix D 18 2 Verify that the data terminal equipment is operating properly and can be used for a test 3 Perform a V 52 BER bit
18. on 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 Configuring the X 21 Interface 2701 D The serial port on the X 21 interface 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 top case Refer to section Opening the Case on page 13 The DCE DTE strap is located near the DB15 connector on the top side of the 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 configura tion of the X 21 port Note If the 2701 D is configured as a DTE the clocking mode must be set for external clock 4 3 POWER CONNECTION Universal AC Power 100 240 VAC The Model 2701 uses a 5VDC 2A universal input 100 240 VAC power supply center pin is 5V The universal input power supply has a male IEC 320 power entry connector This power supply connects to the Model 2701 by means of a barrel jack on the rear panel Many interna ti
19. onal power cords are available for the universal power supply The Model 2701 powers up as soon as it is plugged into an AC outlet there is no power switch 15 DC Power The 36 60 VDC DC to DC adapter supplied with the DC version of the Model 2701 plugs in a DC source nominal 48 VDC and plugs into the barrel power supply jack on the rear of the 2701 Refer to Figure 5 to make the proper connection To 48VDC Source To Power p ee Supply Jack Vin 66666 101 068 9Sv ZL N S 1a3uag WL AS indino n13s o u VEL 0 9GA09 9 Ndu Kiddns amod 9qA8t INSd A87 I9PON puejAley BingsJayjie9 E 00 SI9TUOLJD9 T TE INGLES NG Figure 5 Connecting DC Power to the 2701 DC Power Supply There are no user serviceable parts in the power supply section of the Model 2701 Con tact Patton Electronics Technical support at 301 975 1007 via our web site at http www patton com or by e mail at support pat WARNING ton com for more information LG 5 0 OPERATION When the Model 2701 has been properly configured and installed it should operate transparently This sections describes power up LED status monitors and the built in loopback test modes 5 1 POWER UP Before applying power to the Model 2701 please read Power Connec tion on page 15 and verify that the unit is properly connected to the appropriate power source 5 2 LED STATUS MONITORS The
20. ovider If you are using two Model 2701s together as short range modems set both units to HDB3 SW2 1 Line Encoding Options HDB3 AMI HDB3 In this line coding the transmitter substitutes a deliberate bipo lar violation when excessive zeros in the data stream are detected The receiver recognizes these special violations and decodes them as zeros This method enables the network to meet minimum pulse density requirements Unless AMI is required in your application HDB3 should be used whenever possible AMI Alternate Mark Inversion defines a pulse as a mark a binary one as opposed to a zero In an E1 network connection signals are transmitted as a sequence of ones and zeros Ones are sent as pulses and zeros are sent as spaces e no pulse 10 Every other pulse is inverted from the previous pulse in polarity so that the signal can be effectively transmitted This means however that a long sequence of zeros in the data stream will cause problems since the NTU receiving the signal relies on the signal to recover the 2 048 Mb s clock If you must use AMI you should ensure that the data terminal equipment connected to the unit provides a minimally accept able pulse density For this reason there are advantages to using HDB3 instead AMI coding does not inherently account for ones density To meet this requirement the user should ensure that the data inherently meets pulse density requirements Switch SW2 2
21. wisted pair G 703 G 704 network interface If your G 703 G 704 network terminates via RJ 48C use the connection diagram d Figure 4 following the pinout and signals chart below to connect the 120 ohm G 703 G 704 network channel RJ 45 Cable 8 Wire G 703 G 704 2701 NETWORK SIGNAL SIGNAL PIN RX TX RX D TX TX B RX TX 4 RX Shield 3 Shield Shield 6 Shield No Connection 8 No Connection No Connection 6 _ 6 TX 5 S TX ee No SE 3 1 RX Sec RX 1 Figure 4 G 703 G 704 170 ohm Connection 4 2 CONNECTING THE SERIAL PORT The Model 2701 B C D supports RS 530 V 35 X 21 serial port connec tions This section describes how to connect the serial ports to your ter minal equipment Connecting to a DTE Device The serial port on the 2701 B RS 530 version and 2701 C V 35 ver sion 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 D as a guide Connecting to a DCE Device If the Model 2701 serial interface is hard wired as a DCE all except the X 21 versi
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