USER MANUAL
Contents
1. SW1 6 Clock Mode Network Recieved Recovered Internal Cd Internal Network Recieved 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 Transmitter timing is derived from an internal clock source External Clock Transmitter timing is derived from DTE terminal tim ing Internal Clock SVV1 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 S1 8 Setting Off Response to DTE Loopback Request Enabled On Response to DTE Loopback Request Disabled SWITCH SET 2 SUMMARY TABLE Factory Default Selected Option SW2 1 Line Coding HDB3 SW2 2 CRC 4 multiframe Disabled 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 Provider If you are using two Model 2701s together as short range modems set both units to HDB3 SVV2 1 Line Encoding OFF HDB3 ON AMI OPTIONS HDB3 AMI HDB3 In this line coding the transmitter substitutes a deliberate bipolar violation when excessive zeros in the data stream are detected The receiver recognizes these special violations and decodes them as2. CO gt BR Aa ojlo NIN o oo Z O CI N cojoo RX Timing DCE A NC 7 N o 21 APPENDIX C PATTON ELECTRONICS MODEL 2701 INTERFACE PIN ASSIGNMENT V 35 Interface M 34F Female Connector DCE Configuration Pin Signal Bern dar denua SGND Signal Ground Ge ee A EA RTS Request to Send Die CTS Clear to Send E DSR Data Set Ready Faza e nimscndoi ese et CD Carrier Detect EN DTR Data Terminal Ready Ne LLB Local Line Loop Ne e icecceet cates TM Test Mode INU eet rt RDL Remote Digital Loop E TD Transmit Data E RD Receive Data Se TD Transmit Data B Mani idee RD Receive Data B Upean XTC External Transmit Clock Ve RC Receive Timing AIN E eee ee XTC External Transmit Clock X seit Arian RC Receive Timing Ne e ha TC Transmit Clock A Pa A E EEE TC Transmit Clock B 22 V 35 TO V 35 STRAIGHT V 35 TO V 35 CROSS OVER APPENDIX D THROUGH CABLE PIN OUT CABLE PIN OUT PATTON ELECTRONICS MODEL 2701 INTERFACE PIN ASSIGNMENT Pin Function Pin Function Pin B_ Signal Ground 8 Signal Ground B X 21 Interface DB 15 Female Connector Pin Signal IH dh Frame Ground Oo td eka bs T Transmit Data A Beton ack geet aa C Control A A it das R Receive Data A p TDA q ta Indication A R RD A Ol is E S Signal Element Timing A TD B ae e BT Byte Timing A RD B SETTET SGND Signal Ground lo i SCT
3. Data Clock Dat Data Model 2701 Model 2701 Serial 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 a Place the switch on the front panel in the Local position 15 Receive i Internal Ethern i Clocking Recover thernet Device Clocking Device Clock Cable Span SH Data Data Clock Data oe Model 2701 1 Model 270171 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 may be done in two ways refer to a and b on the following page 16 a 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 b Set the front panel switch to Remote 2 Perform a bit error rate test BERT using the internal V 52 generator as described in Section 5 3 4 or using a separate BER Tester If the BER test indicates a fault and the
4. OFF ON OFF OFF OFF 1920kbps ON OFF OFF OFF OFF 1984kbps OFF OFF OFF OFF OFF Clear Channel 2048kbps 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 Position Function Factory Default Selected Option SW1 1 DTE Rate OFF SYV1 2 DTE Rate OFF eee SW1 3 DTE Rate OFF par SW1 4 DTE Rate OFF ge SW1 5 DTE Rate OFF SW1 6 Clock Mode OFF Receive Recovered SW1 7 Clock Mode OFF Receive Recovered SW1 8 TM from DTE OFF Enabled Use Switches SW1 5 to set the DTE data rate SW1 SW2 SVV3 SW4 SW5 Speed ON ON ON ON ON 64kbps OFF ON ON ON ON 128kbps ON OFF ON ON ON 192kbps OFF OFF ON ON ON 256kbps ON ON OFF ON ON 320kbps OFF ON OFF ON ON 384kbps ON OFF OFF ON ON 448kbps OFF OFF OFF ON ON 512kbps ON ON ON OFF ON 576kbps OFF ON ON OFF ON 640kbps ON OFF ON OFF ON 704kbps OFF OFF ON OFF ON 768kbps ON ON OFF OFF ON 832kbps OFF ON OFF OFF ON 896kbps ON OFF OFF OFF ON 960kbps OFF OFF OFF OFF ON 1024kbps ON ON ON ON OFF 1088kbps OFF ON ON ON OFF 1152kbps ON OFF ON ON OFF 1216kbps OFF OFF ON ON OFF 1280kbps ON ON OFF ON OFF 1344kbps OFF ON OFF ON OFF 1408kbps ON OFF OFF ON OFF 1472kbps OFF OFF OFF ON OFF 1536kbps ON ON ON OFF OFF 1600kbps OFF ON ON OFF OFF 1664kbps 5 framing TSO is reserved for signaling
5. Services at tel 301 975 1007 email Support patton com or 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 arise concerning the installation or use of your Patton Model 2701 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 vvarrant 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 Terminates G 703 and G 704 E1 fractional E1 service e Available in low cost standalone or rack mountable versions e n x 64 kbps data rates to 2 Mbps e X 21 V 35 and EIA 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 e Internal and G 703 network timing e CE and BABT approvals e 90 260VAC amp 48VDC power options e Conforms to ONP requirements CTR 12 and CTR 13 for connec tion to international Telecom networks 2 2 DESCRIPTION The Model 2701 receives channelized G 704 n x 64kbps or clear channel E1 G 70
6. non condensing 0 to 70 C 9 0 x 5 3 x 2 0 cm 3 5 L x 2 1 W x 0 78 H 19 APPENDIX B PATTON ELECTRONICS MODEL 2701 INTERFACE PIN ASSIGNMENT EIA 530 Interface Pin Description DB 25 Female Connector DCE Configuration Pin Signal 1 FG Frame Ground 2 TD Transmit Data 3 RD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 SGND Signal Ground 8 CD Carrier Detect 9 RC Receive Timing B 10 CD Carrier Detect B 11 XTC External Transmit Clock 12 TC Transmit Clock B 13 CTS Clear to Send 14 TD Transmit Data B 15 TC Transmit Clock A 16 RD Receive Data 17 RC Receive Timing 18 LLB Local Line Loop 19 RTS Request to Send 20 DTR Data Terminal Ready 21 DL Remote Digital Loop 22 DSR Data Set Ready 23 DTR Data Terminal Ready 24 XTC External Transmit Clock 25 TM Test Mode 20 RS 530 TO RS 530 STRAIGHT THROUGH CABLE PIN OUT Z z Dv al slojolajolojsz Als oa Signal Ground C N N T N Ping Too 2 Boo a S 6 Zo 8 9 Ho I 2 KE 4 05 te RD B Timing DCE A ill 4 al UJ R N R N N N QO O JOJO N TX Timing DTE A gt X lt 5 NIN IN IN IN IN e gt KB U IN JO Z RS 530 TO RS 530 CROSS OVER CABLE PIN OUT Function 0 RIS O 1____ RX Timing DOE 8 a c NCS 4 be d 5 NO 6 Mme N gt IN
7. on the rear of the 2701 Please refer to Figure 5 below to make the proper connection To Power Supply Jack To 48VDC Source Vin Figure 5 Connecting DC Power to the 2701 DC Power Supply WARNING There are no user serviceable parts in the power supply section of the Model 2701 For more informa tion please contact Patton Electronics Technical support at 301 975 1007 via our web site at http www patton com or by e mail at support patton com 13 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 Section 4 3 and ensure that the unit is properly connected to the appropriate power source 5 2 LED STATUS MONITORS The Model 2701 features six front panel LEDs that monitor con nections on the G 703 G 704 and signaling error and test modes Figure 6 below shows the front panel location of each LED Descriptions of each LED follow Figure 6 kia i ai PA PRTTUR 0 gjbink R5 530 61056 704 NTU Megi Ei Lin T S La ce Lacal Hi 000606 COLO Qi 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 amp RD Glows yellow to i
8. will be echoed returned back to the user device i e characters typed on the keyboard of a ter b 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 2 Verify that the data terminal equipment is operating properly and can be used for a test 3 Perform a V 52 BER bit error rate test as described in Section 5 3 4 If the BER test equipment indicates no faults but the data terminal indicates a fault follow the manufactur er s checkout procedures for the data terminal Also check the interface cable between the terminal and the Model 2701 5 3 2 Operating Remote Digital Loopback RL The Remote Digital Loopback RL test checks the performance of both the local and remote NetLink E1 as well as the communication link between them Any characters sent to the remote NetLink E1 in this test mode will be returned back to the originating device i e char acters typed on the keyboard of the local terminal will appear on the local terminal screen after having been passed to the remote NetLink E1 and looped back G 703 G 704 NTU Model 2701 Serial G 703 G 704 NTU Model 2701 Serial minal will appear on the terminal screen G 703 G 704 NTU Model 2701 Serial G 703 G 704 NTU Model 2701 Serial i Receive Serial Serial Internal F Clockin Recover Device 9 Clocking Device Clock Cable Span a Data
9. 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 connec tion signals are transmitted as a sequence of ones and zeros Ones are sent as pulses and zeros are sent as spaces i e no pulse Every other pulse is inverted from the previous pulse in polarity so that the signal can be effectively transmit ted 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 7 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 require ments SWITCH SW2 2 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 f
10. 3 2 048 Mbps data from the telco s digital data net work The Model 2701 terminates the G 703 telco interface and con verts the data for transmission to a user oriented serial X 21 V 35 and EIA 530 V 36 RS422 The 2701 can connect to a Router FRAD PABX or Multiplexer over its serial interface at nx64kbps data rates up to 2 048 Mbps 3 0 CONFIGURATION The Model 2701 features configuration capability 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 configuration for a wide range of applications The sets of switches are accessed from the underside of the 2701 Figure 1 below 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 below shows the orientation of the DIP switches with respect to ON OFF positions Figure 2 Close up of configuration switches 4 ON N Omm m DHS 8 Fi A ON TT OFF Switch SW1 1 through SW1 5 A detailed description of each switch SW1 1 through SW1 5 setting follows the summary table below SWITCH SET 1 SUMMARY TABLE ON OFF ON OFF OFF 1728kbps OFF OFF ON OFF OFF 1792kbps ON ON OFF OFF OFF 1856kbps
11. E A fey sd e deed dy e i yv RTA Hoo R Receive Data B Nv SCTE B IO ea anon U Indication B IX JRTGB N SI Signal Element Timing B Y IN 1 N BT Byte Timing B 23 24 APPENDIX E PATTON MODEL 2701 FACTORY REPLACEMENT PARTS AND ACCESSORIES Patton Model Description PTO VBen G 703 G 704 NTU with RS 530 interface PROT Ces aut ethe G 7031G 704 NTU vvith a V 35 interface 270 AD vis nina G 7031G 704 NTU vvith an X 21 interface 210 UJ ud v dr s cote G 703 G 704 NTU w 10Base T EN interface O805US sianidi ratarea American Power Cord O805EUR snrnid European Power Cord CEE 7 O805UK innn United Kingdom Power Cord O805AUS eects Australia New Zealand Power Cord OS05DEN ves diskettes Denmark Power Cord QSOS F R ruista France Belgium Power Cord OSOBIN asistencia India Power Cord O805IS eee eeeeeeeeeeee Israel Power Cord O805JAP iisisti Japan Power Cord 0805SW initis naea Switzerland Power Cord OBO55D CU aaa Universal Input Povver Supply OJM2 ZON soi ves is avari User Manual 25
12. GNAL SIGNAL PIN RX 1 TX RX 2 TX TX Do RX TX 4 RX Shield 3 Shield Shield 6 Shield No Connection 8 No Connection 7 No Connection 6 pa 5 TX 4 No e 3 2 1 RX RX NMWRUIM NO Figure 4 G 703 G 704 170 Ohm Connection 11 4 2 Connecting the Serial Port The Model 2701 B C D supports RS 530 V 35 X 21 serial port connections This section describes how to connect the serial ports to your terminal equipment 4 2 1 Connecting to a DTE Device The serial port on the 2701 B RS 530 version and 2701 C V 35 version 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 pur chasing or constructing an interface cable please refer to the pin dia grams in Appendix D as a guide 4 2 2 Connecting to a DCE Device If the Model 2701 serial interface is hard wired as a DCE all except the X 21 version you must use a null modem cable when con necting to a modem multiplexer or other DCE device This cable should be of the shortest possible length we recommend 6 feet or less 4 2 3 Configuring the X 21 Interface 2701 D The serial port on the X 21 interface is default wired as a DCE but may be swit
13. Local Line Loopback test was successful for both NetLink s you may have a problem with the twisted pair line connection 5 3 3 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 E1 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 5 3 4 Using the V 52 BER Test Pattern Generator To use the V 52 BER tests in conjunction with the Remote Digital Loopback tests or with Local Line Loopback tests follow these instructions 1 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 will illuminate 2 If the above test indicates no errors are present move the V 52 toggle switch DOWN activating the 511 E test with errors pre sent If the test is working properly the local modem s red ER LED will blink once every seco
14. USER MANUAL MODEL 2701 B C D G 703 G 704 NTU with EIA 530 V 35 X 21 Interfaces Pa PATTON Nis PlectronicsTo Iso Part 07M2701 x A SALES OFFICE Docit 086101UA y Revised 02 08 00 301 975 1000 TECHNICAL SUPPORT 301 975 1007 http www patton com 1 0 WARRANTY INFORMATION Patton Electronics warrants all Model 270111 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 2701 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 inte
15. ched 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 4 1 2 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 configuration of the X 21 port NOTE If the 2701 D is configured as a DTE the clocking mode must be set for external clock 12 4 4 POVVER CONNECTION Universal AC Povver 100 240VAC The Model 2701 uses a 5VDC 2A universal input 100 240VAC power supply center pin is 5V The universal input power supply has a male IEC 320 power entry connector This power supply con nects to the Model 2701 by means of a barrel jack on the rear panel Many international 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 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 48VDC and plugs into the barrel power supply jack
16. etwork 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 net work interface If your G 703 G 704 network terminates via dual coaxial cable use the diagram below to make the proper connections See Figure 3 below Data TO T Data x RX Network r 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 JP3 JP6 JP7 and JP8 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 JP3 JP6 JP7 and JP8 4 1 2 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 10 4 1 3 Connecting the Twisted Pair 120 ohm to the G 703 Network The Model 2701 is equipped with a single RJ 48C jack for connec tions to a 120 ohm twisted pair G 703 G 704 network interface If your G 703 G 704 network terminates via RJ 48C use the connection dia gram 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 SI
17. nd A 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 17 NOTE The above V 52 BER tests can be used independent ly 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 18 APPENDIX A PATTON MODEL 2701 G 703 G 704 SPECIFICATIONS Network Data Rate Network Connector Nominal Impedance Line Coding Line Framing CRC 4 Multiframing Clocking Time Slot Rate Network Data Rates Distance Configuration Power Supply Humidity Temperature Dimensions 2 048 Mbps RJ 48C Dual Coax BNC 2701 D 75 120 ohm Selectable AMI or HDB3 G 703 Unframed or G 704 G 732 Framed Selectable On or Off Internal or Network Receive Recover 64 kbps 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 Maximum 1 8 km 6 000 ft on 24 AVVG Cable Two 8 Position DIP Switches 5VDC External power supply 100 240VAC 50 60Hz 0 4 Up to 90
18. ndicate an idle condition of Binary 1 data on the respective terminal interface sig nals Green indicates Binary 0 data LOS The Loss of Sync LED lights when the unit loses synchronization with the incoming signal This may happen when there is a framing mismatch or a loss of signal In unframed mode the LOS LED moni tors the status of the transmit clock ER The error LED indicates various error conditions including framing bit errors excessive zeros con trolled slips severe errors or bit errors when sending V 52 test patterns When sending a test 14 pattern the LED vvill remain lit if the unit does not receive the identical pattern When it receives the correct pattern the LED will turn off If error inser tion is on the LED will blink once a second if everything is operating properly TM Active Yellow Solid Yellow 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 diagnostics 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 5 3 1 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
19. oggled 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 SVV2 5 Option Off Front Panel Switches Enabled On Front Panel Switches Disabled SWITCH SW2 6 V 54 RESPONSE ENABLED DEFAULT V 54 Response is a special in band loopback facility that sends a pseu do 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 loopback command and the whole process takes only a few seconds to complete 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 SW2 6 Option Off V 54 Response Enabled On V 54 Response Disabled 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 make 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 4 1 1 Connecting the 2701 D X 21 version Dual Coaxial Cable 75 ohm to the G 703 N
20. or CRC 4 MF Otherwise the one using CRC 4 MF will detect loss of sync SVV2 2 Option Off CRC 4 Disabled On 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 inver sion is not necessary SW2 3 Option Off Data not inverted On Data inverted 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 the 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 8 S2 4 RDL Type Off Initiate a V 54 RDL loop when selected On Initiate a CSU loopback when selected SWITCH SW2 5 FRONT PANEL SWITCHES As the Front Panel Switches may be inadvertently t
21. rference to radio and tele vision reception The Model 2701 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 reasonable 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 2701 does cause interference to radio or television reception which can be deter mined 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 Certificate of Compliance is available by contacting Technical Support 1 3 SERVICE All warranty and nonwarranty repairs must be returned freight pre paid and insured to Patton Electronics All returns must have a Return Materials Authorization number on the outside of the shipping contain er This number may be obtained from Patton Electronics Technical
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