EOe-1 User Manual
Contents
1. BNC connectors or to 120 Ohm balanced unframed El via twisted pairs and a shielded RJ 48 connector The EOe 1 Ethernet Bridge uses HDLC encapsulation to transport Ethernet packets across the WAN and supports 10 100 auto negotiation or manual settings for 10M 100M Full or Half Duplex Ethernet The Ethernet port also supports a standard auto MDIX feature that will completely eliminate Ethernet cross over cables or the guessing that is sometimes involved in choosing a cable when connecting to a HUB or a PC The EOe 17 is very easy to configure by using simple DIP switch settings Both the El and Ethernet Bridge configuration settings require only two 8 pole DIP switches Once configured and set the EOe 7 requires no further adjustments To skip the rest of the product introduction for the EOe 1 please go directly to Chapter 2 Installation Chapter 1 Introduction 1 2 Technical Specifications E1 link Framing Unframed Bit Rate 2 048 Kbps Line Code AMI HDB3 Line Impedance 75 Ohms BNC coaxial 120 Ohms RJ 48 twisted pair Relative Receive Level 0 to 43dB Pulse Amplitude Nominal 2 37V 10 for 75 ohms Nominal 3 00V 10 for 120 ohms Zero Amplitude 0 1V Transmit Frequency Tracking Internal Timing 30 ppm Loopback Timing 50 ppm Jitter Performance According to ITU T G 823 Complies With ITU T G 703 Interface Connectors BNC unbalanced RJ 48 balanced Chapter 1 Introduction Ethernet Bridge Features m2. Use this method to quick test a standalone unit With the E1 timing source set to internal oscillator connect the E1 Tx to El Rx with a single coaxial cable Press the Pattern switch The El Tx and Rx circuits will be tested The E1 signal loss and alarm LEDs should be off and no test errors should result on the error LED Disconnect the Coax cable momentarily The signal loss alarm and error LEDs should all light Reconnect the cable and they should all go out This test may also be performed on the RJ 48 by making a loop back plug Pattern Depressed Coax Cable Figure 4 4 Standalone BERT Test 29 Chapter 4 Test amp Diagnostics Most Ethernet link problems occur when trying to connect to older legacy Ethernet equipment Unless it can be confirmed that the connecting equipment supports auto negotiation or what is sometimes referred to as n way connections it is recommended to disable the auto negotiation feature and manually set the speed and duplex settings Almost all old 10Base T equipment does not support Full Duplex Ethernet so it is quite safe to set all 10Base T equipment settings to Half Duplex A wrong setting will result in extremely poor performance on the LAN connection Here it should be noted that a good link indication does not necessarily mean the duplex setting is correct Additionally there is 100Base TX equipment which also does not support Full Duplex Ethernet Equipment may not link or the perf
3. 10BASE T 100BASE TX Full Duplex or Half Duplex m HP Auto MDI MDIX detects and corrects crossed cable m JEEE 802 3x flow control E Real time filtering with 256 address tables m Automatic address learning aging and deletion after 5 minutes m Up to 340 packet buffering capacity m Forwarding and filtering rate at WAN speed with throughput latency of 1 frame E Auto padding of undersized packets to meet the minimum Ethernet packet size requirement E Buffering modes can be selected according to the setting of WAN and LAN line speeds E Ethernet interface has automatic Twisted Pair polarity correction Specifications m LAN Standard Fully compliant with IEEE 802 3 802 3u Connector Shielded RJ 45 Speeds 10BASE T 100BASE TX Full or Half Duplex Frames Supports 64 to 1522 byte packet lengths standard and extended length frames for VLAN tagging etc m WAN Protocol Synchronous HDLC Data Rates 16K 32K 64K 128K 256K 512K 1024K or 2048Kbps DIP Switch selected Chapter 1 Introduction Diagnostics Test Switches Diagnostics Local loop back Remote loop back Test pattern generator LED indicators Power Green Power Signal Loss Red E1 link signal loss Alarm Red E1 link alarm includes BPV error All ones AIS Link Green Ethernet link is good TD Green Transmit data on Ethernet RD Green Receive data on Ethernet 100 Green Ethernet is 100Base Full Green Ethernet is Full Duplex Error Red Ethernet Bridge Error overflow Error R
4. EOe 17 is connected in a point to point application In this case one EOe 1 s timing should be set to Internal Oscillator while the other should be set to Recovery E1 EOe 1 EOe 1 LNA Ethemet Bridge Ethemet Bridge LANA Figure 1 3 LAN to LAN with EOe 17 Ethernet over E1 In the following application the EOe 1 is connected in an El network application In this case both EOe 1 s timing should be set to Recover their timing from the E1 network EOe 1 EOe 1 Ethernet Bridge Ethemet Bridge Figure 1 4 LAN to LAN with EOe 17 Ethernet over E1 11 Chapter 1 Introduction This page left blank intentionally 12 Chapter 2 Installation 2 1 General This chapter provides detailed instructions for mechanical installation of the EOe 1 Following the completion of installation please refer to Chapter 3 for operating information 2 2 Site Preparation Install the EOe 17 within reach of an easily accessible grounded AC outlet The outlet should be capable of furnishing 90 250VAC DC power capable units connect via terminal block connection Allow at least 10 cm 4 inch clearance at the rear of the EOe 1 for signal lines and interface cables 2 3 Mechanical Assembly The EOe 1 is designed for tabletop or bench installation and is delivered completely assembled No provisions are made for bolting the EOe 7 to the tabletop 2 4 Electrical Installation Power connection AC power is supplied to the EOe 7 through
5. a standard 3 prong IEC receptacle Refer to Figure 2 1 The EOe 7 should always be grounded through the protective earth lead of the power cable or via Frame Ground connection 13 Chapter 2 Installation The AC line fuse is located in an integral type fuse holder on the rear panel Make sure that only fuses of the required rating are used for replacement Do not use repaired fuses or short circuit the fuse holder The power cable must be disconnected before removing or replacing fuses Rear panel connectors The interface connectors located on the rear panel of the EOe 7 Refer to Figure 2 1 incorporate two BNC Coax and two RJ 45 connectors Appendix B provides detailed information on the interface connectors 100 240VAC ON OFF E1 120 Figure 2 1 EOe 1 rear panel AC amp DC 14 Chapter 2 Installation E1 Line BNC coax connectors The pin assignment for BNC connector is as follows Pin Tx Center Tx Sleeve Rx Center Rx Sleeve RJ 45 E1 Connector Function TTIP Transmit data out TRING Transmit data out RTIP Receive data in RRING Receive data in The pin assignment for the RJ 45 connector is as follows Pin N o fF RJ 45 Ethernet Connector Tx Tx Rx Rx Function TTIP Transmit data out TRING Transmit data out RTIP Receive data in RRING Receive data in MDI 15 Chapter 2 Installation 2 5 DIP Switches amp Jumper Set
6. to WAN 32 packets WAN to LAN 308 packets Reserved 70 ete Tig soa 1 Et Tx Timing nt Osc 0 Et Line Code HDBS 0 Reseved 0 Reseved 7 8 EtLine Impedance 78 0 o 1200hms Table A 2 DIP SW2 Memory Configuration and E1 Settings Note 1 0 is equal to a switch setting of OFF while 1 is equal to a switch setting of ON 32 Appendix B Interface Connections B 1 E1 Line Connectors BNC connector definition Designation Direction Function Description TTIP From EOe 1 Transmit data TRING lt Signal return RTIP To EOe 1 Receive data RRING o Signal return Table B 1 E1 BNC connector pin allocation RJ 45 connector definition Designation i Direction Function Description TTIP From EOe 1 Transmit data From EOe 1 Transmit data Frame ground To EOe 1 Receive data To EOe 1 Receive data Frame ground Table B 2 E1 RJ 45 connector pin allocation Frame Ground is connected by default To disable see special instructions on page 34 33 Appendix B Interface Connections B 2 E1 Line Frame Ground To disable Frame Ground Chassis connections from the El signal carrying lines remove the jumper on the JP1 header located close to the RJ 45 E1 connector Signal line frame ground should only be connected at one end of the E1 line to avoid ground loops and ground potential differences between the each end of the line
7. Chapter 4 Test amp Diagnostics In this example both units at the ends of the E1 link have their pattern generators enabled Pattern EOe 1 EOe 1 Pattern Depressed Figure 4 1 BERT operation 26 Chapter 4 Test amp Diagnostics 4 4 Local Loop Back This test is activated by depressing the Local Loopbk button This test checks the performance of the EOe 17 and the connections between them This test consists of looping the receive El signal back to the remote EOe 1 see Figure 4 2 Local Loopbk Depressed Ethernet Bridge CLK tC oara rove EOe 1 Figure 4 2 Local loop back 27 Chapter 4 Test amp Diagnostics 4 5 Remote Loop Back This test is activated by depressing the Remote Loopbk push button The test checks the performance both of the local and the remote EOe 7 units as well as their interconnecting lines The remote digital loop back test consists of providing a loop back at the remote EOe 17 see Figure 4 3 A system test may be performed by first depressing the remote loop back switch then depressing the pattern switch The test pattern will be generated sent out the E1 link and looped back by the remote unit If no errors are indicated by the error LED the link test has been successful Remote Loopbk Depressed CLK DATA XMTR b 3 g Ethernet Bridge Figure 4 3 Remote loop back 28 Chapter 4 Test amp Diagnostics Loop back test notes
8. Power ON e Signal Loss OFF e Alarm OFF e Link ON e TD ON OFF or Flashing e RD ON OFF or Flashing e 100 ON for 100Base TX e Full ON for Full Duplex Ethernet e Error OFF e Error OFF e Test OFF 23 Chapter 3 Operation Refer to Chapter 4 for the operation of the front panel push button switches Their usage is explained under the Loop Back Tests on page 25 The rest of this page was left blank intentionally 24 Chapter 4 Test amp Diagnostics 4 1 General This chapter contains procedures for performing system diagnostic tests 4 2 Loop Back Tests The loop back test buttons Local Loopbk and Remote Loopbk and the LED indicators built into the EOe 1 allow for rapid checking of the EOe 1 and the E1 line Before testing the operation of the data system equipment and their line circuits ensure that all units are turned on connected properly and are configured correctly 4 3 Bit Error Rate Tester When depressing the Pattern push button switch the Bit Error Rate Tester BERT can be activated in which the test pattern transmitted is received by another EOe 1 see Figure 4 1 When used opposite another EOe 17 with the Pattern push button switch depressed and transmitting the same pattern V 52 511 bit the complete link can be tested If errors are encountered the Error indicator LED will blink for intermittent errors or remain on continuously for continuous errors 25
9. USER MANUAL EOe 1 10 100Base Ethernet over G 703 Unframed E1 CTE crc union Technologies Co Ltd ISO 001 CTC Union Technologies Co Lid Far Eastern Vienna Building Neihu Technology Park 8F No 60 ZhouZi St Neihu Taipei 114 Taiwan EOe 1 Ethernet over El User Manual Version 1 0 October 2003 First Printing Version 1 01 October 2004 Second Printing This manual supports the following models EOe 1 Ethernet over El Specifications subject to change without notice Table of Contents Chapter 1 Introduction scssssssssssceeeee L WT Genetal 2 2555 25 ag soshey gt odgan E E EE EAA EEEE 1 1 2 Technical Specifications 21 2veceeseessetseene veces saveeen 2 1 3 El Signal Suc tite 42 5556 sa see deess tase e setae deudus ek 6 LA EOe 1 Capabilities ccccscetcecticngscscatceeiwises eeeneageniees 7 1 5 System Timing Considerations e eee eee seen eee 8 1 6 Functional Description cece cece eee ee eect ne ene ones 10 1 7 Typical System Applications cceece sees eee e eee 11 Chapter 2 Installation ccccssceees 13 Pe Generalsin Seal sht ts eee dts Stak acest te Bes 13 2 2 Site Preparations iss 42 evap vee ded bevdeviev ees eds cdecnnnecae L3 2 3 Mechanical Assembly cnnco92iiceihane ss eae ce adeses yea aoa oe sees 13 2 4 Electrical Installation y vewcicavecsvesveesexcceevedeosauseneveues 13 2 5 DIP Switches and Jumper Settings ccceccccrcrcc
10. c 16 2 6 Rack Mount Installation cece cece eee cence eee es 18 Chapter 3 Operation cccsccccccccscsseee 2L ST Genet al eenaa na ea es Ielvac tues yews vere Dr cncsteey 21 3 2 Controls and Indicators cece ec eee eee eee es 21 3 3 Operating Procedure 55223 wo evades ee eersiaseawa heads amp 23 Chapter 4 Test amp Diagnostics 25 4V General aa aeaea r E a EEA ENA EENE 25 42 Loop Back Tests 5 2 veiiivessiceciiesen ss aiedadeeeieragibens 25 4 3 Bit Error Rate Tester esineeseen a ia 25 4 4 Local Loop Back sssssssssesssssesssessrrrrreresrsrsssrrere 27 4 5 Remote Loop Back sccccsessesessrrrrerrrrrrrsesrrrrreree 28 Table of Contents Appendix A DIP SW Setting EOe 1 31 A 1 DIP SW1 Bridge Ethernet and WAN Speed 31 A 2 DIP SW2 Memory Config and E1 Settings 32 Appendix B Interface Connections 33 B 1 El Line Connectors esssseesssseeresssserresssee 33 B 2 El Line Frame Ground cccccccceseeseeseeeees 34 B 3 Ethernet RJ 45 Connector Technical Inquiry Form ii Chapter 1 Introduction 1 1 General Thank you for choosing the EOe 1 Ethernet Bridge over El The EOe 17 is a Channel Service Unit for unframed ITU T G 703 El that features a built in Ethernet bridge The CSU has a built in Network Terminating Unit NTU and may connect to either 75 Ohm unbalanced unframed E1 via coaxial cable and
11. ed Bit Errors received during BERT Test Test Red Loop back and or BERT Test active Physical Height 45 mm 1 3 4 Width 195 mm 7 11 16 Depth 248 mm 9 25 32 Weight 850 g 1lb 1402 Chapter 1 Introduction Power supply Voltage 90 250VAC universal AC model 18 72VDC universal DC model Frequency 47 to 63 Hz for AC Power consumption 10 Watts Fuse 0 5A slow blow for AC model no fuse in DC model Environment Temperature 0 50C 32 122F operation Humidity 0 to 90 non condensing Chapter 1 Introduction 1 3 E1 signal structure The El line operates at a nominal rate of 2 048Mbps The data transferred over the El line is transmitted transparently as a bit stream in Unframed E1 mode E1 line signal The basic E1 line signal is coded using the Alternate Mark Inversion AMI or HDB3 rule In the AMI format ones are alternately transmitted as positive and negative pulse whereas zeros are transmitted as a zero voltage level AMI is not used in most 2 048Mbps transmissions because synchronization loss occurs during long strings of data zeros In the HDB3 format a string of four consecutive zeros is replaced with a substitute string of pulses containing an intentional bipolar violation The HDB3 code substitutions provide high pulse density so that the receiving equipment is able to maintain synchronization with the received signal Chapter 1 Introduction 1 4 EOe 1 Capabilities E1 link l
12. imens AS o sree Frame GND jumper lt Figure B 1 Frame Ground Connection B 3 Ethernet RJ 45 Connector Note Ethernet does not use pins 4 5 7 8 34 Technical Inquiry Form CTC Union Technologies Inc Fax 886 2 27991355 Tel 886 2 26591021 Attn Customer Support Department E mail info ctcu com From Company Name Tel Fax E MODEL O EOe 1 E ACTIVITY As attached in DIP switch setting table next page E System Configuration Drawing E Question Technical Inquiry Form MODEL No O EOe 1 Please fill in the DIP switches configuration with v marks into the following table Send it to us by fax and we will reply to you immediately Your Setting CTC Suggestion ON OFF ON OFF E 3 Ji MAC address filtering 802 3x Flow Control Ethernet Auto negotiation 10M 100M Speed Half Full Duplex WAN Speed WAN Speed Memory Buffer Confiquration Memory Buffer Configuration E1 Tx Timing source E1 Line Code Reserved Reserved E1 Line Impedance E1 Line Impedance Please include any additional comments CTC Union Technologies Co Lid Far Eastern Vienna Building Neihu Technology Park 8F No 60 ZhouZi St Neihu Taipei Taiwan W LIION __ Phone 886 2 2659 1021 Fax 886 2 2799 1355 E mail info ctcu com http Awww ctcu com
13. ine coding The EOe 1 supports two E1 line codes AMI coding HDB3 coding E1 framing formats The EOe 17 supports only Unframed E1 format WAN data rates The EOe 1 supports WAN channel rates of 2 048M 1 024M 512K 256K 128K 64K 32K and 16Kbps and is hardwired to a synchronous Ethernet Bridge Chapter 1 Introduction 1 5 System Timing Considerations E1 link timing The EOe 7 E1 link receive path always operates on the receive clock The EOe 17 recovers the receive clock from the received El link data signal The source of the EOe 7 E1 link transmit clock can be selected by the user E1 Link Transmit Timing Settings e Recovery loop back timing The EOe 1 E1 link transmit clock is locked to the recovered receive clock This is usually the timing mode selected for network operation Clock Mode 0 Recovery Ethernet Bridge 10 100Base transceiver Figure 1 1 Recovery timing 8 Chapter 1 Introduction e Internal timing The EOe 1 El link transmit clock is derived from the internal clock oscillator This timing mode is necessary in point to point applications over leased line In this case one EOe 1 must use the internal oscillator while the other must operate from the recovered clock Clock Mode 1 Internal Ethernet Bridge 10 100Base transceiver Figure 1 2 Internal Timing Chapter 1 Introduction 1 6 Functional Description The EOe 1 is a single port access unit for U
14. loop received E1 data to its transmitter Remote Loopbk The remote loop back switch causes the remote EOe 7 to loop received E1 data to its transmitter Pattern The pattern switch causes the EOe 7 to send and receive a 511 test pattern If errors are encountered the Error LED indicator lights for each received error Table 3 2 LED indicators Power Green Power Signal Loss Red E1 link signal loss Alarm Red E1 link alarms BPV All ones AIS Link Green Ethernet link is good TD Green Transmit data on Ethernet RD Green Receive data on Ethernet 100 Green Ethernet is 100Base Full Green Ethernet is Full Duplex Error Red Ethernet Bridge Error overflow Error Red Bit Errors received during BERT test Test Red Loop back and or BERT test active 22 Chapter 3 Operation 3 3 Operating Procedure The EOe 1 requires no operator attention once installed except for occasional monitoring of the front panel indicators Intervention is only required when e The EOe 1 has to be adapted to new operational requirements e Diagnostic loops are required The EOe 7 is turned on when its AC power cord or central office DC power is connected to an AC power outlet or the DC input connections and the power switch is turned to the ON position The Power LED indicator will light indicating that the EOe 1 is on Verify the EOe 7 is in operation by checking that the front panel LED s match the following indicator conditions e
15. nframed El only The EOe 1 AC model has a universal auto switching power supply 90 250VAC while the DC model s internal DC DC module accepts DC voltages from 18 to 72 volts The EOe 1 WAN supports user selectable speeds which halves the main El rate of 2 048Mbps down to a minimum of 16Kbps The E1 line is fully compliant with the ITU T G 703 standard and has a receive sensitivity of up to 43 dB on twisted pair or coax cable This provides an approximate operating range up to 2km using 22AWG twisted pairs The EOe 7 also fully meets other El specifications including ITU T G 823 for jitter The EOe 1 is capable of performing local and remote loop back The operator at either end of the line may test both the EOe 1 and the line in the loop back mode The loop back is controlled by a manual push button switch A front panel switch generates an internal 511 bit pseudo random test pattern according to ITU T for direct end to end integrity testing The Err indicator flashes for each bit error detected The EOe 7 unit is built in a compact case that can be placed on desktops or shelves or installed by means of an appropriate adapter in a 19 rack please see Chapter 2 10 Chapter 1 Introduction 1 7 Typical System Applications General The EOe 17 is not capable of fractional E1 operation and should be used where only an unframed transparent 2 048Kbps transmission is available or required In the following application the
16. ormance could be poor if the Ethernet is improperly configured Auto MDIX may also cause some compatibility problems Some Ethernet chips will fall asleep or shutdown if they are expecting an MDI device to connect with a crossover cable If this problem should arise please try connecting the Ethernet with a crossover cable 30 Appendix A DIP SW Setting EOe 1 A 1 DIP SW1 Bridge Ethernet and WAN Speed Dip State Function Description Remarks _ O Disable fitering repeater mode Saeco Bridge mode 0 _ Disable 802 3x flow contro 0 _ Ethemet Auto Negotiation _ 0 Ethemet Full Duplex ignored in auto 0 100Base TX speed 6 7 8 WANSpecd o 0 0 WAN Speed 2048Kbps 1 0 WAN Speed 1024Kbps ofifo wasp 6 7 8 1 1 0 WAN Speed 256kbps ofo 1 WAN Speed 128Kbps 1 0 1 WAN Speed 64kbps o 1 1 WAN Speed 32kbps Table A 1 DIP SW1 Bridge Ethernet and WAN Speed Settings Note 1 0 is equal to a switch setting of OFF while 1 is equal to a switch setting of ON Note 2 When auto negotiation is enabled SW1 3 ON the settings of SW1 4 amp 5 are ignored 31 Appendix A DIP SW Setting EOe 1 A 2 DIP SW2 Memory Configuration and E1 Settings pIP_ State Function Description Remark 41 2 Memory Configuration Memory Buffer LAN to WAN 308 packets WAN to LAN 32 packets Memory Buffer LAN to WAN 170 packets WAN to LAN 170 packets Memory Buffer LAN
17. peater mode Note 2 When the Ethernet negotiation is set to auto the settings for speed and duplex are ignored For legacy equipment which does not support auto negotiation it is highly recommended to place SW1 3 in the ON position and manually set the speed 10 or 100 and duplex mode to match the connected Ethernet equipment Note 3 There is a 340 byte buffer that may be set in one of three operation modes equal division 170 bytes each between the LAN and WAN ports large portion 308 bytes allocated to the WAN port or large portion allocated to the LAN port When the WAN speed is set slow efficiency may be increased by allocating a larger buffer on the WAN side 17 Chapter 2 Installation 2 6 Rack Mount Installation All Standalone Rack Series units have the option of adding standard EIA 19 rack mount capability Two rack mount options provide for either mounting a single unit half space in a rack or for mounting two units in tandem full space In either situation one standard rack unit space is required Each rack mount kit provides all the necessary hardware for a complete installation Figure 2 2 Rack Mount Installation ETU01 SS In single unit installations the unit may be placed in the left or right side position simply by reversing the rack mounting brackets The kit includes one 1 short and one 1 long rack adapter four 4 3x8mm self tapping screws and four 4 12 24x0 5 screws 18 Chap
18. ter 2 Installation In order to save rack mount space units may be mounted in tandem Please refer to the following drawing examples for this application Figure 2 4 Tandem Units Mounting Detail The tandem kit includes two 2 rack mount brackets one 1 each of inner and outer central mounting brackets twenty 20 3x8mm self tapping screws and four 4 12 24x0 5 screws 19 Chapter 2 Installation This page left blank intentionally 20 Chapter 3 Operation 3 1 General This chapter describes the EOe 7 controls and indicators explains operating procedures and supplies instructions for field strapping changes Installation procedures in chapters 2 must be completed and checked before attempting to operate the EOe 1 3 2 Controls and Indicators All controls push button switches and LED indicators are located on the EOe 7 front panel Depress a push button to activate turn ON the corresponding control Release the push button to deactivate turn OFF the control The function of each push button and indicator is described in Table 3 1 and Table 3 2 EOe Local Remote Loopbk Loopbk Pattern o 4 s S P N OJ gt O FF ek EF eC EF ESR O thernet Test E1 E 4 2 d o g d 9 Lo 7y gt Figure 3 1 EOe 7 Front Panel 21 Chapter 3 Operation Table 3 1 Control Functions item Control Switch Local Loopbk The local loop back switch causes the local EOe 7 to
19. tings Caution To avoid accidental electric shock disconnect the EOe 1 power cord before opening the cover Access inside the equipment is only permitted by authorized and qualified service personnel Procedure a Turn power OFF Disconnect the power cord from the AC outlet Loosen the screws at the left right of the rear panel Remove the PCB Adjust the DIP switches and jumpers as required according to table 2 1 Appendix A describes the DIP switches function in detail Replace the PCB and tighten the screw 16 Chapter 2 Installation Table 2 1 tem Function Possible Settings SetPiace Factory Setting f Sets EtremetmAC tering On fterea oroft repeoter oswa repeater f2 Sets 8023x Flow contol on enabied or of sabled 3 _ Sets Auto negotiation a Sets Ethernet Full Half Duplex DIPSW1 4 s sets Etnemetspees fon 10m orortsaoom fopswis hon fe _ sets wan speed a6kops w 2o48xops pieswis s faossrops z _ Sets Memor confguraton DIPSW2 3 Sets E1 Line Coder DIPSW2 4 D 10 _ Reserved sw25 it Resewes Resev prswzs 11 sets E1 Line Termination On 75 Ohms or Off 120 Ohms DIPSW2 7 8 20 Ohms n ls ts E1 Transmit Timing On Internal or Off recovery n Note 1 When MAC filtering is disabled the Bridge becomes an Ethernet repeater Filtering enabled is the default mode for Bridging However the units are shipped with their configuration switch set for re
Download Pdf Manuals
Related Search