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11

UTP AND THIN ETHERNET REPEATERS

Fig. 3-2. NIC Termination Enabled.

10. There can be no more than two connections in line in the network

without reclocking. This means that any point in the network must be
able to be connected to any other point in the network through a
maximum of two links (3 hubs). In most, but not all, cases
(depending on the configuration of the rest of the network) it is
permissible to have three connections in a line. If your network layout
requires more than two connections, call for technical support.

Up to 1,500 feet

single UTP

Repeater

Terminator

Terminator

Repeater

RG58 A/U Coax

RG58 A/U Coax

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Summary of Contents for LZ1500A-R3

Page 1: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 2000 Black Box Corporation All rights reserved ...

Page 2: ...rt 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com MAY 2000 LZ1500A R3 LZ1502A R3 LZ1503A R4 LZ1504A R3 Long Distance Repeaters UTP BNC UTP 2 BNC UTP BNC RJ 45 UTP 4 BNC AUI LD Repeater L D ...

Page 3: ......

Page 4: ...peration of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the C...

Page 5: ...7 El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso L...

Page 6: ...de existir una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de...

Page 7: ...tance Repeaters 12 4 1 The Tools and Parts You Need 12 4 2 About the Wiring Closet 13 4 3 UTP Phone Wire 13 4 4 Patch Cables 14 4 5 About Cable Connections and Lengths 14 4 6 Installation Steps 16 4 6 1 Equipment Protection 16 4 6 2 Prepare the Site Plan 17 4 6 3 Measure Phone Wire 18 4 6 4 Install UTP Repeaters and Attach Patch Cables 20 4 6 5 Install 10BASE2 Thin Coax and AUI Segments 23 5 Monit...

Page 8: ...4 BNC Thin Ethernet 4 RJ UTP port 1 AUI to indicate status Connectors LZ1500A R2 1 BNC female 1 RJ 12 female 1 5 pin DIN female for Power LZ1502A R2 2 BNC female 2 RJ 12 female 1 5 pin DIN female for Power LZ1503 R4 1 BNC female 1 RJ 12 female 1 RJ 45 1 5 pin DIN female for Power LZ1504A R2 4 BNC female 4 RJ 12 female 1 AUI 1 5 pin DIN female for Power Power 100 250 VAC autosensing wallmount power...

Page 9: ...ts of each kit are listed below LZ1500A R3 1 LZ1500A R2 Repeater 1 SP528A surge protector A mounting kit with Velcro strips for wall mounting and rubber feet for table mounting 100 250 VAC autosensing wallmount power supply 47 63 Hz 9 V at 1 Amp This user s manual LZ1502A R3 1 LZ1502A R2 Repeater 2 SP528A surge protectors A mounting kit with Velcro strips for wall mounting and rubber feet for tabl...

Page 10: ...able mounting 100 250 VAC autosensing wallmount power supply 47 63 Hz 9 V at 1 Amp This user s manual If you do not find all of these components in the box please call Black Box at 724 746 5500 2 3 Networking Terminology The world of computer networking is full of unique terminology You will come across some of that terminology in this manual If you are new to networking and do not understand a te...

Page 11: ...ally installed with gas discharge protection devices carbon blocks or no protection devices at all If cabling has protection DO NOT BYPASS these devices they will help protect both your equipment and all those who work with it If the cable run you will be using is not protected DO NOT continue with the installation STOP Install suitable protection devices before proceeding and be sure that the man...

Page 12: ...less This formula works for standard 24 gauge phone wire 5 Check that the wires are properly protected against hazardous voltages see Section 6 1 6 Make patch cables with RJ 11 plugs Wire the RJ 11 plugs using the two center pins 3 and 4 Connect them straight through pin 3 to 3 pin 4 to 4 do not reverse polarity 7 Plug in the power supply and attach it to the repeater The LEDs on the repeater will...

Page 13: ...nd only one additional terminator at the far end of the run If the terminator is not attached or there are two or more terminators in addition to the termination provided by the repeater that segment of the network will not operate properly Fig 3 1 10BASE2 Thin Ethernet Segment Must End at the Repeater Some Network Interface Cards NICs hubs and adapters have terminators built in that may be enable...

Page 14: ...e to be connected to any other point in the network through a maximum of two links 3 hubs In most but not all cases depending on the configuration of the rest of the network it is permissible to have three connections in a line If your network layout requires more than two connections call for technical support Up to 1 500 feet single UTP Repeater Terminator Terminator Repeater RG58 A U Coax RG58 ...

Page 15: ...hem with patch cables to the phone punch down block or patch panel 4 Interconnecting with 10BASE2 coax 10BASE T or AUI Ethernet segments as applicable 5 Starting the system 4 1 The Tools and Parts You Need Installing Repeaters is fast and simple but does require tools and parts you may not normally have around the office Before you begin installation be sure you have these tools and parts on hand ...

Page 16: ...nals to the repeater with short patch cables While the wiring closet may seem like an intimidating and confusing place installing and wiring a Repeater there will be surprisingly easy 4 3 UTP Phone Wire Repeaters are intended for use with 100 ohm unshielded twisted pair telephone wire UTP already installed in and between buildings Buildings individual floors and wings of a building are often inter...

Page 17: ...e making patch cords for connecting the repeaters directly to the punchdown blocks make sure the wire used is compatible with the punchdown block Most blocks do not work properly with stranded wires These cables will typically have a connector on only one end with the other end connected directly to the punchdown block NOTE Because standard telephone patch cords contain a crossover in their wiring...

Page 18: ...HERNET REPEATERS Fig 4 4 Connecting Multiple Links Building One Repeater Repeater Repeater Repeater Repeater Retiming Repeater Building Two Building Three Building Four Building Five Repeater to building 2 ThinNet Ports ...

Page 19: ... all If cabling has protection DO NOT BYPASS these devices they will help protect both your equipment and all those who work with it If the cable run you will be using is not protected DO NOT continue with the installation STOP Install suitable protection devices before proceeding and be sure that the manufacturer s instructions are followed fully including connecting the ground strap This protect...

Page 20: ...5 Prepare the Site Plan 3 Locate and identify each pair of wire that you will use for the long distance interconnection The wire pairs must run only between the two points to be connected The link will not connect if there is a bridge tap anywhere on the link Workstations Location Two Workstations Punch Down Block Workstations Location One Location One Location Three Punch Down Block Punch Down Bl...

Page 21: ... Multiply the resistance by 20 to find the length of the wire in feet For example 54 6 ohms would indicate a cable length of about 1100 feet 54 6 x 20 1092 This formula works for 24 gauge phone wire Refer to the chart below for maximum acceptable resistance values of other wire gauges Attach a label to each pair showing its length This will be useful later if there is a cable fault To Repeater To ...

Page 22: ...st be 100 ohm impedance unshielded twisted pair Telephone wire connected between two Repeaters may span up to 1 500 feet 457 2 m in length If a run is longer you must break it in the middle and add another repeater such as an LZ1502A between the two segments Fig 4 7 Measuring the Length of the Telephone Wire Connecting Two Repeaters Punch Down Block Short Pair Together Ohm Meter 54 6 Ohms Punch Do...

Page 23: ...peater All LEDs on the repeater alternate between red and green 3 Wire the RJ 11 jacks using the two center pins 3 and 4 Attaching patch cable wires to the phone block requires the use of a punchdown or impact tool The wires must be punched down on forked pins corresponding to the phone wire pairs used for each end of the long distance span Fig 4 8 Punching Down Wires Form a loop at the end of eac...

Page 24: ...ection The LEDs will continue to alternate until both ends of the link are powered up and connected together Once linked together the LED on one unit will light red and the LED on the other unit will light green If they do not latch please see Chapter 6 0 for help in diagnosing the problem Punch Down Block To UTP Port 8 7 6 5 4 3 2 1 Punch Down Block To UTP Port 8 7 6 5 4 3 2 1 ...

Page 25: ...ET REPEATERS Fig 4 10 LZ150xA Series Hub to Hub Connection Punch Down Block Existing Hub To Stations RJ11 Existing Phone Wire Punch Down Block Existing Hub To Stations RJ11 Building Location One Building Location Two BNC BNC ...

Page 26: ...nd LZ1508A with two four and eight BNC ports respectively Installation Steps 1 Connect 10BASE2 thin coax segments to the Repeater as if each port is a 50 ohm terminator 2 When a segment is properly attached and the far end of the segment is properly terminated the adjacent LED will cease alternating 3 Be sure to connect the shield of one only one of the segments to an earth ground Fig 4 11 The Seg...

Page 27: ...that can be enabled or disabled via jumpers Make sure that only the NIC at the end of the segment farthest from the Repeater has its termination enabled and that all the rest are disabled If an external terminator is used then all the cards should have their termination disabled Fig 4 12 NIC Terminated at the End of the Segment Up to 1 500 feet single UTP Repeater Terminator Terminator Repeater RG...

Page 28: ... Fig 4 13 Hub to Hub Connection With Termination Punch Down Block RJ11 Existing Phone Wire Punch Down Block RJ11 Building Location One Building Location Two BNC Existing Hub To Stations Terminator BNC Existing Hub To Stations Terminator ...

Page 29: ...ch to other media such as 10BASE T or fiber optic networks The red LED indicates that the port is disabled This will occur when there are errors on the link such as multiple collisions in a row The port will be re enabled automatically once the error is cleared The green LED indicates the level of network traffic As network traffic increases the LED s intensity and blink duration increase Fig 4 14...

Page 30: ...eater ports will turn on the same color LED The only effect is that the crossed link doesn t function The rest of the network will continue to operate but messages that must traverse the crossed link won t be received A short in a cable that is more than 100 feet from a repeater port will not be detected and that port will have its red LED on depending on how far the short is from the other repeat...

Page 31: ...ected but there is a break in the wire When the LEDs alternate the corresponding port is automatically disconnected from the network This enables the remaining portions of the network to keep functioning until the problem is corrected 5 2 Troubleshooting Symptom No LEDs are on and the network does not operate Cause The repeater is not powered Action Check that the external power supply is plugged ...

Page 32: ... using an ohmmeter The distance to the short in feet is approximately the resistance times 20 Note that more often than not the problem will be at a connection check connections first Symptom A single device in a coaxial run with all the other devices on the run working does not communicate Cause 1 The device is not connected to the coaxial leg Action 1 Verify that the coax loops into the device I...

Page 33: ...in patch cables are used Reconnect the units with unshielded twisted pair Cause 4 Voice rated not data rated protection devices have been used Action 4 Only data rated surge protection devices will work properly Voice rated devices typically load the lines preventing high speed data transmission Replace any voice grade surge protectors with data rated devices Cause 5 The distance of the run exceed...

Page 34: ...n of the net will operate very slowly but the rest of the equipment will be unaffected Do not use flat telephone cables for patch cables or any other network connection for two reasons 1 Some devices are quite sensitive to EMI and RFI noise If you use flat untwisted wire even short patch cables you may experience very poor performance 2 Flat telephone cables have their polarity reversed any device...

Page 35: ... lower bandwidth networks so those networks can pass data to each other Balun A device that connects a BALanced line to an UNbalanced line for example a twisted wire pair to coaxial cable A balanced line is one in which both wires are electrically equal In an unbalanced line such as coaxial cable one line the central conductor has different physical properties from the other the surrounding concen...

Page 36: ...bbreviated as Carrier Sense Multiple Access with Collision Detection CSMA CD Gateway A device or program that connects two LANs that use different protocols and translates between these protocols allowing devices on the two networks to communicate with each other Hub A device that extends the maximum physical length of a network by receiving and then retransmitting signals among network segments A...

Page 37: ...orks Node An addressable device on a network such as a printer fax modem or computer Ohm An electrical unit of measurement used to measure the resistance of a transmission medium to the flow of electrons a current through the medium Ohmmeter A device that measures the resistance of electrical current flowing through a wire Packet A group of bits including address data and control elements that are...

Page 38: ...terpreted by some unauthorized person Star Topology A centralized network with a hub concentrator or star controller in the center and all the nodes connected to it The hub controls access and transmission along all of the connecting lines Star networks are simple to control because all control takes place at one point 10BASE5 The original Ethernet medium an implementation of the Ethernet IEEE sta...

Page 39: ...twork is its road map and can show which devices can communicate directly and which cannot because they don t share a connection path Typical topologies used on local area networks are the bus star and ring Transceiver A device used to connect a network node to a network segment Transceivers are also known as MAUs Media Access Units Twisted Pair Twisted pair cable consists of two insulated strands...

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