SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM SEH-22 AND SEH-24 10BASE-T STACKABLE HUB USER’S GUIDE CABLETRON SYSTEMS, P. O.
SEH Book Page i Tuesday, March 19, 1996 4:12 PM NOTICE Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made. The hardware, firmware, or software described in this manual is subject to change without notice.
SEH Book Page ii Tuesday, March 19, 1996 4:12 PM NOTICE FCC NOTICE This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
SEH Book Page iii Tuesday, March 19, 1996 4:12 PM NOTICE CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT IMPORTANT: Before utilizing this product, carefully read this License Agreement. This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron software program (the “Program”) contained in this package. The Program may be contained in firmware, chips or other media.
SEH Book Page iv Tuesday, March 19, 1996 4:12 PM NOTICE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY 1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including Its documentation and media).
SEH Book Page v Tuesday, March 19, 1996 4:12 PM TABLE OF CONTENTS CHAPTER 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 USING THIS MANUAL ............................................................................ 1-1 GETTING HELP ...................................................................................... 1-2 SEH OVERVIEW ..................................................................................... 1-2 SEH FEATURES .....................................................................................
SEH Book Page vi Tuesday, March 19, 1996 4:12 PM CONTENTS CHAPTER 5 5.1 5.2 INSTALLATION CHECK-OUT .................................................................5-1 USING LANVIEW ....................................................................................5-2 APPENDIX A A.1 A.2 TROUBLESHOOTING EPIM INFORMATION EPIM SPECIFICATIONS ........................................................................ A-1 A.1.1 EPIM-T .........................................................................
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM CHAPTER 1 INTRODUCTION Welcome to the Cabletron Systems SEH-22 and SEH-24 10BASE-T Stackable Hubs User’s Guide. This manual provides installation instructions and reference information for the SEH-22 and SEH-24. 1.1 USING THIS MANUAL Read through this manual completely to familiarize yourself with its content and to gain an understanding of the features and capabilities of the SEH. A general working knowledge of Ethernet and IEEE 802.
SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM CHAPTER 1: INTRODUCTION 1.2 GETTING HELP If you need additional support related to the Cabletron Systems SEH, or if you have any questions, comments, or suggestions concerning this manual, contact Cabletron Systems Technical Support: By phone ..........................(603) 332-9400 Monday-Friday; 8am - 8pm Eastern Time By CompuServe ...............GO CTRON from any ! prompt By Internet mail ...............support@ctron.com By FTP .........................
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM SEH FEATURES Stack up to five SEH hubs using Cabletron Systems external HubSTACK Interconnect cables. Manage the stack by using the Cabletron Systems MicroMMAC or SEHI (Stackable Ethernet Hub with Intelligence). Up to four SEH hubs can be stacked with one intelligent hub. Stackable configurations make it possible to maintain only one IEEE repeater hop while providing up to 130 Ethernet ports. 1.
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM CHAPTER 1: INTRODUCTION 1.5 STACKABLE CAPABILITIES The SEH is a non-intelligent hub designed to be managed by a Cabletron Systems intelligent hub such as the SEHI or the MicroMMAC. Intelligent hubs serve as the logical “top” of the stack. They manage all SEH hubs in the stack, providing full packet and error statistics for the entire stack, individual device, or individual port.
SEH Book Page 5 Tuesday, March 19, 1996 4:12 PM OPTIONAL FEATURES Table 1-2 lists the board revision requirements for EPIMs used in the SEH-24. The board revision number is located on the EPIM’s printed circuit board directly after the part number as shown in Figure 1-2. Table 1-2.
SEH Book Page 6 Tuesday, March 19, 1996 4:12 PM CHAPTER 1: INTRODUCTION HubSTACK Interconnect Cables Use Cabletron HubSTACK Interconnect cables to stack hubs together. Table 1-3 lists the part number and application for each cable. Table 1-3. HubSTACK Interconnect Cables P/N Description Application 9380110 12" HubSTACK Interconnect Cable SEH to SEH connections. 9380111 18" HubSTACK Interconnect Cable SEHI or MicroMMAC to SEH connections.
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM CHAPTER 2 INSTALLATION REQUIREMENTS/SPECIFICATIONS This chapter describes network guidelines, power requirements, and operating specifications for the SEH. Be sure to read this chapter before you install the SEH. The network must meet the requirements and conditions specified in this chapter to obtain satisfactory performance from this equipment. Failure to follow these guidelines could result in poor network performance. 2.
SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS 2.1.2 10BASE-T UTP and STP Cable Specifications The devices and 10BASE-T Twisted Pair Segments connected to the SEH 10BASE-T Twisted Pair Network Ports and EPIM-T module must meet the IEEE 802.3 10BASE-T specifications shown below. Length The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices transmit over a 100 meter (328 foot) link using 22-24 AWG unshielded twisted pair wire.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM CABLE SPECIFICATIONS Delay The maximum propagation delay of a 10BASE-T link segment must not exceed 1000 ns. This 1000 ns maximum delay limits the maximum link segment length to no greater than 200 meters. Crosstalk Crosstalk is caused by signal coupling between the different cable pairs contained within a multi-pair cable bundle.
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS 2.2 NETWORK PORT SPECIFICATIONS The SEH-22 and SEH-24 network ports use shielded RJ45 connectors that support both STP and UTP cabling. Figure 2-1 shows the RJ45 pinouts. 12345678 5X 1. Receive + 2. Receive 3. Transmit + 4. Not Used 1X 3X 5. Not Used 6. Transmit 7. Not Used 8. Not Used 1490_3 Figure 2-1. RJ45 Network Ports 2.
SEH Book Page 5 Tuesday, March 19, 1996 4:12 PM OPERATING SPECIFICATIONS 2.4 OPERATING SPECIFICATIONS This section describes the operating specifications for the SEH. Cabletron Systems reserves the right to change these specifications at any time without notice. General Delay Times (Start of Packets): Twisted Pair to EPIM- A 1.10 µs Twisted Pair to Twisted Pair 1.00 µs EPIM-A to Twisted Pair 1.
SEH Book Page 6 Tuesday, March 19, 1996 4:12 PM CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS Fault Protection: Each segment disconnects itself from the other segments if 32 consecutive collisions occur, or if the collision detector of a segment is on for longer than approximately 110 µs. This fault protection resets automatically after one packet is transmitted or received onto the fault protected segment without causing a collision. Power Requirements The SEH uses a universal power supply.
SEH Book Page 7 Tuesday, March 19, 1996 4:12 PM OPERATING SPECIFICATIONS Safety This unit meets the safety requirements of UL1950 (without D3 deviations), CSA C22.2 No. 950, and EN60950. EMI This unit meets the EMI requirements of FCC Part 15 Class A, EN55022 Class A and VCCI Class I. EMC This unit meets the EMC requirements of EN 50082-1 including: IEC 801-2 (ESD) levels 1 through 4, IEC 801-3 (Radiated Susceptibility) levels 1 through 4, and IEC 801-4 (EFT/B) levels 1 through 4.
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM CHAPTER 3 INSTALLATION This chapter outlines the procedure for attaching the SEH to a network as either a stackable or standalone device. Ensure that the network meets the guidelines and requirements outlined in Chapter 2, Installation Requirements/Specifications, before installing the SEH. Failure to follow installation instructions may result in an electrical shock hazard. 3.1 UNPACKING THE SEH Unpack the SEH as follows: 1.
SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM CHAPTER 3: INSTALLATION 3.2.1 Tabletop or Shelf Installation The following subsection provides guidelines for installation on a tabletop or shelf. Guidelines for Tabletop and Shelf Installation Tabletop and shelf installations must be within reach of the network cabling and meet the requirements listed below: • A single phase 120 Vac, 15 A, grounded power receptacle must be located within seven feet of the location.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM INSTALLING THE SEH If the installation requires that the SEH be stacked, proceed to Section 3.2.5. Otherwise, continue by powering-up the SEH as described in Section 3.3. 3.2.2 Rackmount Installation Requirements To install the SEH in a 19-inch rack, Cabletron Systems offers an accessory kit that includes rack mount brackets, mounting screws, and a strain-relief bracket for cable management.
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM CHAPTER 3: INSTALLATION Rack Mounting Brackets (2) Strain Relief Bracket 1491_08 Figure 3-2. SEH Rack Mounting Hardware 3.2.3 Attaching the Strain Relief Bracket Attach the strain relief bracket to the front of the SEH as follows: 1. Locate the strain relief bracket and four 8-32 x 3/8" screws from the accessory kit (see Figure 3-2). Do not use screws other than those included with the SEH accessory kit.
SEH Book Page 5 Tuesday, March 19, 1996 4:12 PM INSTALLING THE SEH 3.2.4 Rack Mounting the SEH Refer to Figure 3-4 and perform these steps to install the SEH in a 19-inch rack. 1. Locate the four 8-32 x 1/4" screws and the two rackmount brackets in the accessory kit (see Figure 3-2). Do not use screws other than the four 8-32 x 1/4" screws included with the SEH accessory kit. Use of longer screws may damage the unit or cause electrical shock. 2.
SEH Book Page 6 Tuesday, March 19, 1996 4:12 PM CHAPTER 3: INSTALLATION 19-Inch Rack HubSTACK 10BASE-T HUB WITH LANVIEW® SEH-24 Screws (4) 1491 05 Figure 3-5. Installing the SEH in the Rack If the installation requires that the SEH is to be stacked, proceed to Section 3.2.5. Otherwise, continue by connecting power as described in Section 3.3. 3.2.5 Stacking the SEH The rear panel of the SEH has an SEH Interconnect Bus In Port (female connector) and an SEH Interconnect Bus Out Port (male connector).
SEH Book Page 7 Tuesday, March 19, 1996 4:12 PM INSTALLING THE SEH To stack SEHs, refer to Figure 3-6 and perform the following steps: 1. Attach one end of the SEH HubSTACK Interconnect cable to the bus port labeled “OUT” on the rear panel of the SEH. 2. Attach the other end of the SEH HubSTACK Interconnect cable to the bus port labeled “IN” on the rear panel of the SEH next in the stack. 3. Attach up to four SEH hubs in the stack repeating steps 1 and 2.
SEH Book Page 8 Tuesday, March 19, 1996 4:12 PM CHAPTER 3: INSTALLATION If one end of a HubSTACK Interconnect cable is disconnected without disconnecting the other end attached to the hub, ensure that you disconnect the cable from the “OUT” port as shown in Figure 3-7. This ensures that the HubSTACK Interconnect cable is terminated properly. Disconnect SEH and SEHI Interconnect Cables at the "OUT" Port.
SEH Book Page 9 Tuesday, March 19, 1996 4:12 PM CONNECTING THE SEH TO THE POWER SOURCE 3.3 CONNECTING THE SEH TO THE POWER SOURCE NOTE The SEH uses a universal power supply that operates between 100-125 VAC or 200-240 VAC at 50-60 Hz. Connect the SEH to the power source as follows: 1. Plug the power cord into the back panel of the SEH. 2. Plug the other end of the power cord into a grounded wall outlet. 3. Verify that the PWR LED is on; this indicates that the SEH is receiving power. 3.
SEH Book Page 10 Tuesday, March 19, 1996 4:12 PM CHAPTER 3: INSTALLATION 2. Slide the new EPIM into place, making sure that the connectors on the rear of the EPIM align correctly and firmly with the connector inside the SEH. Refer to Figure 3-8. 3. Install the mounting screw. EPIM-2 EPIM-1 LNK EPIM-T 1490_12 Figure 3-8.
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM CHAPTER 4 CONNECTING TO THE NETWORK This chapter outlines the procedure for connecting the SEH to a network. Ensure that the network meets the guidelines and requirements outlined in Chapter 2, Installation Requirements/Specifications, before installing the SEH. 4.1 CONNECTING THE SEH TO THE NETWORK The procedure for connecting network segments to the SEH varies depending on the media and ports being connected.
SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM CHAPTER 4: CONNECTING TO THE NETWORK Connect twisted pair segments to the SEH as follows: 1. Insert the RJ45 connector from each twisted pair segment into the desired network port on the SEH. See Figure 4-1. EPIM-2 LNK EPIM-T 12X 10X 8X 6X 4X 2X LNK EPIM-T 11X 9X 7X 5X 3X 1X EPIM-1 1490_13 Figure 4-1. SEH-24 Network Ports 2. Check that the applicable LNK LED for the port is on.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM CONNECTING THE SEH TO THE NETWORK 4.1.2 Connecting a UTP Segment to an EPIM-T Before connecting a segment to the EPIM-T, check each end of the segment to determine if the wires are crossed over for the proper connection. If the wires do not cross over, use the switch on the EPIM-T to internally cross over the RJ45 port. Refer to Figure 4-2 to properly set the EPIM-T crossover switch. Position X (crossed over) 1. RX+ 2. RX3. TX+ 4. NC 5. NC 6. TX7. NC 8.
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM CHAPTER 4: CONNECTING TO THE NETWORK c. Check the cable for continuity. d. Check that the twisted pair connection meets dB loss and cable specifications outlined in Chapter 2. e. Check that the crossover switch is in the correct position. If a link is not established, contact Cabletron Systems Technical Support. 4.1.
SEH Book Page 5 Tuesday, March 19, 1996 4:12 PM CONNECTING THE SEH TO THE NETWORK Caution: Do not touch the ends of the fiber optic strands, and do not let the ends come in contact with dust, dirt, or other contaminants. Contamination of the ends causes problems in data transmissions. If the ends become contaminated, clean them with alcohol using a soft, clean, lint free cloth. Connect a segment to an EPIM-F1, EPIM-F2, or EPIM-F3 as follows: 1.
SEH Book Page 6 Tuesday, March 19, 1996 4:12 PM CHAPTER 4: CONNECTING TO THE NETWORK F1/F2 ST Connectors F1/F2 SMA 906 Connectors w/ Half Alignment Sleeves SMA 905 Connectors F3 ST Connectors 1490_15 Figure 4-3. The EPIM-F1, EPIM-F2 and EPIM-F3 4.1.4 Connecting a Thin-Net Segment to an EPIM-C To connect a thin-net segment to an EPIM-C, refer to Figure 4-4 and perform the following steps: 1.
SEH Book Page 7 Tuesday, March 19, 1996 4:12 PM CONNECTING THE SEH TO THE NETWORK 3. If the Internal Termination switch is in the OFF position: a. Attach a BNC tee-connector to the BNC port on the module. b. Attach the thin-net segment to one of the female connectors on the tee-connector. NOTE Terminate each segment attached to the tee-connector. If a segment is not attached to one of the female connections on the tee-connector, place a terminator on that connection. c.
SEH Book Page 8 Tuesday, March 19, 1996 4:12 PM CHAPTER 4: CONNECTING TO THE NETWORK 4.1.5 Connecting an AUI Cable to an EPIM-A ! CAUTION Ensure that the Signal Quality Error (SQE or “heartbeat”) test function is disabled on the external transceiver connected to the SEH. The SEH will not operate and the network will be unusable if the transceiver has the SQE test function enabled. Refer to the applicable transceiver manual. Connect an EPIM-A to an external network segment as follows: 1.
SEH Book Page 9 Tuesday, March 19, 1996 4:12 PM CONNECTING THE SEH TO THE NETWORK 5. Check that the PWR LED on the EPIM-A is on. If the LED is off, contact Cabletron Systems Technical Support. 6. If the PWR LED is on with the AUI cable disconnected, continue with the following checks: a. Check the AUI connections for proper pinouts. The pinouts for the transceiver connection are listed in Chapter 2. b. Check the cable for continuity. c. Reconnect the AUI cable to the SEH and the device.
SEH Book Page 10 Tuesday, March 19, 1996 4:12 PM CHAPTER 4: CONNECTING TO THE NETWORK 2. Attach one end of an AUI cable, no longer than 50 meters in length, to the port on the EPIM-X (Figure 4-6) and the other end to the intended node. ON Position (Toward Back of EPIM) ON OFF OFF Position (Toward Front of EPIM) 1490_18 Figure 4-6. The EPIM-X 4.2 FINISHING THE INSTALLATION The SEH is now ready for operation.
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM CHAPTER 5 TROUBLESHOOTING This chapter contains instructions for using LANVIEW LEDs to troubleshoot physical layer network problems. 5.1 INSTALLATION CHECK-OUT After connecting the SEH to the network, verify that packets pass between all Ethernet devices connected to the SEH and any other devices connected to the network. If difficulty is encountered with any of the attached devices, check the link as follows: 1.
SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM CHAPTER 5: TROUBLESHOOTING 2. If the remote station is ready and the LNK LED is on, but no data passes through the port, one of two conditions may exist: • Network management has disabled the port. • The port is segmented either because the collision detector was on for more than 110 µs or the SEH detected more than 32 consecutive collisions on the attached segment.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM USING LANVIEW HubSTACK SEH-24 10BASE-T HUB WITH LANVIEW® 24X 24 22 20 18 16 14 12 10 8 PWR MGMT CLN 6 4 2 RCV LNK RCV LNK E2 E1 23 21 19 17 15 13 11 9 7 5 3 1 23X LED Name LED Color Definition PWR (Power) Off No power Green (Solid) Power Green (Flashing) SEH managed by an intelligent hub Off SEH not managed CLN (Collision) Red Collision RCV (Receive) Yellow (Flashing) SEH is receiving data MGMT (Management) Off LNK (Link) N
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM CHAPTER 5: TROUBLESHOOTING MGMT (Green Flashing) This LED flashes when an intelligent hub manages the SEH. If this LED does not flash, an intelligent hub is not managing the SEH. If an intelligent hub is connected to the SEH and the LED does not flash, inspect the HubSTACK Interconnect cables for proper connections. CLN (Red) This LED indicates that a collision has occurred on one of the ports.
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM APPENDIX A EPIM INFORMATION A.1 EPIM SPECIFICATIONS EPIMs enable the connection of the SEH to the main network using different media types. Cabletron Systems offers a variety of EPIMs. The following sections explain specifications for each EPIM. A.1.1 EPIM-T The EPIM-T is an RJ45 connector supporting UTP cabling. It has an internal Cabletron Systems TPT-T 10BASE-T Twisted Pair Transceiver.
SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM APPENDIX A: EPIM INFORMATION A.1.2 EPIM-F1 and EPIM-F2 The EPIM-F1 and EPIM-F2 shown in Figure A-2 support Multimode Fiber Optic cabling. Each EPIM has an internal Cabletron Systems FOT-F Fiber Optic Transceiver. The EPIM-F1 is equipped with SMA Connectors and the EPIM-F2 is equipped with ST Connectors. Specifications for the EPIMs are listed below. 1490_30 1490_31 Figure A-2.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM EPIM SPECIFICATIONS A.1.3 EPIM-F3 The EPIM-F3 shown in Figure A-3 supports Single Mode Fiber Optic cabling. It has an internal Cabletron Systems FOT-F Fiber Optic Transceiver and is equipped with ST Connectors. Specifications for the EPIM-F3 are listed on the following page. 1490_32 Figure A-3. EPIM-F3 Note: Transmitter Power decreases as temperatures rise and increases as temperatures fall.
SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM APPENDIX A: EPIM INFORMATION Maximum Sensitivity (-36.0) Receive Sensitivity Typical Sensitivity (-31.0) Minimum Sensitivity (-30.0) Minimum Receive Input (-9.72) Typical Receive Input (-7.5) Maximum Receive Input Power Maximum Receive Input (-6.99) Maximum Transmit Power (-12.0) Transmitter Power* (At 25°C into 8.3/125µm fiber) Typical Transmit Power (-15.5) Minimum Transmit Power (-21.
SEH Book Page 5 Tuesday, March 19, 1996 4:12 PM EPIM SPECIFICATIONS A.1.4 EPIM-C The EPIM-C supports thin-net coaxial cabling and is equipped with an internal Cabletron Systems TMS-3 Transceiver. Use the TERM switch on the front of the EPIM-C to set the internal 50 ohm terminator. This eliminates the need to connect the port to a tee-connector and terminator. Figure A-4 shows the settings for the terminator switch.
SEH Book Page 6 Tuesday, March 19, 1996 4:12 PM APPENDIX A: EPIM INFORMATION A.1.5 EPIM-A and EPIM-X (AUI Port) The EPIM-A is a DB15 female connector used to attach segments to an external transceiver. The EPIM-X is equipped with dual internal transceivers. It has a DB15 male connector used to attach segments to an AUI cable. Figure A-5 shows both modules. 1490_35 Figure A-5. The EPIM-A and EPIM-X DB15 Pinouts Pin 1 2 3 4 5 6 7 8 Logic Ref. Collision + Transmit + Logic Ref.
SEH Book Page 7 Tuesday, March 19, 1996 4:12 PM EPIM CABLE SPECIFICATIONS A.2 EPIM CABLE SPECIFICATIONS The following subsections provide cable specifications for the various EPIMs use in the SEH. A.2.1 Multimode Fiber Optic Cable Specifications Table A-1 shows Multimode Fiber Optic Cable specifications for the EPIM-F1 and EPIM-F2 modules. Table A-1. Multimode Fiber Optic Cable Specifications Cable Type Attenuation Maximum Cable Length 50/125 µm 13.0 dB or less 62.5/125 µm 16.
SEH Book Page 8 Tuesday, March 19, 1996 4:12 PM APPENDIX A: EPIM INFORMATION A.2.2 Single Mode Fiber Optic Cable Specifications Table A-2 shows Single Mode Fiber Optic Cable specifications for the EPIM-F3. Table A-2. Single Mode Fiber Optic Cable Specifications Cable Type Attenuation Maximum Cable Length 8/125-12/125 µm 10.0 dB or less The maximum allowable fiber optic cable length is 5 km (3.1 miles) with bridges at each segment end. However, IEEE 802.
SEH Book Page 9 Tuesday, March 19, 1996 4:12 PM EPIM CABLE SPECIFICATIONS A.2.3 Thin-Net Network Requirements for the EPIM-C When you connect a thin-net segment to the SEH (via an EPIM-C), your network must meet the following requirements: Cable Type Use 50 ohm RG-58A/U coaxial cable to make up a thin-net segment. Length The thin-net segment must be no longer than 185 meters. Terminators Connect a 50 ohm terminator to the far end of each thin-net segment.
SEH Book Page 10 Tuesday, March 19, 1996 4:12 PM APPENDIX A: EPIM INFORMATION A.2.4 AUI Cable Requirements for the EPIM-A and EPIM-X To connect an external network segment to the SEH (via an EPIM-A or EPIM-X), the AUI cable must meet the following requirements: AUI Cable The cable between the module and device must be IEEE 802.3 type cable. Length The AUI Cable must not exceed 50 meters in length. If 28 AWG thin office drop cable is used, the maximum length is 15.24 meters (50 feet).
SEH Book Page 1 Tuesday, March 19, 1996 4:12 PM INDEX C R Cable Specifications 2-1 UTP and STP 2-2 Connecting to the Network 4-1 Rack Mounting 3-5 accessory kit 1-6 S D Daughter Board 1-6 Daughter Board Upgrade Kit 1-6 E EMC Requirements 2-7 EMI Requirements 2-7 EPIM Installation 3-9 EPIM-A A-6 EPIM-C A-5 EPIM-F1 A-2 EPIM-F2 A-2 EPIM-F3 A-3 EPIMs 1-4 EPIM-T A-1 EPIM-X A-6 Safety Requirements 2-7 Slide switch A-1 SQE 2-4 Stacking the SEH 3-6 Strain Relief Bracket 3-4 T Technical Support 1-2 TERM swit
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM POWER SUPPLY CORD The mains cord used with this equipment must be a 2 conductor plus ground type with minimum 0.75 mm square conductors and must incorporate a standard IEC appliance coupler on one end and a mains plug on the other end which is suitable for the use and application of the product and that is approved for use in the country of application.
