HP EtherTwist Hub and Hub Plus Installation and Reference Guide
Copyright Hewlett-Packard Company 1992. All rights reserved. Hewlett-Packard Company makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
HP 28684B Hub/12 HP 28688B Hub Plus HP 28699A Hub Plus/48 HP EtherTwist Hub and Hub Plus Installation and Reference Guide HP Part Number: 5090-2692 Printed in U.S.A.
What Is In This Guide This guide contains information to help you install, configure, and troubleshoot your HP 28684B EtherTwist Hub/12, HP 28688B EtherTwist Hub Plus, and HP 28699A EtherTwist Hub Plus/48. The guide is organized as follows: Chapter 1 provides a brief introduction to the hubs. It describes important product features, what you should have received with your hub, and an overview of how the hub works. Chapter 2 provides hub installation instructions.
Contents 1 2 Introducing the HP EtherTwist Hub/12, Hub Plus, and Hub Plus/48 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Included Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front of the Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back of the Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status LEDs . . . . . . . .
3 4 A 4 Operation Starting the Console Session . . . . . . . . . . . . . Console CommandsHP 28699A;console commands . HElp . . . . . . . . . . . . . . . . . . . . . . . HElp . . . . . . . . . . . . . . . . BAckup (HP 28688B and HP 28699A Only) . . COunters . . . . . . . . . . . . . . . . . . . . DIsconnect . . . . . . . . . . . . . . . . . . . IPconfig (HP 28688B and HP 28699A Only) . PAssword (HP 28688B and HP 28699A Only) . PIng (HP 28688B and HP 28699A Only) . . . POrt . . .
B C D Console Connector and Cable Pin-Outs . . . . . . . . . . . Pin-Out for Hub’s Console Port Connector . . . . . . . . RS-232-C “Crossover” Cable (for Terminal/PC with 25-Pin Connector) . . . . . . . . RS-232-C “Crossover” Cable (for Terminal/PC with 9-Pin Connector) . . . . . . . . RS-232-C Cable for HP 110 . . . . . . . . . . . . . . . . Null-Modem Adapter (use with a modem cable when connecting a terminal) . RS-232-C Modem Cable . . . . . . . . . . . . . . . . . . Console Port Loopback Connector .
E Backup Links (HP 28688B and HP 28699A Only) Description . . . . . . . . . . . . . . . . . . . . . . Limitations . . . . . . . . . . . . . . . . . . . . . . Additional Notes . . . . . . . . . . . . . . . . . . . Configuring a Backup Link . . . . . . . . . . . . . . Identifying the Backup Link . . . . . . . . . . . . . . Indications of Backup Link Activation . . . . . . . . Reactivating the Primary Link . . . . . . . . . . . . Sample Topologies . . . . . . . . . . . . . . . . . . .
1 Introducing the HP EtherTwist Hub/12, Hub Plus, and Hub Plus/48 The HP 28684B EtherTwist Hub/12, HP 28688B EtherTwist Hub Plus, and HP 28699A EtherTwist Hub Plus/48 are 10-Mbit/s multiport repeaters used to connect computers and other networked devices in an unshielded twisted-pair cable network. These hubs are compatible with the IEEE 802.3 Type 10Base-T standard. See the document HP EtherTwist Technical Reference Guide (part number 5091-3237E) for network configuration guidelines.
Features (continued) Compatibility with the IEEE 802.3 Type 10Base-T standard and support for both IEEE 802.3 and Ethernet protocols. A self-test for fault identification when the hubs are powered on or when they are reset from the console or from a network management station. LEDs on both the front and back panels for easy interpretation of the hub’s status. Automatic segmentation of ports that are experiencing network communication problems. This improves network integrity and aids in fault isolation.
Included Parts HP EtherTwist Hub/12 (28684-60011) HP EtherTwist Hub Plus (28688-60011) or HP EtherTwist Hub Plus/48 (28699-60001) Accessories kit for the Hub/12 and Hub Plus (5062-9312) or the Hub Plus/48 (5062-3397), including: – two mounting brackets for the Hub/12 and Hub Plus (5001-5624) or the Hub Plus/48 (5001-5641) – four 10-mm M4 screws (0515-0780) – four 5⁄8-in number 12-24 screws (2940-0238) – AUI retainer (5062-3351) – four self-adhesive rubber feet (0403-0427) – Velcro BNC “T” connector cover (1
Front of the Hub HE PA WLE CK TT AR D Fib Hu er-Op b PL tic US HE PA WLE CK TT AR D Hu Hu b/12 b Plus Status LEDs HP 28684B and HP 28688B Status LEDs HP 28699A Status LEDs ~Line On (green) is ON if the hub is receiving power. Activity (green) is ON when data is being transmitted. The frequency shows the amount of traffic. In heavy traffic, it may appear on all the time. Fault (yellow) is ON if the hub is faulty and needs to be replaced, FLASHING if a port has been auto-segmented.
Back of the Hub Dashed lines show top half of the Hub Plus/48 with additional twisted-pair port groups. Group selector button and LEDs Group B Group A Status LEDs ThinLAN port Console port Twisted-pair ports AUI port Group D Group C Station Address and Serial Number Status LEDs Power (green) is ON if the hub is receiving power. (This is the same as ~Line On on the front.) Activity (green) is ON when data is being transmitted. The frequency shows the amount of traffic.
Port LEDs (green), one for each network port, are ON when the corresponding port is enabled and functioning normally. Ports can be enabled and disabled using the Port command on the hub’s console. The AUI port LED is always ON when that port is enabled, even if it is not being used. For the twisted-pair ports the LED will be OFF if the link beat signal is not received from the device connected to that port.
Auto-Segmentation These hubs will automatically disable (auto-segment) a port if it experiences excessive collisions (greater than 30 consecutive collisions). The port will automatically return to operation if the excessive collision condition is removed and normal traffic is restored. Auto-segmentation can also be caused by improper termination of cabling attached to the AUI or ThinLAN ports, or by having nothing attached to the ThinLAN port when it is enabled.
Firmware Enhancements (HP 28688B and HP 28699A Only) Hewlett-Packard continually tests and improves its products. When firmware enhancements are made to the HP 28688B and HP 28699A hubs, you will be able to easily update them with the new code. The update can be made from a PC attached to the hub’s console port (directly or through a modem), or the hub’s new code can be downloaded over the network. The update procedures are described in documents that come with the new code.
Network Address. The communication between the hub and the network management station requires that the hub be assigned a network address. If you are using your hub in a Novell NetWare network, it can be automatically configured with an IPX address from an IPX router on the network. The hub is preconfigured to enable this function. Alternatively, if you are using the hub in a network that uses the Internet Protocol (IP), you manually configure the hub with an IP address using the hub console’s IP command.
Upgrading the HP 28684B to an HP 28688B To add network management capabilities, the HP 28684B EtherTwist Hub/12 can be upgraded to an HP 28688B EtherTwist Hub Plus. The upgrade procedure involves a software download to the HP 28684B Hub/12 using a unique password. The HP EtherTwist Hub/12 Upgrade Kit, HP part number J2351A, is available from your nearest Dealer or HP Sales Office. (One Upgrade Kit must be ordered for each HP 28684B Hub/12 to be upgraded.
2 Installation This chapter describes how to install and configure the HP 28684B EtherTwist Hub/12, HP 28688B Hub Plus, and HP 28699A Hub Plus/48, and verify that they are operating correctly. Installation Summary The steps to install the hubs are: 1. 2. 3. 4. Mount the hub (in a rack, on a wall, or on a table). Plug in the hub and verify its operation. Connect the hub to devices and networks.
1. Mount the hub 1. Make sure the hub’s power cord is correct for your country’s ac power supply. Do not plug the power cord into the power supply until the hub is mounted. (Note that the hub does not have a power switch; the hub is powered on when the power cord is plugged in.) 2. As described on the next page, mount the hub in a rack or on a wall by using the mounting brackets, or place it on a table. Before mounting the hub, plan its location and orientation relative to other devices and equipment.
Mounting the HP 28684B EtherTwist Hub/12 and HP 28688B Hub Plus For Rack or Cabinet Mounting: 1. Using a Phillips or cross-head screwdriver, attach the mounting brackets to the hub with 10-mm M4 screws (included in accessory kit). Note that the hub’s case and the mounting brackets are designed to allow you to rack mount the hub with either the back or the front facing out. 2. Position the hub in the rack or cabinet and slide it up or down until the rack holes line up with the bracket holes.
For Wall Mounting: Using a Phillips or cross-head screwdriver, attach the mounting brackets to the hub with 10-mm M4 screws (included in the accessories kit). Then attach the hub to a wood surface (minimum 1⁄2-inch plywood or equivalent) with 5⁄8-inch number 12 wood screws or equivalent (not included). Mounting bracket 10-mm M4 screws Flat on wall Mounting bracket Straight out from wall 10-mm M4 screws For Table Mounting: Attach the self-adhesive rubber feet to the bottom of the hub.
Mounting the HP 28699A Hub Plus/48 For Rack or Cabinet Mounting: 1. Using a Phillips (cross-head) screwdriver, attach the mounting brackets to the hub with 10-mm M4 screws (included in accessory kit). 2. Position the hub in the rack or cabinet and slide it up or down until the rack holes line up with the bracket holes. Then attach the hub to the rack with 5⁄8-inch number 12-24 screws (included in accessory kit).
For Wall Mounting: Using a Phillips (cross-head) screwdriver, attach the mounting brackets to the hub with 10-mm M4 screws, included in the accessories kit with the hub. Then attach the hub to a wood surface (minimum 1⁄2-inch plywood or equivalent) with 5⁄8-inch number 12 wood screws or equivalent (not included). Mounting bracket Flat on wall 10-mm M4 screws Straight out from wall For Table Mounting: Attach the self-adhesive rubber feet to the four corners of the bottom of the hub.
2. Plug in the hub and verify its operation 1. Plug the power cord into the hub’s power socket and into an ac power source. Note that the hub does not have a power switch; the hub is powered on when the power cord is plugged in. The HP EtherTwist hubs have a power supply that automatically adjusts to any ac power source that provides between 90 and 240 volts. No voltage range setting is necessary. 2. Check the LEDs on the hub’s back panel.
3. Connect the hub to devices and networks Use the network ports (twisted-pair, AUI, and ThinLAN) to connect to computers, other hubs or other network devices, or to a network backbone. Some examples follow showing how to connect devices and networks to the hub’s network ports. Details of how to connect your network cabling to the hub’s ports are included later in this chapter.
Connecting Other Hubs You can connect the hub to another HP EtherTwist twisted-pair hub using any of the network ports. Some examples are shown below. Note that twisted-pair cabling may pass through intermediate cross-connect blocks. See the HP EtherTwist Technical Reference Guide (part number 5091-3237E) for information on network topologies.
Port Connections Caution Do not touch the connector pins of connectors or cables. Static discharge may damage equipment. Twisted-Pair Port Using a 12-port modular adapter: (One modular adapter is included with the HP 28684B and HP 28688B. You can order additional modular adapters, product number HP 28638A.) Screws 1. Remove the Velcro strap holder by unscrewing and removing the two screws that hold it to the back of the hub. Velcro strap and holder 2.
Using a right-angle 50-pin connector: 1. Loosen the Velcro strap to make room for the 50-pin connector. 50-pin connector Twisted-pair port 2. Slip the connector inside the strap and plug it into the twisted-pair port. 3. Pull down on the Velcro strap end to tighten it, then pull up and secure the end to the strap.
ThinLAN Port 1. Attach a thin LAN cable section to one side of a BNC “T” connector. 2. Attach another thin LAN cable section or a 50-ohm terminator to the other side of the “T” connector. 3. Attach the “T” connector to the ThinLAN port. Thin LAN cable Thin LAN cable Thin LAN cable BNC “T” mid-cable attachment ThinLAN port on hub BNC “T” 50-ohm terminator end-of-cable attachment OR ThinLAN port on hub 4.
AUI Port Caution Do not touch the hub connector pins or the cable connector pins. Static discharge may damage the equipment. 1. Disable the SQE Test (signal quality error, or “heartbeat”, test signal) and Loopback Test options, if present on the transceiver. See Note below. AUI retainer AUI port on hub 2. Slide the AUI retainer (included) onto the connector posts on the transceiver or AUI cable. 3. Plug the transceiver or AUI cable into the AUI port on the hub and secure it with the retainer’s screws.
4. Customize the hub’s configuration (if needed) No changes to the hub’s default configuration are required for the hub to operate correctly. The hubs each have a console interface for customizing the hub’s configuration, monitoring its activity, and running diagnostics. To configure the hub, first connect a terminal or PC running a terminal emulator, as described under “Console Connection” below. Then, use the console interface to change the desired hub configuration parameters.
Connecting a Modem and Terminal 1. Use a full-duplex, asynchronous (character-mode) modem only. The following modems have been tested at their rated speeds: – HP 37212B Support Link – HP 35031A Support Link II – HP 50759A Support Link – Hayes 1200 Smartmodem – Racal Vadic Maxell 2400VP (Hayes 2400 compatible) – Black Box V.32 9600 Baud. 2. Configure the modem as described in appendix C, “Modem Configuration”. 3. Connect the modem to the console port using an RS-232-C modem cable.
If You Have Trouble with a Terminal or Modem Connection If you have connected a terminal or modem according to the previous instructions and you do not get a prompt after you have pressed RETURN several times, then try the following procedures in sequence until you get the prompt: 1. Connection Reset Procedure: a. Detach, then reattach the console or modem cable from the hub. b. Press RETURN several times for the prompt. 2. Cycle Power Procedure: a.
Configuration Commands Several of the console commands allow you to customize the operation of your hub. They are listed and described here. Command Name Command Function Factory Preset Value Backup (HP 28688B and HP 28699A only) Configures one of the hub’s ports for dedicated use in a backup (redundant) link to another hub. IPconfig (HP 28688B and HP 28699A only) Configures the hub to enable communication IP communications with a network management station using disabled. the Internet Protocol (IP).
3 Operation The HP 28684B EtherTwist Hub/12, HP 28688B Hub Plus, and HP 28699A Hub Plus/48 are designed to operate unattended. A console interface is provided with these hubs if you wish to customize their configuration, monitor their activity, or run diagnostics. (For the HP 28688B and HP 28699A, you can also perform these and other functions with the HP network management products from a network management station anywhere on the network.
Console Commands HP 28699A; console commands Enter at least the first two letters of a command to execute it, such as HE for the Help command. The Help command displays a screen like the following, listing all commands. Note that the BAckup, IPconfig, PAssword, and PIng commands are not displayed for the HP 28684B Hub/12. The commands and their uses are described in the rest of the chapter. HElp To see a list and brief description of all available commands.
BAckup (HP 28688B and HP 28699A Only) To configure one of the hub’s ports for dedicated use in a backup (redundant) link to another hub. The HP EtherTwist Hub Plus and Hub Plus/48 allow you to use any two of their network ports for a link to another hub in your network. The backup link normally carries no traffic, but it is automatically activated if the primary link fails. Note that any of the ports can be the backup port to any other port.
COunters To display counters for each port, the global count for all ports, and the time elapsed since they were last reset with the Reset command. Total Packets The total number of packets and fragments received. Collisions The number of times the port was involved in a collision. A single collision will be counted by all ports involved, so the total collision count may be less than the sum of the port counts. CRC Errors The number of packets with invalid Cyclic Redundancy Checksums (CRCs).
IPconfig (HP 28688B and HP 28699A Only) To set IP configuration parameters on the hub. Use this command if you wish the hub to be accessible using IP (the Internet Protocol). If either of the following is true, you must set the IP configuration parameters on the hub: The hub will be managed remotely with a network management product, such as HP OpenView Hub Manager or HP OpenView Interconnect Manager, over an IP network (a network operating system that uses IP communications).
IP Address The IP address of the hub, written in the format X.X.X.X. Each number between the decimal points is a decimal number between 0 and 255. Every IP address on a network must be unique. The default is 0.0.0.0, which disables IP communications on the hub. Subnet Mask The bit mask defining which portion of the IP address is the subnet address, written in the format X.X.X.X. A default value is automatically generated and depends on the class of IP address that has been entered.
LInkbeat To enable (set to ON) or disable (set to OFF) link beat on a port. The default setting is enabled (ON). Disable link beat on any twisted-pair port that is not connected to a Type 10Base-T device. Unused twisted-pair ports should have link beat enabled.
POrt To enable (set to ON) or disable (set to OFF) a hub port. The initial setting for all ports is enabled (ON). To simplify network changes, unused ports need not be disabled. You can use the Status command to check all the ports.
STatus To display status information for the hub, including the time elapsed since the last reset (see the Reset command), the hub’s station address, the Thinwatch setting, and a table with the following port information: For the Hub/12 and Hub Plus, do not specify a port group. For the Hub Plus/48, the parameter is a letter A, B, C, or D. If no port group is specified, all ports will be displayed. Port The port ID.
TEstlink To run a test of the link between the hub and another IEEE 802.3 device. Note The destination device must be able to send an IEEE 802.2 Test response packet upon receipt of an IEEE 802.2 Test command packet. You will be prompted for the 12-digit hexadecimal station address (also called MAC address, Ethernet address, or physical address) of the destination device. You will then be prompted for the number of test packets to send.
4 Troubleshooting Some of the hub console commands are used for the troubleshooting instructions in this chapter. See “Console Connection” in chapter 2 for details on connecting to the console port. See chapter 3, “Operation”, for details on the console commands.
Basic Troubleshooting Tips (continued) If the ThinLAN port is not being used, make sure that Thinwatch is disabled. (If Thinwatch is enabled on an unused ThinLAN port, the hub will operate but the Fault LED will flash.) Use the console’s Thinwatch command. Make sure link beat is set correctly on each twisted-pair port. See “Link Beat” in chapter 1.
Diagnosing With the LEDs LED patterns indicating problems Power Collision OFF Diagnostic Tips Fault Port * * Check power cord and power source. If OK, replace the hub. * Very frequent collisions could indicate a network fault or a cable not properly terminated, or SQE test not disabled. If link beat is not enabled on unused twisted-pair ports, crosstalk may be causing the problem. * A hub hardware failure was detected during self-test. Replace the hub.
Diagnostic Tests Testing the Hub Only Choose one of the following procedures to test the hub’s internal circuitry. The first is the most complete internal test. (The hub’s ports are not tested with the following procedures; see the next page to test the ports.) Cycle power on the hub by unplugging the power cord and then plugging it in. This causes the hub to test itself. All LEDs should go ON momentarily before returning to their operational states.
Testing the Hub’s Ports and the Links To test the hub’s ports and the attached network links, choose one of the following ways to run a test between the hub and an addressable device connected at the remote end of each of the cables you wish to test: Use the console’s Testlink command to run a link test. This works with devices able to send an IEEE 802.2 Test response packet upon receipt of a Test command packet. You specify the remote device by its 12-digit hexadecimal station address.
A Cables and Connectors This appendix lists cables that have been tested and verified for use with the HP EtherTwist Hubs. It also includes minimum pin-out information so, if you wish to use an unlisted cable, you can verify that the cables used in your installation are correctly wired. Note that each pin-out does not necessarily match the pin-out for the corresponding HP cable, but cables manufactured to follow the minimum pin-out will function correctly.
HP Cables Cable Function Cable Type Port Type on Terminal, PC, or Modem HP Product Number Connecting to the network: Connecting hub-to-hub Twisted-pair “crossover” cable — 92214W (6-inch Crossover Cable) Connecting hub-to computer Unshielded twisted-pair cable — 92268A, B, C, D, or N (4-pair) 92214R, S, or T (25-pair) — 92214U (0.
Other Standard Cables Cable Function Port Type on Terminal, PC, or Modem Standard Cable or Cable Solution Connecting to the console port: Attach a null modem adapter† (Tandy Null Modem Adapter No. 26-1496 has been tested) to the console 25-pin female port. Then attach a straight-through modem cable to the null modem adapter. Connect a terminal or PC to the console port with an RS-232-C cable.
Twisted-Pair Cable/Connector Pin-Outs Twisted-Pair Cable for Hub-to-Computer Connection To connect PCs or other network devices to the hub, use a “straight-through” cable. The twisted-pair wires must be twisted through the entire length of the cable. The wiring sequence must conform to AT&T 258A (not USOC). See “Twisted-Pair Cable Pin Assignments” later in this chapter for a listing of the signals used on each pin.
Twisted-Pair “Crossover” Cable for Hub-to-Hub Connection For wiring between two hubs, the transmit and receive pairs must be reversed. The twisted-pair wires must be twisted through the entire length of the cable. See “Twisted-Pair Cable Pin Assignments” later in this chapter for a listing of the signals used on each pin.
Twisted-Pair Cable Pin Assignments Twisted-Pair Straight-Through Cable Computer or Transceiver End Hub End Signal Pins Pins 1 2 3 6 1 2 3 6 (receive +) (receive –) (transmit +) (transmit –) Signal (transmit +) (transmit –) (receive +) (receive –) Twisted-Pair Crossover Cable Hub 1-end Signal (receive +) (receive –) (transmit +) (transmit –) Hub 2-end Pins Pins 1 2 3 6 6 3 2 1 Signal (transmit –) (transmit +) (receive –) (receive +) Thin LAN Cable Requirements The thin coaxial cables used with
AUI Cable Minimum Pin-Out Transceiver end 15-pin female Hub end 15-pin male 2 3 4 5 6 9 10 12 13 2 3 4 5 6 9 10 12 13 Signal Control In circuit A Data Out circuit A Data In circuit Shield (common drain) Data In circuit A Voltage Common Control In circuit B Data Out circuit B Data In circuit B Voltage Plus For this connection, you can use: HP 92264D (1-meter thin AUI extension, pin 4 not connected) HP 92254A through H (6-meter through 48-meter thick AUI cables) HP 92254J (5-meter thin AUI cable, pin 4 n
Console Connector and Cable Pin-Outs The HP EtherTwist Hubs have a console port that automatically detects whether a terminal or a modem is connected. No switch setting is required. Because of this function, a standard “straight-through” cable can not be used when connecting a terminal directly. For a terminal connection, you use a “crossover” cable (essentially a cable for connecting a printer to a serial port), or a modem cable with a null modem adapter attached (which provides the crossover function).
RS-232-C “Crossover” Cable (for Terminal/PC with 25-Pin Connector) Minimum Pin-Out Terminal/PC end 25-pin male Tx Rx GND 2 3 7 Hub end 25-pin male 2 3 7 5 6 8 22 23 Tx Rx GND CTS DSR DCD RI DRS RS-232-C “Crossover” Cable (for Terminal/PC with 9-Pin Connector) Minimum Pin-Out Terminal/PC end 9-pin female Tx Rx GND 2 3 5 Hub end 25-pin male 2 3 7 5 6 8 22 23 Tx Rx GND CTS DSR DCD RI DRS Cables and Connectors A-9
RS-232-C Cable for HP 110 Minimum Pin-Out HP110 end 9-pin male Tx Rx GND 2 3 7 Hub end 25-pin male 2 3 7 5 6 8 22 23 Tx Rx GND CTS DSR DCD RI DRS Null-Modem Adapter (use with a modem cable when connecting a terminal) Minimum Pin-Out Modem cable end 25-pin female 2 3 4 5 6 8 20 7 Hub end 25-pin male 2 3 4 5 6 8 20 7 OR 4 5 4 5 DTR (pin 20) and RTS (pin 4) must be on, or high, on your terminal or in your terminal emulation program.
RS-232-C Modem Cable Minimum Pin-Out Modem end Hub end 25-pin male 25-pin male Signal 2 3 4 5 6 7 8 20 22 23 2 3 4 5 6 7 8 20 22 23 Tx Rx RTS CTS DSR GND CD OR DCD DTR RI DRS – typically on V.24 (European) modems Console Port Loopback Connector The loopback connector shown below is useful for troubleshooting the console port on your HP EtherTwist Hub/12, Hub Plus, and Hub Plus/48.
B Specifications HP 28684B Hub/12 and HP 28688B Hub Plus Physical Dimensions: Weight: 42.5 cm by 23.5 cm by 4.4 cm (16.8 in by 9.3 in by 1.7 in) 2.7 kg (6.0 lb) Electrical (The HP 28684B and HP 28688B hubs automatically adjust to any voltage between 90 and 240 volts and any frequency between 50 and 60 Hz.) ac voltage: 100-120 volts 200-240 volts Maximum current: 0.5 amps 0.
Cable Interfaces The 50-pin twisted-pair port is compatible with the IEEE 802.3 Type 10Base-T standard. The ThinLAN port is compatible with the IEEE 802.3 Type 10Base2 standard. The AUI port is compatible with IEEE 802.3 standards. The RS-232-C console port conforms to V.22 bis.
HP 28699A Hub Plus/48 Physical Dimensions: Weight: 42.5 cm by 23.5 cm by 8.9 cm (16.8 in by 9.3 in by 3.5 in) 3.8 kg (8.8 lb) Electrical (The HP 28699A hub automatically adjusts to any voltage between 90 and 240 volts and any frequency between 50 and 60 Hz.) ac voltage: 100-120 volts 200-240 volts Maximum current: 0.6 amps 0.
Electromagnetic Emissions *FCC part 15 Class A CISPR-22 Class A *EN 55022 Class A *VCCI Class I Immunity ESD (in US, Canada, and Latic America) (in Europe) (in Japan) *prEN 55101-2 (1991) / IEC 801-2 (3 kV CD, 8 kV AD) (in Europe) Radiated Emissions *prEN 55024-3 (1991) / IEC 801-3 (draft) (3 V/m) (in Europe) * These specifications are legal requirements in the indicated countries.
C Modem Configuration HP 35031A Support Link II At the hub end: At the user end: Configure SOFT OPTION 6 to 1. Configure SOFT OPTION 15 to 2. Configure SOFT OPTION 16 to 2. Configure SOFT OPTION 20 to 2. Configure SOFT OPTION 21 to 2. Configure SOFT OPTION 16 to 2. HP 50759A Support Link At the hub end: For an 8-position switch, set switch 4 down, all others up. For a 4-position switch, set switch 2 up, all others down.
Black Box V.32 9600 Async. At the hub end: Load the factory option set #1.
D Network Addressing (HP 28688B and HP 28699A Only) The HP 28688B EtherTwist Hub Plus and the HP 28699A Hub Plus/48 can be managed over the network by HP network management products, and any other network management products that comply with the Simple Network Management Protocol (SNMP) standard. The communication between the SNMP network management station and the hub takes place using the network layer protocols, IPX for Novell networks, or IP for TCP/IP networks.
IPX Addressing Notes: Because the IPX address is assigned automatically, no IPX configuration is necessary; no IPX configuration is provided on the hub console interface. By default, the hub is ready to be managed by an SNMP network management station that is configured for IPX communications. If your hub is part of a network that is running IPX only, you do not need to perform the IP configuration.
Building Your Own IP Addressing Scheme If your network is isolated and will not be connected to any other networks that use IP addressing, you can build your own IP addressing scheme. If you use your own addressing scheme, be aware that any connection to another IP network could cause communication problems on both networks. The IP addresses on the two networks must be compatible. Each address must be unique.
The IP address format is X.X.X.X, where each X is an integer between 1 and 255. The integers are separated by decimal points. For a given network with its own class C addressing scheme, the first three integers of each address must be the same. The fourth integer must be unique for each addressed device. Do not use 0 or 255 in the fourth position. They are reserved integers.
E Backup Links (HP 28688B and HP 28699A Only) Description In some network configurations a critical link exists, for example between two workgroups that regularly share or exchange data over the network. To maintain the integrity of such a critical link, the HP EtherTwist Hub Plus and Hub Plus/48 offer a backup link feature. A backup link is a separate cable run between two hubs that is automatically enabled if the connection designated as the primary link fails. 802.
Limitations Each hub can monitor a single backup link (only one backup link can be configured on each hub). But, the hub may be at the remote end of one backup link and at the monitoring end of a backup link to a different hub. A given hub should be connected to the remote end of no more than two backup links. If it is functioning as the remote hub in more than two backup links, it may not be able to respond to the test packets fast enough when there is a high level of data traffic on the network segments.
Configuring a Backup Link Configure the Monitoring Hub Only. All configuration of the backup link is performed from the console on the hub that is responsible for monitoring the backup link. On the remote hub, you only need to make sure the ports used in the primary and backup links are both enabled. Use the Console’s Backup Command. To configure this link, you use the Backup command on the hub console interface.
Identifying the Backup Link The ports designated as the primary and backup ports are identified on the hub console’s Status command screen by the words (PRI) and (BKUP), respectively, next to the port numbers. HP network management products can also be used to identify the backup link. See the HP network management product’s documentation for more information.
Reactivating the Primary Link When the primary link is repaired, you can use any of the following methods to reenable the primary port: From the hub’s console, use the Port command, PO n ON where n is the primary port’s ID. Cycle power on the hub. This is useful if you do not have access to the hub’s console interface (for example, because the hub is in a wiring closet and a console is not connected). From an HP network management station, reenable the port or reset the hub.
Sample Topologies Following are two simple sample topologies that may give you some ideas on how a backup link could be used in your network. Sample 1: EtherTwist Hub-to-EtherTwist Hub In this sample topology, the primary and backup links consist of twisted-pair cable segments between an HP EtherTwist Hub Plus/48 and an HP EtherTwist Hub Plus.
Sample 2: Backup Link Using Alternative Medium In this topology, the primary link consists of a twisted-pair cable between twisted-pair ports on a Hub Plus/48 and a Hub Plus; the backup link is from AUI port to AUI port on the two hubs. Depending on the type of transceivers used, the backup link could use thin coax, fiber-optic cable, or even twisted-pair cable. Note that any of the network ports on these hubs can function as a backup to any other port.
Safety Information Safety Symbols Documentation reference symbol. If the product is marked with this symbol, refer to the product documentation to get more information about the product. WARNING A WARNING in the manual denotes a hazard that can cause injury or death. CAUTION A CAUTION in the manual denotes a hazard that can damage equipment. Do not proceed beyond a WARNING or CAUTION notice until you have understood the hazardous conditions and have taken appropriate steps.
Informations concernant la sécurité Symboles de sécurité Symbole de référence à la documentation. Si le produit est marqué de ce symbole, reportez-vous à la documentation du produit afin d’obtenir des informations plus détaillées. AVERTISSEMENT Dans la documentation, un AVERTISSEMENT indique un danger susceptible d’entraîner des dommages corporels ou la mort. ATTENTION Un texte de mise en garde intitulé ATTENTION indique un danger susceptible de causer des dommages à l’équipement.
Hinweise zur Sicherheit Sicherheitssymbole Symbol für Dokumentationsverweis. Wenn das Produkt mit diesem Symbol markiert ist, schlagen Sie bitte in der Produktdokumentation nach, um mehr Informationen über das Produkt zu erhalten. VORSICHT Eine VORSICHT in der Dokumentation symbolisiert eine Gefahr, die Verletzungen oder sogar Todesfälle verursachen kann. ACHTUNG ACHTUNG in der Dokumentation symbolisiert eine Gefahr, die das Gerät beschädigen kann.
Considerazioni sulla sicurezza Simboli di sicurezza Simbolo di riferimento alla documentazione. Se il prodotto è contrassegnato da questo simbolo, fare riferimento alla documentazione sul prodotto per ulteriori informazioni su di esso. PERICOLO La dicitura PERICOLO denota un pericolo che può causare lesioni o morte. ATTENZIONE La dicitura ATTENZIONE denota un pericolo che può danneggiare le attrezzature.
Consideraciones sobre seguridad Símbolos de seguridad Símbolo de referencia a la documentación. Si el producto va marcado con este símbolo, consultar la documentación del producto a fin de obtener mayor información sobre el producto. ADVERTENCIA Una ADVERTENCIA en la documentación señala un riesgo que podría resultar en lesiones o la muerte. PRECAUCION Una PRECAUCION en la documentación señala un riesgo que podría resultar en averías al equipo.
Safety Information 6 Safety Information
Regulatory Statements FCC Statement (For U.S.A. Only) Federal Communications Commission Radio Frequency Interference Statement Warning: This equipment generates, uses, and can radiate radio frequency energy. If it is not installed and used in accordance with the instruction manual, it may cause interference to radio communications.
Declaration of Conformity The following Declarations of Conformity for the HP 28684B, HP 28688B, and HP 29699A comply with ISO/IEC Guide 22 and EN 45014. The declarations identify the product, the manufacturer’s name and address, and the applicable specifications that are recognized in the European community.
Regulatory Statements 3
4 Regulatory Statements
One-Year Limited Hardware Warranty Hewlett-Packard warrants this computer hardware product against defects in materials and workmanship for a period of one year from receipt by the end user. If HP receives notice of such defects during the warranty period, HP will, at its option, either repair or replace products that prove to be defective.
HP has conducted limited testing with certain non-HP products to determine compatibility with the hubs. Please contact your HP authorized LAN dealer or HP representative for the current list of tested products. HP relies in part upon information from the suppliers of non-HP products and makes no warranty, expressed or implied, with respect to the operation of these products or their compliance with worldwide regulatory requirements.
Index A Accessories kit, 1-3 Alignment errors, 3-4 AUI ports, 1-1, 2-9 Auto-segmentation, 1-2, 1-7 B BAckup command, 3-3 Backup default router, 3-6 Backup link, 1-2 Backup links, E-1 Backup port, 3-3 Baud rate, 2-14, 2-16 Broadcast packets, 3-4 C Cable interfaces, B-2 Cables and connectors, A-1 Collision detection, 1-6 Collisions, 3-4 Configuration commands, 2-17 Connecting a console, 2-14 Connecting a modem and terminal, 2-15 Connecting a terminal directly, 2-14 Connecting computers, 2-8 Connecting other h
COunters command, 3-4 CRC errors, 3-4 D Declaration of conformity, C-2 Diagnosing with the LEDs, 4-3 Diagnostic tests, 4-4 E Echo request packet, 1-2 electromagnetic specifications, B-2, B-4 Errors, 3-4 Ethernet address, 3-5 F Features, 1-1 Firmware enhancements, 1-2, 1-8 G Giant packets, 3-4 H HElp command, 3-2 How the hub works, 1-6 HP, 3-2 HP 28684B accessories kit, 1-3 cable interfaces, B-2 cables and connectors, A-1 configuration commands, 2-17 connecting a modem and terminal, 2-15 connecting computers
firmware enhancements, 1-2, 1-8 how it works, 1-6 included parts, 1-3 installation, 2-1 mounting, 2-1 network address, 1-9 operation, 3-1 ports, 1-1 power cord, 1-3 specifications, B-1 starting a console session, 3-1 station address, 1-2 status LEDs, 1-4 testing ports and links, 4-5 troubleshooting, 4-1 HP 28688B accessories kit, 1-3 backup links, E-1 cable interfaces, B-2 cables and connectors, A-1 configuration commands, 2-17 connecting a modem and terminal, 2-15 connecting computers, 2-8 connecting to a
troubleshooting, 4-1 HP 28699A accessories kit, 1-3 backup links, E-1 cable interfaces, B-3 cables and connectors, A-1 configuration commands, 2-17 connecting a modem and terminal, 2-15 connecting computers, 2-8 connecting to a network backbone, 2-8 connecting to devices and networks, 2-8 diagnosing troubles, 4-3 diagnostic tests, 4-4 features, 1-1 firmware enhancements, 1-2, 1-8 how it works, 1-6 included parts, 1-3 installation, 2-1 mounting, 2-5 network address, 1-9 network addressing, D-1 network manage
L LEDs, 1-2 LEDs, diagnosing with, 4-3 LEDs, status, 1-4 Link beat, 1-7 Linkbeat command, 3-7 M MAC address, 3-5 Modems, C-1 Mounting brackets, 1-3 Mounting the hub, 2-1 N Network address, 1-9 Network addressing, D-1 Network management, 1-8 Network management, non-HP, 1-9 Novell Netware, D-1 O Operation, 3-1 P Password command, 3-7 Physical address, 3-5 Ping, 1-2 Ping command, 3-7 POrt command, 3-8 Ports, 1-1 Ports, connections, 2-10 Ports, testing, 4-5 Power cord, 1-3 Primary default router, 3-6 Index-5
R Regulatory statements, C-1 - C-4 Remote management, 1-2 Remote station address, 3-3 REset command, 3-8 RS-232-C console port, 1-1 S Safety information, C-1 Self-test, 1-2 specifications electromagnetic, B-2, B-4 SPeed command, 3-8 STatus command, 3-9 Status LEDs, 1-4 Subnet mask, 3-6 T Test packets, 1-2, 3-3 Testing ports and links, 4-5 Testing twisted-pair cabling, 4-5 TEstlink command, 3-10 ThinLAN ports, 1-1, 2-9 THinwatch command, 3-10 Time to live, 3-6 Total packets, 3-4 Troubleshooting, 4-1 Twisted-
Regulatory Information The product described in this document complies with specific international regulations. See the document section entitled “Regulatory Statements” for the applicable regulatory information. Informations concernant la réglementation Le produit décrit dans le présent document satisfait à des normes internationales spécifiques. Pour plus de détails sur les réglementations applicables, reportez-vous à la section «Regulatory Statements».
Printed in U.S.
