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     HP EtherTwist Hub/8, Technical Data
        Product Number 28691A
     The HP 28691A EtherTwist Hub/8 is a 10Base-T multiport repeater that
     includes eight twisted-pair ports and one thin coaxial (BNC) port. The
     Hub/8 repeats and retimes signals, handles collision management, and
     monitors individual link status. In addition, the hub automatically
     segments individual ports disturbing the network and reconnects them
     when the problems are cleared.
        The Hub/8 can be used in small networks with just Hub/8s. In
     addition, it may be cascaded from other hubs such as the HP EtherTwist
     Hub Plus to add more nodes in an office.
     
     Highlights
     Low-Cost LAN Infrastructure:  The HP EtherTwist Hub/8 gives you a low
     connection cost that used to be possible only with ArcNet and thin coax,
     while delivering the speed and reliability of 10Base-T (Ethernet on
     twisted-pair cabling).
        Simple Plug-and-Play Operation:  The Hub/8 is designed to simplify
     the installation and startup of your LAN. Twisted-pair cable plugs
     directly into the RJ-45 ports, and coaxial backbone cable can be
     connected to the integrated BNC port. No configuration or special setup
     is required, which allows you to start up your LAN in minutes.
        Topology Flexibility:  Hub/8s can stand alone to support up to eight
     users or be combined to support larger networks in various
     configurations. Hubs can be connected using the BNC port with thin
     coaxial backbone cable, or cascaded with twisted-pair cable. Either way
     gives you growth paths for the future.
     
     Features
     o Provides eight twisted-pair ports using 8-pin modular (RJ-45) plugs
       and one thin coaxial (BNC) port.
     o Includes self-test for fault isolation
     o Supports up to 100 meters of cable (typically) between hub and
       twisted-pair transceiver or PC adapter card; greater distances are
       possible with low-loss cable.
     o Includes LEDs for Port Status, Collisions, Activity, Fault, and Power,
       providing quick hub status checks and troubleshooting.
     o Can be wall mounted or stacked on a table top.
     o Operates transparently to network operating system software.
     o Supports both IEEE 802.3 and Ethernet.
     o Provides auto-segmentation of ports for fault isolation and improved
       network integrity.
     o Detects wiring polarity faults on the twisted-pair cable and
       automatically switches polarity to compensate for the wiring error.
     o Supports multi-hub configurations using either a thin coaxial backbone
       between BNC ports or twisted-pair cascading between twisted-pair
       ports.
     o Supports voice and data signals in the same cable bundle.
     o Installs in minutes.
     
     Flexible Topology
     The EtherTwist Hub/8s can be connected to one another by cascading with
     twisted-pair cables (crossover required) or daisy-chained on thin
     coaxial cable. The Hub/8 can be added easily to an existing ThinLAN

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     network by plugging on to BNC port. This allows you to grow your network
     with a minimum of effort.
     
     Compatibility to Meet Your Changing Needs
     HP's EtherTwist hubs are fully compliant with the 10Base-T standard.
     Hewlett-Packard has done extensive compatibility testing with other
     10Base-T equipment on the market today, giving you the confidence you
     need to build a multivendor network that best fits your business
     requirements.
     
     Maximum Reliability Through Fault Isolation
     An HP EtherTwist hub automatically identifies any segment disturbing the
     network and disconnects it from the rest of the network
     (autosegmentation), ensuring network integrity. Once the problem is
     corrected, the hub automatically reconnects the segment.
     
     HP WireTest and Cabling
     HP EtherTwist LANs use twisted-pair cabling (ordinary telephone wire).
     Two pairs of 22, 24, or 26 AWG unshielded twisted-pair wire are required
     for each connection. Shielded twisted-pair wire can also be used.
        The HP WireTest Service is available to qualify your existing
     telephone cabling for use in a Type 10Base-T network. Contact your local
     HP Sales and Support Office or your HP Authorized LAN Dealer for
     information and availability of this service. If you have a large
     network and wish to do your own testing, you can purchase the HP 28687A
     Wire Test Instrument.
     
     Specifications
        Environmental Characteristics
     Operating Temperature:
     5 degrees C to 40 degrees C (41 degrees F to 104 degrees F)
     
     Relative Humidity:  15% to 95% at 40 degrees C (104 degrees F)
     noncondensing
     
     Physical and Electrical Characteristics
        Dimensions:  21.3 cm by 15.1 cm by 4.6 cm (8.4 in by 5.9 in by
     1.8 in)
     
     Weight:  1.0 kg (2.2 lb)
     
     Power Consumption:
     AC Voltage:         100-120 V 200-240 V
     Current:            0.2 A max 0.1 A max
     Frequency:          50/60 Hz  50/60 Hz
     
     The HP EtherTwist Hub/8 automatically adjusts to any voltage between 90
     and 240 volts.
     
     Standards
        Communications:
     IEEE 802.3 Type 10Base-T
     IEEE 802.3 Type 10Base2
        Safety:

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     UL 1950
     CSA 220
     CSA 950
     Verified to IEC 950 / EN 60950
     Emissions:
     FCC Part 15 Class A
     CISPR-22 Class A / EN 55022
     VCCI Class 1
        Immunity:
     ESD:
     IEC 801-2 Level 3 (10 kV)
     EN 55101-2
     Radiated Emissions:
     IEC 801-3 Level 2 (3 V/m)
     EN 55101-3
     
     Warranty
     The HP 28691A EtherTwist Hub/8 is warranted for two years against
     defects.
     
     Ordering Information
     HP 28691A EtherTwist Hub/8 includes hub, wall mount kit, "T" connector,
     and manual.
     
     From HP Networking Communications Specification Guide,
        5091-3821E, 9205, p 543
     Associated files: A3821543.DOC
     HP EtherTwist Hub/8, Technical Data