5





     HP ThinLAN Hub Plus, Technical Data
        Part Number 28692A
     The HP 28692A ThinLAN Hub Plus is a 10-Mbit/s multiport repeater used to
     interconnect personal computers and other network devices over thin
     coaxial cable local area networks (thinLANs) that comply with the IEEE
     802.3 Type 10Base2 standard. The HP ThinLAN Hub Plus repeats data
     received from an attached LAN segment to all other segments attached to
     the other hub ports. The HP ThinLAN Hub Plus extends your network by
     connecting thinLAN segments in a star topology. Attached to each thinLAN
     segment can be hubs, bridges, and routers, or PCs and computers.
        Coupled with HP OpenView Resource Manager, ThinLAN Hub Pluses are
     capable of providing instrumentation-like functions across your network.
     This will eliminate the need for a LAN analyzer per segment. HP EASE
     (Embedded Advanced Sampling Environment) is a breakthrough technology
     that allows HP EtherTwist devices to do protocol analyses. This will
     identify top talkers, heavy users, errors, and communication pairs.
     
     Features
     o Provides nine thinLAN coaxial ports using BNC connectors and one AUI
       port. The AUI port allows simultaneous connection to thin or thick
       coaxial, fiber-optic, or twisted-pair cable via a transceiver.
     o Is compatible with the IEEE 802.3 Type 10Base2 standard.
     o Supports 10-Mbit/s link speed.
     o Supports both IEEE 802.3 and Ethernet.
     o Provides cable fault detection.
     o Isolates network faults by automatically segmenting ports disturbing
       the network.
     o Includes LEDs for a quick visual check of port status, collisions,
       activity, and power.
     o Provides console (RS-232) port, which allows users to read network
       statistics and configure ports in the hub. This port connects to a
       terminal or terminal emulator either directly or via a modem.
     o Includes diagnostics for checking port functionality and loopback test
       for troubleshooting cable problems.
     o Is transparent to network operating system software.
     o Supports SNMP/IP- and IPX-based network management. Specifically, the
       hub can be managed from a central network management station using
       HP OpenView Hub Manager (HP 28686D) or HP OpenView Interconnect
       Manager/DOS (HP 27256D).
     o Mounts in a standard 19-inch rack with cables facing front or back, on
       a wall (flat or on end), or on any horizontal surface like a shelf or
       table. Since the hub is only 31/2 inches high (two rack spaces), it
       takes up very little space in any mounting configuration.
     
     Functional Description
     The HP ThinLAN Hub Plus is a multiport repeater. Data signals that come
     into the hub from any of its ports are automatically regenerated and
     transmitted to all the other hub ports. The hub regenerates the data
     without interpreting the contents, so it can be used in either IEEE
     802.3 or Ethernet networks and with any upper-level protocol.
        The hub also performs collision detection. A collision occurs when
     two or more network devices try to transmit at the same time. When the
     hub detects this, it stops repeating either of the transmissions and
     starts transmitting a jamming signal. The jamming signal tells the

6





     transmitting devices that a collision has occurred. The colliding
     devices then stop transmitting for a random amount of time before
     attempting to retransmit the data. Once the collision condition is
     removed, the hub stops transmitting the jamming signal, and normal
     operation is restored.
        The HP ThinLAN Hub Plus will automatically disable (autosegment) a
     port if the port experiences excessive collisions (greater than 30
     consecutive collisions). The port will automatically return to operation
     if the excessive collision condition goes away.
     
     Functional Specifications
        Environmental Characteristics
     Operating Temperature:  0 degrees C to 55 degrees C (32 degrees F to 131
     degrees F)
     
     Relative Humidity:  15% to 95% at 40 degrees C (104 degrees F)
     noncondensing
     
     Physical and Electrical Characteristics
        Dimensions:  42.6 cm by 23.5 cm by 8.9 cm (16.8 in by 9.3 in by
     3.5 in)
     
     Weight:  4.0 kg (8.8 lb)
     
     Power Consumption:
     ac Voltage:         100-120 V 200-240 V
     Current:            0.8 A max 0.6 A max
     Frequency:          50/60 Hz  50/60 Hz
     
     The HP ThinLAN Hub Plus automatically adjusts to any voltage between 90
     and 240 volts.
     
     Standards
        Communications:
     IEEE 802.3 Type 10Base2
        Safety:
     UL 1950
     CSA 950
     Verified to IEC 950/EN 60950
        Emissions:
     FCC Part 15 Class A
     CISPR-22 Class B
     EN 55022 Class B
     VCCI Class 2
        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
     
     Ordering Information
     HP 28692A ThinLAN Hub Plus

7





     
     Warranty
     The HP 28692A ThinLAN Hub Plus is warranted for one year against
     defects.
     
     From HP Networking Communications Specification Guide,
        5091-3821E, 9205, p 548
     Associated files: A3821548.DOC
     HP ThinLAN Hub Plus, Technical Data