8222 Model-008 / 016

8222 Nways Ethernet Workgroup Hub (Model 008/016)
(Installation and Planning Guide P/N 13H8441 Feb-95 U.S.) 

                                     FRU P/N  OPT P/N
  Ethernet Workgroup Hub Model-008   86H1406
  Ethernet Workgroup Hub Model-016

The Nways Workgroup Hubs are 10BASE-T workgroup hubs. Workgroup hubs are also reffered to as repeaters  or hubs . The Nways Workgroup Hubs conform to the repeater specifications in IEE 802.3 10BASE-T (10BASE-T). The T in the term indicates that unshielded twistet-pair (UTP), shielded twisted-pair (STP), or foiled twisted-pair (FTP) cables are used to connect the devices in the network. The figure on the left side illustrates the IBM 8222 Nways Ethernet Workgroup Hub Model 008 and Model 016.

Using Nways Workgroup Hubs, you can build small 10BASE-T networks. You can also connect those 10BASE-T networks to the following types of IEE 802.3 network segments, each of which uses a different type of cabling.

The hub feature include:

These ports enable to build a 10BASE-T network of two to eight devices (such as personal computers, servers, printers, and point-of-sale terminals) using the Model 008, or two to sixteen devices using the Moodel 016. Each device is connected to the hub by a UTP cable that is up to 10m (328ft) long.

The Port marked MDI  are Medium Dependet Interface-x (MDI-X) ports. These ports perform the crossover function.

The MDI port duplicates the last MDI-X port (labeled as either 8MDI-X  or 16MDI-X , depending on wich model you purchased), but but does not perform the crossover function. These two ports are wired directly together, therefore, you cannot connect devices to both of these ports on a single hub at the same time. However, the addition of the MDI port is very useful since you can connect two hubs (cascade) with straight-through cables, and crossover cables are not needed.

           +---------+           +---------+
           |  8222   |           |  8222   |
           +|-|-|-|-|+           +|-|-|-|-|+
            |   | | +-------------+ |   | |
            |     |                 |     |
       +----+----+             +----+----+
       |  8222   |             |  8222   |
       +|-|-|-|-|+             +|-|-|-|-|+
        |   | | |               |   | | |
        |     | +-+             |     | +-+
     +--+-+    +--+-+        +--+-+    +--+-+
     |    |    |    |        |    |    |    |
     +----+    +----+        +----+    +----+
   +--------++--------+    +--------++--------+
                  Cascading sample

The 10BASE-T, AUI, and BNC ports can be used to connect an Nways Workgroup Hub to other Nways Workgroup Hubs and other types of 10BASE-Thubs, which is called cascading  The most common method of cascading hubs is to connect a straight-through cable from the MDI port on one hub to an MDI-X port on the other hub.

The Rear Panel AUI port  enables to connect an Nways Workgroup Hub and its 10BASE-T connections to a 10BASE5, 10BASE2, or 10BASE-F network segment. This feature is useful for network expansions.

The Rear Panel BNC port  connector can be used to connect an Nways Workgroup Hub to a 10BASE2 network segment using the T-connector (shipped with the kit)

On the Model 008 Rear Panel side, there is an BNC/AUI  switch between the AUI port and the BNC port. Because it is only possible to make connection to one AUI or BNC port.

LED Explanations

Collision  A condition that occurs when two or more devices on a network transmits at the same time.
Frame  The smallest unit of transmission for data and control signals on a network.
Jabbering  A condition in which a device is transmitting a frame that is excessively long.
Partitioned  A state to which the Nways Workgroup Hub will set its port if it detects that the device connected to the port has been involved in more than 30 consecutive collisions or is jabbering. Another name for this state is disabled. While the port is disabled, the Nways Workgroup Hub does not pass frames received through that port. The hub will re-enable the port whenever it receives a good frame from that port.

  LED      State   Explanation
 Power     On        The hub is receiving power from an electrical
 (Green)             outlet and the power is functioning correctly.
           Off       The hub is not connected to an electrical outlet,
                     or there is a problem with the power cord or
                     power supply.
 Collision Blinking  The hub has detected that a device connected to
 (Yellow)            one of its ports (AUI, BNC, or 10BASE-T) has had
                     a collision.
                     The devices that are involved in the collision
                     will perform the collision resolution procedure
                     (specified in IEEE 802.3) automatically.
           Off       The hub does not detect a collision on any of its
                     ports and is operating normally.
 AUI/BNC   Blinking  A cable is connected to the AUI or BNC port, the
 Activity            port detects that a device is connected to the
 (Green)             other end of the cable, and the port is receiving
                     a signal from the device.
           Off       A cable is not connected to the AUI or BNC port,
                     or there is a problem with the cable, the port,
                     or the device at the other end of the cable.
 AUI/BNC   On        The hub has partitioned the port because of
 Partition           excessive collisions or jabbering by the device
  Yellow)            connected to the port.
           Off       The port is enabled (the normal state).
 10BASE-T  On        A cable is connected to the 10BASE-T port, the
 Link/Act.           port detects that a device is connected to the
 (Green)             other end of the cable, and the port can receive
                     a signal from the device.
           Blinking  The 10BASE-T port is currently receiving a frame
                     through that port.
           Off       A cable is not connected to the 10BASE-T port, or
                     there is a problem with the cable, the port, or
                     the device at the other end of the cable.
 10BASE-T  On        The hub has partitioned the port because of
 Partition           excessive collisions or jabbering by the device
 (Yellow)            connected to the port.
           Off       The port is enabled (the normal state).
 RJ-45 connector


 Wiring in a Straight-Through Cable


 Wiring in a Crossover Cable


 AUI Port Connector Pin Assignments (DB-15)
 Pin    Signal
 Number Name      Description

  3     DO-A      Data out circuit A
 10     DO-B      Data out circuit B
 11     DO-S      Data out circuit shield
  5     DI-A      Data in  circuit A
 12     DI-B      Data in  circuit B
  4     DI-S      Data in  circuit shield
  7     CO-A      Control out circuit A
 15     CO-B      Control out circuit B
  8     CO-S      Control out circuit shield
  2     CI-A      Control in  circuit A
  9     CI-B      Control in  circuit B
  1     CI-S      Control in  circuit shield
  6     VC        Voltage common
 13     VP        Voltage Plus
 14     VS        Voltage shield
 Shell  PG        Protective ground

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