Chassis and Module

Refer to Figure 34-1 on page 990. An IBA module is defined as an IBA device that installs in a slot of an IBA chassis. When an IBA module is inserted into an IBA chassis, it connects to the backplane via one or two connectors. Each of these connectors provides the following required signal groups (also see Figure 34-2 on page 991):

  • IBA Link signaling group. This is an IBA link connection to one of two possible ports on the module.

  • The Bulk Power group. Powers the module during normal operation. Supplied at 12V and converted on-board the module into the voltages required by the module's electronics.

  • The Auxiliary Power group. Powers the module management functions (even when Bulk Power is not available). Supplied at 5V and regulated as necessary on-board the module.

Figure 34-1. IBA Module/Chassis Interconnect


Figure 34-2. Backplane Signal Groups


Optionally, the module may also provide the IBA Management Link, or IB-ML, through one of the connectors. IB-ML is a multi-drop, multi-master, two-wire serial bus which uses the SMBus 1.1-based [1] data transfer and arbitration protocols.

[1] System Management Bus Specification, Revision 1.1, December 11, 1998; Copyright (c) 1996, 1997, 1998, Benchmarq Microelectronics Inc., Duracell Inc., Energizer Power Systems, Intel Corporation, Linear Technology Corporation, Maxim Integrated Products, Mitsubishi Electric Corporation, National Semiconductor Corporation, Toshiba Battery Co., Varta Batterie AG.

Each module has two LEDs:

  • Green module Status LED.

  • Yellow or amber Attention LED.

The signal naming conventions used in Figure 34-2 on page 991 are:

  • “w” in a signal name is replaced by:

    - “p” for the positive rail of the differential pair.

    - “n” for the negative rail of the differential pair.

  • “x” in a signal name is replaced by the port number. Can range from 0 to n-1 where n is the number of connectors/ports on the board edge or the backplane.

  • “s” in a signal name:

    - On a board, “s” is replaced by:

    - “t” for an IO plate connector or

    - “b” for a backplane connection.

    - On a backplane, replaced by the slot number.

  • “I” = input signal.

  • “O” = output signal.

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