The MIB module for configuration of bulk distribution
(de-multiplexing of traffic from higher-bandwidth to 
lower-bandwidth interfaces).
        
Terminology :
        
bulk-distribution        : The bulk distribution is the 
                           feature by which a line/interface
                           on one module can replace the line
                           for the other.
        
bulk-distribution module : The module which links its 
                           interfaces to the target module.
        
target module            : A module that gets incoming traffic
                           from a bulk distribution module 
                           rather than from a back card.
                     
The Module which supports bulk distribution, converts 
traffic from its lines (may be T3, OC-N) to lines on 
the target module (may be
T3, T1 etc). The bulk distribution is achieved by having a 
point-to-point connection (bulk-distribution bus) between the 
bulk-distribution module and the target module. The benefit 
of bulk distribution is that the target module need not have
the back cards. The lines/interfaces from bulk-distribution
module will be used as lines for the target module.
        
An example is given here on linking interfaces.
        
        
   |------------------------------------------------|
   |                                                |
   |             |------------------------------|   |
   |             |           |             |    |   |
   |             |           |-------------|    |   |
 Ta|rget Module  |           |             |    |   |
-------       -------     -------     ---------------
|     |       |     |     |     |     |              |
|     |       |     |     |     |     |              |
|  T1 |       | T1  |     |T1   |     | Bulk         |
|card |       |card |     |card |     | Distribution |
|     |       |     |     |     |     |              |
|     |       |     |     |     |     | Module       |
|     |       |     |     |     |     |              |
|     |       |     |     |     |     | (T3 card)    |
|     |       |     |     |     |     |              |
-------       -------     -------      ---------------