The tables defined by this MIB module contain a collection
of managed objects that are general in nature and apply to
an edge device in an organizations network, e.g. a Metro 
Ethernet network. An edge device, is a customer located 
equipment, this is the first device which will connect the
Service Provider's network and map subscriber traffic into
the next layer. The access media could be either CAT5 or
fiber. The access device (edge device) can be designed for
DSL, Ethernet or other technologies, however, this MIB is 
designed for Ethernet. 

Terminology:
UNI - User to Network Interface 
NNI - Network to Network Interface.
ENI - Enhanced Network Interface. Enhanced UNI port.
module/device
    - In an environment (specifically, in an SNMP context)
      consisting of a single chassis which can contain
      multiple cards, the term 'module' refers to a card
      and the term 'device' refers to the whole chassis.
      In an environment where multiple chassis are 'stacked'
      together, the term 'module' refers to a chassis and
      the term 'device' refers to the whole stack.
      In an environment containing only a single chassis
      without removable cards, the terms 'device' and
      'module' both refer to the chassis and its contents.