RFC 1407 (rfc1407) - Page 3 of 43

Definitions of Managed Objects for the DS3/E3 Interface Type

RFC 1407                       DS3/E3 MIB                   January 1993


   The syntax of an object type defines the abstract data structure
   corresponding to that object type.  The ASN.1 language is used for
   this purpose.  However, the SMI [3] purposely restricts the ASN.1
   constructs which may be used.  These restrictions are explicitly made
   for simplicity.

   The encoding of an object type is simply how that object type is
   represented using the object type's syntax.  Implicitly tied to the
   notion of an object type's syntax and encoding is how the object type
   is represented when being transmitted on the network.  The SMI
   specifies the use of the basic encoding rules of ASN.1 [8], subject
   to the additional requirements imposed by the SNMP.

2.1.  Format of Definitions

   Section 4 contains contains the specification of all object types
   contained in this MIB module.  The object types are defined using the
   conventions defined in the SMI, as amended by the extensions
   specified in STD 16, RFC 1212 [13].

2.2.  Changes from RFC 1233

   This MIB obsoletes RFC 1233.  The changes from RFC 1233 are the
   following:

      --  This MIB module contains information to manage
          an E3 interface, also.

      --  This MIB module contains three groups:
           DS3/E3 Near End Group which is mandatory,
           DS3 Far End Group which is optional, and
           DS3 Fractional Group which is optional.

      --  The DS3 Far End Group is a new group and contains
          configuration information and statistics
          that are collected from the far end DS3/E3 interface.
          Presently, the Far End Group may only be implemented by
          DS3 systems that use C-bit Parity or SYNTRAN.

      --  The DS3 Fractional Group is a new group and is
          modeled after the DS1 Fractional Group.

      --  ds3CSUIndex has been redefined and renamed
          to dsx3LineIndex.  This object
          is the identifier of a DS3/E3 Interface on a device.
          On a CSU, a single DS3/E3 data stream will cross two DS3/E3
          interfaces, which have separate dsx3LineIndex values.




Trunk MIB Working Group