Definitions of Managed Objects for Character Stream Devices
RFC 1316

Document Type RFC - Proposed Standard (April 1992; No errata)
Obsoleted by RFC 1658
Last updated 2013-03-02
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Network Working Group                                 B. Stewart, Editor
Request for Comments: 1316                                  Xyplex, Inc.
                                                              April 1992

                     Definitions of Managed Objects
                      for Character Stream Devices

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

1.  Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in TCP/IP based internets.
   In particular it defines objects for the management of character
   stream devices.

2.  The Network Management Framework

   The Internet-standard Network Management Framework consists of three
   components.  They are:

   RFC 1155 which defines the SMI, the mechanisms used for describing
   and naming objects for the purpose of management. RFC 1212 defines a
   more concise description mechanism, which is wholly consistent with
   the SMI.

   RFC 1156 which defines MIB-I, the core set of managed objects for the
   Internet suite of protocols.  RFC 1213, defines MIB-II, an evolution
   of MIB-I based on implementation experience and new operational
   requirements.

   RFC 1157 which defines the SNMP, the protocol used for network access
   to managed objects.

   The Framework permits new objects to be defined for the purpose of
   experimentation and evaluation.

3.  Objects

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB. Objects in the MIB are

Character MIB Working Group                                     [Page 1]
RFC 1316                     Character MIB                    April 1992

   defined using the subset of Abstract Syntax Notation One (ASN.1) [7]
   defined in the SMI.  In particular, each object has a name, a syntax,
   and an encoding.  The name is an object identifier, an
   administratively assigned name, which specifies an object type.

   The object type together with an object instance serves to uniquely
   identify a specific instantiation of the object. For human
   convenience, we often use a textual string, termed the OBJECT
   DESCRIPTOR, to also refer to the object type.

   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.

3.1.  Format of Definitions

   Section 5 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 [9,10].

4.  Overview

   The Character MIB applies to interface ports that carry a character
   stream, whether physical or virtual, serial or parallel, synchronous
   or asynchronous.  The most common example of a character port is a
   hardware terminal port with an RS-232 interface.  Another common
   hardware example is a parallel printer port, say with a Centronics
   interface.  The concept also includes virtual terminal ports, such as
   a software connection point for a remote console.

   The Character MIB is one of a set of MIBs designed for complementary
   use.  At this writing, the set comprises:

        Character MIB
        PPP MIB
        RS-232-like MIB
        Parallel-printer-like MIB

Character MIB Working Group                                     [Page 2]
RFC 1316                     Character MIB                    April 1992

   The RS-232-like MIB and the Parallel-printer-like MIB represent the
   physical layer, providing service to higher layers such as the
   Character MIB or PPP MIB.  Further MIBs may appear above these.

   The following diagram shows two possible "MIB stacks", each using the
   RS-232-like MIB.

                                               .-----------------.
                    .-----------------.        |  Standard MIB   |
                    |   Telnet MIB    |        | Interface Group |
                    |-----------------|        |-----------------|
                    |  Character MIB  |        |     PPP MIB     |
                    |-----------------|        |-----------------|
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