Definitions of Managed Objects for RS-232-like Hardware Devices
RFC 1317

Document Type RFC - Proposed Standard (April 1992; No errata)
Obsoleted by RFC 1659
Author Bob Stewart 
Last updated 2013-03-02
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Network Working Group                                 B. Stewart, Editor
Request for Comments: 1317                                  Xyplex, Inc.
                                                              April 1992

                  Definitions of Managed Objects for
                      RS-232-like Hardware Devices

Status of this Memo

   This document 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 RS-232-like

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

   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 1317                    RS-232-LIKE 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 RS-232-like Hardware Device MIB applies to interface ports that
   might logically support the Interface MIB, a Transmission MIB, or the
   Character MIB.  The most common example is an RS-232 port with modem

   The RS-232-like 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

   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.

Character MIB Working Group                                     [Page 2]
RFC 1317                    RS-232-LIKE MIB                   April 1992

   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     |
        |-----------------|        |-----------------|
        | RS-232-like MIB |        | RS-232-like MIB |
        `-----------------'        `-----------------'

   The intent of the model is for the physical-level MIBs to represent
   the lowest level, regardless of the higher level that may be using
   it.  In turn, separate higher level MIBs represent specific
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