in Index   Prev   Next

RFC 4152

A Uniform Resource Name (URN) Namespace for the Common Language Equipment Identifier (CLEI) Code

Pages: 7

Top   ToC   RFC4152 - Page 1
Network Working Group                                          K. Tesink
Request for Comments: 4152                                        R. Fox
Category: Informational                           Telcordia Technologies
                                                             August 2005

                A Uniform Resource Name (URN) Namespace
        for the Common Language Equipment Identifier (CLEI) Code

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).


This document describes a Uniform Resource Name (URN) namespace (RFC 3406) for the assignment of the Common Language Equipment Identifier (CLEI) code, which is used in messages standardized by ANSI. The URN namespace is managed by Telcordia Technologies, Inc., as the maintenance agent for ANSI T1.213. The CLEI code is a globally unique, ten-character alphanumeric intelligent code assigned by Telcordia Technologies at the request of equipment suppliers. The CLEI code identifies communications equipment by specifying product type and features. There is a one-to-one relationship between a CLEI code and supplier's product ID (the manufacturer's name and the part number along with its version number).

Table of Contents

1. Introduction ....................................................2 2. Specification Template ..........................................2 3. Examples ........................................................4 4. Namespace and Community Considerations ..........................4 5. Security Considerations .........................................5 6. IANA Considerations .............................................5 7. Acknowledgments .................................................5 8. Normative References ............................................5
Top   ToC   RFC4152 - Page 2

1. Introduction

Many circuit cards used in the global telecommunications network have a CLEI code assigned and have a bar code or two-dimensional symbol on a label affixed to the front. Service providers utilize the CLEI code to: o Track inventory, both working and spare o Handle logistics (movement of circuit cards, along with the serial number) o Provision equipment o Maintain asset records (accounting information) The goal of the CLEI namespace is to ensure the stability and uniqueness of the names of various (specific) items that are used within the messages exchanged between equipment of the global telecommunications network. The assigned maintenance agent for the CLEI code, Telcordia Technologies, is responsible for assigning certain equipment and other identifiers (e.g., location, manufacturer/supplier) for the telecommunications industry. The code assignment process identifies the structure and intelligence of the CLEI code to identify the circuit card's form, fit, functions, and features. Equipment may exist in multiple physical locations with the exact same form, fit, functions, and features; such equipment will have the same CLEI code if their product ID is the same.

2. Specification Template

Namespace ID: "CLEI" Registration information: Version 1 Date: 2004-12-31 Declared registrant of the namespace: Telcordia Technologies, Inc. Customer Support Center 8 Corporate Place Piscataway, NJ 08854
Top   ToC   RFC4152 - Page 3

   Declaration of syntactic structures:

      The structure of the Namespace Specific String is a flat space of
      10 characters, as defined in [T1.213][T1.213a].

   Relevant ancillary documentation:

      [T1.213] and [T1.213a].

   Identifier uniqueness considerations:

      Identifiers are assigned by Telcordia URN registration that
      guarantees uniqueness for items with different form, fit,
      functions, and features.  This is achieved simply by comparing all
      new proposed names to the already assigned names contained in a
      database.  If the name already exists, a new one is created per
      the rules of the process.  See [T1.213][T1.213a] for assignment

   Identifiers persistence considerations:

      The process defined by ANSI and the CLEI maintenance agent ensure
      that the binding between the name and its resource is permanent,
      and that names are not reassigned.

   Process of identifiers assignment:

      A CLEI code is an intelligent code that consists of 10
      alphanumeric characters with 4 data elements.  The first data
      element is considered the basic code with the first 2 characters
      indicating the technology or equipment type, and the third and
      fourth characters denoting the functional sub-category.  The
      second data element represents the features, and its three
      characters denote functional capabilities or changes.  The third
      data element has one character and denotes a reference to a
      manufacturer, system ID, specification, or drawing.  The fourth
      data element consists of two characters and contains complementary
      data.  These two characters provide a means of differentiating or
      providing uniqueness between the eight character CLEI codes by
      identifying the manufacturing vintage of the product.  Names are
      assigned via procedures defined in [GR485].
Top   ToC   RFC4152 - Page 4
   Process for identifier resolution:

      Telcordia URNs are resolved via Telcordia resolvers run under
      Telcordia responsibility.  For further information see

   Rules for lexical equivalence:

      Lexical equivalence of two CLEI URN namespace specific strings is
      defined as an exact, case-insensitive string match.  CLEI codes
      are assigned in a case-insensitive fashion, so that there will not
      be two CLEI codes that differ only in case.  See [T1.213] and
      [T1.213a] for further information.

   Conformance with URN syntax:

      No special consideration.

   Validation mechanism:

      None specified.



3. Examples

The following three examples are based on the examples provided in [T1.213a], and correspond with three different sets of features by three different manufacturers (Nortel Networks, Lear, and Lucent Technologies) producing "D4CE" (a particular D4 channel bank type) equipment. The fourth example refers to a SONET power unit convertor of Alcatel. URN:CLEI:D4CE18B7AA URN:CLEI:D4CE4248AA URN:CLEI:D4CE363PAB URN:CLEI:SNPWBBC7AA

4. Namespace and Community Considerations

CLEI codes have historically been used in a variety of communications equipment (see examples above and [T1.213a]). There are circumstances in which entities with CLEI codes need to be managed or exposed in a larger context, such as the general Internet. In these
Top   ToC   RFC4152 - Page 5
   cases, the use of the CLEI URN namespace will provide general
   interoperability benefits to the Internet at large, as well as to
   specific internets.

5. Security Considerations

There are no additional security considerations other than those normally associated with the use and resolution of URNs in general. However, note that attempting to resolve a Telcordia URN through a resolver other than the one provided by Telcordia is not considered authoritative.

6. IANA Considerations

The IANA has registered the formal URN namespace CLEI within the IANA registry of URN NIDs.

7. Acknowledgments

The contributions of the Entity MIB Working Group members are gratefully acknowledged. Special thanks go to Mike Heard, Juergen Schoenwaelder, Dave Perkins, and Dan Romascanu.

8. Normative References

[RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom, "Uniform Resource Names (URN) Namespace Definition Mechanisms", RFC 3406, October 2002. [T1.213] ATIS T1.213-2001, Coded Identification of Equipment Entities in the North American Telecommunications System for Information Exchange, 2001, [T1.213a] ATIS T1.213a, Supplement to T1.213-2001, Coded Identification of Equipment Entities in the North American Telecommunications System for Information Exchange, to correct the representation of the Basic Code in Figure B.1, 2001, [GR485] GR-485-CORE, COMMON LANGUAGE Equipment Codes (CLEI Codes), Generic Requirements for Processes And Guidelines, Issue 5, Telcordia Technologies, April 2004.
Top   ToC   RFC4152 - Page 6

Authors' Addresses

Kaj Tesink One Telcordia Drive Piscataway, NJ 08854 USA Phone: +1 732 699-6068 EMail: Robert H. Fox 3545 S.Ocean Blvd, #417 Palm Beach, FL 33480-5715 USA Phone: +1 732 699-8968 EMail:
Top   ToC   RFC4152 - Page 7
Full Copyright Statement

   Copyright (C) The Internet Society (2005).

   This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

   This document and the information contained herein are provided on an

Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at ietf-


   Funding for the RFC Editor function is currently provided by the
   Internet Society.