The COSINE and Internet X.500 Schema
Status of this MemoThis 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.
AbstractThis document suggests an X.500 Directory Schema, or Naming Architecture, for use in the COSINE and Internet X.500 pilots. The schema is independent of any specific implementation. As well as indicating support for the standard object classes and attributes, a large number of generally useful object classes and attributes are also defined. An appendix to this document includes a machine processable version of the schema.This document also proposes a mechanism for allowing the schema to evolve in line with emerging requirements. Proformas to support this process are included.Corrections and additions to the schema should be sent to naupdate@cs.ucl.ac.uk list, as described within.
Status of this Memo This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
This paper describes some work which helps users of the X.500 directory to understand the unevenness of quality of service (QOS) concomitant with a widely distributed directory. In particular a user may see highly variant response times and availability of information for different parts of the directory.The paper discusses, and dismisses, two possible sources of QOS information. I use a third approach whereby a directory user interface maintains a record of response times and information availability and uses this database to provide a user with feedback about those aspects of the service. The DE user interface has been modified to incorporate this facility. The technique used also provides directory managers with a view of directory performance from a user's perspective.The work described has been partly funded by the PARADISE projects, through the European COSINE project and VALUE programme.
DSL technology has been incredibly successful at allowing copper telephony wires to deliver broadband services. However, the physics of copper dictates that as speeds increase further it will be necessary to push optical fibre closer to the customer -to the cabinet, and ultimately to the premises. Deploying optical fibre to the mass consumer is well known as representing a significant capital investment and will take many years to deploy. It would be fair to say that putting fibre in the residential access network is a 'once in a century' investment. There are many different choices of 'high fibre' broadband access systems and as technology develops further, this situation is likely to continue. When operators deploy fibre in the access network, it is therefore vital that they do so in a future-proof manner which can support technologies and architectures yet to come, and allow migration and further evolution.
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