xxiiiCisco ONS 15310-CL and Cisco ONS 15310-MA Reference Manual, R8.078-17714-01About this ManualThis section explains the objectives, intended audience, and organization of this publication anddescribes the conventions that convey instructions and other information.Note The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These termsdo not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration.Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco'spath protection feature, which may be used in any topological network configuration. Cisco does notrecommend using its path protection feature in any particular topological network configuration.This section provides the following information:• Revision History• Document Objectives• Audience• Related Documentation• Document Conventions• Obtaining Optical Networking Information• Obtaining Documentation and Submitting a Service RequestRevision HistoryDate NotesMarch 2007 Added this Revision History TableApril 2007 Added server trail information in the Virtual Concatenated Circuits section inChapter 8June 2007 Updated About this Manual chapterAugust 2007 Updated Table 6-2 with VLAN DB Profile information for all usersSeptember 2007 Added a new rule for creation of protection groups under section 1:1 ElectricalCard Protection in the Card Protection chapter.October 2007 Updated the default value for CTX.DS3-PORT.config.FeInhibitLpbk in the Network Element Defaults chapter.