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I use the cloud icon whenever I'm showing an obscured service. &nbsp;(MPLS, the Internet).<br />
I need to show HIPC (Hosted IP Centrex) connected to a Cisco router. &nbsp;Would a cloud be appropriate for this too? &nbsp;<br />
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Is there &nbsp;site, link or a book where this is explicitly stated to be a standard, or recommended practice.<br />
As a matter of fact, is there a site or book where diagramming standards are discussed?
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I use the cloud icon whenever I'm showing an obscured service.  (MPLS, the Internet).
I need to show HIPC (Hosted IP Centrex) connected to a Cisco router.  Would a cloud be appropriate for this too?  

Is there  site, link or a book where this is explicitly stated to be a standard, or recommended practice.
As a matter of fact, is there a site or book where diagramming standards are discussed?

Visio 2010 - When to use the Cloud Icon in a diagram - DEBATE?

Visio is a diagramming and vector graphics application that is part of the Microsoft Office family that allows the user to create diagrams for organizational and planning purposes. The Premium edition has additional templates for more advanced diagrams and layouts, as well as capabilities intended to make it easy for users to connect their diagrams to data sources and to display their data graphically, as well as intelligent rules, validation, subprocess (diagram breakdown). one-step connectivity with Excel data, information rights management (IRM) protection for Visio files, modernized shapes for office layout, detailed shapes for site and floor plans, modern shapes for home plans, and IEEE compliant shapes for electrical diagrams.

Microsoft Visio

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

Network Operations includes asset management, help-desk supervision, security and user policies, infrastructure administration and anything else that affects the operation of your network. Discussions will include those of best practices in platforms, configurations, performance, security and accounting.