1. Reference Material ITU-T ASON and Transport Recommendations

2. ITU-T Recommendations Accessibility Information
Go to the publications link and choose download per URL:
There is an explicit button from the download publications page where you can register up front for 3 free Recommendations

3. Some Key ITU-T ASON Recommendations Fundamental (Protocol-Neutral) Architecture & Requirements
G.8080, Architecture for the automatically switched optical network (ASON), 2006 Revision – to be published imminently
G.7713, Distributed call and connection management (DCM), 2006 Revision, to be published imminently
G.7718, Framework for ASON Management, February ’05
G.7714, Generalized automatic discovery for transport entities, August ’05 revision
ITU-T G.7715/Y Architecture and Requirements for Routing in the Automatic Switched Optical Networks, July 2002
ITU-T G /Y ASON Routing Architecture and requirements for Link State Protocols, Feb. ’04
ITU-T G.7712/Y Architecture and specification of data communication network*, March ’03
ITU-T T G Control Plane Initialiization, Reconfiguration, and Recovery, target Consent Nov. ‘06

4. Textbooks covering ITU-T Architecture Aspects (e. g
Textbooks covering ITU-T Architecture Aspects (e.g., Functional Modeling, ASON)
Broadband Networking: ATM, SDH, and SONET; Michael Sexton and Andrew Reid; ISBN (see in particular Chapters 2 – 4)
Achieving Global Information Networking; Varma and Stephant et al; ISBN: (see in particular Chapters 1-4)
SDH/SONET Explained in Functional Models : Modeling the Optical Transport Network; Huub van Helvoort; ISBN
Optical Networking Standards : A Comprehensive Guide for Professionals ; Khurram Kazi; ISBN: (to be published June 2006; see – for example - Chapters 2, 16)

5. Some Key ITU-T Functional Modeling Recommendations Fundamental Architecture & Equipment
ITU-T Rec. G.803, Architecture of transport networks based on the synchronous digital hierarchy (SDH), March 2003
ITU-T Rec. G Generic functional architecture of transport networks, March 2000
ITU-T Rec. G Functional architecture of connectionless layer networks, March 2003
ITU-T Rec. G.872, Architecture of optical transport networks, November 2001
ITU-T Rec. G.8010, Architecture of Ethernet Layer Networks, February 2004
ITU-T Rec. G.8110, MPLS layer network architecture, January 2005
ITU-T G , Architecture of Transport MPLS (T-MPLS) Layer Network, publication imminent
ITU-T G.783, Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks, March 2006
ITU-T G.8021, Characteristics of Ethernet transport network equipment functional blocks,
G.8121, Characteristics of Transport MPLS (T-MPLS) Equipment Functional Blocks, publication imminent
Etc.