1. GSC-8-161 18/07/2015GSC-8, OTTAWA Ken Biholar T1X1 Chairman Wayne Zeuch T1 Vice Chairman Committee T1 Work on Digital Hierarchies

2. 18 July 2015GSC-8, OTTAWASlide 2 Optical Transport Networks T1X1 addresses: –Optical Transport Networks (OTN) –Synchronous Optical Networks (SONET) SONET standards are in a mature state, efforts this past year focused on incorporation of Virtual Concatenation and Link Capacity Adjustment Scheme (LCAS) for Virtual Concatenated Signals into the existing T1 and ITU-T standards. A major focus of the work efforts in 2002 was the submission of contributions to Recommendations being developed in ITU-T Study Group 15 Digital Hierarchies

3. 18 July 2015GSC-8, OTTAWASlide 3 Optical Transport Networks Link Capacity Adjustment Scheme (LCAS) –Supports Virtual Concatenation (T1.105 Addendum approved in 2002) Payload Mappings; T1.105.02 Addendum on GFP –mapping of GFP signals into payloads (also included in ITU-T SG 15 Recommendations) Physical Layer Specifications –T1.105.06 Revisions incorporated short-reach interface requirements (completed in 2002) SONET (Synchronous Optical Networks) – T1.105

4. 18 July 2015GSC-8, OTTAWASlide 4 Optical Transport Networks Network Element Timing and Synchronization: –T1.105.03 Revision in 2002 describes jitter specifications that are applicable to SONET optical signals (OC-N) and SONET payload signals (i.e., DS1 and DS3). Automatic Optical Switched Networks (ASON): –60 contributions in 2002 to the ITU-T work on ASON SONET (Synchronous Optical Networks)

5. 18 July 2015GSC-8, OTTAWASlide 5 Optical Transport Networks Technical Reports –Synchronization Network Architecture: balloted in 2002 (published soon) provides concepts and techniques for synchronization architectures for use in digital communication networks –Synchronization on Packet Networks: work began in 2002 will document synchronization conditions in an environment involving hybrid (packet /TDM) networks SONET (Synchronous Optical Networks)

6. 18 July 2015GSC-8, OTTAWASlide 6 Optical Transport Networks T1.105-2001 - Synchronous Optical Network (SONET) - Basic Description including Multiplex Structure, Rates, and Formats (Revision of T1.105-1995; includes Supplement T1.105a-2002 – published in 2002) T1.105.02-2001 - Synchronous Optical Network (SONET) - Payload Mappings (Revision of T1.105.02-1995; includes Supplement T1.105.02a-2002- published in 2002) T1.105.05-2002 - Synchronous Optical Network (SONET): Tandem Connection Maintenance (Revision of T1.105.05-1994) T1.105.08-2001 - Synchronous Optical Network (SONET) - In- band Forward Error Correction Code Specification (published in 2002) T1.105.09-1996 (R2002) – Synchronous Optical Network (SONET) – Network Timing and Synchronization (Reaffirmation of T1.105.09-1996) References