https://www.cisco.com/c/en/us/tech/optical/synchronous-digital-hierarchy-sdh/index.html
Synchronous Digital Hierarchy (SDH) - Cisco
This page contains information about Synchronous Digital Hierarchy (SDH) technology.
https://en.wikipedia.org/wiki/Plesiochronous_digital_hierarchy
Plesiochronous digital hierarchy - Wikipedia
https://www.itu.int/rec/T-REC-G.8040-200312-S/_page.print
G.8040 : GFP frame mapping into Plesiochronous Digital Hierarchy (PDH)
https://www.cisco.com/c/en/us/tech/optical/synchronous-digital-hierarchy-sdh/tech-white-papers-list.html
Synchronous Digital Hierarchy (SDH) - Technology White Paper - Cisco
Synchronous Digital Hierarchy (SDH)-Some links below may open a new browser window to display the document you selected.
https://www.itu.int/rec/T-REC-G.8040/en
G.8040 : GFP frame mapping into Plesiochronous Digital Hierarchy (PDH)
https://www.itu.int/rec/T-REC-G.8040-200406-S/en
G.8040 : GFP frame mapping into plesiochronous digital hierarchy (PDH)
https://www.rfc-editor.org/rfc/rfc5143
RFC 5143: Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation...