Protocol Label Switchng for Transport Networks MPLS-TP
standardisation is described on a separate page
and OTN standardisation is described on this page.
Concatenation VCAT has been developped to provide more
granularity in the transportable bandwidth of existing SDH
multiplexes. In stead of VC-12, VC-3 or VC-4 with VCAT also the total
payload of n x VC-12, n x VC-3 or n x VC-4 is available for the
transport of client signals. VCAT signals are commonly referred to as
The following standards bodies have Virtual Concatenation defined in the
ITU-T Recommendations G.707 / Y.1322 and G.783 define VC-4-Xv, VC-3-Xv, VC-2-Xv,
VC-12-Xv, VC-11-Xv for SDH.
For OTN Recommendation G.709 / Y.1331 defines ODUk-Xv and OPUk-Xv.
ETSI standard EN 300 417-9-1 defines VC-4-Xv, VC-3-Xv,
VC-2-Xv and VC-12-Xv with reference to the ITU-T recommendations.
ATIS - ANSI standard T1.105 defines STS-3c-Xv, STS-1-Xv, VT1.5-Xv
Capacity Adjustment Scheme LCAS has been developped to add
flexibility to Virtual Concatenation.
methodologies, the enablers of Next Generation Networks, are
referred to as DoS (Data over SDH/SONET) or EoS (Ethernet
Transport Networks from TDM to Packet.
This handbook is based on the content of
the Recommendations issued by the ITU-T on optical transport networks. It
is in particular devoted to synchronous digital hierarchy (SDH), optical
transport network (OTN) and Ethernet over transport (EoT)
Recommendations, technologies that are currently deployed in
telecommunication networks (I wrote Chapter 3: OAM in Transport
A Comprehensive Guide for Professionals
provides a single source reference of over a hundred standards and
industry technical specifications for optical networks at all levels
(I wrote Chapter 4: Multiplex structures of the Optical Transport