ITU-T Recommendation G.7043 "Virtual concatenation of plesiochronous digital hierarchy (PDH) signals" enhances the frame structures of PDH signals of 1544, 2048 and 44 736 kbit/s, as defined in ITU-T Recommendation G.704, and the octet structured 34 368 kbit/s, as defined in ITU-T Recommendation G.832 to support virtual concatenation.
Specifically, frame structures of the same type may be virtually concatenated together to form larger transport entities (containers).
This virtual concatenation supports the Link Capacity Adjustment Scheme (LCAS) specified in ITU-T Recommendation G.7042/Y.1305.
References
G.7043 Wikipedia(Text) CC BY-SA