SONET/SDH virtual tributary mapping to use KLM mode

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1

Hi,

Someone please help me understand, in the SONET/SDH virtual tributary
mapping context, K-L-M numbers are used to describe E1 positions.
What do the initials KLM stand for?

Regards,
kweheria

2

Hi

K describes TUG-3 group (1-3)
L describes a TUG-2 group inside a TUG-3 (1-7)
M describes a TU-12/VC12/E1 inside a TUG-2 (1-3)

I'm not sure if they actually have some meaning.

3

They are merely alphabetical indexes.

C

4

Thanks,

Always wondered what the motivation behind those exact letters was.