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What is Tributary Unit (Group) : TU (TUG) in sdh?

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What is Tributary Unit (Group) : TU (TUG) in sdh?
asked Jul 30, 2012 in Transmission Technologies by confused-guy (50,290 points)
    

1 Answer

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 Tributary Unit
A  tributary  unit  is  a  information  structure  which  provides  adaptation
between the lower order path layer and the higher order path layer. It consists of
a information pay load (lower order virtual container) and a tributary unit pointer    
which indicates the offset of the pay load frame start relating to the higher order
VC  frame  start.  Tributary  unit  1  for  VC-1  and  Tributary  unit  2  is  for  VC-2  and
Tributary unit 3 is for VC-3, when it is mapped for VC-4 through tributary group-
3. TU-3 pointer consists of 3 bytes out of 9 bytes. Three bytes are H1, H2, H3
and remaining bytes are fixed bytes. TU-1 pointers are one byte interleaved in
the TUG-2.

Tributary Unit Group
One  or  more  tributaries  are  contained  in  tributary  unit  group.  A  TUG-2
consist of homogenous assembly of identical TU-1s or TU-2. TUG-3 consists of
a homogenous assembly of TUG-2s or TU-3. TUG-2 consists of 3 TU-12s (For
2.048 Mbit/sec). TUG-3 consists of either 7 TUG-2 or one TU-3.

answered Aug 6, 2012 by bbiswajit88ece (100,930 points)

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