Page 1260 - 5G Basics - Core Network Aspects

2 Transport aspects

For the case cm is not an integer, Cm(t) will vary between:

 f client B server 8 /   f client B server 8 / 


C m t) (  floor    and C m t) (  ceiling      (D-14)
f
f
 server M   server M 
The remainder of cn and Cm(t) is:
 8 M 
c nD  c n –  C m (t  ) (D-15)
 n 

As only an integer number of cnD n-bit data entities can be signalled per server frame or multiframe, the
integer value CnD(t) of cnD has to be used.



C nD (t )  int(c n )   8 M C m (t   )  C n (t )   8 M C m (t   ) (D-16)
 n   n 
8  M 8 M
CnD(t) is a number between 1 and  1 .
n n

16M-byte granularity mapping
Clause 20.5 specifies that the mapping of ODUk bits into the payload of an ODUCn.ts is performed with 128
 M-bit (16M-byte) granularity.
The insertion of ODUk data into the payload area of the ODTUCn.ts multiframe at the mapper is performed
in 16M-byte (or m-bit, m = 128  M) data entities, denoted as Cm(t). The remaining CnD(t) data entities are
signalled in the justification overhead as additional timing/phase information.
 cn   f B   f B   f B / 128 
c m   n    client  server      client  server    client  server   (D-20)



 m   f server m   f server 128 M   f server M 
As only an integer number of m-bit data entities can be transported per server frame or multiframe, the
integer value Cm(t) of cm has to be used. Since it is required that no information is lost, the rounding process
to the integer value has to take care of the truncated part, e.g., a cm with a value of 10.25 has to be
represented by the integer sequence 10,10,10,11.
 f B / 128 

C m t) (  int( c )  int  client  server   (D-21)
m
 f server M 
For the case cm is not an integer, Cm(t) will vary between:
 f B / 128   f B / 128 
C m t) (  floor   client  server  and C m t) (  ceiling   client  server   (D-22)

 f server M   f server M 
The remainder of cn and Cm(t) is:

128 M 
c nD  c n –  C m (t  ) (D-23)
 n 
As only an integer number of cnD n-bit data entities can be signalled per server frame or multiframe, the
integer value CnD(t) of cnD has to be used.


128 M  128 M 
C nD (t )  int(c n )   C m (t  )  C n (t )   C m (t  ) (D-24)
 n   n 
128  M 128M
CnD(t) is a number between 1 and  . 1
n n

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