AW: [T1X1.5] arbitrary contiguous concatenation question

[Heiles Juergen <Juergen.Heiles@icn.siemens.de>]

Maarten,

good point. Lets hear what the supporters of arbitrary concatenation have to say.

Juergen

> -----Ursprüngliche Nachricht-----
> Von: Maarten Vissers [mailto:mvissers@lucent.com]
> Gesendet: Dienstag, 10. Juli 2001 11:14
> An: ccamp
> Cc: t1x1.5; q11/15
> Betreff: [T1X1.5] arbitrary contiguous concatenation question
> 
> 
> All,
> 
> draft-ietf-ccamp-gmpls-sonet-sdh-01.txt defines signalling 
> support for arbitrary
> contiguous concatenation in appendix 3. Looking a bit more 
> into this arbitrary
> concatenation from the transport plane, I came across a 
> question with respect to
> the definition of "contiguous STS-1/AU-3 timeslots". Let me 
> introduce this
> question:
> 
> Figure 7-25/G.707 (10/2000) lists the AU-3 numbering (within 
> an STM-4) as
> follows
> 
>      Time          111
>      Slot 123456789012123456789
> 
> 	B 123412341234123412341...
> 	A 111122223333111122223...
> 
> AU-3 timeslots have a TimeSlot number and a (B,A) number, 
> with TS1 associated
> with (1,1) and TS12 associated with (4,3).
> 
> 	Note - the figure in the pre-published version of G.707
> 	doesn't show the timeslot numbering in a correct manner.
> 
> and the AU-4 numbering is as follows (figure 7-24/G.707)
> 
>      Time
>      Slot 123412341234123412341
> 
> 	B 123412341234123412341...
> 	A 000000000000000000000...
> 
> An AU-4 [STS-3c] is as such essentially a "non-contiguous" 
> concatenation of
> AU-3s [STS-1s]; i.e. every 4th AU-3/STS-1 is use; e.g. AU-4 
> (2,0) uses AU-3
> timeslots 2,6,10 [i.e. (2,1), (2,2), (2,3)].
> 
> 
> If we define STS-1 contiguous concatenation, which timeslots 
> are then used for
> e.g. a STS-1-3c:
> 	i)  timeslots (1,1),(2,1) and (3,1) [TS1,TS2,TS3], or
> 	ii) timeslots (1,1), (1,2) and (1,3) [TS1,TS5,TS9]
> 
> Similarly, for the case of a STS-1-6c do we use:
> 	i)  (1,1), (2,1), (3,1), (4,1), (1,2) and (2,2) 
> [TS1,TS2,TS3,TS4,TS5,TS6] or
> 	ii) (1,1), (2,1), (1,2), (2,2), (1,3) and (2,3) 
> [TS1,TS2,TS5,TS6,TS9,TS10]
> 
> 
> And which timeslots do we use for e.g. a STS-1-5c?
> 
> 
> If this detail is not specified, interworking is not possible 
> unless we include
> the list of timeslots as we do with virtual concatenation 
> (and as discussed for
> flexible arbitrary concatenation).
> 
> 
> Regards,
> 
> Maarten
>