RE: Signal Type doubt in GMPLS

["manoj juneja" <manojkumarjuneja@hotmail.com>]

Hi Eric,

     Thanks for the reply. But I have still one thing not clear. When we 
request AUG-16, does this mean the whole STM-16 without
transparency ?
Similarly, In case of sonet, if signal type is one of STS-1 SPE, STS 
Group-3, STS Group-12, means whole STS-X without transparency. But if the 
requested signal type is one of STS-1 STS-3, STS-12 means with transparency 
?

Regards,
manoj.



>From: "Mannie, Eric" <Eric.Mannie@ebone.com>
>To: 'manoj juneja' <manojkumarjuneja@hotmail.com>, ccamp@ops.ietf.org
>Subject: RE: Signal Type doubt in GMPLS
>Date: Wed, 13 Jun 2001 10:04:40 +0200
>
>Hello Manoj,
>
> >Also, for signal types STM-1, STM-4 etc. it is written in braces
> >that "only when requesting transparency". What does this exactly mean ?
>
>When you request some transparency it means transparency in the SOH, so you
>don't just request some payload, you request something related to the frame
>itself. Some part of the SOH has to be delivered at the other end of the 
>LSP
>untouched. This can be achieved in several ways, e.g. simply forwarded
>untouched (and this doesn't require any new standard, e.g. you keep the DCC
>untouched and you forward it :-) by the intermediate nodes in the network,
>or tunnelled in some overhead bytes.
>
>We didn't want to use a VC type of signal with transparency because the SOH
>is not part of this VC, we used STM-N. This is much cleaner.
>
> >What does AUG-1/AUG-16 means ? STM-1 has 1 AUG and STM-N has N AUGs.
>
>An AUG-X signal type means the space taken by the AUG-X, it is like a TUG 
>or
>VTG signal. That allows to open a circuit without specifying its content,
>your SDH framer will recognise the content automatically.
>
>For instance, I am a customer and I don't care about transparency. I am
>connected to a switch with an STM-4 interface. I want to open a circuit 
>with
>the bandwidth equivalent of an STM-1 whose content can change, e.g. first I
>structure it as 3 x VC-3's, later on I want one VC-4. I request an AUG-1
>circuit.
>
>Kind regards,
>
>Eric
>
>-----Original Message-----
>From: manoj juneja [mailto:manojkumarjuneja@hotmail.com]
>Sent: Tuesday, June 12, 2001 9:31 PM
>To: ccamp@ops.ietf.org
>Subject: Signal Type doubt in GMPLS
>
>
>Hi,
>     I have certain doubts regarding signal type field in sonet-sdh 00.txt
>draft.
>
>What does AUG-1/AUG-16 means ? STM-1 has 1 AUG and STM-N has N AUGs.
>
>When signal type is AUG-256, what does this exatly mean ?
>
>Also, for signal types STM-1, STM-4 etc. it is written in braces
>that "only when requesting transparency". What does this exactly mean ?
>
>Please help.
>
>Regards,
>manoj.
>
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