Dear All,
some vendors use NSAP for accessing the SDH nodes. some use TCP/IP.
some vendors use subnet mask for accessing the nodes.
My query is weather the accessing is been specified by ITU ?
And what are the other ways to access the SDH node....

Hello Saji,

You wrote:

> some vendors use NSAP for accessing the SDH nodes. some use TCP/IP.
> some vendors use subnet mask for accessing the nodes.

Good observation.

> My query is weather the accessing is been specified by ITU ?

No the access is not specified (nor recommended).

> And what are the other ways to access the SDH node....

There is ASON that is specified to manage transport networks
(SDH, OTN, PTN). See G.77xx series of recommendations.


Cheers, Huub.

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What is NSAP and what does this mean and is it significant??

On Dec 16, 5:45=A0pm, saji <pradeepsnay...@gmail.com> wrote:
> What is NSAP and what does this mean and is it significant??

NSAP means Network Service Access Point. It's an OSI term.
When an OSI stack is used, the network element is accessed through an
NSAP address,
like when a TCP/IP stack is used, the network element is accessed
through an IP address.

Regards,
Bert Klaps

Bonjour Bert,

Happy to see you!

Could I use the occasion of the bus! it's snowing in Paris this
morning...

When it is a TCP/IP stack, is it IP over PPP (over Dn) that is
commonly used?

So we would have, e.g. SNMP > UDP > IP > PPP > Dn.

Best regards,
Michelot

Thank you for the reply, Usually which one is used TCP or UDP for SDH
communication??
Does NSAP have significance when TCP is being used?

Hello Saji,

You wrote:

> Thank you for the reply, Usually which one is used TCP or UDP for SDH
> communication??

TCP, because delivery of packets is more reliable.
UDP is best effort.

> Does NSAP have significance when TCP is being used?

Yes. It is like the address on a postcard, very necessary
if you want to make sure that the postcard is received by
the person you want to send it to.

Regards, Huub.

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> > Thank you for the reply, Usually which one is used TCP or UDP for SDH
> > communication??
> 
> TCP, because delivery of packets is more reliable.
> UDP is best effort.
> 
> > Does NSAP have significance when TCP is being used?
> 
> Yes. It is like the address on a postcard, very necessary
> if you want to make sure that the postcard is received by
> the person you want to send it to.

However, it should be pointed out that TCP doesn't really know anything
about NSAP - while IS-IS, for instance, does.

The only addresses that TCP knows about are IP addresses...

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

Hej Steinar,

Your reply:

> However, it should be pointed out that TCP doesn't really know anything
> about NSAP - while IS-IS, for instance, does.

Is correct.
In general SDH networks are managed by OSI services, which
use IS-IS.

> The only addresses that TCP knows about are IP addresses...

Indeed, and if the OSI service runs over TCP/IP the
IP address is converted in an NSAP address for the OSI layer.

Best regards, Huub.

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