Cell Relay Archive

[Paul Koning <pkoning@lucent.com>]

"Michael D. Todd" wrote:
> 
> This is a huge can of worms & probably has been
> discussed at length on this newsgroup.

It has been the subject of extensive work in the ATM
Forum, which set up a whole working group for it and
produced (if memory serves) two documents on the topic.

I'd recommend reading those.
 
> The advantages I see to using Native E.164 addresses are:
> 
> - customers are familiar with formats. AESA address
>   contain hex digits & I cannot imagine people not
>   hosing them up if they have to be entered by hand.
>   Of course, if you have some type of ANS (ATM naming
>   service) then you could enter atm.yourcompany.com.
> 
> - E.164 numbers would provide seamless interworking
>   with narrowband networks. However, I know of no one
>   implementing narrowband interworking with UNI 3.1.
>   Interworking could be provided (& must be provided
>   for voice/IP calls) in the narrowband network gateways.
>   Subaddressing could be used for broadband to PSTN
>   addressing.
> 
> The disadvantages to Native E.164:
> 
> - I have heard, from a fairly reliable source, that E.164s
>   are scarce & more expensive to obtain than AESA private
>   addresses.
> 
> - Some LAN protocols use the mac address embedded in the
>   AESA address to identify the end-user. It's doubtful
>   one will see these protocols on public access networks.

The bigger issue I can think of is that an E.164 address
by definition identifies a connection to a carrier.  If the
question is what addresses to use so you can give address
blocks to your customer, native addresses won't do because
the things the customer is identifying aren't E.164 endpoints.

Another question is: what routing mechanism do you want to
use inside your carrier network?  A number of carriers 
use PNNI for this purpose, which requires AESAs to be used.

> mars_chen wrote:
> >
> > Hi ,
> >
> > there are four ATM AESA Addressing format defined by ATM forum.
> > ICD, DCC, E.164, Local.
> >
> > if i am incumbent carrier want to provide ATm svc services, which
> > addressing scheme shall i use? How can i grant address authority?
> >
> > Any reply will be very appreciated.

If you're a carrier, E.164 may be the easiest to get.  If not,
go for DCD, those are definitely easy to get.  ICD isn't an
option anymore (the ATM Forum documents explain why).

Local AESA MUST NEVER be used in an application like this.
Best rule is NEVER to use it at all, it's pure and simple a
dangerous thing to use.  Failing that, use it ONLY in local
networks that are not connected to the outside world at all.

	paul

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