Re: [PWE3] New draft - Efficient Multiplexing of ISDN User-Network Interfaces over TDM Pseudo-wires

Giles,

I agree that a lot of the rationale behind pulling individual channels out of TDM to save the silence time has gone away.

However, I can think of a few use cases for AAL2 (and I am interested in hearing what Javi has to say).

The obvious case is satellite links. Here BW is still expensive, but it may be the only way to get to out-of-the-way places.

The other is the case of many ISDN channels on a link towards a network where they will be converted to VoIP flows.
Here the overhead of sending each VoIP flow together on the link may be prohibitive.
There are other solutions to this problem (e.g., RFC 4170), but using AAL2 may be a practical way of solving this problem.

Y(J)S

From: pwe3-bounces@ietf.org [mailto:pwe3-bounces@ietf.org] On Behalf Of Giles Heron
Sent: Friday, January 11, 2013 19:41
To: Javi Muñoz
Cc: pwe3@ietf.org
Subject: Re: [PWE3] New draft - Efficient Multiplexing of ISDN User-Network Interfaces over TDM Pseudo-wires

Hi Javi,

your link below doesn't work.  It links to https://tools.ietf.org/html/draft-jiang-l2vpn-vpls-pe-etree-00 instead of to http://tools.ietf.org/html/draft-munozcalle-pwe3-multiplexing-isdn-interfaces-00.

oh the dangers of HTML-formatted email ;)

with respect to the draft itself do you have a real use-case or is the draft more of an intellectual exercise?  For example, given that we're in 2013 and bandwidth is generally pretty cheap, the benefit of using AAL2 to carry in-use channels only would seem to be minimal unless you are leasing TDM circuits to reach the remote gateway (in which case a TDM-based solution might be simpler than TDM over packet over TDM).

Giles

On 11 Jan 2013, at 13:23, Javi Muñoz <javi@trajano.us.es<mailto:javi@trajano.us.es>> wrote:

Hi experts in PWE3 WG,

I just submitted a new draft "Efficient Multiplexing of ISDN User-Network Interfaces over TDM Pseudo-wires".

In this document, we propose a mechanism to efficiently multiplex a number of ISDN interfaces over a single TDMPW. This mechanism would allow a single Access Gateway to remotely terminate a high number of distant local loops.

This draft can be accessed by the following link:

http://tools.ietf.org/html/draft-munozcalle-pwe3-multiplexing-isdn-interfaces-00<http://tools.ietf.org/html/draft-jiang-l2vpn-vpls-pe-etree-00>
Your comments and suggestions are greatly appreciated.

Best regards

Javi
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