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Comments on NBN Wholesale Service Definition Framework- Ethernet
Contents
1 Introduction 3
1.1 General comments 3
1 Introduction
Motorola is pleased to respond to Communications Alliance’s request for comments on the document titled “National Broadband Network Wholesale Service Definition Framework - Ethernet” which was issued in November 2009.
The following general comments are provided.
1.1 General comments
The NBN Wholesale Services working group has made a good attempt at producing an initial draft of the Wholesale Service Definition Framework.
The framework in its current form is very high level and too abstract to visualise or draw upon meaningful conclusions of how the various wholesale scenarios may play out. We suggest including various scenarios of wholesale models and provide definitive service scenarios for each of the model.
Similarly, ELAS is defined at a very high level. It would be useful to describe how the various common end-user services (e.g.VoIP, High Speed Data, VoD, Multi-cast video) and future Ethernet applications / services will be carried over the ELAS and how the obligations of the BAP to ASPs / CSPs will be honoured in the Wholesale Services Framework.
While the roles of the BAP, BIP, BBP, WSA etc are described their relationship among themselves and to the ASPs / CSPs is unclear. We suggest including a table / matrix that shows who buys what services from whom.
The Broadband Forum’s TR-101 is cited as reference to the ethernet aggregation model. While TR-101 is still relevant, we suggest the use of TR-156 in the context of the NGN. TR-101 has its relevance is DSL where the DSL modem is treated as a customer premises equipment with ‘U’ interface on the network side, whereas the ONT / ONU is a network equipment in a PON network with ‘U’ interface on customer side.
While the Wholesale Services working group seems to prefer 1:1 VLAN double tagged architecture, the N:1 model cannot be ignored.
Although, VLAN has been described as a way to isolate traffic, there is should be additional coverage on how the wholesale services will be secured in the network with respect to service isolation, service provider isolation, trusted service, un-trusted service (requiring VLAN / p-bit translations), prevention mechanism for direct user-to-user traffic, access control etc.
In section 6.1.2 (End-user premises Physical interfaces), considerations should be given for RF overlay, E1 and other interfaces and how the various ASP/CSP services will be carried over the NBN network and these interfaces. This would align this document with the requirements being developed in “End User Premises work group”. We recommend that the ‘NBN Reference Architecture specifications” also is consistent with the specifications for end user premises.
4 December 2009 / © Motorola 2009Page 2 of 3