Telstra has revealed the addition of almost one million new mobile services in the six months to December 2011, but Sensis revenues plummeted 24 percent in 12 months.
Paul Brooks of Layer 10 Consulting, who worked consulting to Internode on getting Annex M accepted by ACIF, said at the time that he believed uplink speeds of 2.8 to 3Mbps should be achievable close to an exchange and speeds of around 2Mbps at distances up to 1.5kms.
He said that the process of gaining approval for Annex M had required extensive modelling of its performance over various cable lengths to assess potential interference with other ADSL services.
Final approval of the standard by ACIF will enable any DSLAM operator of offer Annex M. However Brooks warned that this was far more challenging than deploying Annex A: a unique feature of Annex M is that there are several operating modes and each service must be manually configured on the DSLAM according to the length and other characteristics of the line over which it is delivered.
This would make it unlikely that Annex M services will be aimed at the consumer market. However they could well offer noticeable advantages over ADSL2+, even for web browsing.
Hackett explained to iTWire earlier this week - commenting on Telstra's new ADSL2+ service, which limits upstream to 384kbps outside metro areas - how upstream speed limitations could result in the full downstream bandwidth being unutilised.
In any IP data transfer acknowledgement packets are sent from the receiving end and, in the case of a web page made up of many small files, the amount of such traffic can be a significant percentage of downstream traffic, 100 percent in extreme cases but around 15 percent is not uncommon, according to Hackett. This would effectively throttle downstream bandwidth to six times upstream or, in the worst case no more than upstream bandwidth when accessing web pages.
So an ADSL2+ service operating at full capacity of 24M/1M might not download a web page any faster than 6Mbps.
The new standard, ACIF C559:200 is available here.
David Bass
| For the fourth year in a row, IDC has placed content security provider Websense (NASDAQ: WBSN) at the top of the IDC Worldwide Web Security 2011 –…
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