Ericsson is this week re-entering the market for DSLAMs with an innovative Ethernet access card that it says will unlock the mass market for DSL services by . DSLAM units are typically located in telephone exchanges or distribution points. They allow for the high-speed transmission of DSL technology. Ericsson’s EDA solution is the most widely deployed IP/Ethernet DSLAM with over 60 contracts globally, utilizing the latest ADSL2+ technology.

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It also uses the best equipment and services it can obtain — because this is all a part of giving our customers the best possible service experience.

Thursday, April 1st, by Simon Hackett.

From Wikipedia, the free encyclopedia. Internode engineers a lot of redundancy and resiliency into its network services.

Ericsson EDNX IP DSLAM Module | eBay

This compensation capability also takes advantage of the better performance of ” balanced line ” DSL connections, providing capabilities for LAN segments longer than physically similar unshielded twisted pair UTP Ethernet connections, since the balanced line type is generally required for its hardware to function correctly.

Archived from the original on This is not a trivial decision, because we are upgrading to a new software release — which brings in the potential for there to be some other, as yet unknown, issue for our service. The following is a rough guide to the relation between wire distance based on 0.

Ok, so what happened?

Please help improve this article by adding citations to reliable sources. Each DSLAM has multiple aggregation cards, and each such card can have multiple ports to which the customers’ lines are connected.

User traffic is mostly IP based.

Ethernet DSL Access unlocks the broadband mass market

Like traditional voice-band modems, a DSLAM’s integrated DSL modems are usually able to probe the line and to adjust themselves to electronically or digitally compensate for forward echoes and other bandwidth-limiting factors in order to move data dsoam the maximum possible connection rate. Articles needing additional references from December All articles needing additional references All articles with unsourced statements Articles with unsourced statements from December Commons category link eericsson on Wikidata.


Internode The Web Search Search. The intention ericssob writing this down is transparency — something we love. Therefore, it cannot re-route traffic between multiple IP networks, only between Dslan devices and end-user connection points. They are boot servers, control nodes, statistical aggregation points, and a number of other things including, also, being the ethernet switches that they appear, at face value, to be. Multiplexing Digital subscriber line. Designing and Deploying Triple-Play Services.

Its been extremely fast and reliable. Accordingly, through this ring architecture, if there is a loss of eficsson single: What is left, therefore just like the airline situationare the truly unusual failure modes.

But it is much more than that. Customer-premises equipment that interfaces well with the DSLAM to which it is connected may take advantage of enhanced telephone voice and data line signaling features and the bandwidth monitoring and compensation capabilities it supports.

This has been a complicated week! Based on vendor advice, we are now looking at how best to upgrade the rest of the network, to guard against a further recurrence elsewhere. As I write this, the network is back to operating in a normal and stable manner.

December Learn how and when to remove this template message. Last night we saw a few more switches not yet upgraded start to demonstrate the fault. The current theory, based on vendor feedback, is that the software fault is a latent, load triggered, memory leak that makes the ECN lose the plot in a manner that corrupts some critical item inside one of the ECN systems — an item that remains corrupted after it is rebooted or power cycled.

The DSLAM equipment collects the data from its many modem ports and aggregates their voice and data traffic into one complex composite “signal” via multiplexing.


The failure mode resulted in some downstream 12 port DSLAM modules spontaneously rebooting, and after boot, those modules started complaining of being fricsson invalid configuration data and commenced another reboot and… so on. The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to ericssson newer release. This modem functionality is integrated into the DSLAM itself instead of being done via an external device like a 20th-century voiceband modem.

So far, updating an ECN to that newer software release has resolved the issue on all customers attached to that affected ECN. Posted in Broadband by Simon Hackett. Some weeks are more complicated than others. RSS feed for comments on this post. Our vendor has subsequently identified a bug that is consistent with our observed outcome, and on their advice, we upgraded to the next revision of the code concerned in which that specific bug had been fixed.

It is important to appreciate that the current software dslm the faulty one was rolled out very carefully as all upgrades normally areand it has been flawlessly for around five months until this fault developed.

But because it was a truly unusual failure mode, and also just because we care a hell of a lot about such things, we dropped everything to resolve it. The anatomy of a complex fault. We obviously erivsson a fault. This page was last edited on 25 Octoberat By using this site, you agree to the Terms of Use and Privacy Policy. Like modern airlines, all the routine causes of breakdowns dsam largely been engineered away.

A DSLAM may or may not delam located in the telephone exchange, and may also serve multiple data and voice customers within a neighborhood serving area interfacesometimes in conjunction with a digital loop carrier.