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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Each modem on the aggregation card communicates with a single subscriber’s DSL modem. At that exit, those fibre links are attached to inter-exchange fibre paths, and overall what we construct in most cases is a wide-area ring.

Ok, so what happened? In response we proactively upgraded another significant proportion of the switches in the entire SA network. During reboot, the DSLAM modules maintain physical line sync to the customer, but obviously data flow stops. Multiplexing Digital subscriber line. December Learn how and when to remove this template message. It has been, and it remains, a very unusual failure mode, starting with this interesting fact — when things went wrong, rebooting the applicable parts of our equipment did not fix those network elements.

Therefore, it cannot re-route traffic between multiple IP networks, only between ISP devices and end-user connection points.

This page was last edited on 25 Octoberat The anatomy of a complex fault. But it is much more than that. The intention of writing this down is transparency — something we love.

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. Internode The Web Search Search. By using this site, you agree to the Terms of Use and Privacy Policy. Last night we saw a few more switches not yet upgraded start to demonstrate the fault. The following is a rough guide to the relation between wire distance based on 0. This sort of resiliency is at the heart of why these systems are generally just rock solid in practice.


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. Sorry, the comment form is closed at this time.

Ericsson EDN312X IP DSLAM Module

Archived from the original on This article needs additional citations for verification. RSS feed for comments on this post. Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer. Please help improve this article by adding citations to reliable sources.

Accordingly, through this ring architecture, if there is a loss of any single: DSLAMs are also used by hotels, lodges, residential neighborhoods, and other businesses operating their own private telephone exchange.

Its been extremely fast and reliable. A digital subscriber line access multiplexer DSLAMoften pronounced DEE-slam is a network device, often located in telephone exchangesthat connects multiple customer digital subscriber line DSL interfaces to a high-speed digital communications channel using multiplexing techniques.

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.

Ericsson EDNX IP DSLAM Module | eBay

Unsourced material may be challenged and removed. It is important to appreciate that the current software release 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.

The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to a erixsson release. Once they caught a cold, they kept it.

Balanced pair cable has higher attenuation at higher frequencies. 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. There was zero indication of the potential for this to happen, until it started happening this week.

Ethernet DSL Access unlocks the broadband mass market

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 is on Wikidata. Thursday, April 1st, by Simon Hackett. Posted in Broadband by Simon Hackett.

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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. Internode engineers a lot of redundancy and resiliency into its network services.

Some weeks are more complicated than others. What is left, therefore just like the airline situationare the truly unusual failure modes. As I write this, the network is back to operating in a normal and stable manner. 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.

In other projects Wikimedia Commons. So far, updating an ECN to that newer software release has resolved the issue on all customers attached to that affected ECN. 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 at the maximum possible connection rate.

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.