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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But it is much more than that. Balanced pair cable has higher attenuation at higher frequencies. Each modem on the aggregation card communicates with a single subscriber’s DSL modem. Nodes that have worked flawlessly for five months, so they might work flawlessly for another five months. 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.

Sorry, the comment form is closed at this time. 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. In response we proactively upgraded another significant proportion of the switches in the entire SA network. The intention of writing this down is transparency — something we love.


DSLAMs are also used by hotels, lodges, residential neighborhoods, and other businesses operating their own private telephone exchange. This article needs additional citations for verification.

Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer.

Ericsson IP DSLAM EDNXP | DTC Product Gallery | Pinterest | Spare parts and Management

This has been a complicated week! Dslaj 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. Like modern airlines, all the routine causes of breakdowns have largely been engineered away. What is left, therefore just like the airline situationare the truly unusual failure modes. From Wikipedia, the free encyclopedia. Archived from the original on This modem functionality is integrated into the DSLAM itself instead of being done via an external device like a 20th-century voiceband modem.

Thursday, April 1st, by Simon Hackett. An ECN looks like a 24 port ethernet network switch. RSS feed for comments on this post.

User traffic is mostly IP based. 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. Some weeks are more complicated than others.

Ericsson EDN312X IP DSLAM Module

Once they caught a cold, they kept it. Retrieved from ” delam 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. 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. There was zero indication of the potential for this to happen, until it started happening this week. This sort of resiliency is at the heart of why these systems are generally just rock solid in practice.

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

Digital subscriber line access multiplexer

Ok, so what happened? During reboot, the DSLAM modules ericssln physical line sync to the customer, but obviously data flow stops. The following is a rough guide to the relation between wire distance based on 0.

So far, updating an ECN to that newer software release has resolved the issue on all customers attached to that affected ECN. Each DSLAM has multiple aggregation cards, and each such card can have multiple ports to which the customers’ lines are connected.