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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No Comments No comments yet. The anatomy of a complex fault.
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.
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.
In response we proactively upgraded another significant proportion of the switches in the entire SA network. This sort of resiliency is at the heart of why these systems are generally just rock solid in practice. Internode engineers a lot of redundancy and resiliency into its network services.
Thursday, April 1st, by Simon Hackett. But it is much more than that. Nodes that have worked flawlessly for five months, so they might work flawlessly egicsson another five months. There was zero indication of the ericszon for this to happen, until it started happening this week.
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.
Therefore, it cannot re-route traffic between multiple IP networks, only between ISP devices and end-user connection points. Ok, so what happened? 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.
Ethernet DSL Access unlocks the broadband mass market
From Wikipedia, the free encyclopedia. Multiplexing Digital subscriber line. 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. 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.
Ericsson EDN312X IP DSLAM Module
User traffic is mostly IP based. Balanced pair cable has higher attenuation at higher frequencies. Archived from the original on This is due to dspam nominal line impedance measured in Ohms but comprising both resistance and inductance of balanced lines being somewhat lower than that of UTP, thus supporting ‘weaker’ signals however the solid-state electronics required to construct such digital interfaces are more costly.
What is left, therefore just like the airline situationare the truly unusual failure modes. Views Read Edit View history. This article needs additional citations for verification. 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.
Accordingly, through this ring architecture, if there is a loss of any single: The failure mode resulted in some downstream 12 port DSLAM modules spontaneously rebooting, and after boot, those modules started complaining of being handed invalid configuration data and commenced another reboot and… so on.
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.
December Learn how and when to remove this template message. Internode The Web Search Search. Once they caught a cold, they kept it. Please help improve this article by adding citations to reliable sources.
Ericsson EDNX IP DSLAM Module | eBay
Retrieved from ” https: Posted in Broadband by Simon Hackett. The following is a rough guide to the relation between wire distance based on 0. During reboot, the DSLAM modules maintain physical line sync to the customer, but obviously data flow stops.
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. The intention of writing this down is transparency — something we love. Like modern airlines, all the routine causes of breakdowns have largely been engineered away.
This has been a complicated week! Some weeks are more complicated than others. Its been extremely fast and reliable.