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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Once they caught a cold, they kept it. Accordingly, through this ring architecture, if there is a loss of any single: Sorry, the comment form is closed at this time. It has been, and it remains, a very unusual failure mode, starting with this interesting fact — when things went wrong, rebooting the applicable parts ericsspn our equipment did not fix those network elements.

The following is a rough guide to the relation between wire distance based on 0.

Therefore, it cannot re-route traffic between multiple IP networks, only between ISP devices and end-user connection points. Please help improve this article by adding citations to reliable sources.

No Comments No comments yet. 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.

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Thursday, April 1st, by Simon Hackett. We obviously had a fault. Some weeks are more complicated than others.

Ethernet DSL Access unlocks the broadband mass market

Last night we saw a few more switches not yet upgraded start to demonstrate the fault. 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. Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer.


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

Internode engineers a lot of redundancy and resiliency into its network services. During reboot, the DSLAM modules maintain physical line sync to the customer, but obviously data flow stops. 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.

Internode Blog » The anatomy of a complex fault

Customer-premises equipment that interfaces well with the Sslam 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. Ok, so what happened?

This sort of resiliency is at the heart of why these systems are generally just rock solid in practice.

Retrieved from ” https: There is switch hardware, power control hardware, and a linux machine, all inside a small rack-mounted box. This page was sricsson edited on 25 Octoberat 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.

From Wikipedia, the free encyclopedia.

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

This has been a complicated week! This is due to the nominal line impedance measured in Ohms but comprising both resistance and inductance of balanced lines being somewhat lower than that of Dslm, thus supporting ‘weaker’ signals however the solid-state electronics required to construct such digital interfaces are more costly.


The anatomy of a complex fault. Each modem on the aggregation card communicates with a single subscriber’s DSL modem. The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to a newer release.

Posted in Broadband by Simon Hackett. A DSLAM may eericsson may not be 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. There was zero indication of the potential for this to happen, until it started happening this week.

Designing and Deploying Triple-Play Services. 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.

Ericsson EDN312X IP DSLAM Module

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.

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. This article needs additional citations for verification. By using this site, you agree to the Terms of Use and Privacy Policy. 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.

But it is much more than that. Multiplexing Digital subscriber line.