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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The wricsson of writing this down is transparency — something we love. 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. RSS feed for comments on this post. 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 anatomy of a complex fault.

InterComms – The International Communications Project

Its been extremely fast and reliable. 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 dalam function correctly.

We obviously had a fault. User traffic is mostly IP based. The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to a newer release. But it is much more than that. Internode The Web Search Search. Like modern airlines, all the routine causes of breakdowns have largely been engineered away. 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.


Last night we saw a few more switches not yet upgraded start to demonstrate the fault.

Digital subscriber line access multiplexer

Therefore, it cannot re-route traffic between multiple IP networks, only between ISP devices and end-user connection points. What is left, therefore just like the airline situationare the truly unusual failure modes.

Each DSLAM has multiple aggregation cards, and each such card can have multiple ports to which the customers’ lines are connected. Some weeks are more complicated than others.

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.

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.

Please help improve this article by adding citations to reliable sources. Posted in Broadband by Simon Hackett.

Multiplexing Digital subscriber line. Views Read Edit View history. This sort of resiliency is at the heart of why these systems are generally just rock solid in practice. From Ericcsson, the free encyclopedia.

An ECN looks like a 24 port ethernet network switch. Unsourced material may be challenged and removed. This has been a complicated week! It also uses the best equipment and services it can obtain — because this fricsson all a part of giving our customers the best possible service experience.

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Ericsson EDN312X IP DSLAM Module

During reboot, the DSLAM modules maintain physical line sync to the customer, but obviously data flow stops. Nodes that have worked flawlessly for five months, so they might work flawlessly for another five months. By using this site, you agree to the Ericssonn of Use and Privacy Policy.

Internode engineers a lot of redundancy and resiliency into its network services. 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. Sorry, the comment form is closed at this time.

Digital subscriber line access multiplexer – Wikipedia

Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer. Once they caught a cold, they kept it.

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 ericssoon, as yet unknown, issue for our service.

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 UTP, thus supporting ‘weaker’ signals however the solid-state electronics required to construct such digital interfaces are more costly. This page was last edited on 25 Octoberat In response we proactively upgraded another significant proportion of the switches in the entire SA network.

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.