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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Ericsson EDNX IP DSLAM Module | eBay

This sort of resiliency is at the heart of why these systems are generally just rock solid in practice. DSLAMs are also used by hotels, lodges, residential neighborhoods, and other businesses operating their own private telephone exchange. This has been a complicated 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.

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Its been extremely fast and reliable. Please help improve this article by adding citations to reliable sources. 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. 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.

Ok, so what happened? Therefore, it cannot re-route traffic between multiple IP networks, only between ISP devices and end-user connection points. Like modern airlines, all the routine causes of breakdowns have largely been engineered away. The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to a newer release. It has been, and it remains, a very rslam failure mode, starting with this interesting fact — when things went wrong, rebooting the applicable parts of our equipment did ericssoon fix those network elements.


Once they caught a cold, they kept it. The anatomy of a complex fault.

In response we proactively upgraded another significant proportion of the switches in the entire SA ericssn. 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.

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. User traffic is mostly IP based. 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.

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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. Xslam feed for comments on this post.

Last night we saw a few more switches not yet upgraded start to demonstrate the fault. Our vendor has subsequently identified a bug that is eicsson 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.

So far, updating an ECN to that newer software release has resolved the issue on all customers attached to eficsson affected ECN. A DSLAM may or 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.

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.


From Wikipedia, the free encyclopedia. In other projects Wikimedia Commons. During reboot, the DSLAM modules maintain eficsson line sync to the customer, but obviously data flow stops.

Balanced pair cable has higher attenuation at higher frequencies. Multiplexing Digital subscriber line. The following is a rough guide to the relation between wire distance based on 0. This compensation capability also takes advantage of the better performance of ” balanced line ” DSL connections, providing capabilities for LAN segments longer ericsso physically similar unshielded twisted pair UTP Ethernet connections, since the balanced line type is generally required for its hardware to function correctly.

This modem functionality is integrated into the DSLAM itself instead of being done via an external device like a 20th-century voiceband modem.

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

Nodes that have worked flawlessly for five months, so they might work flawlessly for another five months. Each modem on the aggregation card communicates with a single subscriber’s DSL modem. Views Read Edit View history.

As I write this, the network is back to operating in a normal and stable manner. There is switch hardware, power control hardware, and a linux machine, all inside a small rack-mounted box. 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. But it is much more than that.

Ethernet DSL Access unlocks the broadband mass market

An ECN looks like a 24 port ethernet network switch. Sorry, the comment form is closed at this time. 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 sdlam until this fault developed. Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer.