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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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.
Ethernet DSL Access unlocks the broadband mass market
Please help improve this article by adding citations to reliable sources. In response we proactively upgraded another significant proportion of the switches in the entire SA network. 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. Internode engineers a lot of redundancy and resiliency into its network services.
The following is a rough guide to the relation between wire distance based on 0. Typically a single DSLAM aggregation card has 24 ports, but this number can vary with each manufacturer. Ok, so what happened? This article needs additional citations for verification.
InterComms – The International Communications Project
This has been a complicated week! Posted in Broadband by Simon Hackett. Each DSLAM has multiple aggregation cards, and each such card can have multiple ports to which the customers’ lines are connected.
This modem functionality is integrated into the DSLAM itself instead of being done via an external device like a 20th-century voiceband modem. There is switch hardware, power control hardware, and a linux machine, all inside a small rack-mounted box.
Reicsson I erixsson this, the network is back to operating in a normal and stable manner. This page was last edited on 25 Octoberat This sort of resiliency is at the heart of why these systems are generally just rock solid in practice.
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. Views Ericssln Edit View history. Articles erkcsson 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.
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Each modem on the aggregation card communicates with a single subscriber’s DSL modem. Its been extremely fast and reliable. Last night we saw a few more switches not yet upgraded start to demonstrate the fault.
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 erricsson its hardware to function correctly. Unsourced material may be challenged and removed. The anatomy of a complex fault.
From Wikipedia, the free encyclopedia. In other projects Wikimedia Commons. Retrieved from ” https: Archived from the original on 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. There was zero indication of the potential for this to happen, until it started happening this week.
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. 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.
RSS feed for comments on this post. 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. Balanced pair cable has higher attenuation at higher frequencies.
Nodes that have worked flawlessly for five months, so they might work flawlessly for another five months. The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to a newer release. Thursday, April 1st, by Simon Hackett. 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.
DSLAMs are also used by hotels, lodges, residential neighborhoods, and other businesses operating their own private telephone exchange. 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 other, as yet unknown, issue for our service.
Accordingly, through this ring architecture, if there is a loss of any single: 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. 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 ericsskn for forward echoes and other bandwidth-limiting factors in order to move data at the maximum possible connection rate.