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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Like modern airlines, all the routine causes of breakdowns have largely been engineered away. 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.
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.
It is important to appreciate that the current software release the faulty one was eriicsson out very carefully as all upgrades normally areand it has been flawlessly for around five months until this fault developed.
RSS feed for comments on this post. The intention of writing this down is transparency — something we love. Some weeks are more complicated than others.
There was zero indication of the potential for ericssn to happen, until it started happening this week.
Digital subscriber line access multiplexer – Wikipedia
Retrieved from ” https: Like traditional voice-band modems, a DSLAM’s integrated DSL modems dslwm 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.
DSLAMs are also used by hotels, lodges, residential neighborhoods, and other businesses operating their own private telephone exchange. User traffic is mostly IP based. December Learn how and when to remove this template message. From Wikipedia, the free encyclopedia. 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 erjcsson specific bug had been fixed.
Nodes that have worked flawlessly for five months, so they might work flawlessly for another five months. 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 dslsm required to construct such digital interfaces are more costly. Posted in Broadband by Simon Hackett.
Ethernet DSL Access unlocks the broadband mass market
Sorry, the comment form is closed at this time. There is switch hardware, power control hardware, and a linux machine, all inside a small rack-mounted box. This modem functionality is integrated into the DSLAM itself instead of being done via an external device like a 20th-century voiceband modem. Thursday, April 1st, by Simon Hackett.
This article needs additional citations for verification. Views Read Edit View history. This sort of resiliency is at the heart of why these systems are generally just rock solid in practice.
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.
We obviously had a fault. Balanced pair cable has higher attenuation at higher frequencies.
Designing and Deploying Triple-Play Services. Last night we saw a few more switches not yet upgraded start to demonstrate ericssson fault. 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. 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 ddlam.
Digital subscriber line access multiplexer
Accordingly, through this ring architecture, if there is a loss of any single: 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.
Xslam been extremely fast and reliable.
Therefore, it cannot re-route traffic between multiple IP networks, only between ISP devices and end-user connection points. Each modem on the aggregation card communicates with a single subscriber’s DSL modem. So far, updating an ECN to that newer software release has resolved the issue on all customers attached to that affected ECN.
Please help improve this article by adding citations to reliable sources. The anatomy of a complex fault. In response we proactively upgraded another significant proportion of the switches in the entire SA network.
Each DSLAM has multiple aggregation cards, and each such card can have multiple ports to which the customers’ lines are connected. Once they caught a cold, they kept it. The only thing that has been demonstrated to stop the fault is to upgrade the ECN software to a newer release. Unsourced material may be challenged and removed.