Chronique de câblages


I had a fun tech support call the other day that I think you will find interesting. A customer sent one of the ugliest traces we had seen in a while. “Help! What is going on here?” This came with the usual, it is urgent, his boss will kill him, the network is down, and he saw a dog and a cat making friendly on the way home from the job site.

Send us the trace file, better, please send it to us in the native, .flw, format. There is a lot of information in there that is very helpful to us, such as, what tester you are using, what firmware it has, and, what the failure is.


The condition and characteristics of fiber optic connectors greatly affects the performance of an installed fiber optic link. High connector loss (e.g., insertion loss), low return loss, or high reflectance will impair an application (i.e. 10GBASE-LRM) from running on a network. A high return loss is a good thing and usually results in low insertion loss. Let’s examine the differences between these three terms because they can be confusing.


Fiber to the Desk (FTTD) applications have long been lumped in with other FTTX applications with the “X” signifying a variety of fiber optic access points, including Fiber to the Home (FTTH), Fiber to the Premise (FTTP), Fiber to the Curb (FTTC) and Fiber to the Building (FTTB). But it’s important to remember that FTTD is a premise application while many of the others are considered outside plant.


Regardless of the size and type of the data center, the switching topology and the applications, the underlying cabling infrastructure that creates all the links needed to connect data center equipment follows the same basic design principles established by industry standards. These standards were developed on the basis that regardless of business activity or size, all data centers have similar needs that include providing secure, uninterrupted availability, performance and reliability.


While the number of hyperscale data centers in the world is only estimated at around 300, with half of these belonging to U.S.-based companies (Think Amazon, Google, Microsoft, Facebook, Ebay and Twitter) and another 100 hyperscale data centers expected by the end of 2018, we are constantly hearing rumbles about these unique spaces.

Plus, hyperscales tend to be key drivers behind data center technologies, trends and applications—not to mention standards development. Would the IEEE really be working on 400 Gig if it weren’t for these giants?



Nous savons tous que des extrémités de connecteur de fibre optique encrassées peuvent provoquer un affaiblissement du signal et une réflexion, ce qui explique pourquoi elles doivent être nettoyées et contrôlées avant de procéder au raccordement final. Mais que se passera-t-il si l’on nettoie correctement l’extrémité de la fibre optique et si l’on vérifie qu’elle est exempte de toute contamination, si on la teste à l’aide du FI-7000 FiberInspector Pro et que le connecteur n’est toujours pas acceptable ? Peut-être, je dis bien peut-être, vous disposez d’une extrémité de connecteur qui ne respecte pas les paramètres en matière de géométrie d’extrémité.

Ni trop élevé, ni trop bas


Equipment cords are an integral part of any network—whether it’s a fiber jumper used to make connections between fiber patching areas and switches in the data center or a copper patch cord out in the LAN to connect end devices to the work area outlet.


Si des faisceaux de câbles bien démêlés peuvent effectivement avoir une belle apparence dans les chemins pour câbles aériens exposés et dans les étagères et armoires, ce déploiement esthétiquement agréable n’est pas toujours exemplaire lorsqu’il s’agit des performances.

Parfois, cela peut être difficile à expliquer à vos clients qui semblent prêter attention plus à l’apparence des câbles qu’à l’efficacité avec laquelle ils transmettent leurs données.

Il vaut mieux garder certaines choses naturelles


Fluke Networks has long provided educational content on anything and everything to do with testing network cabling systems—from standards and best practices, to application assurance and tricks of the trade.


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