21 déc. 2012

Internet - Black-out : Que s’est-il réellement passe dans la nuit du 18 au 19 décembre ?

Le 18 décembre, à partir de 22h30 et 19 décembre 2012, l’ARTP a noté des perturbations sur les services Internet et les communications téléphoniques destinées à l’International de Sonatel.

La nature de l’incident et impacts :

Selon SONATEL, la nature de l’incident porte sur un dysfonctionnement survenu sur le câble sous-marins SAT3 causé par une contrainte sur le câble d’alimentation du premier répéteur au départ de la station d’atterrissement de câbles sous-marins (contact entre le câble électrique portant la télé alimentation du répéteur et l’eau).

Ce dysfonctionnement a causé une perte de 77% de la capacité Internet et 23% de la capacité des faisceaux internationaux, entraînant ainsi une forte perturbation du trafic Internet et du trafic voix destiné à l’International.

Actions réalisées par SONATEL :

– mise en place d’un comité de crise de très haut niveau ;
– investigations en collaboration avec des experts techniques pour déterminer les causes de l’incident ;
– diffusion de communiqués (journaux, radios) pour informer la clientèle ;
– basculement progressif du trafic vers les câbles sous-marins Atlantis II et ACE et également vers des câbles terrestres ;
– travaux en cours pour réparer le câble SAT 3 et rétablir la situation d’origine ;
– information en continue à l’ARTP sur l’état d’avancement des travaux.

Actions réalisées et mesures prises par l’ARTP :

– constat du dysfonctionnement et saisine de SONATEL pour l’obtention d’un premier niveau d’information sur le dommage et les causes ;
– instructions données à SONATEL de faire des communiqués pour informer sa clientèle ;
– lettre à SONATEL lui demandant de transmettre à l’Autorité, dans les meilleurs délais, un rapport d’incident sur le dysfonctionnement survenu ainsi que les mesures prises afin d’éviter à l’avenir de tels incidents ;
– suivi en permanence de l’état d’avancement des travaux pour un retour à la normale.
Situation dans la soirée du 20 décembre :

– capacités récupérées pour le moment :
o sur Internet : 6,3 Gigabits stabilisés à 100% ;
o sur les communications voix destinées à l’International : la totalité des circuits voix ;
o les capacités restantes (comparées au trafic sur l’Internet mondial qui est de 9,2 Gigabits/s) ont également été récupérées avec quelques instabilités.
– travaux réalisées par Sonatel et qui ont permis d’obtenir ces résultats :
o la restauration de capacité par un autre système de câbles Atlantis II qui atterrit également à Dakar ;
o la ‘mutation’ des liens vers le câble ACE ;
o le reroutage d’une bonne partie du trafic ;
o les actions de maintenance curatives sur la télé alimentation du câble SAT3.

Les prochaines étapes :

– il est attendu de Sonatel, la transmission d’un rapport complet à l’issue des travaux en cours pour le rétablissement des capacités initiales ;
– analyse du rapport par l’ARTP et prise des mesures appropriées ;
– proposition à l’Etat de solutions visant à éviter l’isolement total du pays en cas de problème sur les infrastructures d’un opérateur

Communique Artp

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