SAT3 Maintenance Notification - slow speeds and higher latency to be expected
Please note: All non-Restorable traffic as well as all Restorable on the Spurs to all the cable stations on the Southern SAT3 Segment excepting Accra and Abidjan, will be down for the duration of the power reconfiguration (4-6 Hours) from 00:01 UTC (02:01 SA Time) on the morning of 17 April 2010. In addition to the below communication from Global Capacity Business, the NNOC Plan Work communication process as used on previous such occasions is in the process of being implemented. Background You might recall that on 2nd February 2010 we had an approximately 2-hour loss traffic loss for both Restorable and non-Restorable traffic in the middle of the Normalisation process that was at the time in progress following the resolution of the problem on the Lagos Branching Unit (BU) off the coast of Nigeria. The cause behind the 2nd Feb failure was a faulty Abidjan (Ivory Coast) Power feeding Equipment (PFE) The Vendor (Alcatel-Lucent Submarine Networks - ASN), in conjunction with the relevant SAT3 Landing Parties have since repaired the PFE which must now be re-introduced into the SAT3 system. We have since the 2nd Feb PFE failure been feeding all power for the SAT3 Southern Segment (Melkbosstrand to Abidjan) from Melkbosstrand Cable Station which is a very risky situation as under such conditions the PFE redundancy status across the full SAT3 Southern Segment significantly reduced. We unfortunately had to wait for similar work on SMW3 (cable running between the Africa and Europe Continents to which we Restore SAT3 traffic), which activity only now gave the SAT3 Consortium the maintenance window being used below. It is of absolute importance that this be done now so we can establish/fix all problems currently existing on SAT3 prior to the FIFA event. Dear All As indicated below this is the very short notification in order to localise the fault on S3WS Southern Trunk. SMW3 granted us a window in order to perform the necessary work to determine where on the P3 segment is the problem. Below follow the sequence of events: 1. 15 &16 April 2010: Combined RET & Restoration implementation – Patching breaks to all restorable traffic on P3, except for festooning station traffic. Window: 0:01 UTC until completed . 2. 17 April 2010: Powering of ABJ PFE & Reconfigure BU i.e.: • Power down the trunk • Switch the BU • Powering up as follows: Dual end feed between MLK and ACC on the trunk. ABJ feed to the BU. • All NR traffic as well as all (R and NR) festooning traffic down for duration of the power reconfiguration (4-6 Hours): start 0:01 UTC on 17 April 2010. 3. 18 April 2010: Determine the location of the fault on the P3 trunk of S3WS and the next maintenance window. 4. 19 April 2010: Normalisation of restored traffic - Patching breaks to all restorable traffic on P3, except for festooning station traffic. Please note: For simplicity sake and to save some time, the restoration implementation for each step in the plan will be performed immediately after successful testing of the step. All cable station staff is required to be at the station for the whole duration of the restoration schedule and NOT just at the time their step is scheduled for. This is very important and will ensure that no time is wasted, since the ORCO will move to the next step in the plan if station staff is not available or cannot be contacted. Attached are the following documents: 1. Restoration (and testing) schedule to restore all P3 traffic, excluding festooning stations. 2. List of TSA NR and festooning traffic on P3, which will be down for the duration of P3 trunk powering exercises. 3. Complete list of TSA Traffic on P3 segment. 4. P3 URM Plan dated 26 February 2010. Sorry for the short notification period, but this planned work is critical and we only have a narrow window to perform it in. SA Time = UTC Time + 2 Hours