I wouldn't say bad design, I would say outdated design. How do you take a single fiber optic cable or a copper cable bundle going to a business/building or a house and terminate it at 2 different Central Offices? It inherently has a single points of failure. (why I added extra straps to my fiber outside at home because stupid wind blows the damn cable around that goes to the pole, I'm in NJ everything on poles here)
I don't think a bomb going off was part of the redundancy design process when telephone central offices were first starting to be built. I heard the rumour is (perhaps fact) the generators were keeping everything up till about 12-1 PM eastern when they shut the gas supply off to the neighborhood earlier safety. Once the batteries drained, that was it. Family I have in Nashville were on the phone when it cut out and then everything went dark. I do think they could have done a better job with the wireless infra. No reason you can't have some cell sites that can feed to a different central office. The fact is, distributed systems could work better, many smaller switching and distribution buildings scattered about a metro area with redundant links. A mesh. That was the single point of failure is just the link from your house to the next hop. Obviously not feasible with copper pairs. - Javier On Thu, Jan 14, 2021 at 10:05 AM Hiers, David <[email protected]> wrote: > No doubt they’re good, but the best support can’t overcome bad design. > > > > > > > > *From:* NANOG <[email protected]> *On Behalf Of > *Robert DeVita > *Sent:* Tuesday, December 29, 2020 5:17 PM > *To:* Eric Kuhnke <[email protected]>; Sean Donelan <[email protected]> > *Cc:* NANOG <[email protected]> > *Subject:* Re: Nashville > > > > AT&T Disaster Recovery Team is probably the best in the business. The > resources they can bring to the table are unmatched. This would have been > 100x worse if it hit a carrier neutral datacenter. They don’t have nearly > the same resources to restore something like this. They usually do a road > show (pre Covid). If you get a chance it’s definitely something you should > go check out. Very impressive. > > > > Robert DeVita > > Founder & CEO > > Mejeticks > > c. 469-441-8864 > > e. [email protected] > ------------------------------ > > *From:* NANOG <[email protected]> on behalf > of Eric Kuhnke <[email protected]> > *Sent:* Tuesday, December 29, 2020 5:06:00 PM > *To:* Sean Donelan <[email protected]> > *Cc:* NANOG <[email protected]> > *Subject:* Re: Nashville > > > > From a few days ago. Obviously centralizing lots of ss7/pstn stuff all in > one place has a long recovery time when it's physically damaged. Something > to think about for entities that own and operate traditional telco COs and > their plans for disaster recovery. > > > > > > Nv1 > > > > Here is the latest update: 6:46AM 12/27: > > > > Work continues restoring service to the CRS routers in the Nashville > Central Office. One router remains out of service and the other is in > service with some links remaining out of service. > > > > The working bridge will reconvene at 08:00 CT with the following action > plan: > > Additional cabling added to the first portable generator to enable full > load capabilities (08:00 CT) > > Pigtails with camlocks installed for easy swap; investigate possibility to > land generator on the emergency service board to give the site N+1 with a > manual ability to choose anyone. (08:00 CT) > > check small power plants on floors 4 and 6 (08:00 CT) > > Investigate water damage on 1st floor and energize if safe (08:00 CT > > Air handlers for floors 4,5 and 6 (09:00 CT) > > complete all transport work > > Turn up SS7 > > Turn up 911 service - Approximately noon or after) > > Turn up switching service. > > TDM Switching team will reconvene at 09:00 CT and the Signaling team will > reconvene at 11:00 CT on 12/27/2020. > > DMS equipment on the 1st floor will be assessed for water damage. > Switching teams will monitor power and HVAC restoration and will begin > switch restoration as soon as the go ahead is provided by the power team. > > > > Recovery Priorities: > > 1. 4th & 5th floors (Specify transport equipment needed to clear MTSO SS7 > isolation & Datakit needed for Local Switch restoration). Transport SMEs > currently working to turn up transport equipment > > 2. 6th floor (ESINET Groomers) > > 3. 10th and 8th floors (N4E) – Trunks > > 4. 1st floor (DMS: DS1, 5E: DS3) - Local POTS > > 5. 1st floor (DMS: DS0, DS2 | 5E: DS6) – Trunks > > 6. 11th floor (DMS: 01T) – Trunks > > 7. 4th floor (STP and SCP with mates up in Donelson) > > > > The next update will be issued at approximately 09:00 CT on December 27. > > > > > > > > Nv2 > > > > As of 09:00 CT: Teams worked through the night to restore service and > improve conditions at the Nashville 2nd Ave Central Office. Since the > initial service impact, over 75% of the Out of Service Mobility Sites have > been restored. Certain call flows may be limited and should improve as > additional restoration activities complete. > > The generator that is currently powering equipment on the 2nd and 3rd > floor, was refueled and ran with no issues through the night. Overnight, > the batteries connected to it, continued to charge. Teams have placed > additional power cables, which once connected, will allow the working > generator, to better handle the load in the building. In order to > accomplish this, the generator will need to be shut down for 15-30 minutes > this morning, so teams can connect the new cables to the system. The power > team reports they are still on target to restore power and cooling to the > 5th and 6th floor by approximately 12:00 CT. Also, a portable chiller will > be delivered this morning and strategically placed, in case it is needed to > assist in cooling the office. > > There is a Call Center at 333 Commerce, in Nashville that does not have > network or phone services available. Corporate Real Estate (CRE) reports > there is some damage to that office, but the extent of the damage will not > be known until they can gain access to the site. Because of this, the > impacted Call Center ceased operations until further notice. > > DMS switching equipment on the 1st floor will be assessed for water > damage. Switching teams will monitor power and HVAC restoration. Equipment > power ups will begin, as soon as the go ahead is provided by the power > team. > > Two SatCOLTs remain positioned on the East and West sides of the NSVLTNMT > Central Office providing critical communication for teams working > restoration efforts. There are 17 assets deployed in the field- 15 are on > air (the 2 at the CO and 13 supporting FN Customer Requests) and 2 are in > hot-standby for FN Customers where macro service recently recovered. There > is 1 asset staged at a deployment site in KY where macro service restored, > and 8 additional assets are on route to Nashville today to fulfill pending > FN Customer requests. Incoming requests continue to be triaged. The ones in > areas where service looks to have been restored, are being held, while the > others are being prioritized to be dispatched upon. > > > > The next update will be issued at approximately 14:00 CT, unless there is > a significant change in status. > > > > > > > > Nv3 > > > > AT&T Nashville update below, received at 3:35PM 12/27. > > > > Since the initial service impact, over 95% of the Out of Service Mobility > Sites have been restored. Certain call flows may be limited and should > improve as additional restoration activities complete. > > > > Electricians have installed the additional power cables from the > generator, to the emergency bus. These new cables will allow the generator > to support more of the load, of the building. The portable chiller > requested, has arrived on-site, and is available to assist in cooling, if > needed. Generally speaking, there are four (4) phases of restoration per > floor (Air Handler restoral, Power restoral, Transport Equipment restoral, > and Switch/Application Equipment restoral). Teams report that Air Handlers > are up and running, and all power plants are on floors 2 through 7 are > online. Given significant progress made, floors 2 through 7, are ready for > technology turn up. Relative to Priority Transport related equipment, > approximately 90% of the elements have been turned up on floors 2 through > 7. The Power team is currently working on Floors 8 through 11 (N4E). The > first floor is not accessible, at this time. Once access is granted by > federal and local authorities, further assessment and restoration efforts > will begin. > > > > The generator is currently supporting approximately 50% of its capacity, > and alternative plans are being considered to handle the full load of the > building. Teams continue to work proactively in effort to identify > potential issues and are actively engaged working to restore services and > repair infrastructure. > > > > AT&T Network Disaster Recovery (NDR) has eleven (11) SatCOLTs in service > (TN, AL, GA). Two (2) of the eleven (11) are deployed at the Nashville, TN > Central Office to provide coverage for the AT&T response teams as well as > FirstNet (FN) customers. One (1) COLT is in hot-standby (TN). Six (6) COLTs > are en-route to deployment sites in TN and AL. Three (3) COLTs are being > demobilized in Alabama and coming back to Nashville for new assignments and > five (5) additional COLTs are en-route to the Nashville area to support > additional requests. > > > > The next update will be issued at approximately 19:00 CT, unless there is > a significant change in status. > > > > > > > > On Mon, Dec 28, 2020, 5:59 PM Sean Donelan < [email protected] > wrote: > > > AT&T statement says nearly all services have been restore in Nashville as > of Monday, 5pm CST > > They are working on permanent repairs. > > https://about.att.com/pages/disaster_relief/nashville.html > <https://urldefense.proofpoint.com/v2/url?u=https-3A__mila.bitdam.com_api_v1.0_links_rewrite-5Fclick_-3Frewrite-5Ftoken-3DeyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJyZXdyaXRlX2lkIjoiNWZlYmI3MGZiOGZhNWRhYjg5ZjE0NzJiIiwidXJsIjoiIiwib3JnYW5pemF0aW9uX2lkIjoxNzgxfQ.fQSGLDVfXTrVFYepbx0AR-5FuG-5FqKj-2DUG337RhC567WBI-26url-3Dhttps-253A__about.att.com_pages_disaster-5Frelief_nashville.html&d=DwMF-g&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=-GzOCp0ppLaBQPFaZ7lZ4bUUBQxpFBukitRP75oaRdQ&m=QP--yQuEX4jG-74vYtzEjEKuDLrRan890jWR_pl9hjU&s=kRIGqeCVD61v63ETdC8ooxHNNAP0FfZyzYnYzgnpLPQ&e=> > > > AT&T's Network Disaster Recovery group faces management questions nearly > every year to justifying their budget. While no one wants disasters, > business continuity has to be part of the business. There are also mutual > aid agreements between companies, but I don't know how many were invoked > for this incident. > > https://about.att.com/ecms/dam/pages/disaster_relief/NDR_edited_04.22.19.pdf > > <https://urldefense.proofpoint.com/v2/url?u=https-3A__mila.bitdam.com_api_v1.0_links_rewrite-5Fclick_-3Frewrite-5Ftoken-3DeyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJyZXdyaXRlX2lkIjoiNWZlYmI3MGZlZTIwYTJmMzM5ZGM5ZTgwIiwidXJsIjoiIiwib3JnYW5pemF0aW9uX2lkIjoxNzgxfQ.xIE6w200hxqs5MLmTyAw3TKHl50TG9NaxjGW32JTEr8-26url-3Dhttps-253A__about.att.com_ecms_dam_pages_disaster-5Frelief_NDR-5Fedited-5F04.22.19.pdf&d=DwMF-g&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=-GzOCp0ppLaBQPFaZ7lZ4bUUBQxpFBukitRP75oaRdQ&m=QP--yQuEX4jG-74vYtzEjEKuDLrRan890jWR_pl9hjU&s=oSnRWvbMLFwj9B8SlCbqsU06WNkyqf2fALfQ2mlcMJg&e=> > > ------------------------------ > > This message and any attachments are intended only for the use of the > addressee and may contain information that is privileged and confidential. > If the reader of the message is not the intended recipient or an authorized > representative of the intended recipient, you are hereby notified that any > dissemination of this communication is strictly prohibited. If you have > received this communication in error, notify the sender immediately by > return email and delete the message and any attachments from your system. >
