Kitz Forum
Broadband Related => Known Network Issues + MSO's => Topic started by: sheddyian on January 14, 2016, 01:44:38 PM
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I went to use the phone this morning, and found no dialtone. A quick google and I find there's a widespread outage today on TalkTalk telephony. No dial tone, unable to make calls, incoming calls receive a message to the effect that the number is not known. Internet access not affected. Being reported by people seemingly spread across the UK, but [I'm assuming] not by everyone.
Out of curiosity, what sort of fault could cause this? An exchange fault would just affect customers on that one exchange wouldn't it?, how can this outage be so widespread (and yet seemingly not affect everyone on TalkTalk)?
Ian
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Not sure of the terminology, but if TT PSTN infrastructure is similar to BT's (which it will I'm sure) ......... local Exchange switches will be routed to a 'Super-node'. Around my way, half my patch are routed to Manchester, whereas the other half is routed to Preston.
If you'll indulge me, I remember nearly 30yrs ago and a particular System X suite when down at Preston Super-Node, and it was down to a 'Battery Sensing Fuse'.
I can't remember the ins and outs, as I was a Power Construction engineer at the time, but our Power Maintenance brothers mentioned that this tiny milliamp fuse had popped and had caused the entire power-cabinet feeding the suite to shut down !! A million memo's later and all sense fuses were either removed or replaced, can't remember which ??
Something as simple as that caused what was classed as a MSO (Major Service Outage). :)
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Something as simple as that caused what was classed as a MSO (Major Service Outage). :)
Ah thanks for the tech info, always interesting to read. I wonder if we'll ever officially know what's happened today? TalkTalk reporting that some (majority?) users now have service restored, but I'm still off.
Ian
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I only have become aware of today's outage by reading this thread. Checking via my telephone (timed as this post) I do receive a
dial-tone "proceed to initiate a call tone".
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Hmmm, how strange ?? I've just checked my e-mails and there's one from a manager of a different patch to mine, and it states that Talk-Talk have informed BT that there are issues with the EXFO HHT not being able to synch-up with their BB product.
A fix is being worked on.
That's all I have I'm afraid.
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I only have become aware of today's outage by reading this thread. Checking via my telephone (timed as this post) I do receive a dial-tone "proceed to initiate a call tone".
Mine was down at about 9am - just a slight hiss when I picked the handset up - and was still down at about 2:30pm when I went out, but was working when I got back again around 4:30pm.
Ian
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Hmmm, how strange ?? I've just checked my e-mails and there's one from a manager of a different patch to mine, and it states that Talk-Talk have informed BT that there are issues with the EXFO HHT not being able to synch-up with their BB product.
A fix is being worked on.
That's all I have I'm afraid.
My ADSL Broadband was working fine throughout, just unable to make or receive voice calls!
Ian
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It only affects OR's EXFO testers ......... not EU's routers.
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It only affects OR's EXFO testers ......... not EU's routers.
Ah, sorry, I misunderstood.
Ian
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As oft I do .... ;D ;D.
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Not sure of the terminology, but if TT PSTN infrastructure is similar to BT's
I dont think it is. The full MPF LLU providers use IP for delivery of voice. Their MSANs convert voice to digital.
If their telephony system is down, then its no surprise that the HHTs may not work properly. Note that today isnt the first time this has happened recently.. This (http://community.talktalk.co.uk/t5/Current-Known-Service-Issues/No-dial-tone-Now-Resolved/m-p/1848757#M233) is last Thurs
During a major system upgrade we experienced an issue that may have impacted some of our customers dial tones and ability to make or receive calls from their landlines. We’re pleased to say this is now resolved and customers should be able to make and receive calls as normal.
BT still use their traditional PSTN system. About 8/10 years ago they were supposed to start using IP delivery on 21CN, but they backed out for some reason and all has been quiet since on that score.