<puke> -----Original Message----- From: Peter Karunyu <pkarunyu@gmail.com> Reply-to: Skunkworks Forum <skunkworks@lists.my.co.ke> To: Skunkworks Forum <skunkworks@lists.my.co.ke> Subject: Re: [Skunkworks] Zain outtage?? Date: Tue, 6 Oct 2009 12:02:50 +0300 @Job, thanks to skunkworks, I can now take part in intelligent conversations with intelligent people talking about intelligent sounding stuff like ADMs, BSCs, MSCs and my ultimate favourite, DTMF! :-) If skunksworks was a person, I would make him my best friend! On Tue, Oct 6, 2009 at 11:28 AM, Job Muriuki <muriukin@gmail.com> wrote: Don't you love this list, all the tech stuff is very impressive anyway give Zain a breather. Look at the incumbent in there sector, it has all kinds of issues and Zain gets a rear tech hitch and you are quick to judge. It has the best voice service in kenya. On 10/6/09, David Kiania | Asentric Consulting Ltd <kianiadee@gmail.com> wrote: > It's not possible to comprehend the problem unless you understand the > GSM Architecture in the light of what Nick has offered to be correct > and heard the same from another reliable source. All Nairobi and > greater Nairobi all the way to Kajiado is handled by a BSC site in a > building within the CBD and is backhauled to Parkside where the MSC is > located via fiber. > > As part of the transmission design they have Add Drop Multiplexers > (ADMs) which provision STM connections depending on need and > protection to the MSC site or other locations. It's these ADMs that > failed causing the problem. This is would have been the case had it > been a physical fiber break and it reveals need for additional > transmission redundancy or protection as is commonly referred. > > It's not unusual for incidents like this to occur in normal operations > of a GSM network and we should not be very harsh on them. The loss of > business during this window is punishment enough. > > Kiania > > > > > > > > > On Tue, Oct 6, 2009 at 9:48 AM, nick muttai <nmuttai@gmail.com> wrote: >> Roy, >> True that, but all hardware modules in a BSC are totally redundant (either >> 1+1 or N+1 redundancy scheme) including the PCM interface >> boards, providing >> an automatic failover switch capability. This is true for all serious GSM >> equipment vendors. So the services dependent on these modules shouldn't be >> down that long especially for a big GSM provider like Zain and in >> locations >> like the CBD where the number of subscribers is humongous. >> This is all based on a lot of theory and a little bit of observation so my >> conjecture is open to correction. >> On Tue, Oct 6, 2009 at 9:15 AM, Roy Michoma <roymichoma@gmail.com> wrote: >>> >>> u cant have redundant BSC's >>> >>> On Tue, Oct 6, 2009 at 8:51 AM, Alvin Jason Ochieng <ajochola@gmail.com> >>> wrote: >>>> >>>> My line is also down & i have no bills pending !!! NKT !!!! >>>> >>>> On 10/6/09, nick muttai <nmuttai@gmail.com> wrote: >>>>> >>>>> A reliable source tells me that one of their their ADMs "died" Any Zain >>>>> guy to confirm this?And how comes they do not have redundancy on key >>>>> BSC >>>>> components and services? >>>>> On Tue, Oct 6, 2009 at 8:21 AM, Jared Koyier <jaredkoyier@gmail.com> >>>>> wrote: >>>>>> >>>>>> SOLOMON....Surely do you think ZAIN anticipated an outtage at peak hrs >>>>>> and let it take course? Most technical faults are never seen apriori >>>>>> and it is unrealistic for a customer to be warned beforehand unless it >>>>>> is a scheduled maintenance. Dont fry zain,they lost more biz than >>>>>> majority of their subscibers due to that outtage. >>>>>> >>>>>> On 06/10/2009, Steve Muchai <smuchai@gmail.com> wrote: >>>>>> > On Tue, Oct 6, 2009 at 7:55 AM, Solomon Mburu <solo.mburu@gmail.com> >>>>>> > wrote: >>>>>> >> One strange thing, though, they didn't inform the consumers of an >>>>>> >> impending outage. >>>>>> > >>>>>> > there was never an "impending" outage, it was an unexpected outage. >>>>>> > They did send out an apology, thus acknowledging the incident, >>>>>> > though, >>>>>> > which I think is a good thing. >>>>>> > >>>>>> > BR, >>>>>> > S >>>>>> > _______________________________________________ >>>>>> > Skunkworks mailing list >>>>>> > Skunkworks@lists.my.co.ke >>>>>> > http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks >>>>>> > Other services @ http://my.co.ke >>>>>> > Other lists >>>>>> > ------------- >>>>>> > Announce: >>>>>> > http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce >>>>>> > Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science >>>>>> > kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general >>>>>> > >>>>>> _______________________________________________ >>>>>> Skunkworks mailing list >>>>>> Skunkworks@lists.my.co.ke >>>>>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks >>>>>> Other services @ http://my.co.ke >>>>>> Other lists >>>>>> ------------- >>>>>> Announce: >>>>>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce >>>>>> Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science >>>>>> kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general >>>>> >>>>> >>>>> >>>>> -- >>>>> Mwafrika >>>>> >>>>> _______________________________________________ >>>>> Skunkworks mailing list >>>>> Skunkworks@lists.my.co.ke >>>>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks >>>>> Other services @ http://my.co.ke >>>>> Other lists >>>>> ------------- >>>>> Announce: >>>>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce >>>>> Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science >>>>> kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general >>>> >>>> >>>> _______________________________________________ >>>> Skunkworks mailing list >>>> Skunkworks@lists.my.co.ke >>>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks >>>> Other services @ http://my.co.ke >>>> Other lists >>>> ------------- >>>> Announce: >>>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce >>>> Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science >>>> kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general >>> >>> >>> _______________________________________________ >>> Skunkworks mailing list >>> Skunkworks@lists.my.co.ke >>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks >>> Other services @ http://my.co.ke >>> Other lists >>> ------------- >>> Announce: >>> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce >>> Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science >>> kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general >> >> >> >> -- >> Mwafrika >> >> _______________________________________________ >> Skunkworks mailing list >> Skunkworks@lists.my.co.ke >> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks >> Other services @ http://my.co.ke >> Other lists >> ------------- >> Announce: >> http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce >> Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science >> kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general >> > > > > -- > > [Asentric Consulting Ltd] > > If a man has in himself the soul of a slave will he not become one no > matter what his birth .... > > -Richest Man in Babylon > _______________________________________________ > Skunkworks mailing list > Skunkworks@lists.my.co.ke > http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks > Other services @ http://my.co.ke > Other lists > ------------- > Announce: http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce > Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science > kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general > -- Sent from my mobile device _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks Other services @ http://my.co.ke Other lists ------------- Announce: http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks Other services @ http://my.co.ke Other lists ------------- Announce: http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks-announce Science: http://lists.my.co.ke/cgi-bin/mailman/listinfo/science kazi: http://lists.my.co.ke/cgi-bin/mailman/admin/kazi/general -- Regards, Joe Linux User: #361092 SIP: joe.njeru@ekiga.net