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Activity Switch
#106529 09/13/07 04:01 PM
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I have NEVER had problems with an activity switch, but another vendor who has a key system on a point-to-point off of one of our 2Ks claims the activity switch is causing them all sorts of problems. I do see 1 slip on the ckt during the hr of the switch, but that shouldn't cause problems. I'm not willing to use them for a clock source (6 other digital links on this PBX and no problems on any of them). Any ideas here? I'm not sure if they're just looking for someone to point their finger at....

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Re: Activity Switch
#106530 09/14/07 04:30 AM
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What are the problems they're complaining about?
Do their problems only occur at 2am???
It does sound like they're grasping for excuses!


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Re: Activity Switch
#106531 09/14/07 05:15 AM
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Ok, education time. I'm always willing to learn. Define 'activity switch'. I understand you have a network of pbx/key systems linked by T1/PRI's. John C. (Not Garand)


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Re: Activity Switch
#106532 09/14/07 06:59 AM
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The SX2000 has redundant processors and hard drives. The system has an ACTIVE plane, and an INACTIVE plane.
By default, at 2am, an ACTIVITY SWITCH occurs, so you're running on a different "brain" on the next day.
The actual process takes about 45 minutes to complete, and the system uses conferencing circuits to make the transition seemless to anyone or anything that's currently on the phone.
The ACTIVITY SWITCH should be seemless to all of the phones and trunks, and in this case, seemless to the T! clocking.


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Re: Activity Switch
#106533 09/14/07 10:11 AM
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Thank you, you even worded it so I picked it up on the 1st read-thru! NEC2400's have/had that capability, but only switched processors on command or when the active cpu failed. And I'll bet a lot of other large scale systems have the same capability. John C. (Not Garand)


When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
Re: Activity Switch
#106534 09/14/07 10:30 AM
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Initially they were having these problems at 2am when the activity switch occurred, so I changed the activity switch to 3am, and their problems started occurring then. They will have issues like phantom calls coming in at the time of the activity switch, they claim the circuit goes down (which I don't see, although I will get SMDR logs on multiple trunks with no digits sent when they claim it goes down), and they get alarms of slips. The only thing I can say is their system is too darn sensitive to what may potentially be 1 slip (at the most!). I've even forced activity switches in the middle of the day while talking to them on that circuit - our calls stay up - (admittedly one time our call did drop - but even that time the circuit didn't drop). Duty cycle 100%, framing losses - 0, bit error rate - 0. Everything looks good.

Re: Activity Switch
#106535 09/14/07 10:45 AM
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Could it be that it only happens when going from
A to B, or from B to A???
That would point to a bad processor, which is where the clock is located.


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Re: Activity Switch
#106536 09/14/07 11:19 AM
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It does happen on both planes. I have noticed that the first 7 or 8 calls that are attempted to get through to them after the activty switch fail, and all subsequent calls seem to get through just fine. There is a software log generated for each failed SMDR log but that software log only appears when Plane B is active.

Re: Activity Switch
#106537 09/14/07 02:00 PM
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The calls that fail,,,,,
Are they during the activity switch, later in the day, or both????
Are you using SMDR, or just storing it in the buffers?


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Re: Activity Switch
#106538 09/14/07 03:37 PM
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The calls that fail occur after the activity switch. No matter when the calls first come in - whether it is at 3:10 or at 6:30 - the first calls that come in to each trunk usually end up not getting through (caller hears dead air) until that trunk is accessed again (trks in circular grp). SMDR logs show abandoned call on 2K trk with digits dialed, but don't show trk to other system. If there are 8 trks in the circular group there are usually 8 failed calls before the first successful call, which will come in on first trunk in grp.
SMDR used only for call acct - I'm just reading logs to help troubleshoot this.
Thanks for your help and ideas!

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