Positive disconnect (ANALOG) on 3300MXe

[jchesnut]

I'm running a MXe with a few peripheral nodes supporting many, many analog and DNI's along with lost of IP (minet and sip) sets on a 600 acre campus.

I've got a bunch of analog emergency phones around the campus that I'm having trouble connecting to the 3300. I'm testing on both ONS and OPS cards in peripheral nodes connected to a 3300MXe.

When the "CALL" button on the emergency phone is pressed, it goes off-hook. No problem getting the 3300 to hotline to the dispatch center, and the call proceeds ok. When the remote side (dispatch center) hangs up, I'm having trouble getting the emergency phone to disconnect. Instead, the emergency phone remains off-hook, causing another call to the dispatch center, and so on.....

What I need is for the battery voltage to drop once the remote side disconnects - anybody remember "Positive Disconnect" from the SX2000? Tried setting this up with both ONS and OPS cards without success. Documentation on this archaic setup is spotty (for good reason!).

Anybody out there remember how to set this up? It looks like dropping voltage may only be available on the OPS cards - no problems there, as most of these emergency phones would need to be on OPS circuits anyways.

The best I've been able to do is get it to present dead air (silence) to the emergency phone when the remote side disconnects - got that running by setting up a separate COS and setting the "Return Disconnect Tone When Far End Party Clears" to "YES". Now it appears to work (at least it's not calling the dispatch center repeatedly), but until the local call timer on the emergency phone expires (5 minutes), the emergency phone stays off-hook, resetting when the local call timer expires.

Anybody out there remember doing anything similar?!?!?

Thanks!

 

[Lundah]

What release is running on the ICP, and what card/ASU are you using for the ONS/OPS circuits to the emergency phones?

 

[Lundah]

Checking the 7.1.6.10 (7.1 UR3) docs, it looks like you need to fool around with the ONS/OPS Circuit Assignment form. Set up a seperate circuit descriptor number for the ONS and the OPS circuits. For OPS, looks like you may want to tweak the RAD Loop Disconnect Timer setting. For ONS circuits, change Positive Disconnect to "Yes" and then tweak the Positive Disconnect Timer setting (hopefully you still have docs on the emergency phones that tell you what this setting should be).

I don't know if these options are available on all the different varities of ONS interfaces available on the MXe, I'm just reading this from the SysAdmin Help tool, not actually poking around in a live switch.

 

[jchesnut]

Mostly MC320BE's and MC321AC's for cards. (Got some newer 3300 ASU's that I haven't tried this with yet though - might be worth a shot?)

The MXe is running 7.1 UR3 w/ SP1.

 

[jchesnut]

Thanks for that! I've setup 2 circuit descriptors - one for the ONS card, another for the OPS, and set the Positive Disconnect Timer to "YES" for both. The emergency phones don't list the time setting, but testing with a timed power supply shows that dropping battery for 0.25 will put the phone back on-hook. I'm going to do some testing on the switch tomorrow with a scope because even with the Positive Disconnect Timer set way high, I'm still seeing full battery voltage after a remote disconnect.

Not sure about the difference between the two settings though - RAD Loop Disconnect vs. Positive Disconnect timer. Looking at the online help, it appears that the RAD stuff may only be available with OPS cards?

Will do some more poking around tomorrow. Got kind of frustrated earlier....

Thanks for the suggestions!

 

[Lundah]

Honestly in this case I'd stick with the "old school" Per cards. I have a hunch the ASU's may not have the electronics required to handle this sort of thing.

 

[Lundah]

Yes, the RAD Disconnect timer only applies to OPS circuits, while the Positive Disconnect Timer only applies to the ONS ports. Same thing, just programmed in different fields for different hardware. Good luck!

 

[jchesnut]

Fair enough - point taken on the ASU's vs. legacy cards. Even the ONS cards don't have beefy enough finals to drive decent volume to the emergency phones. Probably going to end up with more OPS cards (they're getting hard to find though)!

At the end of the day, if the voltage on the OPS doesn't drop on remote disconnect, I'll give it a go on a SX2000 Light and see if it's just a 3300 weirdness........

Thx for the advice - will post results tomorrow!

 

[T8keiteasy]

What about this ?

Cos option

Return Disconnect Tone When Far End Party Clear

Select "Yes" to return busy tone instead of dial tone when the far end hangs up. This option is commonly used for analog devices such as FAX machines to prevent them from remaining in an off-hook state after an incoming call is ended.


Now, it's about French users too !!!