IPDA AP3700

[gkreg]

Hi tech,

anyone how many total PCM highway of AP3700.it has a 10 slot only.
it is possible to config 900 IP Number in one AP3700 we used 4 HG cards.


thaanks

 

[donb01]

The shelf is split into 2 sides to either side of the NCUI card. Each side has 128 timeslots (simultaneous events) that can occur. One other consideration is the NCUI you are using - whether it is a 60 channel or 120 channel board, because that provides the speech paths back to the mothership. In theory, because you can configure a STMI4 in pure HFA for 240 phones, you could put 2 boards on either side of the NCUI, BUT... Your first limit is 256 internal calls because that is the maximum timeslots available, your second limit is the number of NCUI channels you have for speech paths. A side discussion on the second limit is if you have your system properly configured to use DMC you could potenetially have the phones connect peer to peer and drop the speech path, but it still needs an open speech path to initiate and set up the call. Even with DMC your phone calls will still retain a signalling path through the switch to monitor the state of the call.

My short answer is I would strongly recommend against it, because in your best case the shelf can support 256 simultaneous events, and if you had 900 phones on there, and it was a very busy time, 3 out of 4 phones (75% of them) would potentially have no dial tone when they pick up the handset, and that's in a perfect world. The next consideration is even if you could do 250 simultaneous calls to the shelf, would your WAN connection from site A to site B be able to support that much bandwith (87 Kbps for best quality)??

Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA

 

[gkreg]

Hi don

thank's very much.


what if i added additional isdn card 60 channels? is it posible while im having 900 ip phone, i used ncui card 120 channels. in one ap3700 IP.

thanks
regards, gkreg

 

[donb01]

I guess to summarize my point above, and I guess I'm speaking facetiously so if someone knows better I'm sure they will be happy to correct me, theoretically, if you have enough power supplies in the shelf you could put an STMI card configured for 240 phones in every slot except 6 if you want (assuming you have that many licenses), but the cold hard fact of the matter is that there can be no more than 256 events occurring simultaneously (that I'm aware of), and consider an event is not just a phone call (which could take up more than one event if the other phone is on the same shelf), but also someone picking up the phone to get dial tone, a phone ringing, if a phone is call forwarded there will be one event for the call coming in, and another for the call going out until the original call is dropped. Now, of that 256 events, only 120 of those events can be any type of phone call or process that requires a speech path on the NCUI.

It is not so much a physical limitation of the hardware as it is the resources to support that hardware. If you look into the spec sheets for the 4000 platform I do believe it tells you what the physical and practical limits are for an AP3700 shelf in terms of maximum phones it can support, maximum trunks, maximum analog devices, etc.....

Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA

 

[sbcsu]

There is a tool from Unify which gives you the 'best practice' when setting up new shelves.
I presume it is related to the ordering process.
That program will advise you that you need a new shelf if you are adding more than a certain amount so as to avoid blocking.
If you are following the ordering processes then a blocking situation should not occur.

 

[gkreg]

Hi
thanks again donb01&sbcsu.