Time Slice Limit in G3r?

[mikej97204]

We have a G3r v9.5 switch. We are very heavy on the trunk side running about 40 ISDN-PRI T1's. Currently we run about 250 simutanious inbound/outbound calls with it growing to about 350 over the next couple of months.

I was told that there is a limit to how many simutanious calls the R can do because of the number of time slices available. Can someone tell me what the limit is for the R? We are running 3 carriers within the R cabinet and have a J58890N expansion cabinet and are going to be adding a J58890H expansion cabinet soon.

We started to run into a time slice limitation with the G3si we had, which is why we moved up to a G3r, hopefully so we could get another year or two out of it before we have to spend the big bucks to move to a 8500 or something else.

Does anyone know what the hard limitation is?

Thanks

Mike

 

[4merAvaya]

Each Port Network can handle 241 simutaneous 2-party calls. You can use the Avaya Reports Manual to look at you load balancing and blockage. The link to the manual is below.

The reports of interenst would be:

'list measurements load-balance total [yesterday, today, last-hour]'.

'list measurements blockage pn [yesterday, today, last-hour]'.

Kevin

http://support.avaya.com/elmodocs2/comm_mgr/r4_0/pdfs/233505_6.pdf

 

[mikej97204]

Thanks, Kevin, for the quick reply. I downloaded the Reports Manual and will take a look at that. I did the load-blance list and got this:

PORT NETWORK LOAD BALANCE STUDY REPORT
TOTAL CALLS
Time Division Multiplexed(TDM) Port Network(PN) Link
Meas -------------------------------- --------------------------------
PN Hour Usage Peg Peak Blockage %Occ Usage Peg Peak Blockage %Occ

1 1100 11813 8259 412 0 68 850 460 44 0 3
2 1100 1650 965 84 0 9 734 241 34 0 3


And the PN blockage:

BLOCKAGE STUDY REPORT

Meas Time Division Multiplexed(TDM) Port Network(PN) Link
PN Hour Usage Peg Peak Blockage Time-slots Usage Peg Peak Blockage

1 1100 11813 8259 412 0 766 850 460 44 0
2 1100 1650 965 84 0 766 734 241 34 0

You said each port network can handle 241 2 party calls. Is that the trunks that are in the expansion port network cabinet or all cabinets, including the main R cabinet?

Right now we have about 250 calls going on. Those are 2 party calls and some 3rd party calls and includes both inbounds and outbounds.

I don't see any blockage in the two reports, but does the report say how close it is getting to having blockage?

Thanks again.

Mike

 

[lopes1211]

it's "more or less" for practical purposes the "412" number on your 2nd report divided by 2 for you max 2 way call volume. So today you had 206 calls in PN 1 (getting close)and 42 in PN 2 (plenty of room). Moving some DS1's from PN1 to PN2 will help balance your system out.

-CL

 

[mikej97204]

CL, thanks. On the report, is it correct to assume that PN 1 is the main R cabinet with the 3 carriers and PN 2 is the expansion carrier we have?

If this is so, currently I have 10 TN464F cards in the expansion cabinet and 33 in the main cabinet. I only have 2 slots free in the expansion cabinet but I should be able to move two of my heavier traffic T1's over there. If what I'm hearing you and Kevin say, that should give me some more breathing room. Correct?

Now my next question is, when we add the next J58890H expansion cabinet, does that have another group of time slices or will that be included with the J58890N cabinet that it is going to connect too?

Thanks a lot for the info, I really appreciate it.

Mike

 

[lopes1211]

don't remeber my J codes off the top of my head but if you are adding a carrirer to the existing port network (i.e. adding a B carrier to an existing A carrier) that give you no additional time slots as they are in the same port network. If you are adding a new A carrier as cabinet 3, yes you would get another set of time slots.

-CL

 

[mikej97204]

From what I understand when the engineer was in here looking over what we had and what needed to be done, we are adding a B carrier to the A carrier that is already there. So you are probably correct then that we wouldn't get any additional time slices. I'll have to run that by him when I talk to him. Even if it doesn't give us more time slices, it gives me more ports to move some additional trunks from PN 1 to balance the load more.

Thanks again.

Mike

 

[4merAvaya]

PN 2 only has 9% occupancy. PN 1 has 68%. Moving move DS-1s to PN 2 will help balance the traffic.

Don't go above 75% on a PN.

Kevin

Port Network (PN) Capacity

512 time slots per Port Network
483 time slots usable for call processing
Minimum of 2 time slots/call
Maximum of 241 simultaneous calls per Port Network
Maximum port usage per Port Network 17,388 CCS

 

[mikej97204]

It's a good thing the engineer was in yesterday looking. I was talking to him about the large volume we have just started getting and more coming this summer. He took one look at the PN 1 cabinet and said I was probably getting close to maxing out the time slots. As you have all pointed out, that is true and I suspect it would have come very close if not actually maxing out on Monday when we expect to have a very busy day. Now I can come in this weekend (oh joy) and move two of the busy DS1 cards over to PN 2 to keep things balanced a bit.

Thanks a lot guys.

Mike

 

[Tolson]

One quick note to add is that you should not exceed approx 8 T1s is a port network. If all channels are used at any one point that is 238 calls or single sides of the two sided conversation. Limit of time slots is 241 two sided conversations.

You stated that you have 33 T1s in the main cabinet. If they all become busy the system will not support it. You can get away with more T1s if calls are coming in and going to something like an IVR where the T1 boards are used like stations.

 

[mikej97204]

Tolson, no, they aren't all busy at the same time. Although we are heading in that direction with the growth we are seeing and what we are expecting over the next few months. Growth is good but we don't need surprises like all of a sudden running out of time slices.

We are pushing 300 to 325 simultaneous calls right now (these are inbound calls conferenced to an outbound call that some have a 3rd call conferenced to it) not counting the growth we have coming. We do have one T1 that part of our IVR but it isn't that busy at any one time.

Thanks for the additional information, Tolson. I will be in this weekend moving a couple of T1's over to the PN 2 cabinet since we are expected to get slammed with calls on Monday. And the heavy T1's are mostly on the PN 1 cabinet.

Mike