batcavenet

Is there a limit to number of PRI in the phone system? We have a G3csi - and currently have 10 PRI lines. I am reading that a 744E says it only supports 8 ports?

Can I add more 744E or do I need to get something else to support more? or am I incorrect on how this functions since I have never ran into this before.

Thanks!

Jeremy

batcavenet

We are only able to get the coincidental number of 8 of 10 working ???

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martinyoung

ISDN T1s and TN744 Call Classifiers are not the same thing. So lets do one at a time.

You have ten ISDN-PRI DS1 cards in a G3csi. That should be ok but you are getting close. Do a "list measure load total today" and see what percent of occupancy you are showing. This will be the total tdm usage at the busiest time today. Do this for a few days. If you are running consistently at over 50% keep a real close eye on things. If you hit 70% (especially more than once) you are outgrowing the PBX you have today. If you stay under 50% you are ok but the preferred volume should be around 30%.

Another measurement to run is 'list measure tru sum today" and check the %ATB column. That is the percent of all trunks blocked, if there is an entry there see if it coincides with a high occupancy reading.

A TN744 is an advanced Tone Detecter and provides the additional tones used by ACDs. You can have as many of these you want. What they provide are the tones you hear everytime you use a phone, dial tone, DTMF tones when you dial the phone, ring tones, busy tones, etc. You can look at this with "list measure tone sum today", you do not want any entries in the two denied columns and your peak requests should not come near the total available. You will know if you are having problems with that because you will get complaints from people about going off hook and not hearing dial tone, when dialing the phone nothing happened, etc. Don't forget that the Tone Clock also provides these same tones.

__________________
Marty
Retired Avaya DSIC tech

thetris

you can do a list measurements tone-receiver. If the column in the most right part shows another value than 0 you have blocking on your tone-receiver an can add TN744E.

batcavenet

Ok I will check that out- any other ideas why these PRI won't come up? The settings are all correct in the phone system. I have them plugged into TN2464 and TN 2464BP

It seems like even if we unplug them for a second they might not come back up and Verizon is telling us that it is our problem because they can loop the CSU and they are not seeing the dchannel communications coming from my side.

ahays

Ditto what Marty says. The G3csi (ProLogix) is a single port network PBX and is only capable of handling a maximum of 242 simultaneous conversations. It is HIGHLY recomended that you not exceed 8 T1's in a given port network for this reason. If you consider intercom traffic, with 10 T1s you can easily exceed the PBXs capacity ... especially if you're in a call center environment queuing calls, etc.

Keep an eye on your processor occupancy. If you begin to notice slow dial-tones, mis-directed calls (i.e. showing up at the console as "unknown call") then it may be time to upgrade to an S8xx0. With an S8xx0 platform you can keep your existing cabinets and still add additional port networks making your growth less painful on the pocketbook.

regs,

.al.

__________________
Al Hays, ACE, MCSE, CCNA
Homepage: http://www.jeral.com/
Training: http://www.jeral.com/avaya-learning.html

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martinyoung

If you unseat a DS1 card and it doesn't come back up within a minute of reseating it, Verizon is probably correct. They cannot do anything to keep the card from initializing.

The usual causes for a card not to come back up is, it is defective or the processor is too busy to process that request. Do a "status health", what percent occupancy is the processor running? Do this now to get an immediate snapshot. Do it again during your slowest time of day, usually just before you open or after you close for the day. And do it one more time during the busiest part of the day, this is usually within a couple hours of opening and again right after lunch.

__________________
Marty
Retired Avaya DSIC tech

batcavenet

Measurements all seem ok - must be something else. It's almost like it is not trying to bring up the dchannel at all