atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Telecom Service & Providers T-1's Needed

If an office has approx. 300 employees how many voice T-1's should they have?

Thanks
Tangoe09

Are you feeding the T-1s into a PBX? Looking to set up DID trunks? Running into a Channel Bank and hanging SLTs all over the place?

How busy is the office? Is most of the traffic internal, outgoing or incoming?

Give us a little more information please.

Sam

I am with Silvesam. We need to know a little more about your office enviroment in order to advise properly.

In a standard office the average is about 4 to 6 people per trunk available.

IE 300 people = 50 to 75 trunks. 2 to 3 PRI's

This is a standard enviroment. In order to advise you we need to what your main communication path is Incomming, Outgoing? Is it a call center? Is a manufacturing center tied to a corporate office?

These are similar questions that you should consider when describing your site.

Brian.

Sam, Brian:

This is not a call center. Typical office with as much incoming as outgoing, this is the corporate office. I would be feeding T-1(s) into a PBX not thru channel banks. They would be DID DOD's. Hope that is enough info.

Tangoe09

Each T-1 has 24 channels (i.e. 24 simultaneous conversations) - unless you run it through a concentrator, in which case you can get up to 96 conversations out of each one - but at a price.

Assuming standard service, depending on your traffic you would probably need 3 to 4 T-1s. We used to figure 100 DIDs on 12 - 16 trunks. At that level you would need 1.5-2 T's just for incoming, leaving 1.5 -2 T's for outgoing. Assuming no compression, you could have 36-48 simultaneous outgoing calls and 36-48 simultaneous incoming calls.

Depending on your carrier and your PBX you may be able to get "dynamic" T's that are not fixed to X number of Incoming and Y number of outgoing channels, but instead dynamically reconfigure depending on your traffic. Failing that you may be able to split some of the T's (i.e. half incoming DIDs and half outgoing DODs) this will give you a little more protection in the event of a failure.

Determining traffic is a whole science (maybe really an art). I used to do quite a bit of it, but that was 20 years ago and I'm more then a little rusty. You should run traffic studies on your current configuration (most PBXs & COs support this) and then determine your needs from there.


Sam

Thanks much Sam, that was pretty much the info I need to answer the questions posed to me.

Tangoe09

Glad to be able to help. Let us know how it works out.

Sam