shipwright
Technical User
Could anyone explain the difference between a T1 and a Pri. Thankyou very muchly
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations gkittelson on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
T1 or Pri 6
- Thread starter shipwright
- Start date
- Status
Uh- Oh
OK I'm feeling brave tonight...
A 'channelized' carrier is a kind of time domain multiplexing data transmition system that has been formatted to carry data in a specific way. T1 formatting was designed to carry multiples or block multiples of 64kbps data streams.
A DS 0 is a 64 Kbps carrier. A channelized DS 0 is normally used as an ISDN access method. BRI or Basic Rate Interface is a 64Kbps connection and a
OK I'm feeling brave tonight...
A 'channelized' carrier is a kind of time domain multiplexing data transmition system that has been formatted to carry data in a specific way. T1 formatting was designed to carry multiples or block multiples of 64kbps data streams.
A DS 0 is a 64 Kbps carrier. A channelized DS 0 is normally used as an ISDN access method. BRI or Basic Rate Interface is a 64Kbps connection and a
-
4
- #3
The way I explain it is that a T-1 has 24 channels available for calls either incoming or outgoing. It steals a few Bits out of each channel for direction therefore it isn't as 'clean' a signal. For voice, it really doesn't matter as you and I couldn't tell the difference.
But a PRI (primary rate interface) has 23 channels. It takes an entire 24th channel for direction, leaving the remaining 23 completely clear. Great for data! MRoberts
mroberts@americaii.com
If you find a tip helpful, please mark it as such.
But a PRI (primary rate interface) has 23 channels. It takes an entire 24th channel for direction, leaving the remaining 23 completely clear. Great for data! MRoberts
mroberts@americaii.com
If you find a tip helpful, please mark it as such.
-
2
- #4
The differences are actually numerous. A PRI is an ISDN service that allows your CPE to communicate directly with the Phone Company's switch. This allows you to have control over calls before they even touch your switch. For instance you have a call coming in for a particular DID, You can direct the Phone company switch to always put that DID over Channel 11 (or whatever). Some telcos will not offer Caller ID over T1s but will over ISDN-PRI. There are quite a few other features but I am not sure the Norstar will allow what I have mentioned much less those expanded services.
- Thread starter
- #7
shipwright
Technical User
So as far as voice in a N* goes i can get the telco to reserve 4 "channels" to be used as eg, "did trunks"and the remaining 19 would be used for voice calls.Would it use the same 4 channels or just 4 that are available??
Thanks again.
Thanks again.
Shipwright,
If you are talking about a PRI. All channels are DID. You can't really turn that off. In a T1, you can specify by channel, DID, PBX 2-Way, and some other options. Since you have to specify which timeslot (or channel) is what, it will always us the same channels.
Hope that helps
Steve
If you are talking about a PRI. All channels are DID. You can't really turn that off. In a T1, you can specify by channel, DID, PBX 2-Way, and some other options. Since you have to specify which timeslot (or channel) is what, it will always us the same channels.
Hope that helps
Steve
- Thread starter
- #10
shipwright
Technical User
Yes i am talking PRI ,Soooo , if all channels are DID's are they assigned a range of telephone numbers (which would be 23 in total) or are they trunk paths in from the co.
This to ARR i just thought you stopped being brave and went to sleep. hahaha
This to ARR i just thought you stopped being brave and went to sleep. hahaha
Shipwright,
When a call comes into a DID trunk (whether PRI or not) the telco switch passes the "Called number" information to your switch (in this case Norstar). The Norstar switch then routes the call to the appropriate set.
You can have virtually an unlimited number of DIDs coming into your DID trunks. Any DID call can come in on any channel.
The advantage of PRI over regular T1 DID is that you can also use those trunks for outgoing calls.
Steve
When a call comes into a DID trunk (whether PRI or not) the telco switch passes the "Called number" information to your switch (in this case Norstar). The Norstar switch then routes the call to the appropriate set.
You can have virtually an unlimited number of DIDs coming into your DID trunks. Any DID call can come in on any channel.
The advantage of PRI over regular T1 DID is that you can also use those trunks for outgoing calls.
Steve
Well, you can use straight T trunks for outgoing also. Two way DIDs aren't exclusive to PRI. MRoberts
mroberts@americaii.com
If you find a tip helpful, please mark it as such.
mroberts@americaii.com
If you find a tip helpful, please mark it as such.
Yes, two way DIDs are supported by the Norstar system. You set up the channels as E&M and Auto Answer. I've been working with Norstars for 9 years now. Works great.
The signaling is wink so the Telco queries the Norstar, we wink back and say yes, we're here, send the digits, they send the digits over whatever channel is available (not the same one every time)and sends the digits. We receive those digits on the virtual target lines and then ring the phone that the target line is assigned to.
That's it in a nut shell. MRoberts
mroberts@americaii.com
If you find a tip helpful, please mark it as such.
The signaling is wink so the Telco queries the Norstar, we wink back and say yes, we're here, send the digits, they send the digits over whatever channel is available (not the same one every time)and sends the digits. We receive those digits on the virtual target lines and then ring the phone that the target line is assigned to.
That's it in a nut shell. MRoberts
mroberts@americaii.com
If you find a tip helpful, please mark it as such.
sscott1234
IS-IT--Management
im running two mics w/5.0 w/pri. works great but be sure to get someone at the telco who knows what there doing. first make sure your running 5.0. glitch on the 4.0. as stated before incoming calls are directed w/ the received digits to an assigned target line. unfortunately the norstar does not treat the digital lines like an analog lines. all outgoing calls must be made through the intercom keys. target lines that ring and appear on a set can only take incoming calls on the assigned target line. and they do not interchange status wise even if they appear on multiple sets. but if u have the call volume it is definitely the way to go. its a lower rate for the 23 'paths' and only $3 for each telephone number.
- Thread starter
- #17
shipwright
Technical User
To all postees on this topic thanks very much for the info . ................RAY................
billroland
IS-IT--Management
We have a Norstar system we bought last January from Sprint. Back in September we converted from an analog setup to a T1 bundled service with voice/data. We have 10 channels and DID #'s and the whole works. Now, I know next to nothing about this thing, but I just want to confirm something the Sprint programmer said. We wanted the in-use "channels" to light up on the T7136 phones so they appeared as "lines," and we wanted the ability to push one of these unlit "lines" and just dial out instead of intercom 8, then dial. Now, the programmer said this was impossible, but I want to know from you guys if it is. She was, self-adittedly, very new to programming T1's, so I'm just making sure the system is really incapable of doing this like she said. I'd hate to have wasted functionality.
jerryreeve
Vendor
billroland, If you want to have a button to punch so you do not have to dial the outgoing route code "9" or "8" you can program a button on your phone to feature * 1 press the button to program 9 ok. this will have that button dial the access code for you. it is in my humble opinion a waste of resources (button) but I did have one customer that insisted that that was what they needed so I gave it to them that way. in effect the button is just another 9 button on the phone or 8 if you use that code. JerryReeve
Communications Systems Int'l
com-sys.com
Communications Systems Int'l
com-sys.com
- Status
Similar threads
- Locked
- Question