Connecting via P2P t1 wan

[digiandy]

Hello,

I have searched the forum and seen many different threads on this, but dont know which is better.

My question is: I have a dedicated full p2p t1 (US) between the 2 offices; Is it better to use the wan ports, or the pri cards. (I have to purchase either csu's or pri cards, but do not care about the price, just better usage.)

I have seen it mentioned both ways, but didnt know if there were differences. I assume you need vcms at both ends no matter which way it is done. would there be any difference for it handling the DIDs?

-Site 1 is a 403 with 2420 digital phones, a pri trunk, and 3 analog trunks.
-Site 2 is a 403 with 2420 digital phones, 2 analog trunks.
-The catch is almost all users are at site 2 and need access to the PRI trunk and ALL Incomming calls come in the PRI.
-I would like the p2p to also be able to be used for data, not just voice. (very, very, small amount of data traffic).

Thanks in advance,
ANDY

BTW, this is a new implementation so there are not other routers besides the IPOs. could be purchased if needed.

 

[Wally1775]

I can tell you that my implementations of SCN with a P2P through the WAN ports have been flawless. With the IPO controlling the edge, it handles all the QoS and that makes things easier too.

Unfortunately I have no experience with using the PRI card for this, so I can't say which is better if either. But the WAN port works great, and even with the purchase of a DSU, your implementation cost is lower. (I know that isn't your main concern, but it never hurts right?) Good luck.

 

[kflounders]

I agree with Melmac, the WAN port connected to a cheap CSU/DSU has proved to be a wonderful solution for our SCNs. The only issue That I have seen is with WAN 3 units, which you do not need.

 

[digiandy]

Great, I'll do it that way then. Thanks for your quick responses!

 

[mforrence]

I believe that in using the WAN scenario, both systems will also require VCM resources. Using the T1 trunk card, all voice is TDM and no VCM is required. Something to keep in mind...
MIKE

 

[kflounders]

True, if you are going to link the systems without SCN and only use the TDM for Qsig, then you will not need the VCMs.

 

[digiandy]

I am sorry, I see it all the time on the forum, but what is SCN?

And what does using TDM for Qsig mean.

Also would it still carry data?

Sorry for the stupid questions, I am new to ip telephony.

Thanks

 

[big70]

time-division multiplexing

Time-division multiplexing (TDM) is a method of putting multiple data streams in a single signal by separating the signal into many segments, each having a very short duration. Each individual data stream is reassembled at the receiving end based on the timing.
The circuit that combines signals at the source (transmitting) end of a communications link is known as a multiplexer. It accepts the input from each individual end user, breaks each signal into segments, and assigns the segments to the composite signal in a rotating, repeating sequence. The composite signal thus contains data from multiple senders. At the other end of the long-distance cable, the individual signals are separated out by means of a circuit called a demultiplexer, and routed to the proper end users. A two-way communications circuit requires a multiplexer/demultiplexer at each end of the long-distance, high-bandwidth cable.

If many signals must be sent along a single long-distance line, careful engineering is required to ensure that the system will perform properly. An asset of TDM is its flexibility. The scheme allows for variation in the number of signals being sent along the line, and constantly adjusts the time intervals to make optimum use of the available bandwidth. The Internet is a classic example of a communications network in which the volume of traffic can change drastically from hour to hour. In some systems, a different scheme, known as frequency-division multiplexing (FDM), is preferred.




QSIG

Short for [Q (point of the ISDN model) Signaling].
QSIG is a common channel signaling protocol based on ISDN Q.931 standards and used by many digital PBXs. QSIG is used for the establishment and release of calls and for the control of a large number of features.


Voice Networking:

Also known as "Small Community Networking". This option enables extension number sharing with the remote IP Office system. Extensions on the remote system can then be dialed from the local system.

Note: This requires that extension numbers and names on the two systems are unique. Line and group extension numbers are not shared. Remote extension numbers cannot be included in local groups.

Full operation requires H450 Support to be enabled over the links used.




Greets Peter

 

[SuperJenks]

scn- small community networking

tdm- time division multiplexing

Qsig- ISDN based protocol for signalling between nodes on a PISN (Private Integrated Services Network)