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I'm LOST when it comes to ISDN's

I'm LOST when it comes to ISDN's

(OP)
Although I've been programming in Nortel systems for a long time, I'm somewhat lost when it comes to configuring ISDN's. My limited knowledge might be enough to be dangerous but I just don't understand entirely what I am doing. Here are my questions for anyone who can answer:  

1) What are the TSP's? How many USERID can I have? Do TSP's separate ISDN services entirely?  In other words, if two users wanted one ISDN line/service each, can I program two TSP's on the same DSL, separating the services for two different users or are the TSP connected somehow?
2) In LD 27, do I need (1) DSL built to every TSP userID?  
3) Can I build a TSP on an existing configured DSL to provide another ISDN service for someone totally separate from any other ISDN service?
4  Why two numbers for TSP? Do they have to be two DID numbers?
5) RE: Wiring - when would I use 2-wire vs 4-wire?  Is that a specification for the equipment manufacturer?
6) Are the SILC cards for 4-wire and UILC cards for 2-wire?

Some of my questions may be asking the same thing and if so, I apologize for being redundant. Any insight to this would be much appreciated!

RE: I'm LOST when it comes to ISDN's

Well, I am not an expert from the switch end of things, but I can answer some of your questions.

One DSL per subscriber.

Each DSL can, at least in theory, support up to 8 terminals. Not sure how this correlates exactly to TSPs, and most switches do not support 8 terminals.

In reality, in the USA, 2 wire is used from the switch to the prem and 4 wires is used from the network termination unit (NT1) to the terminal. However many terminals support 2 wires with the NT1 internal. In most cases those device cannot share a DSL with another terminal

(unless they are clever and break out the 4 wire outsid ethe terminal. In that case a 2 wire terminal's NT1 could be shared with up to 7 other 4-wire terminals)

One and only one NT1 per 2 wire circuit.

Up to 8 terminals (at least in theory) can share the 4-wire circuit.

2 Wire good for up to 18k ft.

4-wire good to a maximum of 1 kft (best case, with several limiations.

Each DSL includes 2 DS0s ("B-channel") and can therefore support 2 simultaneous circuit switched calls.

Each DS0 can support circuit switched voice, circuit switched data, or both types of calls.

Terminals may support 1 or 2 B channel operation.

Nortel switches support "DMS Custom" and/or "National ISDN-1" and/or "National ISDN-2" D channel protocol. Not all terminals support all available protocols.

I hope this helps :)

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