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ISDN U refernce point
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| Bernie 2001-03-18, 2:19 pm |
| This reference point runs in b/t NT1 and line-termination equip in a carrier network. What is an example of line-termination equip? | |
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| I never touched ISDN things, so don't take my word for it...  I would say the "line-termination equipment" is a phone jack in the wall.
Any ISDN guru here?! | |
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| Thanks for answering both my questions Dan. If I feel comfortable, I'm hoping to take the test in two weeks. I know I'm going to need your help. | |
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| I know you're going to pass!  | |
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| quote:
Originally posted by Bernie
This reference point runs in b/t NT1 and line-termination equip in a carrier network. What is an example of line-termination equip?
I am not an ISDN guru, but I'll give you my version anyway:
The U reference point is the two-wire (one pair) that goes between the CO (somewhere in town) and the NT1 (in your building). It could be your old analog phone connection that is now converted to ISDN. I do not know the exact nature of the termination equipment they use at the CO, but it should be able to set up and tear down connections as well as multiplex many ISDN lines onto trunk lines.
Contrast the U interface to the S/T interfaces which only span short distances (<100 meters) and use 2 pair (one for receive and the other for transmit).
HTHaL (hope this helps a little)
Terje | |
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| Howdy Terje ... long time no IOS reload!
The ISDN termination in the U.S. is almost always an RJ-48 jack (same size/wires as RJ-45, but I believe with some shielding). "Line Termination" is generally telco talk for the demarc. As Terje notes, how it is all crosconnected at the CO is anyone's guess.
HTH,
doctorcisco |
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