T1 short-haul vs. long-haul

Bruce Pinsky bep at whack.org
Thu Jul 22 17:46:36 UTC 2004


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Michel Py wrote:

|>What is the "demarc"?
|
|
| The demarc is the service demarcation. On your side of the demarc,
| things are your responsibility. On the telco side of the demarc, it's
| your provider and/or the LEC responsibility.
|
| http://192.20.13.157/planner/tab003a.pdf look at figure 1
| http://192.20.13.157/planner/tab003b.pdf look at figure 1
| http://192.20.13.157/planner/ip.html
| [note: this is for AT&T, but other carriers are similar]
|
|
|>Is it the jack/punch-block where the SmartJack is connected to?
|
|
| Maybe, maybe not.
|
|
|
|>What is an "MPOE"?
|
|
| Minimum Point Of Entry. That's where the LEC brings the cables from the
| street into the building. Unless you own the entire building, this
| typically is a closet (on the first floor, no temperature control) that
| the building manager and/or every tenant will have access to and that is
| not located in your office.
|
|
|>What is the "NIU"?
|
|
| The box that converts the signal from the street (that can run for
| miles) into the signal you find on the smartjack (that can only go a few
| hundred feet). Although I don't like the term, it's some kind of a
| digital modem. The smartjack is dumb (no lights); the NIU is the brains
| of the smartjack, what has the lights and can be looped.
|
|
|>Where is the SmartJack normally located? In your offices
|>or somewhere else in the building (maybe some room where
|>the cable to the CO is terminated)?
|
|
| - If you don't ask for extended demarc, it will be located in the MPOE
| room.
|
| - If you do ask for extended demarc (which I strongly recommend), either
| the smart jack will remain in the MPOE and your provider will bring a
| router (which becomes the demarc) in your office, or your provider will
| extend the smartjack (which will remains the demarc) in your office.
| Whether or not they move the NIU (which is preferred since you can look
| at the lights but will be difficult) or only move the jack itself is not
| your problem, all you really care is that they move their responsibility
| line, the demarc. You want the location of the demarc in WRITING.
|
| What you want is your provider to be responsible for the circuit coming
| into YOUR office, not the building. If you don't have this, you will get
| that:
|

It is also worth noting that in some buildings, the owners or management
group will not allow the telco or provider to extend the demarc.  This is
particularly true in multi-story and high-rises in metro areas where they
want to control access to the building risers.  This allows them to make
money off bringing the circuit from the MPOE to the wiring closet on your
floor. Of course they typically hire a company that does that so you have
yet another player involved in troubleshooting a faulty circuit and
coordination during install.

- --
=========
bep

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