When is a DMARC extension required?

From Bandipedia

When a buyer orders a T1 from an ISP, they are ordering two services: a port and a T1 loop. The port is the actual transport on the ISP’s backbone which gives Internet access. The loop is the private line that connects the buyer’s premise of install with the ISP’s port. The loop is actually purchased from the local exchange carrier as they are the legal entity that owns and can sell the local network. The LEC is mandated by law to deliver a local loop to the MPOE of a building being serviced by an ISP. This means that they have to bring copper to the main telecom room of a building and no further. If the terminating router of the T1 is not housed in the same room as the MPOE, then an extended DMARC will be needed. The LEC will typically make a judgment call on whether or not to extend the DMARC at no cost, based on the complexity of the extension and will often extend a DMARC to a suite if the work is not too complicated. An example of "not too complicated" is when the cat-5 cabling is already in place and available to use and the extension is basically just installing a new RJ-48 jack in the suite where service is delivered and making the connection from the MPOE to the new DMARC. However, if the LEC completes a site survey and finds that an extension will require pulling wire through walls, up floors, around critical electrical components and generally more work than they care to do with their busy schedule, they will most likely punt on the extension and drop the loop at the MPOE. They will then offer to build the extended DMARC at the expense of the buyer.

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