This diagram shows that there may be multiple carrier suppliers of a particular "loop" and the same or different multiple carrier suppliers of transport circuits that connect the loop to a network. The relationships are
First level - An image of a building representing a CLEC Customer Office Building. Line extending from CLEC Customer Office Building is called an SBC Loop (Circuit A) connecting to SBC Equipment enclosed in a rectangle box.
Second level - SBC Transport (Circuit B) extends down from SBC Equipment box and connects to SBC/AT&T Equipment enclosed in a rectangle box. Extending down from the SBC/AT&T Equipment box are two diagonal lines (one to the left, one to the right) representing loops connecting two buildings. From the right of the SBC/AT&T Equipment box are two lines --an SBC Transport (on top) and an AT&T Transport (underneath) – with arrows indicating traffic flows in both directions connecting to an SBC/AT&T Equipment box and the SBC/AT&T/CLEC Equipment box enclosed in a rectangle box (Circuit C). Connecting from the top of the SBC/AT&T/CLEC Equipment box is an arrow pointing upwards with the label To CLEC Network. From the bottom of the SBC/AT&T/CLEC Equipment box is a line representing a loop connecting to one building. Connecting to the right of the SBC/AT&T/CLEC Equipment box is an arrow pointing to the right with the label To SBC and AT&T Networks.
Diagram key is in upper right hand corner stating, A CLEC might buy Local Private Line including either Circuit A and Circuit B or Circuit A and Circuit B and Circuit C.
Updated August 14, 2015