LMP Nbr discovey

Hi all,
                    With respect to the following picture can someone tell
me how TNE 1 can discover
    and correlate its Data Link if it doesn't know where its TE link
(indicated with a, b, c and d) are attached?
   Letters indicates TE link ID, each TE link is made of one or more Data
Links.

                     +-----------+
                     |           |
                     |           |
                     |    2      |
                     |           |
                     +--a------b-+
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                     +--a------b-+
                     |           |
                     |           |
                     |    1      |
                     |           |
                     +--c------d-+
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                      |  |   |  |
                     +--c------d-+
                     |           |
                     |           |
                     |    3      |
                     |           |
                     +-----------+

Regrads, Diego