WILMINGTON, Del. - The federal bankruptcy judge presiding over the case of Nortel Networks Inc. on May 7 called "frivolous" the appeal lodged by the joint administrators of the bankruptcy estate pertaining to the allocation of $7.5 billion in assets. Specifically, the bankruptcy judge said that arbitration, which the joint administrators sought to compel, was not warranted (In Re: Nortel Networks Inc., No. 09-10138, Chapter 11, D. Del. Bkcy.).