Exhibit 10.19 Sycamore Networks, Inc. MANUFACTURING SERVICES AGREEMENT 1.0 GENERAL SCOPE This Manufacturing Services Agreement is entered into by and between Sycamore Networks Inc. (Sycamore), 10 Elizabeth Drive, Chelmsford, Massachusetts 01824 and...Manufacturing Services Agreement • June 12th, 2001 • Sycamore Networks Inc • Telephone & telegraph apparatus • Massachusetts
