1 EXHIBIT 10.18 GUARANTY For value received, Verilink Corporation, a Delaware corporation, hereby guarantees the performance by Baytech Associates, a California general partnership ("Baytech") of Baytech's obligations under the Lease between Baytech and IDEC Corporation of 161 Nortech Parkway, San Jose, California, dated September 30, 1996. Dated: September 30, 1996 VERILINK CORPORATION By: [SIG] ------------------------ Title: President ---------------------