1 EXHIBIT 4.3 GUARANTEE OF PREFERRED SECURITIES GUARANTEE GUARANTEE OF PREFERRED SECURITIES GUARANTEE (this "Agreement"), dated as of March 21, 2000, among AT&T Broadband, LLC, a Delaware limited liability company (the "Original Guarantor"), AT&T...Preferred Securities Guarantee • March 27th, 2000 • At&t Broadband LLC • Telephone communications (no radiotelephone) • New York
