Exhibit 4.1 AMENDMENT ("Amendment") dated as of May 22, 2001 between FIBERNET TELECOM GROUP, INC. ("Company"), SIGNAL EQUITY PARTNERS, L.P. (formerly known as Signal Capital Partners, L.P.), as the Majority in Interest of the Purchasers ("Signal"),...Fibernet Telecom Group Inc\ • May 23rd, 2001 • Telephone communications (no radiotelephone) • New York
