A cable connector module includes a cable card assembly including a circuit card, cables terminated to the circuit card, and a cable holder coupled to the circuit card and holding the cables relative to the circuit card. The cables include cable conductors electrically connected to corresponding cable contacts of the circuit card. The cable holder holds each of the contacts and includes a connecting tab coupled to the circuit card. The circuit card includes front and rear retaining tabs. The cable connector module includes a connector shell having a cavity that receives the cable card assembly. The connector shell includes a front retainer at the front receiving the front retaining tab to hold the front of the circuit card relative to the connector shell. The connector shell includes a rear retainer at the rear receiving the rear retaining tab to hold the rear of the circuit card relative to the connector shell.