HP J2607-61001 - EtherTwist transceiver module - Has one RJ-45 connector (10Base-T port) - (J2607A) Retail
HP J2611-69001 - AdvanceStack hub assembly - Has 16 (F) RJ-45 connectors (10Base-T ports) and a transceiver module slot - (Part of J2611A) Retail