HP J3103-69001 - AdvanceStack expansion module assembly - Has two empty bays for optional 100VG tansceivers - (J3103A) Retail
HP J3246-69001 - AdvanceStack expansion module assembly ATM uplink module - Has one ATM OC-3 uplink with physical backup for the Switch 2000A and Switch 2000B - (J3246A) Retail