Adtran 1187562F1 TA 5000 24-Port Active Ethernet OLT 3rd generation with SFP interfaces occupies a single slot with 12 physical SFP interfaces. Each SFP interface supports 2 subscribers when used with Compact SFPs. In addition to supporting Compact SFPs, the Active Ethernet Module supports standard Bidi SFPs. ADTRAN Compact and Bidi Gigabit Ethernet SFPs must be ordered separately or as part of a bundle.