BUS:

Base + Remora up to 6 ports (PCI Express)

BUS:

Base + Remora + HW echo cancel

BUS:

Base + Remora + HW echo cancel (PCI Express)

BUS:

2 port BRI module (4B's, 2D's)

BUS:

2 port BRI module (4Bs, 2Ds)

BUS:

2 Connector Backplane (up to 12 Ports)

BUS:

3 Connector Backplane (upto 18 Ports)

BUS:

4 Connector Backplane (upto 24 Ports)