The A400 Series is the high density version of the popular A200 series analog cards.
Identical in operation and configuration, and using the same FXO and FXS modules, the A400 system supports twelve ports per main board and REMORA, as compared to four ports for the A200.
The 12 port A400 base card supports upto one additional REMORA card. A single PCI or PCI Express slot host connection can support up to 24 FXO/FXS ports with common synchronous clocking for all channels.
You can add a maximum of 1 slave card to the existing Sangoma Card providing a total of 12 modules (24 ports)
The Slave REMORA card supports 6 modules (12 ports).