The Cisco AS5800 accommodates a maximum of 10 DMM cards. Each DMM card contains 12 DMM SIMMS. Each DMM SIMM contains 12 digital modems. Since there are 12 DMMs on each DMM modem card, each card can support a maximum of 144 modems. DMM cards can be found in slots numbered 0 through 11 on the dial shelf backplane.