DUAL MAU This Dual MAU provides redundancy connectivity between adjacent pairs of redundant Call Processing cards. This Dual MAU is mandatory if Call Processing 1+1 hot redundancy is to be used on the Call Processing cards, available in R4.0 and later. Th

DUAL MAU This Dual MAU provides redundancy connectivity between adjacent pairs of redundant Call Processing cards. This Dual MAU is mandatory if Call Processing 1+1 hot redundancy is to be used on the Call Processing cards, available in R4.0 and later. The Dual MAU is not required (for either warm or hot redundancy) with the Integrated CallP/PNNI system configuration. The IP Services Card (ISC - 90-6184-xx) uses the same Dual MAU. The Dual MAU is mandatory to interconnect two adjacent ISC's running in 1+1 Redundancy mode, available in R4.2 and later. If the MAU is missing, the working card becomes active and the secondary ISC card is neither active nor providing redundancy.