Nortel NTBB51CB 0x8 Analog Station with Message Waiting (Refurbished)The Norstar Analog Station Module with Message Waiting Indication (ASM with WMI) serves as an interface between a Norstar PLUS Modular ICS and analog devices such as FAX machines, FAX Modems, credit card verification devices, as well as analog voice equipment. The ASM is an 8 port module that connects to the Modular ICS unit via a Modular ICS Fiber Expansion Cartridge. Two ASMs may be daisy chained together and connected to a single fiber receptacle