A900-IMA8D= Cisco ASR 900 8-Port T1/E1 Interface Module Expansion Module 16 ports

Cisco ASR 900 8-Port T1/E1 Interface Module Expansion Module 16 ports. Tis modules also provide time-stamping functions for the IEEE 1588-2008 protocol. These time stamps help ensure that ASR 900 series routers achieve outstanding results when deploying IEEE 1588-2008 protocols for frequency and phase synchronization. Not all customers will deploy IEEE 1588-2008 for synchronization. Therefore, the Ethernet interface modules also support input and output frequency synchronization using synchronous Ethernet (SyncE).