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35 serial port
The ShoreTel SG-90 is a 1U half width switch that can fit in a ShoreTel dual rack tray
The M7324 is expandable with additional DSS / CAS add on modules
The Cisco 3620 has two slots
The 4210924L1 includes a fast Ethernet Base-T port
Cisco PVDM2 Packet Fax/Voice DSP Module Number Channels:16 35 serial portCisco PVDM2 Packet Fax Voice DSP Module Product Information: The High Density Packet Voice digital signal processor (DSP) Module (PVDM2) enables Cisco Systems Integrated Services Routers to provide high density voice connectivity, conferencing, and transcoding capabilities in Cisco IP Communications solutions. Cisco Integrated Services Routers provide enterprises and service providers with a toll bypass solution by connecting their existing telephony
