Cisco 3810 Multi service concentrator
<quote> The Cisco MC3810 is a key component of the second phase of Cisco's data/voice/video integration strategy, a five-phase systems and technology strategy designed to help users network and interoperate voice over Asynchronous Transfer Mode (ATM), voice over Frame Relay and voice over IP (see accompanying release “Cisco Delivers Second Phase of Data/Voice/Video Integration Strategy”).
The Cisco MC3810 operates in both public or private network environments to seamlessly provision networks for data, voice and video services on facilities from 56K to 2.048 megabits per second (Mbps). Service providers can deploy the Cisco MC3810 to support existing applications by offering users low-cost, multiservice Frame Relay access today, migrating their customers to T1/E1 ATM services as business applications demand. The Cisco MC3810 features compressed analog and digital voice, multiprotocol routing, legacy data support and Frame Relay-to-ATM Interworking (FRF.5) that allows carriers to deliver differentiated ATM services not typically found in today's ATM customer premises equipment (CPE). </quote>
https://www.cisco.com/c/en/us/td/docs/ios/atm/configuration/guide/atm_vatm_svc_mc3810.html