Complete Communications Engineering

analog modem adapter
AMA enables analog modem over IP network communications

An Analog Modem  Adapter (AMA) replaces expensive (and rapidly vanishing) PSTN connections to enable analog modems to transmit data over IP networks. With the imminence of FCC Forbearance Order 19-72A1, as of August 2nd 2022, telecom carriers will no longer be required to maintain or repair their copper POTS infrastructure. The AMA connects legacy POS, telemetry devices/modems, fax and other analog devices to IP networks including mobile, radio, and satellite (Iridium, etc) networks.

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What is an Analog Modem Adapter?

An analog modem adapter (AMA) is a device that enables a physical voice-band dial-up modem, that would normally connect to a telephone line, to instead connect directly to an IP network. An AMA locally demodulates the modem audio and extracts the data stream. This data stream is sent over a secure TCP/IP connection where it can either be remodulated to communicate with another modem endpoint or it can be directly consumed by a backed data processing system.

Analog Modem Adapter

An AMA, similar to an Analog Telephone Adapter (ATA), provides a modular phone jack (FXS port) and an Ethernet port. An analog device can be connected to the modular jack to transmit its data over IP networks eliminating the need for telephone landline connections. An AMA supports telephony features such as dial tone, device power, ringing and standard telephone signaling to communicate with the local modem.

Initially the ATA was developed to connect analog telephones to digital networks, but AMAs have since evolved to support POS, telemetry, fax and many other dial-up applications. Depending on the transport mechanism, the AMA can be used to communicate over an IP network with a modem server, VoIP server or directly with another AMA endpoint.

Large numbers of legacy analog modem devices are still used in retail, industrial and other applications to transmit information to dial-up remote server gateways over traditional telephone land lines. Contact us to discuss your modem application requirements.

Alarm Over IP (Optional)

Alarm panels use multiple communications methods including DTMF, tonal and low speed modems (actually some use V.32/V.34 modems while most simply use FSK Bell 102 for V.21). VOCAL’s AMA may be optionally configured to support alarm panel operations with AT command set support for precise tone generators and detectors and automation for SIA transactions.

Point-of-Sale Over IP  (Optional)

The AMA supports for Point-of-Sale (POS) terminals which use typically V.22 modems with a quick connect process (used by Veriphone) to send ASYNC or HDLC framed data. VOCAL supports all common non-standard methods for POS applications including byte timing in both the AMA and SAMS configurations. 


AMA Software

VOCAL’s AMA software data modulations include V.34, V.90, V.92, V.32/bis, V.22/bis, V.21 and V.23. The software is part of a fully integrated and highly configurable VoIP software solution with a Network Stack, SIP Stack, secure communications, full-featured Telephony software with a comprehensive data modem software library.

VOCAL’s AMA software is modular and optimized for DSPs and conventional processors from TI, ADI and other leading vendors. Our AMA software is available for licensing as a library or a complete design with custom solutions available.

supported platforms for Analog Modem Adapter

VOCAL’s solution is available for the above platforms. Please contact us for specific supported platforms.

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