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Sangoma Technologies has been designing WAN and telecom/telephony hardware for over 20 years. While Sangoma is well-known as a world leader in support of ATM, Frame Relay, SS7, X.25, PPP, BiSync, HDLC, and SDLC all popular WAN-related protocols it has been quietly making inroads in providing analog and T1/E1 hardware to open source PBX solutions such as Asterisk, Yate, and FreeSwitch.
In a recent review of Sangoma's hardware, TMC's Tom Keating explained that they manufacture a range of PCI-based cards with T3/E3, T1/E1 TDM, analog voice and data, ADSL, and serial interfaces. Their cards can turn a server into a voice or data gateway, and their voice and data solutions and communications toolkits are available for all popular operating systems including Linux, Windows, Netware, FreeBSD, OpenBSD , NetBSD, SCO Unix, and Sun Solaris.
The most recent addition to Sangoma's stable of product offerings is the A108 Series of octal T1/E1 cards, designed to support high-density data and voice applications. The A108d version includes a miniature echo cancellation and voice enhancement sandwich board.
The Features of the A108 cards include:
The highest density T1/E1 PCI supporting the business, making it ideal for high-density routing and TDM voice applications, saving half the PCI slots required.
Much lower power consumption per system than comparable systems made up of less dense cards.
Optional hardware DSP on the A108d, offering G.168-2002 echo cancellation with 1024 tap/128ms tail per channel on all channel densities, DMF encoding/decoding and tone recognition and voice enhancement.
The same PCI interface, architecture and digital path as all Sangoma's AFT voice and data cards, meaning no motherboard or compatibility issues and proper handling of shared interrupts.
Round robin data buffer handling to minimize interrupts when supporting high volume/small packet data environments.
All Sangoma's voice drivers take advantage of their AFT (Advanced Flexible Telecommunication) technology to substantially reduce the processing required to handle voice calls by the host CPU. This reduces the CPU's workload; resulting in fewer dropped calls, less jitter, and better voice quality.
In his review, Keating pointed out that Sangoma also stressed a key competitive advantage in that their AFT technology enables them to not only field upgrade the device driver code, but also the card's FPGA firmware. In addition, Sangoma's cards are self-sensing for 3.3v and 5v PCI slots and software configurable for T1/E1 or J1. According to Sangoma, they share interrupts properly between themselves and other PCI compatible devices, supporting unlimited numbers of cards per PC chassis. IT
Greg Galitzine is the editorial director of Internet Telephony.
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