Digital telephony is used in the provision of digital telephone services and systems. The upper end of this software can provide a V.110, V.120, V.14, HDLC, or a direct binary framing layer. V.110 is a rate adaptation standard which defines how data terminal equipment (DTE) with asynchronous or synchronous serial interfaces can be supported on an ISDN network through a bit-by-bit alignment between the DTE and the ISDN B channel. V.120 is used to synchronize data streams in North America between a telephony network and asynchronous devices, such as a serial UART.
VOCAL’s embedded software libraries include a complete range of ETSI / ITU / IEEE compliant algorithms, in addition to many other standard and proprietary algorithms. Our software is optimized for execution on ANSI C and leading DSP architectures (TI, ADI, AMD, ARM, MIPS, CEVA, LSI Logic ZSP, etc.). These libraries are modular and can be executed as a single task under a variety of operating systems or standalone with its own microkernel.
Telephony Signaling
- MF Generation/Detection
- MF R2 Compelled/Semi-Compelled Signaling
- MF R1 Signaling
- TIA 468A DTMF Signaling
- Bellcore Interoffice Signaling
- Q.921 LAPD Protocol
- Q.922 LAPF Protocol
- Q.931 ISDN Call Signaling
- Q.932 Frame Relay Call Signaling
Framing Layers
- ISDN Interface
- V.110 Rate Adaptation
- V.120 Rate Adaptation
- HDLC B Channel (7 or 8 bit)
Features
- IO/M-2/GCI/ST Frame Assembly/Disassembly
- IO/M-2/GCI/ST 2B + D Multiplexing
- V.110 Rate Adaptation
- Bonding implementation of 2 or 6 B channels for 128 to 384 kbps aggregate throughput
- Q.921 LAPD Data Protocol Optional
- Q.931 Call Control Optional
- Q.922/Q.932 Switch Circuit Frame Relay Optional
- U.S. National ISDN Call Control Optional
- Modular software suite available with controller code
- Optimized for high performance on leading edge DSP architectures
- Multi-tasking environment compatible
Configurations
- V.110, V.120, V.14, HDLC and direct binary framing layer
- Can be combined with analog data modulations (V.90, V.34, V.32bis et al.)
- Can be combined with analog facsimile modulations (V.34fax, V.17 et al.) and protocols (T.30)
- Can be combined with analog telephony functions including speakerphone
- Compatible with Siemens, Motorola and National U interface chips
- Frame Relay/PPP Terminal adapter