Electronic Design

Wireless Network Software Supports PHS Voice, Data

The PHS Internet Access Forum Standard (PIAFS) software supports voice and data transmission over the wireless Personal Handy-phone Service (PHS). Together with the company's universal access modules, this software makes it easy to add high-quality voice and high-speed data services to PHS basestations.

PHS is a wireless access service for local-loop and mobile applications. It provides high-speed wireless data service at 64 kbits/s. Designers can expect 128-, 256-, and 384-kbit/s services in the near future.

PIAFS software is available on the MTN1024 palm-sized, 24-port universal access module. It also is available on a 120-port PCI card and the MTN5000 168-port CompactPCI card. Additionally, Mapletree offers a manufacturing and licensing kit (800 series) that gives OEMs all the hardware and software documentation needed to integrate the company's modules into a custom network access system.

UniPorte platforms with Mapletree's PIAFS software implement all the bit-stream frame processing and data-link processing functions required to process PHS data calls (one per port) at speeds up to 64 kbits/s. These include octet alignment, rate adaptation, frame synchronization, deframing, framing, CRC generation and verification, selective-reject error correction, and protocol control. Higher throughputs can be achieved (200 to 300 kbits/s) by ITU-T V.42bis compression with PIAFS error correction.

Voice support includes voice coding per ITU G.711, G.723.1, G.729A, and G.729B standards; echo cancellation per ITU G.165 and G.168 standards; voice-activity detection; jitter buffer management and playback; and RTP, RTCP, and DTMF relay support. Fax support includes ITU-T V.17, V.29, V.27ter, T30, Class 2 and Class 2.0, and T.38 standards. Data-compression support includes MNP5 and V.42bis standards.

Furthermore, the UniPorte architecture supports VoDSL, V.90 modems, and all lower-speed modem modulations. All UniPorte ports can automatically detect the type of incoming call—such as voice, PIAFS data, or fax—and dynamically configure themselves to handle that call.

The Series 800 kit, including PIAFS software, is available immediately. It can be licensed on a per-port basis, starting at $18.00 per port in large volumes, depending on functionality.

Mapletree Networks Inc., 315 Norwood Park South, Norwood, MA 02062; (781) 751-2400; fax (781) 751-2470; www.mapletree.com.

TAGS: Mobile
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