The Sanhui SHT-2B/USB and SHT-4B/USB USB voice boxes hardware manual provides overview, installation steps, specifications, and driver information.
The CTI series SHT-2B/USB and SHT-4B/USB are USB 1.1 analog telephone line voice boxes that can be configured for virtual phones, seat agents, and external line access. They include built‑in power amplifiers, speaker outputs, line voltage detection, and support multiple audio codecs and four full‑duplex channels.
The manual details external hardware layout, label meanings, system requirements, and step‑by‑step installation, including connecting the RJ11 line, microphone/handset, power, and USB cable. Appendices list the main technical parameters and contact information for technical support. This manual is written in Chinese.
| Dimensions | 170 × 130 × 20 mm |
|---|---|
| Weight | ≈200 g (without power supply) |
| Operating Temperature | 0 °C – 55 °C |
| Storage Temperature | -20 °C – 85 °C |
| USB Interface | USB 1.1 |
| Audio Output Power | ≥50 mW (headphone drive) |
| Signal‑to‑Noise Ratio | ≥42 dB |
| Maximum Simultaneous Devices | 8 devices, each up to 4 channels |
| Supported Audio Codecs | G711 A‑Law, μ‑Law, Linear PCM, IMA‑ADPCM, MP3, VOX, WAV |
Up to eight USB voice boxes can run simultaneously, each providing up to four channels.
It supports G711 A‑Law, μ‑Law, Linear PCM, IMA‑ADPCM, MP3, VOX and standard WAV files.