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| 型號： | RS56-PCI |
| 英文描述： | Host Software Processed V.90/K56flex Modem Device Family for Desktop Applications |
| 中文描述： | 主機軟件處理V.90/K56flex調(diào)制解調(diào)器桌面應(yīng)用器件系列 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大小： | 228K |
| 代理商： | RS56-PCI |
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Description
General
The RS56-PCI Device Sets provide the processing core
for a complete system design featuring data/fax modem,
voice/TAM, and speakerphone depending on specific
model (Table 1).
Note: The term, “SoftK56”, refers to the family of modem
models listed in Table 1.
The modem is the full-featured, self-contained data
modem, fax modem, voice/TAM, and speakerphone
(optional) solution. These functions, as well as dialing, call
progress, telephone line interface and host interface
functions are supported and controlled through the
command set.
The modem hardware connects to the host PC via a PCI
bus interface. The OEM adds a crystal circuit, telephone
line interface, telephone interface (optional), and audio
interface (optional) to complete the system.
Host-Processed Modem Software
The host-processed modem software performs two
distinct tasks:
1. General modem control, which includes command
sets, fax Class 1, voice/TAM, speakerphone, error
correction, data compression, and operating system
interface functions.
2. Modem data pump signal processing, which includes
data and facsimile modulation and demodulation, as
well as voice sample formatting.
Configurations of the modem software are provided to
support modem models listed in Table 1.
Binary executable modem software is provided for the
OEM.
Data/Fax Modes
As a V.90/K56flex data modem, the modem can receive
data from a digital source using a V.90- or K56flex-
compatible central site modem over the digital telephone
network portion of the PSTN at line speeds up to 56 kbps.
Asymmetrical data transmission supports sending data up
to V.34 rates. This mode can fallback to full-duplex V.34
mode, and to slower rates as dictated by line conditions.
As a V.34 data modem, the modem can operate in 2-wire,
full-duplex, asynchronous modes at line rates up to 33.6
kbps. Data modem modes perform complete handshake
and data rate negotiations. Using V.34 modulation to
optimize modem configuration for line conditions, the
modem can connect at the highest data rate that the
channel can support from 33600 bps down to 2400 bps
with automatic fallback. Automode operation in V.34 is
provided in accordance with PN3320 and in V.32 bis in
accordance with PN2330. All tone and pattern detection
functions required by the applicable ITU or Bell standard
are supported.
In fax modem mode, the modem can operate in 2-wire,
half-duplex, synchronous modes and can support Group 3
facsimile send and receive speeds of 14400, 12000,
9600, 7200, 4800, or 2400 bps. Fax data transmission
and reception performed by the modem are controlled and
monitored through the fax EIA/IA-578 Class 1 and T.31
Class 1.0 command interface. Full HDLC formatting, zero
insertion/deletion, and CRC generation/checking are
provided.
Synchronous Access Mode (SAM) - Video
Conferencing
V.80 synchronous access mode between the modem and
the host/DTE is provided for host-controlled
communication protocols, e.g., H.324 video conferencing
applications.
Voice-call-first (VCF) before switching to a videophone
call is also supported.
Voice/TAM Mode
Voice/TAM Mode features include 8-bit
μ
-Law, A-Law, and
linear coding at 8000 Hz and 7200 Hz sample rates. Tone
detection/generation, call discrimination, and concurrent
DTMF detection are also supported. ADPCM coding is
also supported to meet Microsoft WHQL logo
requirements.
Voice/TAM Mode is supported by three submodes:
1. Online Voice Command Mode supports connection to
the telephone line or, for SP models, a handset.
2. Voice Receive Mode supports recording voice or
audio data input at the RIN pin, typically from the
telephone line or, for SP models, a
microphone/handset.
3. Voice Transmit Mode supports playback of voice or
audio data to the TXA1/TXA2 output, typically to the
telephone line or, for SP models, a speaker/handset.
Speakerphone Mode (SP Models)
The SP model includes an additional telephone handset,
external microphone, and external speaker interface
which supports voice and full-duplex speakerphone
(FDSP) operation. The Speakerphone Mode features an
advanced proprietary speakerphone algorithm which
supports full-duplex voice conversation with acoustic, line,
and handset echo cancellation. Parameters are constantly
adjusted to maintain stability with automatic fallback from
full-duplex to pseudo-duplex operation. The
speakerphone algorithm allows position independent
placement of microphone and speaker.
The speakerphone mode provides hands-free full-duplex
telephone operation under host control. The host can
separately control volume, muting, and AGC in
microphone and speaker channels.
The speakerphone mode also supports Voice/TAM Mode
connection to a handset.
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