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Description
General
The RH56D-PCI modem provides the processing core for
a complete system design featuring data/fax modem,
voice/TAM, and speakerphone support, depending on
specific model (Table 1).
Note:
The term, “RH56D-PCI Device Set”, refers to the
family of modem models listed in Table 1.
Modem operation, including dialing, call progress,
telephone line interface, telephone handset interface,
audio interface, and host interface functions are supported
and controlled through the command set.
The modem hardware connects to the host processor via
a PCI Bus interface. The OEM adds a crystal circuit,
EEPROM, telephone line interface, telephone handset
interface (optional), and audio interface (optional) to
complete the system.
Host Modem Software
The host 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.
Modem data pump control. Binary executable code
controlling MDP operation is downloaded as required
during operation.
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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 (4-bit IMA)
coding is also supported to meet Microsoft WHQL logo
requirements.
Voice/TAM Mode is supported by three submodes:
1.
2.
Online Voice Command Mode supports connection to
the telephone line or, for the SP model, a handset.
Voice Receive Mode supports recording voice or
audio data input at the RIN pin, typically from the
telephone line or, for the SP model, a
microphone/handset.
Voice Transmit Mode supports playback of voice or
audio data to the TXA1/TXA2 output, typically to the
telephone line or, for the SP model, a
speaker/handset.
2.
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 lower 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
3.
Speakerphone Mode (SP Model)
The SP model includes additional telephone handset,
external microphone, and external speaker interfaces
which support voice and full-duplex speakerphone (FDSP)
operation.
Hands-free full-duplex telephone operation is supported in
Speakerphone Mode under host control. 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
host can separately control volume, muting, and AGC in
microphone and speaker channels.
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