CX11250 Ver la hoja de datos (PDF) - Unspecified

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CX11250

SmartHSF™ Mobile Modem

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SmartHSF Mobile Modem Data Sheet

1.3.3 Operating Modes

Data/Fax Modes

In V.90/K56flex data modem mode, the modem can receive data from a digital source using a V.90- or K56flex-compatible

central site modem at line speeds up to 56 kbps. Asymmetrical data transmission supports sending data at line speeds up to

V.34 rates. This mode can fallback to full-duplex V.34 mode, and to lower rates, as dictated by line conditions.

In V.34 data modem mode, 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 V.32 bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.

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, and 2400 bps. Fax data transmission and reception performed

by the modem are controlled and monitored through the EIA/TIA-578 Class 1 or T.31 Class 1.0 command interface. Full

HDLC formatting, zero insertion/deletion, and CRC generation/checking are provided.

Synchronous Access Mode - Video Conferencing

V.80 Synchronous Access Mode (SAM) 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.

TAM Mode

TAM Mode features include 8-bit µ-Law, A-Law, and linear coding at 8 kHz sample rate. Full-duplex voice supports concurrent

voice receive and transmit. Tone detection/generation, call discrimination, and concurrent DTMF detection are also

supported. This mode supports applications such as digital TAM, voice annotation, and recording from and playback to the

telephone line. ADPCM (4-bit IMA) coding is also supported to meet Microsoft WHQL logo requirements.

TAM Mode is supported by three submodes:

1. Online Voice Command Mode supports connection to the telephone line or, for S models, a

microphone/speaker/handset/headset.

2. Voice Receive Mode supports recording voice or audio data input from the telephone line or, for S models, a

microphone/handset/headset.

3. Voice Transmit Mode supports playback of voice or audio data to the telephone line or, for S models, a

speaker/handset/headset.

Voice/Speakerphone Mode (S Models)

The S models include 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.

NOTE: Because some cellular interface signals and CX20437 VC interface signals share the same CX11250 HSD pins,

speakerphone configuration does not support the cellular interface.

Personal Digital Cellular High Speed Mode (C Models)

Personal Digital Cellular (PDC) High Speed Mode, implemented in host software, includes V.42 bis data compression and

ARQ framing. A pass-through mode is also available to allow phone book data to be transferred to and from the PC at speeds

up to 9600 bps (e.g., for editing on the PC). PDC High Speed Mode is enabled by the +WS46=20 and +CPDCM=2 AT

commands and disabled by the +WS46=1 AT command.

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