536EPXX — Host Accelerated Modem 56K V.92 Chipset
22
Intel Confidential
PreliminaryDatasheet
7.0
Modes of Operation
The 536EPXX chipset family provides complete modem functions for the following modes: Group
3 Fax, Data, IS-101 Voice, V.42/MNP 2–4 (Microcom Networking Protocol Classes 2 through 4),
Error correction, V.44, V.42 bis/MNP 5 (Microcom Networking Protocol Class 5), and
Videoconferencing. Each mode has its own unique AT command set. The data rates and
modulation schemes for Data and Fax modes are presented in
Table 15 on page 25
. Additionally,
special modes of operation exist for power management and loopback testing.
7.1
Modes
7.1.1
Data Mode
In data mode, the 536EPXX chipsets send at an effective rate of 33.6 kbps and receive at
53.333 kbps using ITU-V.92. The 56K receive rates can be achieved only in connections with
equipment-compatible ISPs (internet service providers). See
Table 15 on page 25
for connection
rates. Both chipset families implement all data rates and modulation schemes for ITU-T
(International Telecommunications Union—Telecommunications) standards V.34, V.32 bis, V.32,
V.22 bis, V.22, V.21, and Bell 212A, Bell 103. Both families implement a standard (TIES) Data
mode AT command set, which is compatible with any communication application software that
supports the Hayes* AT command set.
7.1.2
Fax Mode
In fax mode, the chipsets operate at up to 14.4 kbps (transmit and receive) and implement all the
data rates and modulation schemes for ITU-T standards V.17, V.29, V.27 ter, and V.21 ch2. The
chipsets implement a standard Fax mode AT command set compatible with any communication
application software that supports EIA/TIA-578 Fax Class 1 standards.
7.1.3
Voice Mode
All chipsets support Telephone-Emulation mode, IS-101 voice commands, and record and
playback message capabilities. Telephone-Emulation mode allows a handset/microphone-speaker
and modem to be used as a complete telephone. In Telephone-Emulation mode, the received data
from the AFE (MD1724) microphone interface is looped back to the AFE analog transmit pins. In
voice mode, the message record and playback abilities are accessed by the extended IS-101 AT
commands.
7.1.4
Error Correction and Data Compression Modes
The Intel platform supports error correction (V.42/MNP 2–4) and data compression (V.44 and
V.42 bis/MNP 5). Error correction ensures error-free data transfer. Data compression substantially
increases the modem data throughput over the basic data rate throughput. Depending on the data
stream, MNP 5 can provide compression ratios of up to two-to-one. Alternately, ITU-T V.44 can
provide up to 25% more compression then the V.42 bis.
