73D2248A 반도체 회로 부품 판매점
(73D2248A / 73D2348A) MNP5 / V.42bis Datacom Modem Device Set
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 TDK Electronics |
DESCRIPTION
The 73D2248A/2348A Device Sets consists of two
CMOS integrated circuits which provide the data
pump and protocol functions required to implement a
high performance 2400 bit/s modem with error
control and data compression. The 73D2248A basic
modem function is provided by the 73K224L modem
chip and is compatible with CCITT V.21, V.22,
V.22bis and Bell 103 and 212A protocols. The error
control functions are provided by modular software
running in the 73M2910 controller. Modules are
available for MNP4, and V.42. Compression
software modules can be added to the controller;
MNP5 and V.42bis are available. Provisions for
customization of the command set are provided,
forming the basis for an international modem.
The 73D2348 differs from the 73D2248A in that it
uses the 73K324L instead of the 73K224L for the
data pump. The 73K324L replaces the Bell 103, 300
bps (bit/s) FSK mode of operation, with the CCITT
V.23, 1200 bps (bit/s) FSK mode. The software is
also modified to support V.23. The two products are
otherwise identical.
73D2248A/2348A
MNP5, V.42bis Datacom
Modem Device Set
FEATURES
April 2000
• Combines modem and protocol controller
• Supports 0 - 300, 1200 and 2400 bit/s with both
sync and async modes
• Modular software design allows customization
• Modem protocols:
• Bell 103 (73K224L), 212A
• CCITT V.21, V.22, V.22bis, V.23 (73K324L)
• Error control/compression protocols Available:
MNP4, MNP5, CCITT V.42, V.42bis
• Supports non-volatile memory to store user
configurations and phone numbers
• CMOS design for low power consumption
MNP5, V.42bis Datacom
Modem Device Set
73M2910L
Controller
8 73K224L/324L
Modem
HYBRID/
DAA
16
STATIC
RAM
32K x 8
16
ROM
64K x 8
TSC 73D2248
NV
RAM
93C66
RECOMMENDED
SUPPORT
73D2248A/2348A
MNP5, V.42bis Datacom
Modem Device Set
FUNCTIONAL DESCRIPTION
The 73D2248A/2348A device set forms the basis for
an international modem design incorporating the
most advanced error control and compression
algorithms. The set consists of two chips, the
73K224L (73K324L) modem and the 73M2910
controller. Customization of the controller is one of
the features of this device set; software modules
allow the modem vendor to provide a range of
features from a standard hardware platform.
The 73K224L (73K324L) provides the QAM, PSK
and FSK modulator and demodulator functions, call
progress and handshake tone monitors, test modes
and a tone generator capable of producing DTMF,
answer and CCITT guardtones. This single-chip
modem supports the V.22bis, V.22, V.21 and Bell
103/CCITT V.23/212A operating protocols in both
sync and async modes. Low level functions of the
controller provide for automatic detection of DTE
speed, auto-dial, auto-answer, handshake with
fallback and call progress detection.
The 73M2910 controller handles both the low level
modem functions as well as protocol negotiation and
protocol operation. Software modules can be
chosen to provide the desired protocols for product
customization and differentiation. In addition, the
“AT” command set source code will be available for
those desiring to provide unique or country
dependent features.
Basic capabilities of the modem are those found in
the 73K224L (73K324L) single-chip modem and are
listed in the separate 73K224L (73K324L) data
sheet.
AUTOMATIC HANDSHAKE
The 73D2248A/2348A will automatically perform a
complete handshake with a called or calling modem
and enter the data transfer mode. After the link
between the two modems has been established, the
modems may remain in the normal data mode or
negotiate a link which has error control and data
compression. Commands are provided to inform the
modem which action is appropriate.
TEST MODES
The 73D2248A/2348A device set has provisions for
three test modes: analog loopback, digital loopback
and remote digital loopback. Analog loopback
allows data to be sent into the local modem, have it
modulated and then demodulated and returned to
the local terminal. Digital loopback requires the
cooperation of the user at the remote end and allows
data to be sent to the remote modem, demodulated,
then remodulated and returned to the local end.
Remote digital loopback allows the same capability,
without the need for a remote operator; signals are
sent to the remote modem which perform the
switching task that a remote operator would have
done.
AT COMMAND INTERPRETER
The 73D2248A/2348A includes an AT Command
Interpreter which is a superset of the Hayes 2400
Smartmodem™ command set. Common application
software will be able to control the modem though
this interpreter. Additional commands have been
added to provide for control of the MNP and CCITT
V.42 modes.
NON-VOLATILE MEMORY
A serial NVRAM provides 256 bytes of storage for
configuration information and telephone numbers.
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