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I NTEGRATED C IRCUITS D IVISION
Functional Description
The CPC2400E is a small, full featured, 2400 baud
module intended for embedded applications and is
fully FCC Part 68 approved. The CPC2400E includes
a user transferable FCC registration number which
the end product must display (see section for more
details). The module consists of a Data Access
Arrangement (DAA), V.22bis data pump, and a
microcontroller on a 1.00” x 2.50” PCB.
The CPC2400E connects to the telephone lines
TIP and RING leads and must be made through an
approved RJ-11 jack. The CPC2400E supports the
industry standard AT command set (see AT Command
CPC2400E
assigns the customer a unique registration number.
No additional FCC Part 68 submittal is required for
equipment using the CPC2400E module.
2. Repairs
The FCC requires that IXYS IC Division makes
all necessary repairs to the modem. If you are
experiencing problems with the CPC2400E, call
1-800 272-5273 for further information. If repairs are
necessary after the modem has been installed in your
product and delivered to your customer, the modem
must be returned to you where the CPC2400E can be
removed and sent back to IXYS IC Division.
set section for further details).
3. Label Instructions
The CPC2400E operates off a single +5V supply
and supports low power modes of operation. When
the device is not in use, it automatically enters sleep
mode, reducing supply current to a minimum. An
incoming ring signal from the phone lines powers up
the device (wake-on ring).
An evaluation board is available for testing the
CPC2400E. This evaluation board includes an RS232
line driver, LED status indicators and an amplified
speaker circuit. When used with the evaluation
board, the CPC2400E also meets the FCC Part 15B
emissions test. Contact IXYS IC Division for more
information on the CPC2400E Evaluation Board.
DAA
The DAA portion of the CPC2400E has been
designed to interface directly with the U.S. PSTN
as governed by the FCC. The DAA includes the
circuitry for hookswitch, ring detection, gyrator, surge
protection and analog signal coupling transformer. The
DAA circuitry provides up to 1000 V rms of longitudinal
surge protection. For countries using a PSTN similar
to the U.S. (Canada, Japan), the product using the
CPC2400E must be submitted to a suitable test house
for approval. Consult IXYS IC Division for further
information.
FCC Part 68: Connecting to the PSTN
1. General
The CPC2400E complies with FCC Part 68 rules
which regulates equipment connected to the
telephone network. The CPC2400E provides a user
transferable Part 68 registration which means that
customers can use IXYS IC Division’s registration
number for the CPC2400E. Customers who wish, can
reregister the modem under their name. Reregistration
A label similar to the following should be made visible
on the outside of the end user product.
4. Design Guidelines
The following design guidelines should be followed to
insure compatibility to FCC Part 68 tests:
4.1. The CPC2400E, the RJ-11 jack and the interface
circuitry must be mounted on a PCB the should meet
UL 94V-0 flammability standard.
4.2. Tip and Ring traces from the CPC2400E to the
RJ-
11 jack should be isolated by a minimum of 1.5mm
(0.06in) to prevent breakdown. Traces must have a
minimum
width of 0.5mm (.02in).
4.3. Insure that module is securely installed to the host
system. Vibration and drop tests will loosen
components
that are not securely mounted. One of two methods
for securing the module should be used:
4.3.1 Soldered to the main PCB. This method is well
suited for harsh environments where the end product
may be subjected to shock and vibrationas in
industrial
environments (equipment monitoring, etc.).
4.3.2 Socketed to the main PCB. This method is well
suited for environments where the end product is not
subjected to shock and vibrations as in consumer
applications (set top boxes, etc.).
4
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