CH1782A 데이터 시트보기 (PDF) - Cermetek Microelectronics
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CH1782A Datasheet PDF : 19 Pages
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Cermetek Microelectronics, Inc.
Telephone Company Procedures. The goal of the
telephone company is to provide you with the best
service it can. In order to do this, it may occasionally
be necessary for them to make changes in their
equipment, operations or procedures. If theses
changes might affect your service or the operation of
your equipment, the telephone company will give you
notice, in writing, to allow you to make any changes
necessary to maintain uninterrupted service.
In certain circumstances, it may be necessary for the
telephone company to request information from you
concerning the equipment which you have connected
to your telephone line. Upon request of the
telephone company, provide the FCC registration
number and the ringer equivalence number (REN);
both of these items are listed on the equipment label.
The sum of all of the REN’s on your telephone lines
should be less than five in order to assure proper
service from the telephone company. In some cases,
a sum of five may not be useable on given line.
Consult your telephone provider.
If Problems Arise. If any of your telephone
equipment is not operating properly, you should
immediately remove it from your telephone line, as it
may cause harm to the telephone network. If the
telephone company notes a problem, they may
temporarily discontinue service. When practical, they
will notify you in advance of this disconnection. If
advance notice is not feasible, you will be notified as
soon as possible.
When you are notified, you will be given the
opportunity to correct the problem and informed of
your fight to file a complaint with the FCC. Contact
your local telephone service provider if you have nay
questions about your phone line.
In the event repairs are ever needed on the (insert
your product name), they should be performed by
(insert your company name) or an authorized
representative of (insert your company name). For
information contact: (insert your company address).
DIAGNOSTIC TESTS
The CH1782A supports the following tests to help
diagnose the source of data communication problems
that may be encountered.
Analog Loop Test. In an analog loop test, transmitted
characters are looped back to the sending terminal or
computer. This allows verification of the modem’s
analog circuits. These circuits modulate and
demodulate the host’s data. Since the modem uses
different circuits to originate and answer calls, it is
important to test both answer and originate modes.
CH1782A Family of Ultra Small Modem Modules V.22bis-2400bps
An analog loop test, can also be performed. In a self
test, the modem automatically generates characters
back as before. In addition, the modem transmits a
character stream and compares it with the received
character stream for accuracy. This is a more rigorous
test than is possible with the basic analog loop set-up.
Digital Loop Test. In a digital loop test, data that is
received from the remote modem is looped back or re-
sent o the remote modem. This test is performed after
a data connection has been established and after the
local modem is enabled to enter this test mode. To go
back on line and return to the data mode, type
ATO<CR>.
If the remote terminal or computer is having trouble
exchanging data with the local host, the problem is
usually related to either a poor modem-to-modem
connection or incomplete or incompatible
communication settings (parity, data bits, etc.). If a
digital loop test is performed and the remote modem
receives exactly due to incompatible communication
settings.
Remote Digital Loop Test. Once a connection has
been established, this command makes it possible for a
local operator to put the remote modem into Digital
Loop. When this is done, characters sent to the remote
modem are looped back to the local modem.
2002 Cermetek Microelectronics, Inc.
Page 12
Document No. 607-0009 Revision C (01/03)
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