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CH1786 Schematic ( PDF Datasheet ) - ETC

Teilenummer CH1786
Beschreibung CH1786 Family of Ultra Small 2400bps Modems
Hersteller ETC
Logo ETC Logo 




Gesamt 18 Seiten
CH1786 Datasheet, Funktion
CH1786 Family of Ultra Small 2400bps Modems
INTRODUCTION
The CH1786 family of modems are a full function,
FCC Part 68 approved 2400bps modem. These
modems provide a fast, easy and flexible way to
integrate a modem into any OEM product while
utilizing the minimum amount of PCB space (1.01 ”x
1.27 ”x 0.52 ”). The CH1786 family only requires two
external interfaces: a CCITT V.24 serial interface that
can be routed directly to a UART, and a Tip and Ring
interface which goes directly to an RJ-11 jack for the
PSTN line connection. The CH1786 can be
controlled with industry standard AT commands and,
hence, is compatible with available industry
communication software.
All CH1786 modems support asynchronous operation
at 2400bps, 1200bps, and 300bps to both Bell and
CCITT standards. The resident PSTN line interface,
or Data Access Arrangement (DAA), while being FCC
approved, is also Canadian DOT approvable and can
be approved in other countries that require 1500VAC
RMS isolation requirements per UL 1950 Edition 3.
The CH1786 family of modems operate off a single 5-
volt supply. The low power operation and automatic
standby mode make these modems ideally suited for
portable equipment. In addition, their small physical
size affords maximum flexibility in equipment design.
FEATURES
Supports Standards
212,and Bell 103
CCITT
V.22bis,V.22,Bell
FCC Part 68 approved and DOT CSA CS-03 Part I
approvable
UL 1950 and CSA C22.2 950 Listed
UL File Number: E104957
AT Command structure with extensions
1500 VAC RMS isolation barrier minimum, 2122V
peak surge protection minimum
Single 5 volt operation
Low power operation with automatic reduced power
standby mode
Automatic adaptive and fixed compromise
equalization
Size: 1.01 ”x 1.27 ”x 0.52 ”(nominal)
NVRAM allows storage of custom configurations
and telephone numbers
CH1786 FAMILY
CH1786
NVRAM, Voice/ Inject,
Operating Temperature:
0°C to +70°C
Hermetic,
CH1786ET
NVRAM, Voice/ Inject, Hermetic,
Operating Temperature:
-40°C to +85°C
CH1786NH
Non-Hermetic, Operating
Temperature:
0°C to +70°C
Figure 1. Functional Block Diagram of CH1786.
The CH1786 comes with FCC Part 68 approval and is
shipped from the factory with an FCC Part 68 label
indicating the registration number and ringer
equivalent. This label should be prominently
displayed on the end product.
Figure 2. Voice/ Data Port Control
2003 Cermetek Microelectronics, Inc.
Page 1
Document No. 607-0004 Revision L1 (06/03)






CH1786 Datasheet, Funktion
Cermetek Microelectronics, Inc.
CH1786 Family of Ultra Small 2400bps Modems
Figure 5. CH1786 Application Diagram
2003 Cermetek Microelectronics, Inc.
Page 6
Document No. 607-0004 Revision L1 (06/03)

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CH1786 pdf, datenblatt
Cermetek Microelectronics, Inc.
prohibited. Connection to party lines service is
subject to state tariffs.
Changes in Attestation Procedure for Plugs and
Jacks. (Name of applicant) attests that the network
interface plugs or jacks used on this equipment
comply with and will continue to comply with the
mechanical requirements specified in Part 58, sub-
part F, specifically the dimensions, tolerances and
metallic plating requirements. The compliance of
these connectors will be assured by purchase
specifications and incoming inspection.
Documentation of such specifications and/ or
inspections will be provided to the FCC within 30
days of their request for the same.
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 right to file a complaint with the FCC. Contact
your local telephone service provider if you have nay
questions about your phone line.
CH1786 Family of Ultra Small 2400bps Modems
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).
DEFAULT STATUS, PERFORMANCE, AND
SPECIFICATIONS
The following is a summary of the Default
Configuration Profile installed by Cermetek
Microelectronics, Incorporated, prior to delivery
of the CH1786.
Async mode selected
2400bps
Bell 212A operation at 1200bps
Even parity
Auto answer enabled (Disabled on CH1786NH)
Command echo ON
All result codes enabled –extended
Wait for dial tone before dialing =2 seconds
Detects busy signal
Full word result codes
Pulse dial make/break ratio =39/61
DSR enabled
Modem enabled DTR (Disabled on CH1786NH)
DCD enabled (Disabled on CH1786NH)
Speaker enabled but off when receiving carrier
Speaker volume set to medium
Local modem will grant RDL request from remote
modem
Guard tones disabled
Minimum DTR pulse width =0.1 seconds
Ring count =01 (CH1786)
Escape code character =43
Carriage return character =13
Line feed character =10
Back space character =08
Duration of wait for dial tone =02 seconds
Duration of wait for carrier after dialing =30 seconds
Duration of dial pulse (comma)=02 seconds
Carrier detect response time =0.1 seconds
Escape code guard time =1 second
Length of use after comma =2.0 seconds
Last carrier to hang up delay =0.1 seconds
DTMF interdigit delay =0.1 seconds
DTMF Attenuation =-4dB
Sleep mode inactivity time =5 seconds
Long space disconnect disabled
2003 Cermetek Microelectronics, Inc.
Page 12
Document No. 607-0004 Revision L1 (06/03)

12 Page





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