CH2156 View Datasheet(PDF) - Cermetek Microelectronics
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CH2156 Datasheet PDF : 19 Pages
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Figure 6. Schematic Illustrating Implementation of Voice
Injection Feature.
There are two mounting techniques that are recommended for physi-
cally connecting the iModem® to a PCB:
1. Direct soldering
2. Sockets.
Direct Soldering.
The iModem® may be wave soldered onto a circuit card. All iModem®
products are hermetically sealed and will not be harmed by industry
standard wave soldering processes.
Socketing.
The socketing approach to mounting eliminates cleaning and
desoldering concerns. When the socket is used, it must make a
solid connection to all pins. Failure to do so will cause unreliable
or intermittent operation. Also, steps should be taken to assure
that the module remains tightly seated in the socket after the end
product is shipped. Cermetek recommends socket CES-150-01-T-
S by Samtec, 50 pin strip socket.
PHONE LINE CONNECTION GUIDELINES
1. The iModem® must be mounted in the final assembly such
that it is isolated from exposure to any hazardous voltages within
the assembly. Adequate separation and restraint of cables and
cords must be provided.
2. The circuitry from the iModem® to the telephone line interface
must be provided in wiring that carries no other circuitry other
than that specifically allowed in the FCC rules (such as A and
A1 leads).
3. Connection to phone line should be made through an RJ-11C
jack.
4. PCB traces from the modem’s RING and TIP pins to the
RJ-11C jack must be 0.1 inch spacing or greater to one
another and 0.2 inch spacing or greater to all other traces.
The traces should have a nominal width of 0.020 inches or
greater.
5. The RING and TIP PCB traces should be as short as possible
and oriented to prevent coupling other high speed or high fre-
quency signals present on the host circuit PCB.
6. No additional circuitry other than that shown in Figure 7 may
be connected between the modem module and the RJ-11C
Jack. Doing so will invalidate the FCC approval.
7. The iModem®, the RJ-11 Jack, the interfacing circuitry and all
PCB traces in between, must be contained on a PCB with a 94
V-0 flammability rating.
8. The supplied FCC registration label must be applied visibly on
the outside of the product.
9. The product’s User Manual must provide the user with instruc-
tions for connection and use as recommended in the FCC Reg-
istration Section below.
CANADIAN APPROVALS
The iModem® family is approveable for use by DOT to CSA CS-
03 Part I. However, per Canadian procedures, approval can only
be granted after the iModem® has been installed into the end
product. Typically, Canadian approval is obtained by submitting
the final end product to an independent test house or consultant
for evaluation. The test house/consultant then forwards the test
results and applicable documents to the regulatory agency.
Cermetek offers a list of consultants to assist with this process.
iModem® HANDLING AND ASSEMBLY RECOMMENDATIONS
The iModem® contains static-sensitive components and should only
be handled by personnel and in areas that are properly protected
against static discharge.
FCC REGISTRATION
All products in the iModem® family are registered with the FCC
under Part 68. To maintain the validity of the registration, you must
serve notice to the end user of the product of several restrictions
the FCC places on the modem and its use.
In addition to restriction notification, the FCC requires that
Cermetek make all repairs to all products in the iModem® family.
If repairs are necessary after installation of the iModem® and the
end product has been delivered to the end user, the end product
must be returned to the end product supplier where the iModem®
can be removed and then forwarded to Cermetek repair. The
following notice is recommended and should be included in the
end product’s user manual.
FOR YOUR USER’S MANUAL
The part 68 rules require the following (or equivalent) be provided
to the end user of the equipment containing a DAA:
Type of Service: The (insert end product name) is designed to be
used on standard device telephone lines. It connects to the tele-
phone line by means of a standard jack called the USOC RJ-11C (or
USOC RJ45S). Connection to telephone-company-provided coin
service (central office implemented systems) is prohibited. Connec-
tion 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 68,
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 by the FCC within 30 days of their request for the same.
Telephone Company Procedure: The goal of the telephone com-
pany 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 these changes might effect
your service or the operation of your equipment, the telephone com-
pany 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 equip-
ment 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.
© 2000 Cermetek Microelectronics, Inc.
Page 11
Document No. 607-0017 Rev. B (06/00)
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