CH2165 Просмотр технического описания (PDF) - Cermetek Microelectronics

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CH2165

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

High Speed Internet Modem Family

Table 2. Summary of Available @T® Commands By Category for CH2165 (continued).

Command Query

Description

@T[CP][]

@T[CT][]

TCP Management

-----

Establish TCP connection. This command causes the CH2165 to perform the

following tasks in the order listed:

1. Go Off-Hook and dial POP phone number specified @TN=n command.

2. Connect to internet using Login ISP Username specified by @TUI command and

ISP Login Password specified by @TPI command.

3. Obtain IP address and establish TCP socket connection.

-----

Terminate TCP connection. This command causes the CH2165 to perform the

following tasks in the order listed:

1. Close TCP socket connection.

2. Disconnect from the internet.

3. Go On-Hook.

Pins 1 and 2 function as both input and output

connections to the PSTN. To maximize field reliability

in hostile environments, to ensure UL compliance, and

also optionally for FCC part 15 compliance, these two

pins may be routed through an external network such

as that briefly described in figure 3 or as described in

more detail in Cermetek Application Note # 126,

Supplemental PSTN Line Protection.

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.

The circuitry from the iModem to the telephone

interface must be provided in wiring that carries

no other circuitry other than that specifically

allowedin the FCC rules (such as A and A1

leads).

2. Connection to the PSTN line should be made

through an RJ-11C jack.

3. PCB traces from the iModem’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.

4. The RING and TIP PCB traces should be as

short as possible and oriented to prevent

coupling with other high speed or high frequency

signals present on the host circuit PCB.

5. No additional circuitry other than that shown in

Figure 3 may be connected between the iModem

module and the RJ-11C jack. Doing so will

invalidate the conveyed FCC approval.

6. The iModem, the RJ-11C jack, the interfacing

circuitry and all PCB traces must be contained on

a PCB with a 94 V-0 flammability rating.

7. The supplied FCC registration label must be

applied visibly on the outside of the product.

8. The product’s User Manual must provide the user

with instructions for connection and use as

recommended in the FCC Registration Section

below.

CANADIAN APPROVALS

The iModem family is approvable 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.

There are two mounting techniques that are

recommended for physically 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

sealed and will not be harmed by industry standard

wave soldering processes.

2003 Cermetek Microelectronics, Inc.

Page 10

Document No. 607-0017 Revision H2 (11/03)

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