CH2165 Ver la hoja de datos (PDF) - Cermetek Microelectronics

Número de pieza

componentes Descripción

Lista de partido

CH2165

HIGH SPEED INTERNET MODEM FAMILY

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

High Speed Internet Modem Family

Email and Internet Activity Status: CH2124/60. The

CH2124/60 provides activity status messages on the

iModem’s serial port. These status messages consist

of a series of ASCII characters. Some examples are:

BAD MESSAGE NUMBER, CONNECT, HANGING UP,

MESSAGE ACCEPTED, MESSAGE DELETED. For a

more detailed discussion of CH2124/60 status

messages, refer to Cermetek Application Note # 155,

@T® Command Set Description and Usage For

CH2124/60 iModems.

Send Email: CH2165. To send email messages, the

user must explicitly open the TCP socket connection

using the @TCP command. This command

automatically dials the specified local access POP

phone number, performs user authentication,

establishes a PPP connection and obtains an IP

address.

Once connected to the internet, the user may use one

of two methods to send email messages: use pre-

stored messages contained in resident memory or use

streaming messages obtained in real-time from the

CH2165’s DTE serial I/O port. In either case, multiple

email destination addresses are allowed.

For the case of pre-stored messages, each message is

associated with a user defined message name. The

user enters the @TD=msgname command (where

msgname is the message file name) and the CH2165

sends the email using the SMTP protocol.

containing Subject Line and Message Number of all

messages currently cached on the POP3 server. The

user may selectively down load individual messages

(by message number) or may retrieve all messages on

the server. Messages retrieved are provided to the

user on the iModem’s serial port and are not stored in

CH2165 resident memory.

Delete Email: CH2165. The user may selectively

delete any email message (by message number) or all

messages cached on the POP3 server.

Email and Internet Activity Status: CH2165.

Currently, the CH2165 provides two levels of internet

and email status information. Using the @TCS=PPP

command, the user can monitor all the internet PPP

communication. Additionally, the user can determine

internet connectivity status by issuing the @TCS=PING

command. The @TCS=PING command causes the

iModem to send four successive PING commands

directly to the internet host. Responses from the host

include Host IP address and connectivity information.

Back-up and Alternative POP access Phone

Numbers. Cermetek iModem products allow usage of

an alternative local access POP phone number or, if

available, a 1-800 number, should the iModem fail to

connect to the primary POP. The user can establish

the number of attempts made to the primary POP

before the back up POP is attempted.

For the case of streaming email, the user enters the

@TD=0 command (where 0 is a reserved name and

signals the CH2165 that streaming email is desired).

The CH2165 then sends the appropriate SMTP email

headers and prompts the user to supply the body of the

message. The user presents as many ASCII

characters as desired to the CH2165’s DTE serial port.

When finished, the user must end the streaming input

with a <CR>.<CR>. The CH2165 will then terminate

the SMTP message and close the SMTP connection. If

the SMTP inactivity timer limit is exceeded (currently

set at 90 seconds), the CH2165 will automatically

terminate the message and close the SMTP

connection. To end the internet session, the user must

explicitly close the TCP connection and terminate the

PSTN dial-up phone call by entering the @TCT

command.

DESCRIPTION OF FUNCTIONAL BLOCKS AND

DISCUSSION OF BASIC OPERATIONS

Each CH21XX iModem product consists of the following

functional blocks:

1. µP controller with Network Protocols and Flash

ROM.

2. Serial interface buffer.

3. Input/Output interface circuitry.

4. Internal modem (V.90 or V.22bis).

5. Modem interface circuitry.

6. DAA (Data Access Arrangement) PSTN interface.

7. Additional Flash ROM (CH2165 only).

8. Additional RAM (CH2165 only).

Figure 2 contains a schematic drawing illustrating the

interconnectivity of the various functional blocks

comprising the CH21XX iModem products.

When using pre-stored messages in resident memory,

the user is responsible for message memory

management and utilization. Exceeding the memory

limits will cause memory wrap around and messages

may become lost or corrupted.

Retrieve Email: CH2165. The CH2165 will retrieve

email from POP3 servers complying with applicable

internet governing RFCs. By executing the @TES

command, the user may obtain an inventory listing

Each iModem performs the following internet

connectivity functions automatically:

1. Dials local POP and Connects to ISP.

2. Authenticates user ID and logs onto the internet.

3. Sends (or Retrieves) email to (from) the server

address/name specified using the ISP’s SMTP

(POP3) Mail Server.

4. Terminates ISP session after all data is sent (or

retrieved) (CH2124/60 only).

2003 Cermetek Microelectronics, Inc.

Page 5

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

Share Link: