Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
2005 Cermetek Microelectronics, Inc.
Page 4
Document No. 607-0017-01 Revision A (05/05)
Figure 2. Functional Block Diagram of Cermetek CH2165 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.
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 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.
The user may selectively delete any
email message (by message number) or all messages
cached on the POP3 server.
Email and Internet Activity Status.
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.
DESCRIPTION OF FUNCTIONAL BLOCKS AND
DISCUSSION OF BASIC OPERATIONS
Each CH2165 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. V.90
Internal
modem.
5. Modem
interface
circuitry.
6. DAA (Data Access Arrangement) PSTN interface.
7. Additional Flash ROM.
8. Additional
RAM.
SERIAL
INTERFACE
V-24
EIA-232-E or
UART
RST
SPK
+5V
GND
PSTN
MODEM
V.90
MODEM INTERFACE
DAA
CH2165
RXD
RTS
DCD
DSR
RI
CTS
TXD
DTR
TIP
Ring
Flash ROM
32Kx8
Network
Protocol
SMTP
TCP
IP
PPP
POP 3
µP
Flash ROM
2Mx8
RAM
8Mx8
