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參數(shù)資料
| 型號： | CH1798 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 1942K |
| 代理商： | CH1798 |
2000 Cermetek Microelectronics, Inc.
Page 7
Document No. 607-0003 Revision G (05/00)
Table 4. Pin Comparison of CH1786 and HS Modem
Family.
PIN
CH1786
1
RING
2
TIP
3
RXA
4
TXA
5
SPK
6
NC
7
NC
8
SLEEP
9
NC
10
TXD
11
RXD
12
V/D
13
DTR
14
DSR
15
RI
16
CTS (FX only)
17
DCD
18
HS
19
V
cc
20
GND
21
RST
22
NC
HS Modem FAMILY
RING
TIP
T1
NC
SPK
NC
NC
OPEN*
NC
TXD
RXD
OPEN*
DTR
DSR
RI
CTS
DCD
NC*
V
cc
GND
RST
RST
Notes:
1.
*
Indicates a difference between the CH1786 and the
HS Modem. The HS Modem may be directly
substituted for the CH1786 except in applications
where pins 8, 12 or 18 are used.
2. NC signifies Not Connected.
3. Effective 31 March 2000, the HS Modem will no
longer support the HS indication function.
Therefore, pin 18 should be a No Connect in all
applications.
Pause During Dialing.
When placing a call from an office with a telephone
connected to a PBX, it may be necessary to dial an access
code (usually the digit 9) to get an outside line. Inserting a
comma in the telephone number commands the modem to
pause for a specific length of time. The factory default
pause time is 2 seconds.
Example: Dial 9, pause, dial number.
Enter:
ATDT9, T1234567
Multiple commas may be used for a greater delay time.
Touch Tone and Pulse Dialing.
The modem can use DTMF (touch-tones) “T,” or dial pulses
“P” when dialing a telephone number. If the dial command
does not specify which type to use, the modem defaults to
the type last specified. The power-on default value is T.
Example: Pulse dial 9, pause, touch-tone dial number
Enter:
ATDP9, T1234567
Redial Last Number.
Use A/, the repeat command, to redial the last telephone
number dialed when a busy signal is received.
Example: Touch-tone dial 9, pause, dial number, return
for command.
Enter:
ATDP9, T1234567;
higher speed by selection of data compression. In this case,
the maximum DTE to modem speed is 230.4kbps (result
code 20).
Extensions to the basic result code set can be specified by
Register S95, which allows for the use of result codes 40 –
64, 165 - 194.
Note:
Result codes 53 - 64 are supported by the CH1798,
CH1799 and CH2056. Result codes 165 – 194 are only
supported by the CH2056. To obtain a detailed status report
for a given modem communication configuration, use the
AT\V1 command. Executing this command at setup will
cause the modem to connect and return a message on line
consisting of <DTE speed> <modulation> <error protocol>
<line speed of connection>.
LEASED LINE OPTION
The CH1799LL is a leased line version of the CH1799.
Whereas the CH1799 requires an active voltage bearing or
wet PSTN line for normal operations (typically, 48VDC on-
hook line voltage), the CH1799LL is designed to operate over
a non-voltage bearing or dry line.
The CH1799LL will only operate properly on a dry line.
Damage will occur if used on a wet line. The CH1799LL
does not support ring detect but does support off-hook
control. Refer to Cermetek Application Note #116 for
examples and instructions to establish a connection over a
leased dry line wire pair. Note that the length of the leased
line is limited to 20,000 feet. Use PSTN line protection as
recommended in Figure 6B and in Cermetek Application Note
# 126. Follow all applicable requirements for FCC Part 68
compliance. The User is responsible to ensure that FCC Part
68 compliance is maintained.
As an alternative, the CH1799 will operate on a leased line if
the line is made wet by application of a DC voltage. Refer to
Cermetek Application Note #114.
WARNING: Operation of the CH1799LL on a standard
PSTN line will damage the CH1799LL and void its
warranty. Further, operation of the CH1799LL on a dry
line without using proper current limiting circuitry as
outlined in Cermetek Application Note #126 may cause
damage to the CH1799LL and will also void its warranty.
AT COMMAND APPLICATIONS
Dialing A Phone Number.
The Dial command takes the form Dn, where n is a string of
characters. In the simplest form, n will be only the digits of
the phone number to be dialed.
Example: Dial Number.
Enter:
AT D1234567
In response to this command, the HS Modem dials the
telephone number “123-4567” and then waits for a carrier
from the distant modem. If no carrier is detected within a
given time (the default time is 30 seconds), the HS Modem
automatically releases the line and sends a NO CARRIER
result code. If a carrier is detected, the HS Modem gives a
CONNECT result code and goes on-line, permitting
communication with the distant modem.
The Dial Command may also be issued without a telephone
number. ATD causes the modem to pick up the telephone
line without dialing a number.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CH1798ET | MODEM |
| CH1799ET | MODEM |
| CH1799LL | Telecommunication IC |
| CH2056ET | Telecommunication IC |
| CH1804 | Telecommunication IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CH1798ET | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MODEM |
| CH1799 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HIGH SPEED Modem and FAX FAMILY |
| CH1799A | 制造商:Cermetek Microelectronics 功能描述: 制造商:CERMETEK 功能描述: |
| CH1799ET | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MODEM |
| CH1799ETBR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HIGH SPEED Modem and FAX FAMILY |
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