參數(shù)資料
型號(hào)： SI2400URT-EVB
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 15/94頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR SI2400 ISOMODEM
標(biāo)準(zhǔn)包裝： 1
系列： ISOmodem®
主要目的： 電信，調(diào)制解調(diào)器
嵌入式： 否
已用 IC / 零件： SI2400
主要屬性： 雙路 RJ-11 連接至電話線路，音頻連接器
次要屬性： RS-232，TTL 串行和 USB 接口
已供物品： 板，調(diào)制解調(diào)器，電源
相關(guān)產(chǎn)品： SI2400-BS-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
SI2400-FS-ND - IC ISOMODEM SYST-SIDE DAA 16SOIC
336-1093-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
其它名稱： 336-1166
Si2400
22
Rev. 1.3
mode, which is similar to the current-limiting mode but
has reduced hookswitch drive. This feature allows the
Si2400 to remain off-hook on a digital line for a longer
period of time without damage. If the Si2400 does not
detect overcurrent after the time set by S32 (OCDT), the
correct line termination is applied. Another option is
setting S13[5] (OFHE) = 1b. When this bit is set, the
Si3015 is forced to CTR21 termination during the short
period of time from the off-hook event until the timeout
defined by OCDT. After the OCDT timeout, the desired
dc termination is restored.
If it is determined that a false overcurrent condition has
been
detected,
the
host
may
choose
to
set
S62[6] (OCR) = 1b to disable the reporting of the “x”
result code.
5.9. Caller ID Decoding Operation
The Si2400 supports full caller ID detection and decode
for US Bellcore, UK, and Japanese standards. To use
the caller ID decoding feature, the following set-up is
necessary:
1. Set SE0[3] (ND)
= 0b (Set modem to 8N1 configuration)
2. Set S13[1] (CIDU)
=1b (Set modem to Bellcore type caller
ID) or S13[2] (CIDB)
= 1b (Set modem to UK type caller
ID) or S13[7] (JID)
= 1b (Set modem to Japanese type
caller ID)
5.9.1. Bellcore Caller ID Operation
The Si2400 will detect the first ring burst signal and
echo an “R” to the host. The device will then start
searching for the caller ID preamble sequence after the
appropriate time-out. When 50 continuous mark bits
have been detected, the “m” response will be echoed to
indicate that the mark has been detected and that caller
ID data will follow.
At this point the algorithm will look for the first start bit,
assemble the characters and transmit them out of the
serial port as they are detected.
Finally, the Si2400 will continue detecting ring bursts
and echoing “R” for each burst and will automatically
answer after the correct number of rings set by S00
(NR).
5.9.2. UK Caller ID Operation
When the Si2400 detects a line reversal, it will echo an
“f” to the host. It will then start searching for the Idle
State Tone Alert Signal. When this signal has been
detected, the Si2400 will transmit an “a” to the host.
After the Idle State Tone Alert Signal is completed, the
Si2400 will apply the wetting pulse for the required
15 ms by quickly going off hook and on hook. From this
point on, the algorithm is identical to that of Bellcore in
that it will search for the channel seizure signal and the
marks before echoing an “m” and will then report the
decoded caller ID data. The wetting pulse may cause
false intrusions to be detected. To prevent this, setting
S14[7] (MRCD) = 1b is recommended.
5.9.3. Japan Caller ID Operation
After a polarity reversal and the first ring burst are
detected, the Si2400 is taken off hook. The Si2400 then
looks for mark bits. If three seconds elapse without
detecting a mark bit, the Si2400 hangs up and echoes
an “H”. Otherwise, after 40 1s (marks) have been
detected, the Si2400 will search for a start bit, echo an
“m” for mark, and begin assembling characters and
transmitting them out through the serial port. When the
carrier is lost, the Si2400 immediately hangs up and
echoes “N”.
5.9.4. Force Caller ID Monitor
The Si2400 may be used to continuously monitor the
phone line for the caller ID mark signals. This can be
useful in systems that require detection of caller ID data
before the ring signal, voice mail indicator signals, and
Type II caller ID monitor support. To force the Si2400
into caller ID monitor mode, set SOC[6:5] (CIDM) = 11b.
In addition, the Force Caller ID Monitor feature can
require that the caller ID FSK data be preceded by
either a DTMF A or D or a channel seizure pattern by
setting CIDM appropriately.
Note: CIDM should be disabled before going off-hook.
5.9.5. DTMF Caller ID
In order for the Si2400 to detect DTMF-based caller ID,
it must be put into the data mode for DTMF detection.
This mode behaves similarly to the ATA0 and ATDT!0
modes in that once a command is sent, ATO must be
sent to return to the detection state. The following
commands place the Si2400 into an on-hook DTMF
detection mode:
ATS1D=02SF0=02SE8=02SE6=01S83=66O<CR>
The Si2400 cannot distinguish between DTMF sent
from the central office or DTMF sent from a parallel
phone. For this reason, the host processor will need to
know the proper format of the caller ID information to
interpret whether the incoming digits are caller ID
information or if they are the outgoing digits of a parallel
phone. DTMF-based caller ID typically uses the
extended DTMF digits (A, B, C, D, *, #) to indicate the
start and end of the caller ID data.
While in this mode, the Si2400 will not report detection
of ringing and must rely on the caller ID string as an
indication that the phone is ringing. It is necessary to
end the DTMF detection mode by sending the ATH
command before originating (ATDT) or answering (ATA)
a call.
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