- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385241 > CMX228 ISDN Protocol Engine? D-Channel Data?? PDF資料下載
參數(shù)資料
| 型號： | CMX228 |
| 英文描述： | ISDN Protocol Engine? D-Channel Data?? |
| 中文描述： | 綜合業(yè)務(wù)數(shù)字網(wǎng)協(xié)議引擎？ D信道數(shù)據(jù)？？ |
| 文件頁數(shù)： | 9/38頁 |
| 文件大?。?/td> | 361K |
| 代理商： | CMX228 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當(dāng)前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁
ISDN Data and Telephony Protocol Engine (inc. X.25)
CMX228
1999
Consumer Microcircuits Limited
1999
Chiron Technology Limited
9
D/228/1
1.5
General Description
The CMX228
is a single-chip data processor which has been mask programmed with firmware to
implement an ISDN protocol stack. This enables the CMX228 to provide an analogue (POTS) port
and a digital (RS232) port with an ISDN S-bus network connection. Key variables are stored in an
external EEPROM and the user can provide additional features by adding external ROM and RAM.
Access to the firmware Application Programmer's Interface (API) facilitates the seamless integration of
the user's additional features with the pre-programmed ISDN to POTS and RS232 interfaces.
The CMX228 is intended for use as part of an ISDN chipset and all descriptions in this data sheet refer
to this implementation, which is shown diagrammatically in Figure 3. The use of alternative chipsets is
not supported.
The firmware supports connection to an ISDN S-bus
network interface via the Siemens PSB21525
HDLC controller and the AMD AM79C30 ST controller with integral PCM codec for a single POTS
port.
The CMX228 interfaces with a CMX605 Tone Generator and DTMF Receiver chip, which decodes
incoming DTMF tones and generates call progress signals (eg busy tone) normally originating from an
analogue telephone exchange. The firmware translates the CMX605 data into ISDN D-channel
commands and vice versa to support both incoming and outgoing calls. For the ISDN interface, D-
channel commands sufficient for standard telephony applications are implemented. With the aid of a
small amount of discrete circuitry, exchange battery voltage, ringing current, line reversal and off-hook
detection are also supported, to complete the POTS interface.
The CMX228 also provides a data port which can drive a standard RS232 interface with the aid of a
Maxim MAX238, or similar, level converter. The firmware provides support for incoming and outgoing
data calls, RS232 auto-bauding from 9600bps to 115200bps, auto parity detection, RTS/CTS flow
control, call clearing on loss of DTR, V.120 rate adaption, PPP async to sync conversion, X.25
protocol on both B and D-channels, packet assembly and disassembly for X.25, and a comprehensive
set of Hayes commands (which facilitate the use of normal PC-based modem software). The
CMX228 has dedicated outputs for visible indicators (LEDs) which can be used to provide information
on the call status. Support for Multiple Subscriber Numbering is also included in the firmware.
The CMX228 can be configured either by means of keypad (DTMF) programming via the POTS port
or by means of an extended Hayes command set via the RS232 port. Configuration parameters allow
the user to change (for example) the format and cadence of the ringing signal, so as to facilitate use of
the CMX228 in different countries. Each POTS and RS232 interface is able to configure the variables
relevant to its own use.
An Application Programmer's Interface (API) is available and is described separately in section 1.5.8.
Further details are available on completion of a Non-Disclosure Agreement. Please contact CML
Sales directly for further details.
The firmware and finite state machine embedded in the CMX228 have been used in products which
have gained ETSI CTR3 approval.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CMXT2207 | BJT |
| CN305 | Optoelectronic |
| CN3801 | Analog IC |
| CN3802 | Analog IC |
| CN3803 | Analog IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CMX228S1 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:ISDN Protocol Engine with D - channel Data |
| CMX264 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:Frequency Domain Split Band Scrambler |
| CMX309 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CLOCK OSCILLATORS |
| CMX-309 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMX-309 |
| CMX-309FAB 22.5792MB | 功能描述:OSCILLATOR 22.5792MHZ 3.3V SMT RoHS:否 類別:晶體和振蕩器 >> 振蕩器 系列:CMX-309 標(biāo)準(zhǔn)包裝:1 系列:VG-4512CA 類型:VCXO 頻率:153.6MHz 功能:三態(tài)（輸出啟用） 輸出:LVPECL 電源電壓:3.3V 頻率穩(wěn)定性:- 工作溫度:-40°C ~ 85°C 電流 - 電源（最大）:60mA 額定值:- 安裝類型:表面貼裝 尺寸/尺寸:0.276" L x 0.197" W（7.00mm x 5.00mm） 高度:0.071"（1.80mm） 封裝/外殼:6-SMD，無引線（DFN，LCC） 包裝:Digi-Reel® 電流 - 電源（禁用）（最大）:- 其它名稱:SER3790DKR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。