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參數(shù)資料
| 型號： | CMX208 |
| 英文描述： | ISDN Dual Telephony Protocol Engine?? |
| 中文描述： | 綜合業(yè)務(wù)數(shù)字網(wǎng)電話協(xié)議雙引擎？？ |
| 文件頁數(shù)： | 9/25頁 |
| 文件大?。?/td> | 335K |
| 代理商： | CMX208 |
ISDN Dual Telephony Protocol Engine
CMX208
1999
Consumer Microcircuits Limited
1999
Chiron Technology Limited
9
D/208/1
1.5
General Description
The CMX208
is a single-chip data processor which has been mask programmed with firmware to
implement an ISDN protocol stack. This enables the CMX208 to provide two analogue (POTS) ports
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 interfaces.
The CMX208 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 AMD AM79C30 ST
controller with integral PCM codec for a single POTS port. An auxiliary Motorola MC145480 PCM
codec will need to be added for the second POTS port.
The CMX208 interfaces with up to two CMX605 Tone Generator and DTMF Receiver chips, which
decode incoming DTMF tones and generate 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 CMX208 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 CMX208 can be configured by means of keypad programming via either POTS 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 CMX208 in different countries. Each POTS 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 1.5.6.
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 CMX208 have been used in products which
have gained ETSI CTR3 approval.
相關(guān)PDF資料 |
PDF描述 |
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| CMX218 | ISDN Data and Telephony-Protocol Engine??? |
| CMX228 | ISDN Protocol Engine? D-Channel Data?? |
| CMXT2207 | BJT |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CMX208S1 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:ISDN Dual Telephony Protocol Engine |
| CMX20T | 制造商:APart 功能描述: |
| CMX218 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:ISDN Data/Telephony Protocol Engine |
| CMX218S1 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:ISDN Data/Telephony Protocol Engine |
| CMX228 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ISDN Protocol Engine? D-Channel Data?? |
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